SPECTRACOOL AIR CONDITIONER N21 MODEL INSTRUCTION MANUAL

WARRANTY AND RETURN POLICY

For warranty and return information, please visit: https://hoffman.nvent.com/en/hoffman/warranty-information#

RECEIVING THE AIR CONDITIONER

Inspect the air conditioner upon receipt for any concealed damage that may have occurred during shipment, such as dents, scratches, or loose assemblies. Note any damage on the freight bill and bring it to the attention of the delivering carrier within 15 days of delivery. Save the carton and packing material for inspection and file a claim with the carrier. nVent Equipment Protection cannot accept responsibility for freight damages but will assist in any way possible.

HANDLING AND TESTING THE AIR CONDITIONER

CAUTION: Do not operate the air conditioner while it is horizontal or on its side, back, or front. The lubricating oil in the refrigeration compressor can cause permanent damage and void the warranty.

If the air conditioner has been in a horizontal position, ensure it is placed in an upright, vertical mounting position for a minimum of five (5) minutes before operating.

TEST FOR FUNCTIONALITY BEFORE MOUNTING THE AIR CONDITIONER TO THE ENCLOSURE.

Connect the power cord to a properly grounded power supply, ensuring the minimum circuit ampacity is at least 125% of the amperage shown in the design data section for the appropriate model. Do not connect other equipment to this circuit to prevent overloading.

Operate the air conditioner for five (5) to ten (10) minutes. There should be no excessive noise or vibration. The condenser blower (ambient air), evaporator blower (enclosure air), and compressor should be running. Condenser air temperatures should become warmer than normal room temperatures within a few minutes.

The compressor has automatic reset thermal overload protection. This switch stops compressor operation if the compressor overheats due to a clogged air filter, ambient temperatures exceeding the nameplate rating, or enclosure heat loads exceeding the unit's capacity. The blowers will continue to operate, and the compressor will restart after cooling.

INSTALLATION INSTRUCTIONS

1. Inspect the air conditioner and verify correct functionality before mounting.
2. Determine if the unit is to be surface or recess mounted. Prepare the enclosure opening using the appropriate cutout dimensions.
3. Install gaskets to the air conditioner using the provided gasket kit.
4. Mount the air conditioner on the enclosure using the provided 1/4-20 x 0.625 mounting bolts. Torque each bolt to 65 in./lbs. Allow the unit to remain upright for a minimum of five (5) minutes before starting. Caution! Air conditioner must be in an upright position during operation.
5. Start bolts by hand before tightening with a wrench or ratchet driver to avoid cross-threading.
6. When routing the drain tube, ensure it is not kinked and maintains a continuous downward slope to prevent condensate overflow.
7. Refer to the nameplate for electrical requirements and connect the power cord to a properly grounded power supply. Use of an extension cord is not recommended. The electrical circuit should be fused with a slow-blow fuse or HACR circuit breaker.

DESIGN DATA

Note: -XXX will be replaced with a three-digit number designating desired options. Consult the factory for specific model numbers.

DIMENSIONAL DRAWINGS

115/230 VOLT

Dimensional drawings for the 115/230 Volt models are provided, illustrating overall dimensions, air inlet/outlet locations, condensate evaporator location, filter access, mounting holes, and drain connection.

460 VOLT

Dimensional drawings for the 460 Volt models are provided, illustrating overall dimensions, air inlet/outlet locations, condensate evaporator location, filter access, mounting holes, and drain connection.

CUTOUT INSTRUCTION (As viewed from outside of enclosure)

Note: Dashed lines represent air conditioner.

COMPONENTS LIST

WIRE DIAGRAMS

Detailed wire diagrams are provided for the Mechanical Thermostat Unit (115/230V and 460V) and the Remote Digital Controller Unit (115/230V and 460V).

MECHANICAL THERMOSTAT UNIT, 115/230V

A wiring schematic illustrating the connections for the mechanical thermostat unit on 115/230V systems.

MECHANICAL THERMOSTAT UNIT, 460V

A wiring schematic illustrating the connections for the mechanical thermostat unit on 460V systems.

MECHANICAL THERMOSTAT UNIT

An electrical schematic showing the components and their interconnections for the mechanical thermostat unit.

WIRE DIAGRAMS - REMOTE DIGITAL CONTROLLER UNIT, 115/230V

A wiring schematic for the remote digital controller unit on 115/230V systems.

REMOTE DIGITAL CONTROLLER UNIT, 460V

A wiring schematic for the remote digital controller unit on 460V systems.

TEMPERATURE CONTROL FOR MECHANICAL THERMOSTAT UNIT

Note: For Remote Digital Controller Unit, refer to the instruction manual included with the Remote Digital Controller Box.

The electromechanical thermostat is factory preset to 75°F / 23°C. To change the temperature setting, remove the nylon plug from the front face and use a standard screwdriver. Turn clockwise for cooler temperatures and counterclockwise for warmer temperatures. The setpoint differential is 6°F.

UNITS WITH HEAT

GENERAL INFORMATION

Air conditioners with electric heat have two thermostats: one for cooling and one for heating. They are factory set for cooling at 80°F / 27°C and heating at 55°F / 13°C, unless otherwise noted. The thermostats have a 10°F differential between on/off functions. Setpoint variance is ±3°F below 100°F and ±4°F at 100°F.

EXAMPLE

With a cooling dial setting of 80°F, cooling operates on at 90±3°F and off at 80±3°F. With a heating dial setting of 55°F, heating operates on at 55±3°F and off at 65±3°F.

TO CHANGE THE TEMPERATURE SETTING OF THE THERMOSTAT

Remove the nylon plug covering the adjustment screw. Use a standard screwdriver to turn the screw clockwise for cooler settings or counterclockwise for warmer settings. Reinstall the nylon plugs.

