507330-01B
Page 24 of 33
Issue 1809
Unit Start-Up
FOR YOUR SAFETY, READ BEFORE LIGHTING UNIT
Do not use this furnace if any part have been
underwater. Immediately call a licensed professional
service technician (or equivalent) to inspect the furnace
and to replace any part of the control system and any
gas control which has been underwater.
WARNING
If overheating occurs or if gas supply fails to shut off,
shut off the manual gas valve to the appliance before
shutting off electrical supply.
WARNING
Before attempting to perform any service or
maintenance, turn the electrical power to unit OFF at
disconnect switch.
CAUTION
Figure 32. Integrated Control
(Automatic Hot Surface Ignition System)
Terminal Designations
120 HUM
Humidifier (120 VAC)
LINE
Input (120 VAC)
XFMR
Transformer (120 VAC)
CIRC
Indoor Blower (120 VAC)
EAC
Electronic Air Cleaner (120 VAC)
COOL
Blower - Cooling Speed (24 VAC)
HEAT
Blower - Heating Speed (24 VAC)
FAN
Blower - Fan Speed (24 VAC)
PARK
Dead terminals to park all speed taps
NEUTRALS
Neutral Terminals (120 VAC)
FS
Flame Sense
24 COM
Common (24 VAC)
HUM 24
Humidifier (24 VAC)
RED LED RECALL BUTTON
BLOWER OFF DELAY
Figure 33. Heating Sequence of Operation
Demand
15
ON
OFF
CAI
35
1
Pre-Purge
Ignitor Warm-up
Blower
“On” Delay
Post
Purge
5 SEC
80
Ignitor
Gas Valve
Indoor Blower
39
Trial for
Ignition
Blower on time will be 45 seconds after gas valve is energized. Blower off time will depend on “OFF TIME” Setting.
