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INSTALLATION
INSTRUCTIONS
TABLE OF CONTENTS
GENERAL INFORMATION ......................................1
FURNACE SPECIFICATIONS .................................2
PRE-INSTALLATION INSPECTION ........................3
CODE COMPLIANCE ..............................................3
INSTALLATION POSITION......................................3
CONVERSION INFORMATION ...............................3
CONFIGURATION ...................................................4
CONFIGURATION ...................................................5
FURNACE LOCATION.............................................5
COMBUSTION AND VENTILATION AIR.................6
RETURN AIR AND FILTERS ...................................8
GAS PIPING ...........................................................10
VENTING (CATEGORY I) ......................................12
SIDEWALL VENTING ............................................15
ELECTRICAL WIRING ...........................................15
WIRING DIGRAM...................................................17
PRE-OPERATIONAL CHECKS .............................18
SEQUENCE OF OPERATION ...............................18
FURNACE OPERATION ........................................18
INSTALLATION CHECKS ......................................19
SERVICE INSTRUCTIONS....................................21
REPLACEMENT PARTS........................................21
Supersedes: Nothing
MODELS: G8C 50 THRU 125 INPUT
& L8C 50 THRU 125 INPUT
ALL POSITION AUTOMATIC
IGNITION FURNACES
GENERAL INFORMATION
These instructions are for the use of qualified
individual specially trained and experienced in
installation of this type equipment and related
system components.
Installation and service personnel are required
by some states to be licensed. Persons not
qualified shall not install this equipment nor
interpret these instructions
NOTE: The words "shall" or "must" indicate a
requirement
satisfactory and safe performance.
The words "should" or "may" indicate a
recommendation or advice which is not
essential and not required but which may be
useful or helpful.
NOTE: After installing the furnace, show the user
how to turn off the electrical power and gas
supply to the furnace. Make sure that the
user
understands
following all safety rules.
650.66-N2V (9/98)
035-15815-401
which
is
essential
the
importance
to
of
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Related Manuals for Unitary products group G8C 50
Summary of Contents for Unitary products group G8C 50
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Page 1: Table Of Contents
INSTALLATION IGNITION FURNACES INSTRUCTIONS Supersedes: Nothing 650.66-N2V (9/98) 035-15815-401 MODELS: G8C 50 THRU 125 INPUT & L8C 50 THRU 125 INPUT TABLE OF CONTENTS GENERAL INFORMATION GENERAL INFORMATION ........1 FURNACE SPECIFICATIONS .........2 These instructions are for the use of qualified PRE-INSTALLATION INSPECTION ......3... -
Page 2: Furnace Specifications
FURNACE SPECIFICATIONS FURNACE BLOWER TEMP. BTUH MOTOR VENT DOWNFLOW RISE OUTLET WIDTH WHEEL HIGH @ INPUT DIA. SUB-BASE °F TEMP. °F SIZE 0.5” W.C. 50,000 17-1/2 10 x 8 30-60 1200 3” 2802-5521 75,000 17-1/2 10 x 8 35-65 1200 4”... -
Page 3: Pre-Installation Inspection
PRE-INSTALLATION INSPECTION The installer must conform to all state, local and provincial building codes when installing these Inspect the shipping container and furnace for any appliances. In the absence of state, local or provin- evidence of shipping damage. cial codes, these furnaces and related equipment If furnace damage is found, notify freight carrier and must be installed in accordance with the latest issue file claim. -
Page 4: To Convert From Downflow To Upflow Configuration
FIGURE 2 – UPFLOW/HORIZONTAL FIGURE 3 – DOWNFLOW/HORIZONTAL CONFIGURATION CONFIGURATION TO CONVERT FROM DOWNFLOW TO 10. Line up the vent blower mounting holes with the UPFLOW CONFIGURATION holes in the vent pan and screw it into place. Use the same machine screws that held the vent 1. -
Page 5: To Convert From Upflow To Downflow Configuration
TO CONVERT FROM UPFLOW TO 13. Plug in the vent motor wires. DOWNFLOW CONFIGURATION 14. Plug the pressure hose into the vent blower. 1. Lay the furnace on its back. 15. Remove the round knockout at the right side of the top cap (See Figure 5). -
Page 6: Combustion And Ventilation Air
Minimum Clearances – Upflow Front: ........2 inches Failure to maintain proper clearances to combustible materials can cause a fire, Back:.......... 0 inches which could result in damage, death or per- Sides:......... 0 inches sonal injury. Top..........1 inch NOTE: This furnace must be installed so the B-1 Vent:........ - Page 7 Installations in an Unconfined Space An unconfined space is defined as a space whose volume is more than 50 cubic feet per 1000 BTUH of This furnace is not to be used as a construction the total input ratings of all appliances installed in heater to supply heat to an unfinished building the space.
