Bryant Preferred 551J Service And Maintenance Instructions page 35

LEGEND
DCV — Demand Controlled Ventilation
IAQ — Indoor Air Quality
LA — Low Ambient Lockout Device
OAT — Outdoor Air Temperature
POT — Potentiometer
RAT — Return Air Temperature
RUN
DIRECT DRIVE
ACTUATOR
NOTES:
1. Switch on actuator must be in run position for economizer to operate.
FOR OCCUPANCY CONTROL
REPLACE JUMPER WITH
FIELD-SUPPLIED TIME CLOCK
8
7
Fig. 43 — EconoMi$er IV Wiring
500 OHM
RESISTOR
ORANGE
Fig. 44 — EconoMi$er2 with 4 to 20 mA Control Wiring
Potentiometer Defaults Settings:
Power ExhaustMiddle
Minimum Pos.Fully Closed
DCV Max.Middle
DCV SetMiddle
EnthalpyC Setting
NOTES:
1. 620 ohm, 1 watt 5% resistor should be removed only when using
differential enthalpy or dry bulb.
2. If a separate field-supplied 24 v transformer is used for the IAQ
sensor power supply, it cannot have the secondary of the trans-
former 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.
VIOLET
PINK
OAT SENSOR
4-20mA SIGNAL
2. 50HJ540573 actuator consists of the 50HJ540567 actuator and a
harness with 500-ohm resistor.
35
BLACK
4 TRANSFORMER
GROUND
3
5
BLUE
2
8
6
7
ACTULATOR
RED
FEEDBACK
1
(2-10VDC)
10
11
9
ACTULATOR
WHITE
CONTROL
12
(4-20mA)
ECONOMI$ER2 PLUG