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R-410A
ZW SERIES
15 - 25 Ton
60 Hertz
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Rigging And Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Compressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Power And Control Wiring. . . . . . . . . . . . . . . . . . . . . . . . . 14
Optional Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Optional Gas Heat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Options/Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Air Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
1 ZW-15 thru -25 Unit Limitations . . . . . . . . . . . . . . . . . . . . 7
2 Weights and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 ZW-15 thru -25 Unit Accessory Weights . . . . . . . . . . . . . . 9
4 Utilities Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5 ZW-15 thru -25 Unit Clearances . . . . . . . . . . . . . . . . . . . 11
6 Control Wire Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7 Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8 ZW-15 thru -25 Physical Data . . . . . . . . . . . . . . . . . . . . . 20
9 Electric Heat Minimum Supply Air . . . . . . . . . . . . . . . . . . 21
10 Gas Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
11 Gas Pipe Sizing - CapacIty of Pipe . . . . . . . . . . . . . . . . . 22
12 Gas Heat Minimum Supply Air . . . . . . . . . . . . . . . . . . . . 22
13 Altitude/Temperature Correction Factors . . . . . . . . . . . . 27
1 ZW-15 thru -25 Component Location . . . . . . . . . . . . . . . . 6
2 Unit 4 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Unit 6 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Center of Gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 ZW-15 thru -25 Unit Dimensions Front View . . . . . . . . . . 9
6 ZW-15 thru -25 Unit Dimensions Rear View . . . . . . . . . 10
7 ZW-15 thru -25 Unit Dimensions Rain Hood . . . . . . . . . 11
8 ZW-15 thru -25 Roof Curb . . . . . . . . . . . . . . . . . . . . . . . 12
9 Fixed Outdoor Air Damper . . . . . . . . . . . . . . . . . . . . . . . 13
10 Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
12 Field Wiring 24 Volt Thermostat . . . . . . . . . . . . . . . . . . . 15
13 External Supply Connection External Shut-Off . . . . . . . 22
14 Bottom Supply Connection External Shut-Off . . . . . . . . 22
15 Vent and Combustion Air Hood . . . . . . . . . . . . . . . . . . . 24
TABLE OF CONTENTS
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Cooling Sequence Of Operation . . . . . . . . . . . . . . . . . . . . 41
No Outdoor Air Options . . . . . . . . . . . . . . . . . . . . . . . . . 41
Cooling Operation Errors . . . . . . . . . . . . . . . . . . . . . . . . 42
Electric Heating Sequence Of Operations . . . . . . . . . . . . 43
Electric Heat Operation Errors . . . . . . . . . . . . . . . . . . . . 43
Gas Heating Sequence Of Operations . . . . . . . . . . . . . . . 44
Gas Heating Operation Errors . . . . . . . . . . . . . . . . . . . . 45
Start-Up (Cooling) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Start-Up (Gas Heat) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Checking Gas Heat Input . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Charging The Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Unit Control Board Option Setup . . . . . . . . . . . . . . . . . . . . . . 56
Option Byte Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Heat Delay Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
LIST OF TABLES
15 ZW Gas Heat Bottom Duct Blower Performance . . . . . . 33
16 Indoor Blower Specifications . . . . . . . . . . . . . . . . . . . . . . 40
17 Power Exhaust Specifications . . . . . . . . . . . . . . . . . . . . 40
18 Additional Static Resistance . . . . . . . . . . . . . . . . . . . . . . 41
19 Limit Control Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
