INSTALLATION INSTRUCTIONS

CONTENTS

The table of contents lists various sections including General Information, Installation, Start Up, Service, and detailed figures and tables. Specific sections cover:

• Wall Mount General Information (Nomenclature, Shipping Damage, General)
• Duct Work, Filters, Fresh Air Intake
• Installation Planning, Wall Construction, Outdoor Area, Condensate Drainage, Indoor Airflow
• Ducted and Free Blow Applications, Thermostat Placement
• Unit Installation, Materials/Tools List, Wall Preparation, Wall Mount Installation
• Wiring (Main Power, Low Voltage), Low Voltage Connections, Unit Shutdown, Balanced Climate, Dehumidification, Ventilation, Low Ambient Control, Thermostat/Freeze Protection, Alarm Relay, DDC Controls, Dirty Filter Switch Indicator, Discharge Air Sensor, Airflow Switch, Compressor Current Sensor
• Start Up Procedures (General, Charge, Safety, High Pressure Switch, Three Phase Compressor, Phase Monitor, Condenser Fan Operation)
• Service Hints, Sequence of Operation, Balanced Climate Mode
• Compressor Control Module (CCM) Features (Delay-on-Make, Short Cycle Protection, Low/High Pressure Detection, Test Mode, Brownout Protection), Pressure Service Ports
• Troubleshooting (ECM Motors, Communication Diagnostics), Fan Blade Setting, Refrigerant Charge, Fan Shroud Removal
• Unit Airflow and Blower Speeds, Dirty Filter Switch Adjustment

GETTING OTHER INFORMATION AND PUBLICATIONS

This section lists publications that can assist with installation, including standards from ANSI/NFPA, ACCA Manual J Residential, and ACCA Manual D. Contact information for ACCA, ANSI, ASHRAE, and NFPA is provided.

WALL MOUNT GENERAL INFORMATION

AIR CONDITIONER WALL MOUNT MODEL NOMENCLATURE

The model nomenclature is a code that defines the unit's specifications. It includes fields for Series, Capacity, Revision, Specialty Products, Volts & Phase, Control Modules, Coil Options, Placeholder, Color Options, Filter Options, and Ventilation Options. For example, the structure is W [Series] [Capacity] [Hand] [Revision] [Specialty Products] [Volts & Phase] [KW] [Control Modules] [Coil Options] [Placeholder] [Color Options] [Filter Options] [Ventilation Options].

Shipping Damage

Upon receipt, check the carton for external shipping damage. If damage is found, contact the carrier immediately in writing to request an inspection.

General

This equipment is intended for installation by trained, experienced technicians. It is not intended for use by persons with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless supervised. Children should be supervised to ensure they do not play with the appliance. The refrigerant system is fully assembled and charged, and all internal wiring is complete.

The unit is designed for use with or without ductwork. Flanges are provided for attaching supply and return ducts. These instructions detail the recommended installation method and electrical wiring. Always read all accompanying instructions and tags on the equipment. Adhere to national and local codes, consulting authorities having jurisdiction. Unit sizing should be based on heat loss calculations per ACCA methods, and ductwork should follow ACCA guidelines.

Duct Work

Supply and return ductwork must be properly sized for the design airflow requirement, using ACCA as a guide. Ductwork outside the conditioned space requires insulation (minimum 1" with vapor barrier) to conserve energy and prevent condensation. Flexible joints are recommended to minimize noise transmission. Specific clearance requirements apply to supply ducts attached to the outlet air frame for W30 and W36 models (1/4" to combustible material for the first 3'). Ducts through walls must be insulated and sealed. For installations without a return air duct, a metallic return air grille with louvers spaced no larger than 5/8" is required. Bard Return Air Grille Kits are recommended. If using a filter grille, ensure filters allow a maximum velocity of 400 fpm. Note: Installation codes may limit cabinets without return air ducts to single-story structures.

Filters

A standard 1" throwaway filter is included and accessible from the outside. Optional 1" and 2" filters are available. Internal filter brackets can be adjusted for 2" filters.

