Munters A40G Desiccant Dehumidification Equipment Submittal
Project Overview
This document details the submittal for Munters Desiccant Dehumidification Equipment for the Pacific Coliseum project. It includes equipment data, specifications, sequence of operation, installation instructions, and fan selection data.
Project Name: Pacific Coliseum
Munters Job Number: 807938, -1, -2, -3
Model Number: A40G
Date: May 10, 2007
Contacts
- Munters Sales Representative: Art Doramajian @ 514-920-0021
- Factory Project Coordinator: Mike Nelson @ 210-249-3847
- Munters Service / Start-up Scheduling: 800-229-8557
Munters Corporation
Commercial Dehumidification Division
16900 Jordan
Selma, TX 78154
(210) 651-5018
Unit Supplied Equipment
Munters units are factory tested for proper operation, performance, and quality, adhering to National Electric Code, Uniform Plumbing Code, and other relevant standards. They are designed for year-round indoor installation.
Key Components:
- Vestibule Arrangement: Includes modulating fresh air and return air dampers.
- Cassette Equipment: Features minihelic pressure gauges and an 86" x 400mm Titanium Silica Gel HoneyCombe Wheel.
- Reactivation Equipment: Includes a factory-balanced backward airfoil direct drive plug fan with a premium efficiency TEFC motor, a direct fire burner with automatic ignition and modulating gas valve, gas regulator, and temperature controls.
- Coil and Condensing Unit Equipment: Includes a Chilled Water Coil ARI Certified.
- Supply Fan Equipment: Features an adjustable motor platform, backward airfoil belt drive fan with premium efficiency TEFC motor, and isolation spring mounting.
- Unit Structure: Double wall construction with insulation, hinged service doors, lifting lugs, and louvered panels.
- Control Cabinet Equipment: Includes humidistat(s), filter monitor gauge(s), and terminal strip for remote controller.
Equipment Data Sheet (Model A40G)
| Parameter | Value |
|---|---|
| Manufacturer | MUNTERS DH |
| Model Number | A40G |
| Outside Ambient (DB / GR-LB) | 52/57 |
| Supply Airflow (SCFM) | 20,000 |
| Make Up Air Volume (SCFM) | 0-20,000 |
| Supply Fan Size | 33" SWSI |
| Supply Fan Type/Class | BAF / II |
| Supply Fan Air Volume (SCFM) | 20,000 |
| Supply Fan Total Static Pressure (WG") | 4.95 |
| Supply Fan External Static Pressure (WG") | 1.50 |
| Supply Fan RPM | 1496 |
| Supply Fan Motor HP | 30 |
| Reactivation Fan Size | 18"x90" |
| Reactivation Fan Type/Class | BAF / II |
| Reactivation Fan Air Volume (SCFM) | 6,050 |
| Reactivation Fan Total Static Pressure (WG") | 5.78 |
| Reactivation Fan External Static Pressure (WG") | 1.00 |
| Reactivation Fan RPM | 3450 |
| Reactivation Fan Motor HP | 15 |
| Reactivation Heater Type of Gas | NATURAL |
| Reactivation Heater Capacity Input | 1,500,000 MAX BTUH |
| Reactivation Heater Stages of Capacity | MODULATING |
| Reactivation Heater Gas Supply Pressure Required | 6-15" WG |
| Reactivation Heater Gas Pressure at Pilot | 3.5" WG |
| Reactivation Heater Pressure Drop Across Burner | 1.5" WG |
| Desiccant Wheel Moisture Removal (LB / HR) | 642 |
| Desiccant Wheel Water Removal Efficiency (BTU/LB) | 2,440 |
| Desiccant Wheel Heat Transfer Efficiency (BTU/LB) | 1,581 |
| Desiccant Wheel Pressure Drop Process (WG") | 1.96 |
| Desiccant Wheel Pressure Drop Reactivation (WG") | 2.52 |
| Post Cooling Coil Fluid Type | WATER |
| Post Cooling Coil Total Capacity (BTUH) | 1,038,000 |
| Post Cooling Coil Sensible Capacity (MBH) | 1,038,000 |
| Post Cooling Coil Rows/FPI | 1 / 8/10 |
| Post Cooling Coil Face Area (SQ. FT.) | 44.4 |
| Post Cooling Coil Entering Air (DB / GR-LB) | 99/7 |
| Post Cooling Coil Leaving Air (DB / GR-LB) | 51/7 |
| Post Cooling Coil Total Conditioned Air (SCFM) | 20,000 |
| Post Cooling Coil Air Pressure Drop ("WG) | 0.60 |
| Post Cooling Coil Fluid Entering / Leaving Temp | 45/55 |
| Post Cooling Coil Pipe Connection Size (IN) | 3 |
| Post Cooling Coil Weight-Dry (LBS) | 1,018.0 |
| Post Cooling Coil Weight-Wet (LBS) | 1,463.0 |
| Post Cooling Coil Fluid PD (FT-H20) | 10.03 |
| Post Cooling Coil GPM | 207 |
| Post Cooling Coil CV | 99 |
| Filters Type | 30% PLEATED DISPOSABLE |
| System Voltage (V/P/H) | 460/3/60 |
| Control Circuit Voltage | 120 V |
| Supply Motor Amps | 33.8 |
| Reactivation Motor Amps | 17 |
| Control Transformer Amps | 2.2 |
| Unit FLA | 53.0 |
| Unit MCA | 61.5 |
| Unit MOP | 95 |
| Disconnect Size | 80 |
Flow Diagram Description
The diagram illustrates the air flow through the Munters A40G unit. Outdoor air and return air are drawn in (labeled D and E respectively). They pass through filters and then the desiccant wheel (labeled C). Reactivation air is heated by a direct fire burner (labeled B) and passes through the desiccant wheel to regenerate it. The processed air then goes through a post-cooling coil (labeled H) and is supplied to the space via the supply fan (labeled F). The reactivation air, after passing through the wheel, is exhausted.
