StyleCrest Installation Manual

19
WARNING:
Before placing the furnace in service, it must be
checked to ensure it is equipped for the type of gas
being used. The burner flame must be observed
and adjusted if necessary. Failure to observe this
caution may result in unsafe operation, explosion
and/or fire, or asphyxiation. See the Gas Supply
and Combustion Air sections.
• The first operation of the furnace after any home
setup must be performed by a qualified service
technician.
• BEFORE STARTUP: Smell all around the furnace for
gas and next to the floor. Some gas is heavier than air
and may settle on the floor.
• Do not use this furnace if any part has been under
water. Immediately call a service technician to inspect
the furnace and to replace any part of the gas valve or
control system which has been under water.
WARNING:
Close the hinged fire door. If door is left open
or spring is broken it may allow products of
combustion into the living space by the furnace
blower, resulting in possible asphyxiation.
WARNING:
Should overheating occur, or the gas supply fails
to shut off, shut off the manual gas valve to the
furnace before shutting off the electrical supply.
AVERTISSEMENT :
En cas de surchauffe, ou si l’alimentation de gaz
omet de s’arrêter, fermez le robinet de gaz manuel
à la fournaise avant de couper l’alimentation
électrique.
Operating Instructions
(Direct Ignition Furnaces)
Direct ignition furnaces do not have a pilot. Ignition is
accomplished by a hot surface ignitor. A circuit board
takes care of all timing functions. After lighting, the circuit
board uses the ignitor as a flame sensor, shutting off gas
should the flame go out. There are no external relays or
timing devices. Do not try to light this furnace by hand.
The circuit board is not field serviceable.
1. Set the thermostat to the lowest setting.
2. Turn off all electric power to the appliance.
3. Remove the furnace door and turn off the gas valve.
Push in and turn the gas control knob clockwise to OFF.
See Figure 28 (page 20).
4. Wait ten (10) minutes to clear out any gas. If you smell
gas, STOP! and follow the Safety Information. If you
do not smell gas, proceed to step 5.
5. Set the thermostat MODE the ON position.
6. Turn the gas valve ON. Push in and turn gas control
knob counter-clockwise to ON (Figure 28).
7. Replace the furnace door.
8. Turn on all electric power to the appliance.
9. Change the thermostat mode to HEAT and the
temperature selector to a desired temperature level.
The igniter should light in approximately 75 seconds.
If the appliance will not operate, see “How to Shut Off
Gas - Direct Ignition” on page 19 and call your service
technician or gas supplier.
NOTE: In the event of any flashback or explosion,
immediately shut off the furnace and call your service
technician.
How to Shut Off Gas - Direct Ignition Models
1. Set the thermostat to the lowest setting.
2. Turn off all electric power to the appliance before
servicing unit.
3. Set the furnace On-Off Switch to OFF.
4. Turn gas control knob clockwise to OFF (Figure 28).
5. Replace the furnace door.
Verifying Input Rate
IMPORTANT NOTE:
The input rate must not exceed the rate shown on the
furnace rating plate. At altitudes above 2,000 feet, it
must not exceed that on the rating plate less 4% for
each 1,000 feet.
The input rate must be verified for each installation to
prevent over-firing of the furnace. To determine the exact
input rate, perform the following procedures:
1. Shut off all other gas fired appliances.
2. Start the furnace and run it for at least 3 minutes.
3. Measure the time (in seconds) required for the gas
meter to complete one revolution.
4. Convert the time per revolution to cubic feet of gas per
hour using Table 8, (page 23).
5. Multiply the gas flow rate in cubic ft per hr by the heating
value of the gas in Btu per cubic ft to obtain the input
rate in Btuh. See example.
Example:
• Time for 1 revolution of a gas meter with a 1 cubic ft
dial = 40 seconds.
• From Table 8 read 90 cubic ft gas per hr.
• Local heating value of the gas (obtained from gas
supplier) = 1,040 Btu per cubic ft.
• Input rate = 1,040 x 90 = 93,600 Btuh.
6. The manifold pressure must be verified for each
installation by a qualified installer, service agency or
the gas supplier. See page 18.
Verifying & Adjusting Temperature Rise
Confirm the temperature rise through the furnace is
within the limits specified on the furnace rating plate. Any
temperature rise outside the specified limits could result
in premature failure of the heat exchanger.
1. Place thermometers in the return and supply air stream
as close to the furnace as possible. To avoid false