Fresh Air Intake

Units have fresh air inlet slots on the service door. If equipped with a fresh air damper assembly, it is shipped attached and locked closed. Stops must be installed for proper damper operation. Graphs on pages 41-42 show approximate fresh air amounts based on damper position. For maximum energy efficiency, the fresh air blank-off plate is recommended and should be installed in place of the damper.

INSTALLATION

Basic Installation Design and Application Planning

Proper planning and site inspection are crucial. Ensure all service and airflow clearances are met and the unit complies with codes and regulations. Inspect both interior and exterior of the structure.

Wall Construction

Verify the wall can support the unit's weight. Review construction codes, including seismic requirements. Wood frame walls must be strong and rigid; mounting lags and brackets should attach to structural members. Concrete block, brick, and metal buildings require thorough inspection for structural integrity. Corrugated siding may need trimming and flashing; heavy corrugations might require a metal plate. Ensure the unit area is weatherized and sealed to prevent air/water infiltration.

Outdoor Area Inspection

Inspect the jobsite or plans for obstructions that could hinder unit operation or serviceability. Avoid enclosed areas that limit ambient airflow. Ensure outdoor ambient temperature air can enter side intake condenser openings. Portable or modular buildings must allow constant outdoor air supply. Service panels must be accessible. Inspect wall surfaces for obstructions like conduits, junction boxes, drains, vents, windows, doors, overhangs, and posts.

Condensate Water Drainage

Follow codes for condensate drainage. A clear, flexible PVC drain hose (3/4" ID, 1" OD) extends from the drain pan to below the unit base. Water expelled during cooling can freeze if the unit operates in freezing outdoor temperatures. If connected to a drain system, it must be open or vented.

Indoor Ducted and Non-Ducted Applications

Proper air distribution is key for consistent temperature. Poor distribution can lead to uneven temperatures or discomfort. Thermostat/sensor placement also impacts climate control. For supply air, ensure non-restrictive paths from grilles/registers. For non-ducted applications, use a supply louver grille with adjustable deflectors. For return air, ensure a non-restrictive path and keep at least 2' clear space around return grilles/registers.

Ducted Applications

Field-fabricated ductwork can be installed inside. Stub ducts can connect to unit flanges. Ductwork must be properly sized per ACCA. Unheated spaces require insulation (min. 1" with vapor barrier). Flexible joints minimize noise. Specific clearances apply to supply ducts for W30/W36 models (1/4" to combustible materials for the first 3'). Ducts through walls need insulation and sealing. For free blow applications, a non-restrictive metallic supply air grille with deflectors is required. For non-ducted applications, a metallic return air grille with louvers spaced no more than 5/8" is required. Bard Return Air Grille Kits are recommended. If using a return air filter grille, ensure filters allow max. 400 fpm velocity. Filtered return grilles do not filter ventilation air. Install return grilles with louvers pointing downward.

[WARNING] Fire hazard. Maintain minimum 1/4" clearance between the supply air duct and combustible materials in the first 3' of ducting. Failure to do so could result in fire causing damage, injury or death.

Thermostat or Indoor Temperature Sensor Placement

Proper placement is crucial for unit operation. Avoid direct sunlight or drafts from doorways. Use insulating material around wire entry points. Measure return air temperature, not supply air temperature, for optimal performance. Placing the sensor near a return air opening is recommended.

Unit Installation

Ensure proper tools are on-site. Follow provided steps for correct unit installation and long service life.

Materials/Tools List

A list of required tools and materials is provided, including safety gear, drill bits, screwdrivers, tape measure, level, caulk, utility knife, cutting tools, electrical components, multimeter, fasteners, and duct sealing materials.

Wall Preparation

1. Cut two holes for supply and return air openings, ensuring they are square and level. Follow all clearance and manual instructions.
2. Review electrical requirements and plan conduit routing and thermostat placement.
3. Install ductwork and prepare openings.
4. Clean the exterior wall to ensure a smooth, level, debris-free surface. Remove all construction debris from hole cutting.