20 Electric Heat Anticipator Setpoint . . . . . . . . . . . . . . . . . . 44
21 Gas Heat Limit Control Setting . . . . . . . . . . . . . . . . . . . . 46
22 Gas Heat Anticipator Setpoints . . . . . . . . . . . . . . . . . . . . 46
23 Gas Rate Cubic Feet Per Hour . . . . . . . . . . . . . . . . . . . . 47
24 Unit Control Board Flash Codes . . . . . . . . . . . . . . . . . . . 55
25 Heat Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
LIST OF FIGURES
16 Enthalpy Set Point Chart . . . . . . . . . . . . . . . . . . . . . . . . 25
17 Honeywell Economizer Control W7212 . . . . . . . . . . . . . 25
18 Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
19 Altitude/Temperature Correction Factors . . . . . . . . . . . . 27
Air CFM For All Unit Tonnages . . . . . . . . . . . . . . . . . . . 40
21 Gas Valve Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
22 Gas Valve and Controls . . . . . . . . . . . . . . . . . . . . . . . . . 46
23 Proper Pilot Flame Adjustment . . . . . . . . . . . . . . . . . . . 48
24 Typical Flame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
25 Typical Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
26 ZW-15 (15 Ton) Charging Chart . . . . . . . . . . . . . . . . . . 49
27 ZW-18 (17.5 Ton) Charging Chart . . . . . . . . . . . . . . . . . 49
28 ZW-20 (20 Ton) Charging Chart . . . . . . . . . . . . . . . . . . 49
29 ZW-25 (25 Ton) Charging Chart . . . . . . . . . . . . . . . . . . 49
30 Unit Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
178113-BIM-D-0906
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Summary of Contents for Coleman ZW Series
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Page 1: Table Of Contents
R-410A ZW SERIES 15 - 25 Ton 60 Hertz TABLE OF CONTENTS General ......... . 2 Operation . -
Page 2: General
178113-BIM-D-0906 General UPG Model ZW units are either single package air conditions equipped with optional factory installed electric heaters, or single Before performing service or maintenance operations on package gas-fired central heating furnaces with cooling unit. unit, turn off main power switch to unit. Electrical shock Both are designed for outdoor installation on a rooftop or slab. - Page 3 178113-BIM-D-0906 Wear safety glasses and work gloves. Use quenching cloth and Renewal Parts have a fire extinguisher available during brazing operations. Contact your local UPG parts distribution center for authorized replacement parts. Inspection As soon as a unit is received, it should be inspected for possible Approvals damage during transit.
- Page 4 178113-BIM-D-0906 Nomenclature 15-25 Ton Model Number Nomenclature Z W -20 N30 A T A AA 1 0 1 2 4 A Product Category Product Style Z = A/C, Single Pkg., R-410A A = Style A Product Identifier Configuration Options (not required for all units) These four digits will not be assigned until a quote is requested, or an order placed.
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Page 5: Installation
178113-BIM-D-0906 Installation Limitations These units must be installed in accordance with the following: Installation Safety Information In U.S.A.: Read these instructions before continuing this appliance National Electrical Code, ANSI/NFPA No. 70 - Latest installation. This is an outdoor combination heating and cooling Edition unit. -
Page 6: Thru -25 Component Location
178113-BIM-D-0906 Simplicity ® Control Board Slide In/ Plug In Internal Economizer (Optional) 110 Volt Convenience Outlet (“Powered” or 2” Disposable Filters “Non-Powered” Optional) (4” Filters Optional) Disconnect Location (Optional Disconnect Switch) Bottom Power and Control Wiring Entry Power Ventor Motor Electric Heater Location (Optional Electric/Electric Units) Belt Drive... -
Page 7: Location
