GM9S80 Service Manual

SYSTEM OPERATION
12
PROVIDE 8" MINIMUM CLEARANCE BETWEEN
CENTER ROD AND FURNACE CABINET TO
ALOW FOR CIRCULATOR BLOWER REMOVAL.
ALTERNATE
GAS PIPING
ASSURE FURNACE IS LEVEL FROM
END TO END. ON 90% FURNACES
MAKE SURE THE UNIT HAS A
SLIGHT FORWARD TILT WITH THE
FRONT OF THE FURNACE 0"-3/4"
BELOW THE BACK OF THE
FURNACE.
CONDENSATE
DRAIN
TILT OUTWARD TO ALLOW FOR
DOOR AND CIRCULATOR
BLOWER REMOVAL
POSITION AS CLOSE AS
POSSIBLE TO BLOWER DECK TO
ALLOW FOR CIRCULATOR
BLOWER REMOVAL.
2"x2"x1/8" ANGLE IRON
(3 PLACES)
GAS PIPING
SUPPORT
NUTS
HOLD DOWN
NUTS
3/8" DIAMETER
THREADED ROD
(6 PLACES)



system serving other appliances, the venting system may be
too large to properly vent the remaining attached appliances.
The following vent testing procedure is repro duced from the
-


The following steps shall be followed with each appliance
connected to the venting system placed in operation, while
any other appliances connected to the venting system are
not in operation:
a. Seal any unused openings in the venting system;
b. Inspect the venting system for proper size and
horizontal pitch, as required by the National
Fuel Gas Code, ANSI Z223.1 or the CSA B149
Installation Codes and these instructions. De-
termine that there is no blockage or restriction,

could cause an unsafe condition.
c. In so far as practical, close all building doors
and windows and all doors between the space
in which the appliance(s) connected to the
venting system are located and other spaces
of the building. Turn on clothes dryers and any
appliance not connected to the venting system.




d. Follow the lighting instructions. Place the appli-
ance being inspected in operation. Adjust ther-
mostat so appliance shall operate continuously;
e. Test for draft hood equipped spillage at the draft
hood relief opening after 5 minutes of main

candle.
f. After it has been determined that each appli-
ance connected to the venting system properly
vents when tested as outlined above, return
-
ers and any other gas burning appliance to their
previous conditions of use;
g. If improper venting is observed during any of
the above tests, the common venting system
must be corrected.
Corrections must be in accordance with the latest edition of
the National Fuel Gas Code NFPA 54/ANSI Z223.1 and/or
CSA B149 Installation Codes.
If resizing is required on any portion of the venting system,
          -
tion of the National Fuel Gas Code ANSI Z223.1 and/or
CSA B149 Installation Codes.

A high quality single stage thermostat with a common termi-
nal is recommended.

In an area having good air circulation, locate the thermostat
-
bration-free inside wall. Do not install the thermostat or dehu-

Drafts, or dead spots behind doors, in corners, or under
cabinets.
Hot or cold air from registers.
Radiant heat from the sun.


Concealed hot or cold water pipes, or chimneys.
Unconditioned areas behind the thermostat and
dehumidistat, such as an outside wall.
Consult the instructions packaged with the thermostat and de-
humidistat for mounting instructions and further precautions.



-



Improved construction and additional insulation in build-

escape around doors and windows. These changes have
helped in reducing heating/cooling costs but have created
a problem supplying combustion and ventilation air for gas


etc.) increase the problem by starving appliances for air.