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Page 8: Furnace Sizing And Duct System Design
b. A blower-coil type cooling coil must be in- FURNACE SIZING AND DUCT SYSTEM stalled in parallel with and isolated from the DESIGN furnace, or The duct system must be installed in conformance c. A self-contained A/C unit must be in parallel with ASHRAE/NFPA 90, Standard for Installation of with and isolated from the furnace. - Page 9 When side return air ducts are used, a solid When the furnace is installed so that supply metal block-off panel must be used to block the ducts carry air circulated by the furnace to bottom opening in the furnace. Failure to do so areas outside the space containing the fur- could cause flue gases to be drawn into the liv- nace, the return air must also be handled by...
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Page 10: Gas Piping
Horizontal INPUT Furnace Cleanable Disposable An appropriately sized permanent cleanable or BTUH Width Filter Filter disposable filter shall be used. The filter should be 50,000 17-1/2 14 x 20 (2) 10 x 20 installed behind a return grille or other location with easy access for filter change. - Page 11 FIGURE 9 – DOWNFLOW CONFIGURATION FIGURE 10 – UPFLOW CONFIGURATION...
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Page 12: Venting (Category I)
Unless prohibited by local codes, it is permissible to The vent installation shall be in accordance with Part use a flexible corrugated metal gas connector for the 7, Venting of Equipment, of the NATIONAL FUEL last section of gas piping connected to the furnace GAS CODE, ANSI Z223.1, or applicable provisions gas valve. - Page 13 Vent System Sizing Venting with Metal Pipe Refer to the venting tables in the NATIONAL FUEL Type B (double wall) vents must extend in a gener- GAS CODE, ANSI Z223.1 for details on proper ally vertical direction with offsets exceeding 45 sizing of the vent system for this furnace.
- Page 14 nected to the common venting system placed in Condensation operation, while the other appliances remaining These furnaces are not intended to have condensa- connected to the common venting system are not in tion occur in the furnace or in the venting system. operation: Such condensation can cause corrosion and 1.
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Page 15: Sidewall Venting
SIDEWALL VENTING Electrical Grounding For applications where vertical Category I venting is The furnace casing must have an uninterrupted not possible, the only recommended method of electrical ground in accordance with the National Electrical Code ANSI/NFPA 70 or, in Canada, with sidewall venting is through the use of an accessory power venter. - Page 16 Blower Motor Speed Selection These furnaces are equipped with blowers, which have multi-speed direct drive motors. SHOCK HAZARD – Be sure electrical power to furnace is turned off before changing motor The blower speed selected is dependent upon the speeds. design and static pressure loss of the duct system.
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Page 17: Wiring Digram
Five flashes - Rollout switch open - Check for open Diagnostics rollout switches, loose connections in rollout switch The electronic furnace control supplied on this circuit. furnace is equipped with a diagnostic light, which Six flashes - One hour pressure switch lockout - flashes when there is a service problem with the Pressure switch has cycled four times in a single call furnace. -
Page 18: Pre-Operational Checks
6. If the burners fail to light within 6-8 seconds after PRE-OPERATIONAL CHECKS the gas valve opens, the gas valve will close and the ignitor will be turned off. After a short pause, the system will recycle and try again for ignition. If the burners fail to light after three tries, the SHOCK HAZARD –... -
Page 19: Installation Checks
3. USE ONLY YOUR HAND TO MOVE THE GAS shows the location of the shutoff lever or switch. To CONTROL LEVER OR SWITCH. NEVER USE turn off gas to the furnace, move the lever or switch TOOLS. IF THE LEVER OR SWITCH WILL to the "OFF"... - Page 20 changed to a smaller size. The chart below shows your distributor for assistance in selecting the correct the proper gas orifice to use at various altitudes for replacement. either natural or LP (propane) gas. Minor Input Adjustment High Altitude Gas Orifices Altitude above sea level in feet The input may be adjusted slightly by adjusting the pressure in the gas valve in order to change mani-...
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Page 21: Service Instructions
Balance the System REPLACEMENT PARTS The air distribution system should be balanced, Should it be necessary to replace any component using in-line duct dampers if employed, to provide parts, these may be obtained through an authorized for satisfactory air delivery to room. It is recom- dealer, who is experienced and can be of assis- mended that dampers in registers not be used for tance. - Page 22 FIGURE 15 – REPAIR PARTS VIEW (UPFLOW CONFIGURATION SHOWN) 1. Door Panel 11. Furnace Control 21. Blower Motor Clamp 2. Blower Door 12. Pressure Switch 22. Rubber Motor Mounts 3. Heat Exchanger 13. Gas Valve 23. Transition 4. Vent Blower 14.
- Page 24 Subject to change without notice. Printed in U.S.A Copyright by Unitary Product Group 1998. All rights reserved 035-15815-401 (9/98) P.I. Unitary Post Office Wichita Products Box 19014 Group 67204...