035-17480-000 Rev. A (800)
24
Unitary Products Group
ACCESSORY CONNECTIONS
The furnace control will allow power switching control of vari-
ous accessories (Refer to Figure 28.).
Electronic Air Cleaner Connection
Two 1/4” spade terminals (EAC and EAC N) for electronic air
cleaner connections are located on the control board. The
terminals provide 120 VAC (1.0 amp maximum) during circu-
lating blower operation.
Humidifier Connection
Two 1/4” spade terminals (HUM and HUM N) for humidifier
connections are located on the control board. The terminals
provide 120 VAC (1.0 amp maximum) during heat speed
operation of the circulating blower.
NOTE: EAC and HUM power leads are provided in the
junction box for easier installation.
FIGURE 27 :
Upflow Models (P*XU/G9D-UP) - Reading Gas Pressure
GAS
VALVE
U-TUBE
MANOMETER
BURNER BOX
WITH COVER
3.5 IN.
WATER COLUMN
GAS PRESSURE
SHOWN
BURNER BOX
PRESSURE
REFERENCE HOSE
OUTLET
PRESSURE
TAP
6
5
4
3
2
1
0
1
2
3
4
5
6
TEE
FITTING
WITH BURNER BOX COVER IN PLACE
6
5
4
3
2
1
0
1
2
3
4
5
6
GAS
VALVE
U-TUBE
MANOMETER
BURNER BOX
WITH COVER REMOVED
3.5 IN.
WATER COLUMN
GAS PRESSURE
SHOWN
BURNER BOX
PRESSURE
REFERENCE HOSE
(NOT USED)
OUTLET
PRESSURE
TAP
WITH BURNER BOX COVER REMOVED
Do not exceed 1.0 amp loading.
FIGURE 28 :
Accessory Connections
HUM
EAC
EAC
HUM
115 VOLT
ELECTRONIC
AIR CLEANER
EAC HOT
HUM HOT
BLK
BLK
WHI
WHI
115 VOLT
HUMIDIFIER
SWITCHED
CIRCUITS
NEUTRALS