Wall Mount Installation to Wall Surface

1. Inspect the unit for damage after unpacking. Remove the shipping top rain flashing. The top rain flashing prevents water entry behind the unit. A bottom mounting bracket is provided but optional. Review unit labels and serial plate for requirements.
2. Mark bolt hole locations and bottom bracket position. Install the optional bottom bracket securely to the wall, ensuring it is level and correctly positioned for support.
3. Position the unit against the wall. Install the top rain flashing by hooking the hem bend into the rear bend of the unit top.
4. Apply liberal caulk to side wall mount brackets and the back of the top rain flashing. Place the unit flush against the wall. Ensure the unit is level for proper condensate drainage. The optional bottom bracket can aid support.
5. Secure the unit using field-supplied fasteners through the built-in wall mounting brackets. The installer is responsible for selecting appropriate fasteners based on wall construction and codes. Typical fasteners include 5/16" fasteners with 7/8" flat washers. Ensure fasteners attach to structural members.
6. Apply caulk between the unit top and the front surface of the top rain flashing.
7. Connect unit ductwork from inside the building, following all clearances and instructions. For rigidity, duct frames/collars can be secured to the structural wall. Seal ductwork to the unit using approved tape or sealing materials.
8. For side-by-side installations, maintain 20" clearance on the right side (W**A units) or left side (W**L units) for access and airflow. Additional clearance may be required by local codes.

TABLE 1: Clearance Required for Service Access and Adequate Condenser Airflow

NOTE: For side-by-side installation of two W**A models, 20" clearance is needed between units. This can be reduced to 15" by using a W**L model on the left and a W**A model on the right.

TABLE 2: Minimum Clearances Required to Combustible Materials

FIGURE 2: Unit Dimensions

This figure provides a table of unit dimensions (Width, Depth, Height) and specific opening dimensions (A through T) for various models (W18*B, W24*B, W30*B, W36*B). It also includes diagrams of the W**A (Right Unit) and W**L (Left Unit) showing various components, openings, and mounting points. All dimensions are in inches and are not to scale.

FIGURE 3A: Mounting Instructions (W18AB, W18LB, W24AB, W24LB)

This figure illustrates mounting instructions for specific models. It shows a side view of the unit mounted to a wall, detailing the supply and return air openings, heater access panel, and the location of the rain flashing and foam air seal. A detailed view of the wall opening and hole locations is provided, along with notes recommending silicone caulking behind side mounting flanges and under top flashing. It also specifies that the W**A unit is shown, and W**L unit controls/heater access are on the opposite side.

FIGURE 3B: Mounting Instructions (W30AB, W30LB, W36AB, W36LB)

Similar to Figure 3A, this figure provides mounting instructions for W30 and W36 models. It includes required dimensions for maintaining 1/4" clearance from combustible materials for the supply air duct and recommended 1" clearance from combustible materials. It also shows the wall opening and hole location view, side view, and notes regarding caulking and unit configuration.

FIGURE 4: Electric Heat Clearance

This figure illustrates the required 1/4" minimum clearance between the supply air duct and combustible surfaces for W30AB, W30LB, W36AB, W36LB models when electric heat is installed. A [WARNING] highlights the fire hazard associated with insufficient clearance.

FIGURE 5: Wall Mounting Instructions

This figure shows wall mounting instructions for concrete block wall installation and wood frame wall installation. It depicts the supply and return air openings and the placement of the unit relative to the wall structure, including the factory-supplied rain flashing and the bottom mounting bracket.

FIGURE 6: Wall Mounting Instructions

This figure provides a more detailed view of wall mounting, showing clearances around the supply and return ducts (1.000" clearance) and the framing material required for wood frame walls. It indicates attachment points to the top and bottom plates of the wall and notes the need for structural members matching stud spacing.

FIGURE 7: Common Wall Mounting Installations

This figure illustrates four common wall mounting scenarios:

• Non-Ducted Installations: Unit sealed to wall, with adjustable supply grille and fixed blade return grille.
• Ducted Installations: Unit sealed to wall, with supply air duct, optional dropped ceiling, and fixed blade return grille.
• Outdoor Wall Curb Installations: Unit sealed to a wall curb, with adjustable supply grille and fixed blade return grille.
• WAPR11 Indoor Sound Plenum Installations: Unit sealed to the wall curb, with supply air duct and WAPR11 plenum over the return air opening.

