Honeywell Design and Application User Manual

Section 6 - W7459 Economizer Module
59 Honeywell Economizers 63-8594-02
W7459A Wiring Diagram
S
+
60
180
90
170
16
15
140
130
120
110
100
F
80
70
R
G
W1
W2
Y1
C
RC
RH
G
W1
W2
Y2
Y1
S
+
3
1
2
42K
1K
1S
1S SWITCHES
WHEN
POWERED BY
24 VOLTS
1S1
MINIMUM POSITION
ADJUSTMENT
T
T1
P1
P
MINIMUM
POSITION
P
P1
T1
T
MIXED AIR
SENSOR
TR1
TR
1
TR TR1
S
O
S
R
5
+
+
C7150 OR C7046
MIXED OR SUPPLY
AIR SENSOR
C7400 RETURN AIR
ENTHALPY SENSOR
C7400 OURDOOR AIR
ENTHALPY SENSOR
TRANSFORMER
COOL1
HEAT 2
HEAT 1
FAN DELAY
FAN
FDR
Y2
COOL2
COMMERCIAL
THERMOSTAT
LOW O.A. AMBIENT
COMPRESSOR
LOCKOUT STAT
(OPTIONAL)
R W
1
HVAC EQUIPMENT TERMINAL STRIP
M7415 ACTUATOR
W7459A ECONOMIZER MODULE
24 VAC
RELAYS 1K AND 2K ENERGIZE
IF OUTDOOR ENTHALPY
EXCEEDS RETURN AIR ENTHALPY
M13819A
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.

Honeywell Design and Application Specifications

General

Brand	Honeywell
Model	Design and Application
Category	Controller
Language	English