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TYPICAL WIRING SCHEMATICS — 549B, 549C (cont)
EconoMi$erIV Wiring — 549B036-120, 549C024-060
LEGEND
IAQ — Indoor Air Quality
LA — Low Ambient Lockout Device
POT— Potentiometer
OAT— Outdoor-Air Temperature
RAT— Return-Air Temperature
NOTE:
Potentiometer Defaults Settings:
Power Exhaust Middle
Minimum Pos. Fully Closed
DCV Max. Middle
DCV Set Middle
Enthalpy C Setting
NOTES:
1. 620 ohm, 1 watt 5% resister should be removed only when using differen-
tial enthalpy or dry bulb.
2. If a separate field-supplied 24v transformer is used for the IAQ sensor
power supply, it cannot have the secondary of the transformer grounded.
3. For field-installed remote minimum position POT, remove black wire jumper
between P and P1 and set control minimum position POT to the minimum
position.
4
3
5
2
8
6
7
1
10
11
9
12
PINK
VIOLET
BLACK
BLUE
YELLOW
NOTE 1
NOTE 2
RUN
500 OHM
RESISTOR
-
+
OPTIONAL CO
SENSOR 4 - 20 mA
OUTPUT
50HJ540573
ACTUATOR
ASSEMBLY
RED
WHITE
ECONOMISER2 PLUG
DIRECT DRIVE
ACTUATOR
2
NOTES:
1. Switch on actuator must be in run position for economizer to operate.
2. 50HJ540573 actuator consists of the 50HJ540567 actuator and a harness with 500-ohm resistor.
EconoMi$er2 Wiring — 549B036-120, 549C024-060
a48-7910
a50-8053
549B, 549C