Each scenario describes how conditioned air is supplied and returned, and the benefits of wall curbs (sound isolation, area reduction) and plenums (sound isolation, reduction).

Wiring – Main Power

[WARNING] Electrical shock hazard. Ensure proper earth ground and disconnect power before servicing. Main power must be clean and reliable, with voltage consistent and within specified ranges. Measure voltage at the field power connection point while the unit operates at full load. For field-supplied transformers, ground the center leg if high resistance grounding is used. Refer to the unit rating plate for wire sizing and fuse/breaker size. Use copper conductors only. Follow NEC and local codes for wiring and protection. The unit rating plate specifies the Maximum Time Delay Relay Fuse or circuit breaker. The disconnect access door can be locked for security.

Wiring – Low Voltage

Equipment uses dual primary voltage transformers. Factory wiring is on 240V tap; reconnect to 208V tap for 208V operation. Acceptable voltage ranges are provided. For low voltage wiring, an 18-gauge copper, color-coded cable is recommended. The units use a 24-volt AC low voltage circuit. Terminal descriptions (C, G, Y1, Y2, B/W1, W2, A, D, L) and their functions are detailed, including alarm relay contacts (1, 2, 3).

TABLE 3: Additional Low Voltage Connections (if applicable)

Unit Shutdown Feature (Standard on All Models)

The RT terminal (24VAC transformer output) and R terminal (24VAC hot) can be connected via a jumper bar. Removing this jumper and connecting to an external NC contact (e.g., fire/smoke detector) will cause equipment shutdown.

Balanced Climate™ Feature (Standard on All Models)

This mode reduces indoor airflow and extends run time to enhance comfort and humidity extraction during cooling. Y1 is for Balanced Climate cooling, Y2 for standard cooling. A jumper connects Y1 and Y2; removing it enables Balanced Climate. Units with economizers do not have this jumper. A 2-stage cooling thermostat is recommended. If cooling is not met, the thermostat signals Y2 to increase blower speed. Refer to page 22 for details. Units with mechanical dehumidification require an additional connection.

Dehumidification Feature (Optional)

The D terminal (24VAC input) activates a 3-way valve solenoid for reheat coil operation during cooling, allowing humidity removal without significant sensible cooling. Indoor blower speed is reduced. A humidity sensing thermostat or humidistat is required.

Ventilation Features (Optional)

Refer to provided ventilation instructions for low voltage wiring.

Low Ambient Control (LAC)

This pressure switch monitors high side pressure and operates as outdoor temperatures drop below 60°F. It cycles the condenser fan to maintain desired liquid pressure or slows it down. An outdoor temperature switch disables Balanced Climate mode below 50°F to prevent evaporator freeze-up. For units with mechanical dehumidification, this switch must remain disconnected when Balanced Climate is not used.

Outdoor Temperature Switch and Freeze Protection Thermostat

These components are supplied with LAC kits. The outdoor switch disables Balanced Climate below 50°F. The freeze thermostat cuts out compressor operation if the evaporator begins to freeze.

Alarm Relay Feature (Controls Option)

Provides normally open (NO) and normally closed (NC) contacts that activate when the compressor control module locks out operation due to high or low refrigerant pressure.

DDC Controls Feature (Controls Option)

Provides additional sensors for use with field-supplied advanced logic controllers. Components include Dirty Filter Switch Indicator (DFS), Discharge Air Sensor, Airflow Switch, and Compressor Current Sensor.

TABLE 4: Low Voltage Connections for DDC Control

TABLE 5: Wall Thermostats

TABLE 6: Thermostat Wire Size

TABLE 7: Humidity Controls

TABLE 8: CO2 Controllers

FIGURE 8: Programmable Thermostat Connections

This figure shows wiring diagrams for connecting various thermostats (Completestat, Bard #8403-060) and optional accessories like CO2 controllers and humidistats to the unit's low voltage terminal strip. It details connections for common (COM), fan (G), cooling stages (Y1, Y2), heating stages (W1/E, W2, W3), ventilation (A), dehumidification (D), alarm (L), and 24VAC power (R, RT).

