Honeywell Design and Application User Manual

Section 4 - H705 Economizer Module
47 Honeywell Economizers 63-8594-02
4
7
5
1
4
4
3
6
L1
(HOT)
L2
9
W1
Y1
Y2
W2
G
W1
R1
B1
T2
T1
B
R
W
WR B
R
W2
Y2
C2
H2
C1
H1
Y1
W1
G
A1
A2
X
TR1
TR
SR
RH
RC
2
1
3
S
2
POWER SUPPLY. 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.
ENTHALPY CONTROL MAKES TERMINALS 2-1 ON
ENTHALPY RISE, AND 2-3 ON ENTHALPY FALL.
RELAY REQUIRED (R8222 OR SIMILAR).
ECONIMIZER MOTOR SPRING RETURNS CLOSED ANY TIME
FAN IS NOT RUNNING.
FIELD INSTALLED JUMPER.
IMPORTANT: MIXED AIR SENSOR MUST BE LOCATED
DOWNSTREAM OF THE EVAPORATOR COIL IN THE DISCHARGE
AIR DUCT TO PROVIDE ECONOMIZER LOW LIMIT FUNCTION.
24 VAC ONLY.
MUST BE ABLE TO CARRY ADDITIONAL 6 VA LOAD OF
COMMERCIAL THERMOSTAT AND SUBBASE.
5
6
7
8
9
8
OPTIONAL
C7400A
EXISTING HVAC EQUIPMENT
TYPICAL W859D ECONOMIZER CONTROL PACKAGE
T675 LOW
AMBIENT
COMPRESSOR
LOCKOUT
1
2
3
4
620
OHMS
HEAT 1
HEAT 2
FAN
SYSTEM
TRANSFORMER
COOL 2
COOL1
M12167B
MODUTROL®
MOTOR
H705A
HVAC
EQUIPMENT
TERMINAL
STRIP
2K1
2K
1K
2K2
1K1
4K1
4K1
AUX
COM
LED 1
LED 2
3K
RISE
MIXED AIR
TEMPERATURE
CONTROLLER
1K2
OUTDOOR AIR
CHANGEOVER
SWITCH
WR B
OPEN
YELLOW
MINIMUM POSITION
POTENTIOMETER
BLUE
BLACK
BLACK/RED
BROWN
RED
BLACK/ YELLOW
T7300
THERMOSTAT
T7300
SUBBASE
L1
(HOT)
L2
VIOLET
VIOLET
YELLOW
FAN
T7300/Q7300 using W859D Economizer Package with H705A in two-stage
heating/two-stage cooling system, defeating economizer minimum position
during unoccupied periods

Honeywell Design and Application Specifications

General

Brand	Honeywell
Model	Design and Application
Category	Controller
Language	English