Summer Conditions (Example Data):
| Stage | A (Outside Air) | B (Reactivation Burner Inlet) | C (Desiccant Wheel Inlet) | D (Desiccant Wheel Outlet) | E (Return Air) | F (Supply Fan Inlet) | G (Post Coil Inlet) | H (Supply Fan Outlet) |
|---|---|---|---|---|---|---|---|---|
| SCFM | 6050 | 6050 | 6050 | 20000 | 0 | 20000 | 20000 | 20000 |
| DEGREES F | 52 | 275 | 120 | 52 | 52 | 99 | 51 | 51 |
| GR/LB | 57 | 95 | 262 | 57 | 57 | 7 | 7 | 7 |
Engineering Guide Specifications
General
Munters DH units are to be furnished and installed as approved equals, meeting specified sizes, arrangements, capacities, and performance. They are factory preassembled, tested, and shipped complete, designed for year-round indoor installation. Units are ETL listed and manufactured in ISO9001 certified plants.
The system maintains humidity levels via staged control of the Honeycombe Dehumidifier. Reactivation energy is supplied by a direct-fired gas burner, modulated for energy conservation.
Construction Specification - Base
The unit base is constructed of all-steel bolted construction with formed 12-gauge galvanized steel channel perimeter and cross members. It uses G 90 galvanized materials and includes steel lifting lugs. Welding on the base is not permitted.
Floor Panels
Floor panels are double-wall construction with no heat conductors. They are sandwich construction with heavy gauge galvanized sheet metal and insulated with 2 inches of urethane foam (R-14 insulation value).
Cabinet
The unit housing is double-wall panel in frame construction with no heat conductors. Panels are sandwich construction with heavy gauge galvalume steel exterior and galvanized steel interior, insulated with 2 inches of urethane foam (R-14). Service doors are also insulated sandwich construction with compression latches and resilient gaskets.
Dehumidifier & Control Components
The dehumidifier is a non-cyclic sorption type with a single desiccant rotary structure, designed for continuous operation and counter-flow of process and reactivation air. The rotary structure uses 100% inert silicates or non-crystalline silicon dioxide (silica gel) for water transfer.
The system includes a HoneyCombe desiccant wheel, drive system, direct fire reactivation heater, fans for process and reactivation air, airflow gauges, inlet filters, and control systems for overheat and rotation faults.
Fans
Units are equipped with supply and reactivation air fans rated per AMCA standard 210. Supply fans are single-width, single-inlet with backward airfoil blades and belt drive. Reactivation fans are single-width, single-inlet with backward airfoil blades and direct drive. Motors are TEFC NEMA Design B with Class F insulation and a 1.25 service factor.
Filters
Process and return air plenums have galvanized steel racks for filter removal. Filters are 2 inches thick, pleated disposable type with 25%-30% average efficiency.
Direct Fire Reactivation
A direct fire gas burner provides reactivation heat with an input capacity of 1,500,000 BTUH. The burner produces no measurable carbon monoxide. The system is designed to meet ANSI requirements and features automated control modulating heat for energy conservation.
Dampers and Louvers
Return air dampers are heavy gauge galvanized steel with opposed blade type and motorized actuators. Louvers for outside air intake of reactivation air are integral to the unit housing.
