Fig. 73 – Gas Furnace Checklist
Furnace Location_____________________________ Installed altitude __________________
Furnace Orientation: ____Upflow ____Downflow ____Horizontal Right ____Horizontal Left
Gas Adjustment
LOCAL GAS HEAT CONTENT_____________(btu/cu. ft.) SPECIFIC GRAVITY________/cu. ft.
(contact your local gas utility-not required for propane)
INLET SUPPLY PRESSURE** ______________ in. W.C. ORIFICE #_____________
MANIFOLD PRESSURE: High fire___________ in. W.C. Low fire_____________ in. W.C.
**Supply pressure should be checked with furnace and all other gas appliances running
FIRING RATE: (CLOCKED METER FOR NAT. GAS – assure only furnace is running)
Firing rate = heat content (btu/cu. ft.) X size of the dial (cu. ft/rev) X # of rev. per 60 sec (rev/sec) X 3600 (sec/hr)
Example- (1050 btu/cu. ft.) X (0.5 cu. ft ./rev.) X (2 revs./60sec) X (3600 sec/hr)= 63,000 btu/hr
OR use the “Gas Rate” chart in the startup and adjustment section of the installation manual
HIGH HEAT_________________ btu/hr LOW HEAT ______________________________ btu/hr
LEAVING AIR TEMPERATURE __________(F) high _________ (F) low
RETURN AIR TEMPERATURE __________(F) high _________ (F) low
TEMPERATURE RISE __________(F) high _________ (F) low
Temperature rise is equal to the supply air temp minus the return air temp @ steady state operation.
The supply temperature should be measured away from the line of sight of the Heat Exchanger
+90 % VENTING SYSTEM
Pipe Dia_____________ # of Elbows_____________ Total Length _____________ft.
Termination Type: (circle one) Concentric 2 pipe (std)
Termination Locati on: (circle one) Roof Sidewall
MID-EFFICIENCY VENTING SYSTEM
METAL: (circle one) B vent Chimney Liner
Vent Dia________Total Ht.________
ft. Vent Conn. Dia_______ Conn. Length ______ft. # of Elbows________
Connector Type: Single Wall B Vent Connector Rise Above Furnace _________ft.
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