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Installation Instructions
11 Start-Up, Adjustment, and Safety Check
11.1 General
WARNING: FIRE HAZARD
This furnace is equipped with manual reset limit switches
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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 inadequate combustion air supply
problem before resetting the switches.
CAUTION: CUT HAZARD
Sheet metal parts may have sharp edges or burrs. Use care
f
and wear appropriate protective clothing, safety glasses,
and gloves when handling parts and servicing furnaces.
1.
Maintain 115V wiring and ground. Improper polarity will result in rapid
flashing LED and no furnace operation (See Fig. 37).
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. 37).
3.
Gas supply pressure to the furnace must follow Table 14 "Inlet Gas Supply
Pressure" in Section 9.1.
4.
Check all manual-reset switches for continuity.
5.
Install blower and burner access panels. Panels must be in place to operate
furnace.
11.2 Start-Up Procedures
WARNING: FIRE AND EXPLOSION HAZARD
Never test for gas leaks with an open flame. Use a
f
commercially available soap solution made specifically for
the detection of leaks to check all connections.
1.
Purge gas lines after all connections have been made.
2.
Check gas lines for leaks.
WARNING: ELECTRICAL SHOCK HAZARD
Blower access panel switch opens 115V power to control.
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No component operation can occur unless the switch is
closed. Caution must be taken when manually closing this
switch for service purposes.
4 6 |
3.
This furnace is also equipped with a self-diagnosing electronic control
module. In the event a furnace component is not operating properly，
the control module LED will flash on and off in a factory programmed
sequence， depending on the problem encountered. This light can be
viewed through the observation window in the blower access panel. Refer
to the Troubleshooting Chart on pages 50-51 for further explanation of
the lighting codes. Follow the start-up and adjustment items in Section
11.，Refer to Section 12 for further information on Operational Checks.
11.3 Furnace Start-Up
1.
Close the manual gas shutoff valve external to the furnace.
2.
Turn off the electrical power to the furnace.
3.
Set the room thermostat to the lowest possible setting.
4.
Remove the burner access panel.
WARNING:
This furnace is equipped with an ignition device which
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automatically lights the burner. Do not try to light the
burner by hand.
5.
Push the gas valve switch to the OFF position.
6.
Wait five minutes to clear out any gas. Then smell for gas， including near the
floor.
7.
If gas can be smelled following the five minute waiting period, repeat step 6.
If you have waited more than 10 minutes and still smell gas, check for leaks
using a soap and water solution.
8.
If you do not smell gas after five minutes, push the gas valve switch to the
ON position.
WARNING: FIRE AND EXPLOSION HAZARD
Never test for gas leaks with an open flame. Use a
f
commercially available soap solution made specifically for
the detection of leaks to check all connections.
9.
Replace the burner access panel on the front of the furnace.
10.
Open the manual gas valve external to the furnace.
11.
Turn on the electrical power supply to the furnace.
12.
Set the room thermostat to slightly above room temperature. After some
delay, the furnace will start.
13.
Refer to Section 11.4 "Sequence of Operation" for specific details on how
the furnace operates.
There is an approximate 48 second delay between thermostat energizing
and burner firing.
Bosch 96% AFUE Condensing Gas Furnace - BTC 770503101 J (06.2023)
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