18-CD30D1-12
39
Installer’s Guide
START-UP AND ADJUSTMENT
PRELIMINARY INSPECTIONS
▲
WARNING
!
ELECTRICAL SHOCK HAZARD
Disconnect power to the unit before removing the
blower door. Allow a minimum of 10 seconds for IFC
power supply to discharge to 0 volts.
Failure to follow this warning could result in property
damage, personal injury or death.
NOTE: The condensate trap must be primed before
operation.
With gas and electrical power “OFF”
1. Duct connections are properly sealed.
2. Filters are in place.
3. Venting is properly assembled.
4. Blower door is in place.
Turn the main Gas Valve toggle switch (See Figure 59)
within the unit to the “
OFF
” position. Turn the external
shutoff valve to the “
OPEN
” position (See Figures 50 and
52). Purge the air from the gas lines. After purging, check
all gas connections for leaks with a soapy solution —
DO
NOT CHECK WITH AN OPEN FLAME.
Allow 5 minutes
REINSTALLATION OF THE BURNER BOX COVER
Figure 55 shows the correct way to reinstall the Burner
Box cover if adjustment or replacement of the Flame
Sensor, Hot Surface Igniter, or Main Burner orifices have
required removal of the cover.
T
ROTATE THE FRONT
COVER INWARD MAK-
ING SURE THAT ALL SIDE
FLANGES ARE OUTSIDE
OF THE BOX.
INSERT THE TOP FLANGE
OF THE FRONT COVER
UNDER THE LIP INSIDE
THE BOX
ALL SIDE FLANGES MUST
BE OUTSIDE OF THE BOX
ROTATE THE FRONT
COVER AS SHOWN
NOTE:
Natural gas units should not have any yellow tipped
flames. This condition indicates that a service call is
required. For best operation, burners must be cleaned
annually using brushes and vacuum cleaner.
for any gas that might have escaped to dissipate. LP Gas
being heavier than air may require forced ventilation. Turn
the toggle switch on the Gas Valve in the unit to the “ON”
position.
All soap solution should be cleaned off gas piping after
gas leak testing is complete.
LIGHTING INSTRUCTIONS
▲
WARNING
!
FIRE OR EXPLOSION HAZARD
Do NOT attempt to manually light the burner.
Failure to follow this warning could result in property
damage, personal injury or death.
▲
CAUTION
!
Whenever your house is to be vacant, arrange
to have someone inspect your house for proper
temperature. This is very important during freezing
weather. If for any reason your furnace should fail to
operate damage could result, such as frozen water
pipes.
Lighting instructions appear on each unit. Each
installation must be checked out at the time of initial start
up to insure proper operation of all components. Check
out should include putting the unit through one complete
cycle as outlined below.
Turn on the main electrical supply and set the Comfort
Control above the indicated temperature. The Ignitor will
automatically heat, then the Gas Valve is energized to
permit the flow of gas to the burners. After ignition and
flame is established, the Flame Control Module monitors
the flame and supplies power to the Gas Valve until the
Comfort Control is satisfied.
TO SHUT OFF
For complete shutdown: Turn the Gas Valve toggle switch
on the main Gas Valve to the “OFF” position (See Figures
59). Disconnect the electrical supply to the unit.
▲
CAUTION
!
If complete shutdown is done during the cold
weather months, provisions must be taken to prevent
freeze-up of all water pipes and water receptacles.