FIGURE 9: Thermostat Connections

This figure provides detailed wiring diagrams for different thermostat models (T4 Pro, T6 Pro) and units with dehumidification or mechanical humidistats. It illustrates connections to the unit's low voltage terminal strip, including optional CO2 controller connections. Notes provide specific instructions for various configurations, such as jumper settings for Balanced Climate mode and electric heat.

START UP

NOTICE

These units require R-410A refrigerant and polyol ester oil.

General

Use separate service equipment for R-410A. Use recovery equipment rated for R-410A. Use manifold gauges rated for R-410A (800 psi/250 psi low). R-410A is a blend of HFC-32 and HFC-125, nearly azeotropic, and requires liquid refrigerant charging. It operates at 40-70% higher pressure than R-22. R-410A has zero ozone depletion potential but has global warming potential. R-410A compressors use polyol ester oil, which is hygroscopic and absorbs moisture. A liquid line dryer is essential. Limit atmospheric exposure to 15 minutes. Plug compressors immediately after removal and purge with nitrogen.

Topping Off System Charge

If a leak occurs, Bard recommends reclaiming, evacuating, and recharging to the nameplate charge. For R-410A, refrigerant composition changes are minimal with multiple leaks. The remaining charge can be used, topping off with pressure charts as a guideline.

REMEMBER

When adding R-410A refrigerant, it must come out of the charging cylinder as a liquid to avoid fractionation and ensure optimal performance.

Safety Practices

1. Never mix R-410A with other refrigerants.
2. Use gloves and safety glasses; polyol ester oils can irritate skin, and liquid refrigerant can cause frostbite.
3. Never use air and R-410A for leak checking; it can be flammable.
4. Do not inhale R-410A vapor, as it can cause dizziness, loss of coordination, and potentially death.
5. Do not burn R-410A; decomposition produces hazardous vapors. Evacuate the area if exposed.
6. Use only cylinders rated DOT4BA/4BW 400.
7. Never fill cylinders over 80% capacity.
8. Store cylinders in a cool area, out of direct sunlight.
9. Never heat cylinders above 125°F.
10. Never trap liquid R-410A in manifold sets, gauge lines, or cylinders, as expansion can cause bursting.

Important Installer Note

Wash the indoor coil with dishwashing detergent for improved start-up performance.

High Pressure Switch

Models are supplied with a remote reset for high/low pressure switches. Tripped switches can be reset by cycling the thermostat off/on. High pressure switch settings: Opens 650 ± 15 PSI, Closes 520 ± 15 PSI.

Three Phase Scroll Compressor Start Up Information

Scroll compressors operate in one direction. Phase reversal can cause reverse rotation, leading to elevated sound levels and reduced current draw. Verify proper rotation by observing suction pressure drops and discharge pressure rises. Correct phasing immediately to avoid bearing damage from oil pump-out. If the compressor runs in reverse for over an hour, its internal protector will trip. Reversing any two line connections changes rotation direction.

Phase Monitor

Units with three-phase scroll compressors have a phase monitor to prevent damage from phase reversal. A green LED indicates correct phasing when a Y signal is present; a red fault LED indicates reversed phases and inhibits compressor operation. If a fault occurs, reverse two supply leads to the unit.

Condenser Fan Operation

Models with a Low Ambient Control (LAC) may have a delayed condenser fan start until system pressure builds. Fan motor cycling may vary with ambient conditions. 50 Hz models must have the fan wired on low speed.

Service Hints

1. Advise owners to maintain clean air filters and avoid closing registers, which reduces airflow and equipment life.
2. Check power fuses or circuit breakers for correct rating.
3. Periodically clean the outdoor coil for unrestricted airflow.

Sequence of Operation

When the thermostat calls for cooling (R-Y1), the compressor and outdoor motor start. The G circuit (indoor motor) is completed by the thermostat or manual fan switch. For heating, R-W1 starts the heat contactor and blower. R-W2 engages second-stage heat if equipped.