Water Coils
Water coils are sized for full capacity, constructed with 5/8 inch O.D. seamless copper tubes mechanically expanded to aluminum fins. Assemblies include 16 gauge galvanized steel casings, support mounting for coil removal, and a 20 gauge stainless steel drain pan. Coils are rated for 300 PSIG maximum working pressure.
Electrical
The main electrical control panel has an integral non-fused disconnect and is protected from water entry. All controls are UL listed and wired per the National Electrical Code. A single point power connection is provided.
Sequence of Operation
The Munters unit operates as an environmental control system for unique facilities like ice rinks. In Auto mode, the supply fan energizes based on a humidistat signal. If humidity exceeds the set point, the Honeycombe dehumidifier is energized.
The dehumidifier draws air through the desiccant wheel, removing moisture. The reactivation air fan and heater then dry the desiccant wheel using heated air from the direct-fired burner. The process is continuous, with the dehumidifier de-energizing when humidity returns to the set point. A post-cooling coil maintains desired supply air temperature.
Desiccant Wheel Timer (2TR)
A Time Delay Relay (2TR) is programmed for "Accumulative Delay on Make Interval" mode. When the supply fan accumulates 240 minutes of run time, the timer activates the reactivation fan, DH wheel, and gas heater to ensure complete wheel drying.
Dimensional Drawing Description
The preliminary drawing shows the physical layout and dimensions of the A40G unit. Key features include:
- Side 'B': Makeup Air Inlet & Damper (95 7/8" width)
- Side 'B': Return Air Inlet & Damper (59 1/4" width)
- Side 'C': Filters, DH Wheel, Reactivation Fan, Post Cool Coil, Supply Fan.
- Side 'D': Top Supply Outlet.
- Electrical Can is located on Side 'D'.
- Condensate Drain connections are on both sides.
Rigging Instructions
The rigging diagram illustrates the proper method for lifting the unit.
- Caution: Lift only using supplied lifting lugs.
- The crane and rigging must be capable of handling the unit's weight (11,080 LBS ±10%).
- Spreader bars (2" to 4" wider than unit) must be used to prevent rigging cables from squeezing the top of the unit.
- The unit must be rigged using all 8 lifting lugs (4 per side) to prevent damage.
- The unit must remain level during lifting.
Fan Selection Data - Reactivation Fan (Mechanovent MVP)
This section provides performance data for the reactivation fan.
| Parameter | Value |
|---|---|
| Product | Backward Inclined Wheel for Unhoused SWSI Apps |
| Size/Model | 18 Std Airfoil, 90.0% Width |
| Arrangement | [not specified] |
| Drive type | Direct |
| AMCA Performance Class | 3 |
| Volume Flow Rate | 6,050 CFM |
| Fan Static Pressure | 10.5 in wg |
| Fan Speed | 3500 rpm |
| Fan Input Power | 14.4 bhp |
| Operating Temperature | 120 Deg F |
| Density at Altitude (0 ft) | 0.0685 lb/ft³ |
| Static Efficiency | 69.38% |
| Maximum Operating Temperature | 120 Deg F |
| Maximum Safe Operating Speed | 3752 rpm |
| Sound Power Level Ratings (dB) | See table for octave bands (63-8000 Hz) |
| Estimated Sound Pressure Levels (dBA) | Inlet: 62.7-89.2, Outlet: 61.7-95.7 |
The fan curve shows Fan Static Pressure (in wg) on the Y-axis versus Volume Flow Rate (CFM) on the X-axis. A second Y-axis shows Fan Input Power (bhp). The curves indicate the operating characteristics of the fan, with a peak static pressure around 6000 CFM.
Fan Selection Data - Supply Fan (Mechanovent MVP)
This section provides performance data for the supply fan.
| Parameter | Value |
|---|---|
| Product | Backward Inclined Wheel for Plenum Apps |
| Size/Model | 333 Std Airfoil, 100% Width |
| Arrangement | [not specified] |
| Drive type | Belt |
| AMCA Performance Class | 3 |
| Volume Flow Rate | 20,000 CFM |
| Fan Static Pressure | 4.95 in wg |
| Fan Speed | 1496 rpm |
| Fan Input Power | 23.4 bhp |
| Operating Temperature | 70 Deg F |
| Density at Altitude (0 ft) | 0.0750 lb/ft³ |
| Static Efficiency | 66.55% |
| Maximum Operating Temperature | 70 Deg F |
| Maximum Safe Operating Speed | 2080 rpm |
| Sound Power Level Ratings (dB) | See table for octave bands (63-8000 Hz) |
| Estimated Sound Pressure Levels (dBA) | Inlet: 54.4-79.4, Outlet: 55.4-90.1 |
The fan curve displays Fan Static Pressure (in wg) on the Y-axis against Volume Flow Rate (CFM) on the X-axis. A secondary Y-axis shows Fan Input Power (bhp). The curves illustrate the fan's performance, with a peak static pressure occurring at approximately 15,000 CFM.