178113-BIM-D-0906 Table 1: ZW-15 thru -25 Unit Limitations Unit Limitations Size Unit Voltage Applied Voltage Outdoor DB Temp (Tons) Max (°F) 208/230-3-60 460-3-60 (15) 575-3-60 208/230-3-60 460-3-60 (17.5) 575-3-60 208/230-3-60 460-3-60 (20) 575-3-60 208/230-3-60 460-3-60 (25) 575-3-60 Location Clearances All units require particular clearances for proper operation and Use the following guidelines to select a suitable location for service. -
Page 8: Weights And Dimensions
178113-BIM-D-0906 Before lifting, make sure the unit weight is distributed equally on the rigging cables so it will lift evenly. Units may be moved or lifted with a forklift. Slotted openings in the base rails are provided for this purpose. LENGTH OF FORKS MUST BE A MINIMUM OF 90 INCHES. -
Page 9: Thru -25 Unit Accessory Weights
178113-BIM-D-0906 Table 3: ZW-15 thru -25 Unit Accessory Weights Weight (lbs.) Unit Accessory Shipping Operating Economizer Power Exhaust Electric Heat Gas Heat Double Wall Motorized Damper Barometric Damper Econ./Motorized Damper Rain Hood Econ./Power Exhaust Rain Hood Wood Skid Roof Curb 1. -
Page 10: Thru -25 Unit Dimensions Rear View
178113-BIM-D-0906 Dot Plug (for Pressure Evaporator Drop Reading) Section 40-3/8” Supply Outdoor Return 18-5/8” 40-1/2” Supply Air 27-3/4” Access Filter 5-1/8” Access 39-5/8” 1” NPT Female Dimensions listed are for side duct Return Air Outdoor Air Cond. Drain flange opening; see Field Accessories Access Compartment Connector... -
Page 11: Thru -25 Unit Clearances
178113-BIM-D-0906 Economizer Motorized Power Exhaust Damper Rain Hood Rain Hood Supply Air (on Outdoor (on Return Compartment Air Compartment) Economizer/Motorized Damper Air Compartment) and Power Exhaust Rain Hood Fixed Outdoor Air Intake Hood (Located on 36-5/8” Return Air 1” Condensate Compartment) Drain (Must be 16-1/8”... -
Page 12: Ductwork
178113-BIM-D-0906 25-1/4" Figure 8: ZW-15 thru -25 Roof Curb Ductwork Gasketing and mounting screws are provided in a parts bag attached to the hood assembly. Apply gasketing to the three Ductwork should be designed and sized according to the flange surfaces on the hood prior to installing the hood. Extend methods in Manual D of the Air Conditioning Contractors of gasketing 1/4 inch beyond the top and bottom of the two side America (ACCA) or as recommended by any other recognized... -
Page 13: Condensate Drain
178113-BIM-D-0906 The compressor also uses a polyolester (POE oil), Mobil 3MA POE. This oil is extremely hygroscopic, meaning it absorbs water readily. POE oil can absorb 15 times as much water as other oils designed for HCFC and CFC refrigerants. Take all necessary Side Supply precautions to avoid exposure of the oil to the atmosphere. -
Page 14: Power And Control Wiring
178113-BIM-D-0906 Power And Control Wiring NOTE: Since not all local codes allow the mounting of a disconnect on the unit, please confirm compliance with Field wiring to the unit, fuses, and disconnects must conform to local code before mounting a disconnect on the unit. provisions of National Electrical Code (NEC), ANSI/NFPA No. -
Page 15: Control Wire Sizes
178113-BIM-D-0906 Thermostat Wiring should be used to connect the thermostat to the unit. Refer to Table 6 for control wire sizing and maximum length. The thermostat should be located on an inside wall approximately 56 inch above the floor where it will not be subject to drafts, sun Table 6: Control Wire Sizes exposure or heat from electrical fixtures or appliances. -
Page 16: Electrical Data
178113-BIM-D-0906 Table 7: Electrical Data ZW-15 thru -25 - Without Powered Convenience Outlet OD Fan Supply Max Fuse Compressors Motors Blower Conv Electric Heat Option Size Breaker (each) Volt (each) Motor Motor (Tons) (Amps) Size (Amps) RLA LRA MCC Model Stages Amps None... - Page 17 178113-BIM-D-0906 ZW-15 thru -25 - Without Powered Convenience Outlet (Continued) OD Fan Supply Max Fuse Compressors Motors Blower Conv Electric Heat Option Size Breaker (each) Volt (each) Motor Motor (Tons) (Amps) Size (Amps) RLA LRA MCC Model Stages Amps None 155.1 13.5 37.5...