Balanced Climate™ Mode

This mode enhances comfort by reducing indoor airflow and extending run time for better humidity removal. It can be applied under normal circumstances. For environments with a 72°F cooling setpoint, removing the Y1/Y2 jumper and using a 2-stage thermostat increases humidity removal up to 35%. If operating below 60°F outdoor conditions, a LAC kit is required to prevent evaporator freeze-up. LAC kits also include an evaporator freeze protection thermostat. Ventilation packages require a LAC kit to prevent coil freeze-up. Balanced Climate is suitable for duct-free and ducted applications with limited static pressure (0.20" ESP).

Vent Connection Plug

A vent connection plug is located on the side of the control panel for ventilation packages. If the compressor does not start, check if the optional vent or jumper plug is in place, as the unit will not operate without one.

Compressor Control Module (CCM)

The CCM is standard on all models and includes features like Delay-on-Make Timer, Short Cycle Protection/Delay-on-Break, Low Pressure Detection, High Pressure Detection, LPC/HPC Status LEDs, Test Mode, and Brownout Protection with Adjustment.

Delay-on-Make Timer

A 2-minute delay (plus 10% of delay-on-break) prevents multiple units from starting simultaneously after a power loss. Adjust delay-on-break timers on each unit for staggered starts.

Short Cycle Protection/Delay-on-Break

An anti-short cycle timer (adjustable 30 seconds to 5 minutes) prevents compressor short-cycling. A new call is initiated only after the time period expires.

Low Pressure Detection

Monitors low pressure switch. If open for over 2 minutes, the CCM de-energizes the compressor. If the switch closes, the compressor restarts. If it trips again during the same call, the alarm terminal is energized, and a blue LED lights. Operation resumes after power reset or loss of voltage at Y terminal.

High Pressure Detection

Monitors high pressure switch. If open, the CCM de-energizes the compressor. If it closes, the compressor restarts after the delay-on-break setting. If it trips again during the same call, the alarm terminal is energized, and a red LED lights. Operation resumes after power reset or loss of voltage at Y terminal.

Test Mode

Test mode is activated by rapidly rotating the potentiometer (POT) clockwise (see Figure 10). Specific POT rotation conditions must be met. Normal operation resumes after power reset or 5 minutes in test mode.

Brownout Protection with Adjustment

Protects against voltage drops during compressor start-up. DIP switches can delay brownout signaling for 1, 5, or 10 seconds. If voltage recovers during the delay, the compressor starts. A blue flashing light indicates a brownout condition. If the 'do not ignore' position is selected with inadequate power, the compressor may not start. This feature also handles rapid transfer switches that might cause temporary reverse rotation.

Pressure Service Ports

Units have high and low pressure service ports. Use the correct pressure table (pages 28-29) for the model number. The unit uses high-flow Coremax valves; do NOT use a Schrader valve core removal tool. A special tool is available at www.fastestinc.com/en/SCCA07H for Coremax valve replacement.

SERVICE

Troubleshooting NIDEC SELECTECH Series ECM Motors

If the Motor Is Running

Motor rocking back and forth on start-up is normal. If the system is noisy, does not change speeds, or has other symptoms, check:

• Wait for programmed delays.
• Verify motor control inputs are wired correctly per the factory diagram.
• Remove filters and check for open dampers, registers, and grilles. If this resolves the issue, clean/replace the filter. Clean the blower wheel/coil if necessary.
• Check external static pressure against the unit serial plate. Additional ductwork may be needed if pressure is too high.
• If the motor does not shut off, wait for programmed delays (max 90 seconds) and check for a "Continuous Fan" call on the G terminal.
• If problems persist, confirm voltage checks and proceed to communication diagnostics.

If the Motor Is Not Running

Check for proper high voltage and ground at the L/L1, G, N/L2 connections (see Figure 11). The SelecTech motor is voltage-specific. Ensure correct voltage is applied (±10% of nominal).

Model SelecTech Communication Diagnostics

The SelecTech motor communicates via 24 VAC low voltage wiring. Confirm connections and voltage per the unit wiring diagram (see Figure 12). Initiate a demand from the thermostat and check voltage between common and the appropriate motor terminal (1-5). If low voltage communication is absent, check thermostat demand and output wiring. If high voltage is present but the motor fails to operate, the motor may be faulty and require replacement.

