In the U.S.: Per the NFGC, any listed power venter may be used,
when approved by the authority having jurisdiction.
In Canada: Only power venters approved by the appliance
manufacturer and where allowed by the authority having jurisdic-
tion may be used for sidewall venting.
The only approved power venter is the Field Controls SWG-4D
and SWG-5D sidewall power venter. Select the power venter to
match the btuh input of the appliance being vented. Follow all
manufacturer’s installation requirements for venting and termina-
tion included with the power venter.
START-UP, ADJUSTMENT, AND SAFETY CHECK
Step 1—General
This furnace is equipped with manual reset limit switches in
the gas control area. The switches open and shut off power to
the gas valve, if a flame rollout or overheating condition
occurs in the gas control area. DO NOT bypass the switches.
Correct problem and reset the switches.
1. Maintain 115-v wiring and ground. Improper polarity will
result in rapid flashing LED and no furnace operation.
2. Make thermostat wire connections at the 24-v terminal block
on the furnace control. Failure to make proper connections
will result in improper operation. (See Fig. 22.)
3. Gas supply pressure to the furnace must be greater than 4.5-in.
wc (0.16 psig ) but not exceed 14-in. wc (0.5 psig ).
Personal injury can result form sharp metal edges, etc. Be
careful when removing parts. Gloves and safety glasses
should be worn when servicing equipment.
4. Check all manual-reset switch for continuity.
5. Replace blower compartment door. Door must be in place to
operate furnace.
6. Setup switch descriptions
The variable speed furnace control has DIP switches to select
thermostat staging, blower off delay timings, air flow selection
and other operational or service related functions. See Fig. 32,
51 and Table 6.
Step 2—Start-Up Procedures
Never purge a line into a combustion chamber. Never use
matches, candles, flame, or other sources of ignition for the
purpose of checking leakage. Use a soap-and-water solution
to check for leakage. Failure to follow this warning can cause
fire, explosion, personal injury, or death.
1. Purge gas lines after all connections have been made.
2. Check gas lines for leaks.
Blower access door switch opens 115-v power to control. No
component operation can occur unless switch is closed.
Caution must be taken when manually closing this switch for
service purposes. Failure to follow this warning could result
in electrical shock, personal injury, or death.
3. To Begin Component Self-Test:
Remove Blower Access Door. Disconnect the thermostat R
lead from from furnace control board. Manually close blower
door switch. Turn Setup DIP switch SW1-6 ON. See Fig. 32,
51 and Table 6.
NOTE:
The furnace control allows all components, except the gas
valve, to be run for short period of time. This feature helps
diagnose a system problem in case of a component failure.
Component test feature will not operate if any thermostat signal is
present at the control.
Component test sequence is as follows for variable speed furnace:
Refer to service label attached to furnace or See Fig. 50.
a. Inducer motor starts on high-speed and continues to run
until Step 4 of component test sequence.
b. Hot surface igniter is energized for 15 sec., then off.
c. Blower motor operates for 15 sec.
d. Inducer motor goes to low-speed for 10 sec., then stops.
e. After component test is completed, one or more status
codes (11, 25, or 41) will flash. See component test section
of service label (Fig. 50) in furnace for explanation of fault
codes.
Table 6—Furnace Setup Switch Description
SETUP
SWITCH NO.
SWITCH
NAME
NORMAL
POSITION
DESCRIPTION
OF USE
SW1-1
Status Code Recovery
OFF
Turn ON to retrieve up to 7 stored status codes for troubleshooting
assistance when R thermostat lead is disconnected.
SW1-2
Adaptive Heat Mode
OFF
Allows 2-stage operation with a single stage thermostat.
Turn ON when using 2 stage thermostat to allow Low Heat opera-
tion when R to W/W1 closes and High Heat operation when R to
W/W1 and W2 close.
SW1-3
Low Heat
Rise Adjust
OFF
Turn ON to increase Low Heat airflow by 18 percent. This compen-
sates for increased return air temperature caused with bypass hu-
midifier.
SW1-4
Comfort/Efficiency Adjustment
ON
Turn ON to decrease Low Heat airflow by 16 percent and High Heat
airflow 10 percent for maximum comfort.
SW1-5
CFM per ton adjust
OFF
Turn ON for 400 CFM per ton. Turn OFF for 350 CFM per ton.
SW1-6
Component Self-Test
OFF
Turn ON to initiate Component Self-Test for troubleshooting assis-
tance when R thermostat lead is disconnected.
Turn OFF when Self-Test is completed.
SW1-7
Blower OFF delay
ON or OFF
Control blower Off Delay time. Used in conjunction with SW1-8. See
Table 8.
SW1-8
Blower OFF delay
ON or OFF
Control blower Off Delay time. Used in conjunction with SW1-7. See
Table 8.
28
→