- Page 18 178113-BIM-D-0906 ZW-15 thru -25 - With Powered Convenience Outlet OD Fan Supply Max Fuse Compressors Motors Blower Conv Electric Heat Option Size Breaker (each) Volt (each) Motor Outlet (Tons) (Amps) Size (Amps) RLA LRA MCC Model Stages Amps None 96.5 13.5 37.5 96.5...
- Page 19 178113-BIM-D-0906 ZW-15 thru -25 - With Powered Convenience Outlet (Continued) OD Fan Supply Max Fuse Compressors Motors Blower Conv Electric Heat Option Size Breaker (each) Volt (each) Motor Outlet (Tons) (Amps) Size (Amps) RLA LRA MCC Model Stages Amps None 165.1 13.5 37.5...
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Page 20: Thru -25 Physical Data
178113-BIM-D-0906 Table 8: ZW-15 thru -25 Physical Data Models Component ZW-15 ZW-18 ZW-20 ZW-25 Nominal Tonnage 17.5 ARI COOLING PERFORMANCE Gross Capacity @ ARI A point (Btu) 183500 213700 242000 312000 ARI net capacity (Btu) 178500 206000 235000 295000 12.4 12.1 11.6 10.4... -
Page 21: Optional Electric Heat
178113-BIM-D-0906 Table 8: ZW-15 thru -25 Physical Data (Continued) Models Component ZW-15 ZW-18 ZW-20 ZW-25 Nominal Tonnage 17.5 Type Prop Prop Prop Prop Drive type Direct Direct Direct Direct No. speeds Number of motors Motor HP each Nominal total CFM 4000 4000 5000... -
Page 22: Gas Application Data
178113-BIM-D-0906 Table 11: Gas Pipe Sizing - CapacIty of Pipe Table 10: Gas Application Data Length of Nominal Iron Pipe Size Unit Input Temp Rise Output (MBH) Pipe (ft.) 1 in. 1-1/4 in. Size Opt. (MBH) (°F) 1050 20-50 30-60 20-50 30-60 20-50... - Page 23 178113-BIM-D-0906 The gas supply should be a separate line and installed in The proper pressure regulation. (Two-stage regulation is accordance with all safety codes as prescribed under recommended). “Limitations”. The pressure drop in the lines between regulators and A 1/8-inch NPT plugged tapping, accessible for test gage between the second stage regulator and the appliance.
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Page 24: Options/Accessories
178113-BIM-D-0906 Minimum Position Adjustment • Check that the damper blades move smoothly without binding; carefully turn the Minimum Position Adjust screw (found on the damper control module) fully clockwise and Slotted Openings in then set the thermostat indoor fan switch to the ON Access Panel position and then OFF or energize and de-energize Vent Air... -
Page 25: Enthalpy Set Point Chart
178113-BIM-D-0906 CONTROL POINT CONTROL APPROX. CURVE (29) (32) (35) (38) (41) (43) AT 50% RH 73 (23) 70 (21) (27) 67 (19) 63 (17) (24) (21) (18) (16) (13) (10) (10) (13) (16) (21) (24) (27) (29) (32) (38) (41) (43) (18) (35) -
Page 26: Belt Adjustment
178113-BIM-D-0906 Phasing UPG Model ZW units are properly phased at the factory. Check for proper compressor rotation. If the blower or compressors rotate in the wrong direction at start-up, the electrical Procedure for adjusting belt tension: connection to the unit is misphased. Change the phasing of the 1. -
Page 27: Altitude/Temperature Correction Factors
178113-BIM-D-0906 Table 13: Altitude/Temperature Correction Factors Altitude (Ft.) Temp. 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 1.060 1.022 0.986 0.950 0.916 0.882 0.849 0.818 0.788 0.758 0.729 1.039 1.002 0.966 0.931 0.898 0.864 0.832 0.802 0.772 0.743 0.715 1.019 0.982... -
Page 28: Zw Cooling Only Bottom Duct Blower Performance
178113-BIM-D-0906 Table 14: ZW Cooling Only Bottom Duct Blower Performance ZW-15 (15 Ton) Standard Drive Cooling Only Bottom Duct Blower Performance 15 Ton Standard Drive Cooling Only Bottom Duct Blower Performance Turns Open 1 Turn 2 Turns 3 Turns 4 Turns 5 Turns 6 Turns CFM RPM... - Page 29 178113-BIM-D-0906 ZW-18 (17.5 Ton) Standard Drive Cooling Only Bottom Duct Blower Performance 17.5 Ton Standard Drive Cooling Only Bottom Duct Blower Performance Turns Open 1 Turn 2 Turns 3 Turns 4 Turns 5 Turns 6 Turns CFM RPM BHP CFM RPM BHP CFM RPM BHP CFM RPM BHP CFM RPM...
