W7459A Wiring Diagram - Honeywell Design and Application Technical Reference Manual

W7459A ECONOMIZER MODULE
C7400 OURDOOR AIR
ENTHALPY SENSOR
+
S
+
S
C7400 RETURN AIR
ENTHALPY SENSOR
1S SWITCHES
WHEN
POWERED BY
24 VOLTS
C7150 OR C7046
MIXED OR SUPPLY
AIR SENSOR
Y1
Y2
W2
W1
G
RH
RC
COMMERCIAL
THERMOSTAT
1 HONEYWELL RECOMMENDS USE OF A SINGLE LARGE TRANSFORMER FOR BOTH THE ECONOMIZER LOGIC MODULE
AND THE COOLING COMMERCIAL THERMOSTAT CIRCUIT.
2 WHEN THE SUPPLY FAN IS POWERED, THE ECONOMIZER IS POWERED AND THE DAMPER IS POSITIONED TO
MINIMUM POSITION. TAKE CAUTION WHEN USING THIS CONTROL SEQUENCE ON NEWER ECONOMIZERS WITH
MICROPROCESSOR CONTROL. DO NOT POWER THE MICROPROCESSOR ECONOMIZERS FROM THE SUPPLY FAN,
THEY NEED CONSTANT POWER.

W7459A Wiring Diagram

RELAYS 1K AND 2K ENERGIZE
IF OUTDOOR ENTHALPY
EXCEEDS RETURN AIR ENTHALPY
1S
1K
2K
1S1
MINIMUM POSITION
ADJUSTMENT
LOW O.A. AMBIENT
COMPRESSOR
LOCKOUT STAT
(OPTIONAL)
R W
120
F
110 130
100
140
90
15
80
16
70
170
60 180
59
Section 6 - W7459 Economizer Module
M7415 ACTUATOR
TR TR1 TR
S O
+
TR1
S R
+
5
2
1
3
4
T T1
P1
P
HVAC EQUIPMENT TERMINAL STRIP
TRANSFORMER
1
C
Y1
Y2
W2
W1
G
FDR
R
1
24 VAC
T
MIXED AIR
SENSOR
T1
P1
MINIMUM
POSITION
P
COOL1
COOL2
HEAT 2
HEAT 1
FAN DELAY
FAN
M13819A
Honeywell Economizers 63-8594-02