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16.0 OPTIONAL ACCESSORIES (FIELD SUPPLIED/
INSTALLED)
16.1
ELECTRONIC AIR CLEANER
The integrated furnace control has provisions to supply power and control an electronic air cleaner rated at
120VAC, 1.0 amp max. 120 volt power will be available at these terminals whenever the
circulating fan is operating in the heating or cooling fan modes.
16.2
POWER HUMIDIFIER
The integrated furnace control has provisions to supply power and control a line voltage humidifi er or the
primary of a 120 / 24 volt humidifi er step down transformer, rated at 120VAC, 1.0 amp max.
NOTE
All HUM and EAC terminals are 120V. Do not directly connect 24V equipment to these terminals.
17.0 INITIAL START-UP PROCEDURES
This furnace is equipped with a HSI (Hot Surface Ignition) device. Each time that the room thermostat calls for
heat, the HSI lights the main burners directly. See the lighting instructions on the furnace.
When the gas supply is initially connected to the furnace, the gas piping may be full of air. Follow the instructions
contained in the natural gas and propane installation codes to properly purge the gas supply line. Test the af-
fected joints to ensure there are no leaks. Allow fi ve minutes for any gas to dissipate before continuing with the
start-up procedure. Be sure proper ventilation is available to dilute and carry away any vented gas.
During initial start-up, it is not unusual for odor to come out of any room register. To ensure proper ventilation, it
is recommended to open windows and doors, before initial fi ring.
The furnace has a negative pressure switch that is a safety during a call for heat. The induced draft blower must
pull a negative pressure on the heat exchanger to close the negative pressure switch. The induce draft blower
must maintain at least the negative pressure switch set point for the furnace to operate. If the induced draft
blower fails to close or maintain the closing of the negative pressure switch, a "no heat call" would result.
NOTE
It is required/mandatory that the drain trap assembly be primed before the initial startup. Refer to the
instructions on how to prime the condensate trap on the drain piping section in this manual. A dry trap will
allow fl ue gases to fl ow through the recovery coil drain, which will prevent the condensate from draining
from the recovery coil. If enough condensate accumulates in the recovery coil, the recovery coil pressure
switch will sense this condition and break its electrical contacts, and extinguish combustion. If this takes
place, the induced blower will stop after a brief post-purge cycle, the condensate will drain out and fi ll the
trap. If the thermostat is still calling for heat, the ignition sequence will start again after a 5 minute wait.
17.1
TO START THE FURNACE
1. Shut off the electrical power to the furnace and set the room thermostat to its lowest setting.
2. Remove the burner compartment access door.
IMPORTANT
:
ENSURE THAT THE MANUAL GAS VALVE SWITCH HAS BEEN IN THE "OFF" POSITION
FOR AT LEAST 5 MINUTES. DO NOT ATTEMPT TO MANUALLY LIGHT THE MAIN
BURNERS.
3. Turn the gas valve switch to the "ON" position.
4. Replace the burner compartment access door.
5. Turn on furnace appliance shut off valve.
6. Restore electrical power to the furnace.
7. Set the room thermostat to a point above room temperature to light the furnace.
8. After the burners are lit, set the room thermostat to the desired temperature.
H20.1.1
H20.2
H21.0B
H21.1
W415-2306 / C / 09.22.20
45
IOM
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