- Page 30 178113-BIM-D-0906 ZW-20 (20 Ton) Standard Drive Cooling Only Bottom Duct Blower Performance 20 Ton Standard Drive Cooling Only Bottom Duct Blower Performance Turns Open 1 Turn 2 Turns 3 Turns 4 Turns 5 Turns 6 Turns CFM RPM BHP CFM RPM BHP CFM RPM BHP CFM RPM BHP CFM RPM...
- Page 31 178113-BIM-D-0906 ZW-25 (25 Ton) Standard Drive Cooling Only Bottom Duct Blower Performance 25 Ton Standard Drive Cooling Only Bottom Duct Blower Performance Turns Open 0 Turns 1 Turn 2 Turns 3 Turns 4 Turns 11416 1365 10722 12.22 10967 1329 9910 11.30 10532...
- Page 32 178113-BIM-D-0906 ZW-25 (25 Ton) Hi-Static Drive Cooling Only Bottom Duct Blower Performance 25 Ton Hi-Static Drive Cooling Only Bottom Duct Blower Performance Turns Open 0 Turns 1 Turn 2 Turns 3 Turns 4 Turns – – – – – – –...
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Page 33: Zw Gas Heat Bottom Duct Blower Performance
178113-BIM-D-0906 Table 15: ZW Gas Heat Bottom Duct Blower Performance ZW-15 (15 Ton) Standard Drive Gas Heat Bottom Duct Blower Performance 15 Ton Standard Drive Gas Heat Bottom Duct Blower Performance TURNS OPEN 1 Turn 2 Turns 3 Turns 4 Turns 5 Turns 6 Turns CFM RPM... - Page 34 178113-BIM-D-0906 ZW-18 (17.5 Ton) Standard Drive Gas Heat Bottom Duct Blower Performance 17.5 Ton Standard Drive Gas Heat Bottom Duct Blower Performance Turns Open 1 Turn 2 Turns 3 Turns 4 Turns 5 Turns 6 Turns CFM RPM BHP CFM RPM BHP CFM RPM BHP CFM RPM BHP CFM RPM...
- Page 35 178113-BIM-D-0906 ZW-18 (17.5 Ton) Hi-Static Drive Gas Heat Bottom Duct Blower Performance 17.5 Ton Hi-Static Drive Gas Heat Bottom Duct Blower Performance Turns Open 1 Turn 2 Turns 3 Turns 4 Turns 5 Turns 6 Turns CFM RPM BHP CFM RPM BHP CFM RPM BHP CFM RPM BHP CFM RPM...
- Page 36 178113-BIM-D-0906 ZW-20 (20 Ton) Standard Drive Gas Heat Bottom Duct Blower Performance 20 Ton Standard Drive Gas Heat Bottom Duct Blower Performance Turns Open 1 Turn 2 Turns 3 Turns 4 Turns 5 Turns 6 Turns CFM RPM BHP CFM RPM BHP CFM RPM BHP CFM RPM BHP CFM RPM...