Heatcraft Coils Fluid Selection (Post Cool Coil)
This section details the specifications for the post-cooling coil.
| Parameter | Value |
|---|---|
| Customer | Pacific Coliseum |
| Model Number | 5WD1008B |
| Air Velocity | 450.3 Sft/min |
| Total Capacity | 1,038 MBH |
| Sens. Capacity | 1,038 MBH |
| Lvg. Air DB | 51.12 °F |
| Lvg. Air WB | .00 °F |
| Standard APD | .60 "H2O |
| Lvg. Fluid Temp | 55.00 °F |
| Fluid Flow | 207.0 gal/min |
| Fluid PD | 10.03 FT H2O |
| Fluid Vel. | 2.17 ft/s |
| Conn Size | (1) 3.00 IN |
| Weight (Dry) | 1,018 lbm |
| Weight (w/Fluid) | 1,463 lbm |
| Casing Material | Galvanized |
| Connection Material | Copper |
| Connection Type | Sweat |
| Vent/Drain | .50 FPT on Face |
| Notes | ARI Certified And Rated In Accordance With ARI 410. Header Pressure Drop Exceeds 30% of Total Fluid Pressure Drop. |
General Installation Instructions
Location of the Unit
The unit must be set on a flat, level surface, supported around its perimeter, with proper service clearances on all four sides (Front: 72", Ends: 42", Back: 36").
Noise Considerations
For noise-sensitive areas, units should be placed away from occupied spaces. For curb-mounted units, duct openings should be sealed with acoustical sealant. Supply and return ducts should be lined with 1" minimum acoustical duct liner. Isolation curbs are recommended for roofs susceptible to vibration.
Indoor Installation
Units should be placed away from acoustically sensitive areas. Noise-sensitive installations should incorporate vibration isolation.
Lifting Unit
Lift the unit using all lifting lugs with a crane capable of handling the unit's weight. Use spreader bars (2"-4" wider than unit) to prevent rigging cables from squeezing the top. Ensure the unit is set properly over the curb.
Storage of Unit
Store the unit on a flat surface. It cannot support its weight on an uneven surface.
Utility Connections
Electrical: The unit has a single point electrical hookup with an integral non-fused disconnect. Electrical service must accommodate the unit's MCA and be protected against short circuit and ground fault. Service enters from underneath through a prefabricated hole or through the base rail for slab mounts.
Control Sensors
Temperature and humidity sensors are mounted in the conditioned space and should be located away from supply air outlets to prevent short cycling.
Piping and Venting
Natural Gas or LPG
Ensure correct gas type for heaters. Gas service must be sized per the Equipment Data sheet and nameplate. Piping and regulator must supply required BTUH at 7-15 inches water column (11"-15" for LPG). Install a sediment trap, pressure regulator (lockup type), and union per NFPA 54.
Cooling Coil Drain Connections
Cooling coils require a properly trapped drain pan. The trap must be at least 8" deep with a 4" high drain leg. Trap dimensions may need reversal for blow-through coils.
Diagram shows a condensate drain trap with an 8" depth and a 4" high drain leg for proper function.
Vent Connections
Units with gas reactivation heaters have a "REACTIVATION VENT" PVC pipe outlet. For outdoor units, leave open to atmosphere. For indoor units, route to a drain or outside the building, sloped ¼" per foot toward the drain/outlet. Seal to drain to prevent exhaust entry.
Ducting
Indoor Units
Reactivation Ducting: Reactivation air must be ducted outside, away from air intakes, at least the same size as the outlet, and as short as possible. Ducts should be insulated externally and sloped toward the outside (½" per foot). Connections must be sealed. Recommended materials for the inside of the duct are aluminum or stainless steel to prevent corrosion from wet air.
Makeup Air Ducting: Makeup air inlets must be ducted to the outside, located away from contaminating sources.
Wiring Diagrams Description
The wiring diagrams illustrate the electrical control system for the Munters A40G unit.
- Page 13: Shows power distribution, supply fan control (motor, overload, airflow switch), reactivation fan control, and burner ignition/control (gas valve, flame detector, overheat switch). It details the sequence for the dehumidifier timer and wheel rotation.
- Page 14: Details the control of outside air and return air dampers using modulating actuators, and the connection of the speed control potentiometer for the OH drive motor.
- Page 15: Depicts the wiring for internal lights and GFCI protection, including light switches and additional GFI requirements.
- Page 16: Shows the wiring for the Viconics Humidistat, including its internal relay, sensor connections, and interface with the main unit control system.