DIAL RANGES

The cooling thermostat dial range is 70°F to 100°F. The heating thermostat dial range is 55°F to 65°F. Stop screws limit these ranges. Removing cooling stop screws may cause limited cooling due to evaporator coil icing. Removing heating stop screws may cause frequent cycling between heating and cooling.

TESTING THERMOSTAT CALIBRATION

Cooling Thermostat

With the unit powered and the cooling thermostat set to the lowest position (stop screw removed), measure the intake air temperature on the evaporator side. Turn the cooling thermostat dial counterclockwise at 1°F per second until the compressor stops, noting the dial reading. The readings must be within ±3°F of each other.

Heating Thermostat

With the unit powered and the heating thermostat set to the lowest position (stop screw removed), measure the intake air temperature on the evaporator side. Turn the heating thermostat dial counterclockwise at 1°F per second until the heater starts (indicated by a change in unit amps), noting the dial reading. The readings must be within ±3°F of each other.

PRINCIPLES OF OPERATION

If electrical power is interrupted and reapplied within 3 to 5 seconds, the compressor may not restart due to high back pressure. It takes approximately one minute after shutdown for compressor pressures to equalize for a restart.

Operating the air conditioner outside the minimum or maximum ambient temperatures indicated on the nameplate voids all warranties. Refer to the warranty section for parameters of restricted operation.

Continuous moisture flow from the drain tube indicates ambient air entering the enclosure. Frequent opening of the enclosure door admits humid air, increasing dehumidification load.

Units with an optional malfunction switch have normally open connections between red & yellow wires and normally closed between red & blue wires. During an alarm, red & yellow wires close, and red & blue wires open. Maximum electrical ratings for the switch are 13A for 120 VAC and 10A for 240 VAC.

MAINTENANCE

COMPRESSOR

The compressor requires no maintenance as it is hermetically sealed and factory lubricated. Recharging ports are provided for qualified professionals to check pressures or recharge the system if refrigerant charge is lost. CAUTION: Never loosen, remove, or tamper with access fitting covers. Breaking seals on compressor access fittings during the warranty period will void the warranty on the hermetic system.

INLET AIR FILTER

Proper maintenance of the inlet air filter ensures normal operation. Neglecting filter maintenance reduces the maximum operating ambient temperatures. A dirty or clogged filter can cause the compressor's operating temperature to increase, leading to thermal overload cutout switch activation and compressor shutdown. The compressor will restart automatically after cooling. It is recommended to intentionally interrupt power if the unit shuts down due to high compressor temperature, as this indicates a clogged filter or condenser coil, reducing cooling airflow. Do not run the unit for extended periods without the filter, as dust and lint can clog the condenser coil fins. Continued operation under these conditions can damage the compressor and shorten its life. The inlet filter is easily removable for cleaning or replacement.

HOW TO REMOVE, CLEAN OR INSTALL A NEW INLET AIR FILTER

RP aluminum washable air filters offer excellent filtering efficiency and dust holding capacity with minimal airflow resistance. They are lightweight and easy to service. Recoat filters after washing with RP Super Filter Coat adhesive for optimum performance. Clean air filters regularly.

The inlet air filter is located behind the front cover. Pull the ring protruding from the slot in the side of the front cover to access the filter.

Cleaning Instructions:

1. Flush the filter with warm water from the exhaust side to the intake side. DO NOT USE CAUSTICS.
2. Allow the filter to drain completely, placing it corner down.
3. Recoat the filters with RP Super Filter Coat adhesive, spraying from both sides for maximum concentration.

CONDENSER AND EVAPORATOR AIR MOVERS

Fan and impeller motors require no maintenance as all bearings and shafts are lubricated for life during manufacturing.

CAUTION: Operation in areas with airborne caustics or chemicals can rapidly deteriorate filters, condenser coils, blowers, and motors. Contact nVent Equipment Protection for special recommendations.

REFRIGERANT LOSS

Each air conditioner is factory tested for refrigerant leaks. Shipping damage or microscopic leaks may require repair or recharging by qualified professionals. Refer to the nameplate for refrigerant type and charge size. Ensure there are no leaks and the system is properly evacuated into a deep vacuum before recharging.

TROUBLE SHOOTING

BASIC AIR CONDITIONING TROUBLE SHOOTING CHECK LIST

1. Check the manufacturer's nameplate for correct power supply.
2. Turn on power. The evaporator fan should start. Check for airflow. If no airflow, possible issues include an open motor winding, stuck fan motor, or obstructed blades. Repair or replace the defective part.
3. Check thermostat setting and adjust to the lowest setting. The condenser fan and compressor should turn on. If not, the thermostat may be defective.
4. Verify both fans and the compressor are running. If not, the unit will not cool properly.
5. Check the condenser fan for airflow. If no airflow, possible issues include a defective thermostat, open motor winding, stuck impeller motor, or obstructed wheel. Repair or replace the defective part.
6. Check the compressor for operation (slight vibration, warm outer case). If the compressor is not operating correctly, possible issues include a defective thermostat, capacitor, overload switch, or relay. Repair or replace the defective part.
7. Ensure coils are clean. Check evaporator "air in" and "air out" temperatures. If temperatures are the same, possible causes include refrigerant loss or bad compressor valves. Repair or replace the defective part.
8. To check for a bad thermostat, turn off power, remove the control box cover, and connect both thermostat wires to one terminal (replace cover for safety). Turn power on. If both fans and the compressor operate, the thermostat needs replacement.

SYMPTOMS AND POSSIBLE CAUSES:

For additional technical information (e.g., amp draw, pressures, temperatures), contact nVent Equipment Protection at 800-896-2665.

F-GAS INFORMATION