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Installation Manual
INSTALLATION
INSTRUCTIONS
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
OUTDOOR FURNACES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
OUTDOOR FURNACES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PRE-INSTALLATION INSPECTION . . . . . . . . . . . . . . . . . . . . . . . 3
CODE COMPLIANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
FURNACE LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
CLEARANCE TO COMBUSTIBLE MATERIALS . . . . . . . . . . . 4
OUTSIDE SLAB INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . 4
COMBUSTION AND VENTILATION AIR . . . . . . . . . . . . . . . . . . . 4
ASSEMBLIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FURNACE SIZING AND DUCT SYSTEM DESIGN . . . . . . . . . . . 5
A/C USAGE DUCT SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . 6
RETURN AIR, FILTERS, AND DUCT CONNECTIONS . . . . . . . . 6
RETURN AIR TEMPERATURE . . . . . . . . . . . . . . . . . . . . . . . . 6
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
DUCT CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
ELECTRICAL WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SERVICE WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ELECTRICAL GROUNDING . . . . . . . . . . . . . . . . . . . . . . . . . . 9
CONTROL WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
HEAT ANTICIPATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
BLOWER MOTOR SPEED SELECTION . . . . . . . . . . . . . . . . . 9
MOTOR TERMINAL IDENTIFICATION . . . . . . . . . . . . . . . . . 10
BLOWER TIMINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
PRE-OPERATIONAL CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . 12
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
FURNACE OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . 13
GAS SHUTOFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
INSTALLATION CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
CHECKING GAS INPUT RATE . . . . . . . . . . . . . . . . . . . . . . . 13
HIGH ALTITUDE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . 13
HOW TO DETERMINE GAS INPUT RATE . . . . . . . . . . . . . . . . 14
CONVERSION INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . 14
MINOR INPUT ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . 14
MEASURING AIR TEMPERATURE RISE . . . . . . . . . . . . . . . 14
BLOWER REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
CAUTION: READ ALL SAFETY GUIDES BEFORE YOU
START TO INSTALL YOUR FURNACE.
SAVE THIS MANUAL
80% OUTDOOR
IGNITION FURNACES
MODELS: G8C
50 THUR 125 MBH OUTPUT
035-15881-402 REV. A (1199)
AUTOMATIC
EFFICIENCY
RATING
CERTIFIED
®
650.67-N2V
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Table of Contents
Related Manuals for Unitary products group G8C
Summary of Contents for Unitary products group G8C
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Page 1: Table Of Contents
INSTRUCTIONS IGNITION FURNACES MODELS: G8C 50 THUR 125 MBH OUTPUT GENERAL INFORMATION ......2 SPECIFICATIONS . -
Page 2: General Information
1945 1775 MEDIUM HIGH 1660 1645 1620 1605 1585 1515 1480 1360 MEDIUM LOW 1440 1420 1385 1375 1360 1305 1280 1210 1265 1250 1240 1235 1200 1190 1135 1050 See Figure 1 to determine chassis size. Unitary Products Group... -
Page 3: Pre-Installation Inspection
The manufacturer assumes no responsi- air intake discharging into habitable areas. The bility for equipment installed in violation of any code or regu- flue outlet and combustion air inlet must not be lation. blocked or closed for any reason. Unitary Products Group... -
Page 4: Clearance To Combustible Materials
#10 sheet metal screws needed for the installation. (See Figure 2.) Use four of the screws to attach the exhaust hood assembly to the cabinet, and the remaining seven to attach the intake air hood. (See Figure 2.) Unitary Products Group... -
Page 5: Furnace Sizing And Duct System Design
These values are listed in Table 1: Unitary Products Group... -
Page 6: A/C Usage Duct System
When installing duct outdoors where it will be exposed to weather, care must be taken to completely weatherproof both ducts and insulation. Take any additional measures, such as flashings and caulking compound, necessary to provide a good weather seal. Unitary Products Group... -
Page 7: Gas Piping
5 AMP. AUTOMATIC TYPE MANIFOLD CONTROL TRANSFORMER BURNERS LINE VOLTAGE TERMINAL BLOCK IGNITOR LOW VOLTAGE BOX LIMIT SWITCH BLOWER MOTOR CAPACITOR LIMIT SWITCH BLOWER BLOWER ASSEMBLY ASSEMBLY FIGURE 3 : OUTDOOR FURNACE: BURNER COMPARTMENT AND BLOWER ASSEMBLIES Unitary Products Group... -
Page 8: Electrical Wiring
LETTER SMALL LARGE 2-1/8” 1-3/4” 2-1/8” 2-1/8” 2-1/4” 1-3/4” 2-31/32” 4-1/8” 1-9/16” 1-9/16” LINE VOLTAGE SUPPLY INLETS 7/8 DIA. LOW VOLTAGE INLET HOLE FIGURE 4 : BASE MODEL FRONT VIEW Unitary Products Group... -
Page 9: Service Wiring
The thermostat should be installed in accordance with the manufacturer's instructions, furnished with the thermostat, and make connections to the unit as shown on the unit wiring diagram. It is recommended that size 18 AWG wire be used. Unitary Products Group... -
Page 10: Motor Terminal Identification
The T. I. electronic furnace control has four pins and a small FIGURE 6 : BLOWER TIMING CHANGE jumper plug which is used to adjust the blower off delay. Push the jumper plug on the two pins adjacent to the desired blower delay time. (See Figure 6.) Unitary Products Group... -
Page 11: Wiring Diagram
- REVERSED LINE VOLTAGE POLARITY TEN FLASHES - NO CODE ELEVEN FLASHES - DISCONNECTED JUMPER ON CONTROL STEADY ON - GAS VALVE ENERGIZED WITH “W” OFF OR CONTROL VALVE FAILURE FIGURE 7 : WIRING DIAGRAM - 115 VOLT MODELS Unitary Products Group... -
Page 12: Pre-Operational Checks
The system will remain in lock-out mode until the room thermostat is cycled off then back on, or one hour has elapsed, causing the furnace to try for ignition again. Unitary Products Group... -
Page 13: Operating Instructions
In such cases, the gas orifices must be changed to a smaller size. The chart below shows the proper gas orifice to use at various altitudes for either natural or LP (propane) gas. Unitary Products Group... -
Page 14: How To Determine Gas Input Rate
If it is determined that different orifices are needed, please contact your distributor for assistance in selecting the correct replacement. Operating the furnace outside of the proper air temperature rise range may cause poor heating performance and shorter heat exchanger life. Unitary Products Group... -
Page 15: Blower Removal
Lift the blower assembly up to clear the bottom offset mounting bracket, and pull toward you to remove. Unitary Products Group... - Page 16 10. BLOWER WHEEL 22. GAS ORIFICE 11. FURNACE CONTROL 23. EXHAUST VENT HOOD Subject to change without notice. Printed in U.S.A. 035-15881-402 REV. A Copyright © by Unitary Products Group 1999. All rights reserved. Supersedes: 035-15881-401(1098) 650.67-N2V (1199) Unitary 5005 Norman...