48
A99118
Fig. 48 -- Inducer Housing Drain Cap
This furnace can be installed with either a single-stage heating or
a 2-stage heating thermostat.
For single-stage thermostats, connect thermostat W to W/W1 at
furnace control terminal block. (See Fig. 31). For single-stage
thermostats, the control will determine, based on length of
previous heating on and off cycles, when to operate in low- and
high-gas heat for optimum comfort. Setup switch-SW-1 (LHT)
must be in the factory-shipped OFF position. See Fig. 36 and
Tables 13 and 14 for setup switch information.
If a 2-stage heating thermostat is to be used, move SW-1 to ON
position at end of furnace installation. This overrides built-in
control process for selecting high and low fire and allows the
2-stage thermostat to select gas heating modes. The W2 from
thermostat must be connected to W2 on control terminal block.
(See Fig. 32 and 50 -- 57.)
Before operating furnace, check each flame rollout manual reset
switch for continuity. If necessary, press and release button to
reset switch. The blower compartment door must be in place to
complete the 115-v circuit to the furnace.
FIRE HAZARD
Failure to follow this caution may result in intermittent unit
operation.
This furnace is equipped with a manual reset limit switch in
the burner box area. The switch will open and shut off power
to the gas valve if a flame rollout or overheating condition
occurs in the burner enclosure area. DO NOT bypass the
switch. Correct inadequate combustion-air supply, component
failure, or restricted flue gas passageway before resetting
the switch.
CAUTION
!
A99119
Fig. 49 -- Filling Condensate Trap
Step 2 -- Prime Condensate Trap With Water
FURNACE MAY NOT OPERATE
Failure to follow this caution may result in intermittent unit
operation.
Condensate trap must be PRIMED or proper draining may not
occur. The condensate trap has internal chambers which can
ONLY be primed by pouring water into the inducer drain side
of condensate trap.
CAUTION
!
1. Remove upper inducer housing drain connection cap. (See
Fig. 48.)
2. Connect field-supplied 1/2-in. (13 mm) ID tube to upper
inducer housing drain connection.
3. Insert field-supplied funnel into tube.
4. Pour 1 quart of water into funnel/tube. Water should run
through inducer housing, overfill condensate trap, and
flow into open field drain. (See Fig. 49.)
5. Remove funnel and tube from inducer housing and replace
drain connection cap and clamp.
Step 3 -- Purge Gas Lines
After all connections have been made, purge the gas lines and
check for leaks.
58MEC
