Honeywell Design and Application User Manual

Section 6 - W7459 Economizer Module
63-8594-02 Honeywell Economizers 54
W7459 Enthalpy Module Components
The W7459 is used in conjunction with a
Honeywell actuator (M7415) and sensors to
control outdoor and return air dampers free
cooling using outside air. It is designed to be
installed directly on the actuator.
The W7459 was used with Honeywell C7400A
enthalpy, C7650 or C7660 dry bulb
temperature sensors and the M7415, M7405,
and M8405 actuators. It had to be installed in
free flowing air yet out of direct rain or sunlight.
It can be used as a single or differential
enthalpy control. A minimum position
potentiometer is built into all W7459 modules
except for the W7459C since the M8405
actuator, that it is used with, has the setting
built-in. All W7459 modules can be used with
remote minimum position potentiometers. See
Table 1 for model capability with motors.
DAMPER
M23907
DAMPER
RETURN AIR
FROM ROOM
SUPPLY
AIR TO
BUILDING
MIXED AIR
SENSOR
FAN
COILS
S
+
S
+
W7459 ENTHALPY CONTROL
TR
TR1
A
B C
D
S
O
S
R
+
+
5
2
4
T1
P1
1
3
T
P
MINIMUM
POSITION
OPEN
DAMPER
LINKAGE
M7415 DAMPER ACTUATOR
WITH W7459 ENTHALPY
CONTROLLER
OUTSIDE
AIR SENSOR
EXHAUST
AIR
RETURN AIR
SENSOR
TB8220
COMMERCIAL
PRO
M13837A
W7459
ENTHALPY
CONTROL
MODULE
M7415, M7405
OR M8405
ACTUATOR
TR
TR1
T
T1
P1
P
MOTOR
TERMINALS

Honeywell Design and Application Specifications

General

Brand	Honeywell
Model	Design and Application
Category	Controller
Language	English