- Page 37 178113-BIM-D-0906 ZW-20 (20 Ton) Hi-Static Drive Gas Heat Bottom Duct Blower Performance 20 Ton Hi-Static Drive Gas Heat Bottom Duct Blower Performance Turns Open 1 Turn 2 Turns 3 Turns 4 Turns 5 Turns 6 Turns CFM RPM BHP CFM RPM BHP CFM RPM BHP CFM RPM BHP CFM RPM...
- Page 38 178113-BIM-D-0906 ZW-25 (25 Ton) Standard Drive Gas Heat Bottom Duct Blower Performance 25 Ton Standard Drive Gas Heat Bottom Duct Blower Performance Turns Open 0 Turns 1 Turn 2 Turns 3 Turns 4 Turns 12538 1101 11592 14.15 11984 1070 10591 12.92 11460 1038 9646 11.77 12714 1133 12215 14.91 12131 1102 11159 13.62 11578 1070 10158 12.40 11054 1038 9212 11.24...
- Page 39 178113-BIM-D-0906 ZW-25 (25 Ton) Hi-Static Drive Gas Heat Bottom Duct Blower Performance 25 Ton Standard Drive Gas Heat Bottom Duct Blower Performance Turns Open 0 Turns 1 Turn 2 Turns 3 Turns 4 Turns 12606 1217 13475 16.44 12141 1217 12901 15.74 12472 1254 13836 16.88 11659 1216 12304 15.02 11973 1254 13214 16.12 11160 1216 11682 14.26 11455 1254 12562 15.33 10642 1216 11031 13.46...
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Page 40: Air Balance
178113-BIM-D-0906 Table 16: Indoor Blower Specifications Motor Motor Sheave Blower Sheave Size Datum Dia. Datum Dia. Belt (Tons) Eff. Frame Bore (in.) Model Bore (in.) Model (in.) (in.) 1725 0.83 1.15 184T 4.3 - 5.3 1-1/8 1VP56 BK90 BX81 (15) 1725 0.83 1.15... -
Page 41: Operation
178113-BIM-D-0906 Supply Air Drive Adjustment If at any time a call for both heating and cooling are present, the heating operation will be performed. If operating, the cooling The RPM of the supply air blower will depend on the required system is halted as with a completion of a call for cooling. -
Page 42: Cooling Operation Errors
178113-BIM-D-0906 Economizer With Single Enthalpy Sensor Cooling Operation Errors When the room thermostat calls for “first-stage” cooling, the low Each cooling system is monitored for operation outside of the voltage control circuit from “R” to “G” and “Y1” is completed. intended parameters. -
Page 43: Electric Heating Sequence Of Operations
178113-BIM-D-0906 Low Ambient Cooling Flash Codes To determine when to operate in low ambient mode, the UCB The UCB will initiate a flash code associated with errors within has a pair of terminals connected to a temperature-activated the system. Refer to UNIT CONTROL BOARD FLASH CODES switch set at 45ºF. -
Page 44: Gas Heating Sequence Of Operations
178113-BIM-D-0906 Safety Controls Electric Heat Anticipator Setpoints The UCB monitors the temperature limit switch of electric heat It is important that the anticipator setpoint be correct. Too high units. of a setting will result in longer heat cycles and a greater temperature swing in the conditioned space. -
Page 45: Gas Heating Operation Errors
178113-BIM-D-0906 When the thermostat calls for the second stage of heating, the blower will be de-energized following the elapse of the fan off low-voltage control circuit from “R” to “W2” is completed, thru delay for heating. the UCB. Heat relay “RW2” is energized. The “RW2-1” contact This limit is monitored regardless of unit operation status, i.e. -
Page 46: Start-Up (Cooling)
178113-BIM-D-0906 Rollout Switch Gas Heat Anticipator Setpoints This switch is located above the main burners in the control It is important that the anticipator setpoint be correct. Too high compartment, which in the event of a sustained main burner of a setting will result in longer heat cycles and a greater rollout shuts off and locks out both ignition controls closing both temperature swing in the conditioned space. -