Fan Blade Setting Dimensions

Figure 13 shows the correct fan blade setting for proper airflow across the outdoor coil. Refer to Table 9 for specific dimensions. Adjust blade position as needed during service work.

R-410A Refrigerant Charge

The unit is factory charged per the serial plate. AHRI ratings are based on this charge. Pressure tables (pages 28-29) provide nominal pressures for evaluation by certified technicians. Do not use these tables to adjust charge; if in doubt, reclaim, evacuate, and recharge to the serial plate value.

Removal of Fan Shroud

Steps include disconnecting power, removing grilles and shroud screws, unwiring the motor, sliding out the assembly, and reversing steps for reinstallation.

TABLE 10: Cooling Pressure – Standard Airflow

This table provides low side and high side pressure readings for various models (W18A/L, W24A/L, W30A/L, W36A/L) at different return air temperatures (75/62, 80/67, 85/72) and outdoor coil temperatures (75°F to 131°F). Low side pressure is ± 4 PSIG, high side is ± 10 PSIG. Tables are based on rated CFM. If charge is uncertain, evacuate and recharge to serial plate weight. Note: Pressure tables are based on high speed condenser fan operation.

TABLE 11: Cooling Pressure – Balanced Climate Airflow

Similar to Table 10, this table provides pressure readings for Balanced Climate airflow conditions. It covers the same models and temperature ranges. Low side pressure is ± 4 PSIG, high side is ± 10 PSIG. Tables are based on Balanced Climate CFM. If charge is uncertain, evacuate and recharge to serial plate weight. Note: Pressure tables are based on high speed condenser fan operation.

TABLE 12: Electrical Specifications – W**AB Series

This table details electrical requirements for W**AB series models, including Rated Volts & Phase, No. Field Power Circuits, Minimum Circuit Ampacity, Maximum External Fuse or Circuit Breaker, Field Power Wire Size, and Ground Wire Size for Single and Multiple Circuit configurations. It includes important notes on conductor derating and Maximum Overcurrent Protection (MOCP).

TABLE 13: Electrical Specifications – W**LB Series

This table details electrical requirements for W**LB series models, similar to Table 12, covering Rated Volts & Phase, No. Field Power Circuits, Minimum Circuit Ampacity, Maximum External Fuse or Circuit Breaker, Field Power Wire Size, and Ground Wire Size for Single and Multiple Circuit configurations. It includes important notes on conductor derating and Maximum Overcurrent Protection (MOCP).

Setting Unit Airflow

Units are factory set to a default speed. Three selectable cooling speed taps can be used for higher duct static applications or increased sensible cooling. To change speed taps, move the orange/black wire on the blower speed terminal block to MED or HI. Refer to Table 16 for airflow per tap. Adjust system static or blower speed to maintain minimum airflows, especially with Balanced Climate mode activated. Do not operate in Balanced Climate mode with high static applications. Balanced Climate mode runs continuously unless ventilation, electric heat, or 2nd stage cooling is called for, at which point it activates a higher speed tap.

Blower Speeds

Five factory programmed speed taps (torque settings) are available, selected via 24VAC signals from the low voltage terminal block. Each tap is programmed to different motor torque settings (see Figure 14). Multiple speed taps can be energized simultaneously, with the highest number taking priority. Table 15 details blower speeds for various operational modes. Speed Taps are defined as: Tap 1 (Vent/Blower Only), Tap 2 (Balanced Climate), Tap 3 (Default LO Cooling & Heating), Tap 4 (Optional MED Cooling & Heating), and Tap 5 (Optional HI Cooling & Heating).

TABLE 15: Blower Speeds for Unit Operational Modes

Note 1: Fan speed is selectable via the blower speed control terminal block. LO (default), MED or HI speeds can be used.

Note 2: Dehumidification operation is disabled during heating or cooling calls. Unit runs at Balanced Climate speed during dehumidification.

