Honeywell Design and Application User Manual

Section 4 - H705 Economizer Module
63-8594-02 Honeywell Economizers 46
H705A used in electronic system
H705A used in electromechanical system
L1
(HOT)
L2
1
L1
(HOT)
L2
S963A OR Q209
MINIMUM POSITION
POTENTIOMETER
M745
ECONOMIZER
MOTOR
1
3
TR
TR
1
2
3
4
RW
WR B
E1
T1
E2
E3
TR1
W936 OR W945
ELECTRONIC PANEL
OPTIONAL
MORNING
WARMUP
COMMERCIAL
THERMOSTAT
TR
SR
2
1
3
S
2
TR
TR
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS
REQUIRED.
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD BE
REMOVED ONLY IF A C7400A SENSOR IS ADDED TO SR AND + FOR
DIFFERENTIAL ENTHALPY.
ENSURE THAT EQUIPMENT TRANSFORMER IS SIZED TO HANDLE
THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR.
3
OPTIONAL
C7400A
H705A
1
2
620
OHMS
M15037C
L1
(HOT)
L2
61
4
2
2
2
YELLOW
BLUE
YELLOW
VIOLET
BROWN
VIOLET
BLACK/BLUE BLACK/RED
WHITE/RED
BLACK/YELLOW
RED
3 3 3
2ND STAGE
COOLING
CONTACTOR
1ST STAGE
COOLING
CONTACTOR
COOLING
TRANSFORMER
3
Y1
B1
W1
R1
Y G C R
Y2
RC
TR1
TR
SR
2
1
3
S
5
PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
FIELD CONTROL WIRING REQUIRED TO INTEGRATE
ECONOMIZER INTO UNIT.
FIELD WIRING REQUIRED TO PROVIDE ECONOMIZER AND
MECHANICAL COOLING OPERATION IN EXISTING INSTALLATION.
ROOFTOP TERMINAL STRIP IS PART OF AIR CONDITIONING UNIT.
FACTORY-INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD BE
REMOVED ONLY IF A C7400A SENSOR IS ADDED TO SR AND + FOR
DIFFERENTIAL ENTHALPY.
ENSURE THAT EQUIPMENT TRANSFORMER IS SIZED TO HANDLE
THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR.
4
5
6
OPTIONAL
C7400A
W859D ECONOMIZER
CONTROL PACKAGE
1
2
3
620
OHMS
M12162A
MODUTROL®
MOTOR
H705A
T872 SPACE
THERMOSTAT
(COOLING
CIRCUIT)

Honeywell Design and Application Specifications

General

Brand	Honeywell
Model	Design and Application
Category	Controller
Language	English