Page 47: Start-Up (Gas Heat)
178113-BIM-D-0906 Start-Up (Gas Heat) units. If gas pressure is outside these limits, contact the local gas utility or propane supplier for corrective action. Pre-Start Check List Shut Down Complete the following checks before starting the unit. Check the type of gas being supplied. Be sure that it is the Set the thermostat to the lowest temperature setting. -
Page 48: Proper Pilot Flame Adjustment
178113-BIM-D-0906 Manifold Gas Pressure Adjustment Pilot Checkout The pilot flame should envelope the end of the flame sensor. To Small adjustments to the high-fire gas flow may be made by adjust pilot flame, (1) remove pilot adjustment cover screw, (2) turning the pressure regulator adjusting screw on the automatic increase or decrease the clearance for air to the desired level, gas valve. -
Page 49: Charging The Unit
178113-BIM-D-0906 Charging The Unit 15 Ton Charging Chart 20 Ton Charging Chart 115°F 115°F Outdoor Outdoor 105°F 105°F Outdoor Outdoor 95°F 95°F Outdoor Outdoor 85°F 85°F Outdoor Outdoor 75°F 75°F Outdoor Outdoor 65°F 65°F Outdoor Outdoor 110 115 120 125 130 135 140 145 150 155 160 165 170 110 115 120 125 130 135 140 145 150 155 160 165 170 Suction Pressure (psig) Suction Pressure (psig) -
Page 50: Troubleshooting
178113-BIM-D-0906 Troubleshooting b. Proper wiring between the room thermostat and the UCB, and c. Loose wiring from the room thermostat to the UCB If 24 volts is present at the room thermostat but not at the UCB, check for proper wiring between the thermostat and Troubleshooting of components may require opening the UCB, i.e. - Page 51 178113-BIM-D-0906 If 24 volts is present at the UCB Y1 terminal and none of the time. This programming can be checked or changed by the protection switches have opened, the UCB may have locked local distributor. out the compressor for repeat trips. The UCB should be 15.
- Page 52 178113-BIM-D-0906 should be flashing a code. If not, press and release the If 24 volts is not present at M1, check for 24 volts at the ALARMS button on the UCB. The UCB will flash the last UCB terminal, C1. If 24 volts is present, check for loose five alarms on the LED.
- Page 53 178113-BIM-D-0906 the Mate-N-Lock plug to the Y1 “ECON” terminal. The Failing the above, if there is line voltage supplied at M3, M3 economizer control may have faulted and is not returning is pulled in, and the supply air blower motor still does not the 24 volts to the Y1 “ECON”...
- Page 54 178113-BIM-D-0906 for proper furnace operation. If lock-out continues to occur, Check the supply pressure as described in “POST START locate the source of the problem and correct. CHECK LIST” page 47. Make adjustments as necessary. Check all 24 volt connections from the relay board to and in Check the pilot orifice for obstruction as described in the gas heat section.
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Page 55: Unit Control Board Flash Codes
178113-BIM-D-0906 alarm condition but due to the space constraints of the UCB, ASCDs for one cycle, press and release the UCB TEST/ will be indicated by the Red LED. In all other cases, a flashing RESET button once. Green LED will be used to indicate non-alarm conditions. Flash codes that do and do not represent alarms are listed in In some cases, it may be necessary to “zero”... -
Page 56: Unit Control Board Option Setup
Unit Control Board Option Setup • The 8, 4, 2 and 1 LEDs will then show the status of the Heat Delay, (See Table 25). Press the UP or Down button to change the LED status to correspond to the desired Option Byte Setup Heat Delay Value.