FIGURE 15: Speed Taps

This figure shows the blower speed selection terminal block with the orange/black wire indicating speed settings (LO, MED, HI). Speed Taps 1 and 3 use identical torque settings. Tap 1 is for Vent/Blower Only and is the lowest priority. Tap 2 is for Balanced Climate and requires removing the Y1/Y2 jumper. Tap 3 is the default LO speed. Taps 4 (MED) and 5 (HI) are optional and selected by moving the orange/black wire. Tap 4 can be overridden by Tap 5.

Dirty Filter Switch

To adjust the dirty filter switch, disconnect power, remove covers, and locate the switch. Ensure the knob is set at 0.4" W.C. as a starting point, but adjust based on filter type, blower speed, and ducting. Apply power, turn on the indoor blower, and restrict the filter with cardboard until the switch trips and the indicator light illuminates. If adjustment is needed, disconnect power, remove panels, and turn the knob clockwise to increase restriction or counter-clockwise to decrease it. Repeat steps until desired restriction is achieved. Remove restriction and reset the switch.

FIGURE 16: Dirty Filter Switch Location

This figure shows the location of the dirty filter switch and indicator light on both W**LB and W**AB units.

FIGURE 17: Adjusting Dirty Filter Switch

This figure illustrates the adjustment knob for the dirty filter switch, indicating that turning clockwise increases the required restriction amount to activate the switch, and counter-clockwise decreases it.

TABLE 16: Indoor Blower Performance

This table provides indoor blower performance data (CFM) for various models (W18AB/W18LB, W24AB/W24LB, W30AB/W30LB, W36AB/W36LB) across different ESP (External Static Pressure) values (0.00" to 0.50") and blower speed settings (Balanced Climate, Default LO, Optional MED, Optional HI). It lists Dry Coil and Wet Coil CFM values.

TABLE 17: Maximum ESP of Operation - Electric Heat Only

This table lists the maximum External Static Pressure (ESP) of operation for electric heat-only configurations for W18A/L, W24A/L, W30A/L, and W36A/L models, categorized by outlet speed (FRONT Single, High, Low) and model variants (e.g., -A0Z, -B06). It notes that values are for units with standard 1" filters and suggests derating ESP by 0.15" for 2" pleated filters.

TABLE 18: Electric Heat

This table provides electric heat specifications (KW, Amps, BTUH) for various voltage configurations (240V-1, 208V-1, 240V-3, 208V-3, 460V-3) and heat capacities (6, 8, 9, 10, 15 KW).

TABLE 19: Vent and Control Options

This table lists various optional accessories and control features available for W18, W24, W30, and W36 models. Options include Outdoor Temperature Device (ODT), Start Kits, Dirty Filter Sensor Kits, Alarm Relays, Crankcase Heaters, Low Ambient Controls (LAC), DDC controls, Blank Off Plates (BOP), Fresh Air Dampers (FAD), Commercial Ventilators (CRV), Economizers (ECON), and Energy Recovery Ventilators (ERV). Each option is listed with its part number and description, indicating availability (X) for specific model series.

TABLE 20A: Optional Accessories – Right Hand

This table details optional accessories, primarily Heater Kits and Circuit Breakers/Pull Disconnects, available for the Right Hand models (W18AB-A through W36AB-C, RC). An 'X' indicates availability for a specific model.

TABLE 20B: Optional Accessories – Left Hand

This table details optional accessories, primarily Heater Kits and Circuit Breakers/Pull Disconnects, available for the Left Hand models (W18LB-A through W36LB-C, RC). An 'X' indicates availability for a specific model.

GRAPHS 1-4: Ventilation Delivery

These graphs illustrate ventilation delivery (CFM) versus Damper Pin Position for different duct static conditions (.20 Duct Static, .40 Duct Static) and supply/return grilles. Graph 1 is for W18*B FAD-NE2, 3 W/O Exhaust, Graph 2 for W24*B FAD-NE2, 3 W/O Exhaust, Graph 3 for W30*B FAD-NE2, 3 W/O Exhaust, and Graph 4 for W36*B FAD-NE2, 3 W/O Exhaust.