Honeywell Design and Application User Manual

Section 4 - H705 Economizer Module
63-8594-02 Honeywell Economizers 42
H705 Economizer Module
The H705 was the first Honeywell series of
electronic economizer controllers. Prior to the
development of the H705, an
electromechanical device with a nylon
humidity element, the H205, was the state-of-
the-art controller. The H705 was a direct
replacement for the H205. The output is the
same SPDT switch which is typically wired into
the mixed air circuit.
DAMPER
M23914A
DAMPER
RETURN AIR
FROM ROOM
SUPPLY
AIR TO
BUILDING
SUPPLY OR
MIXED AIR
SENSOR
FAN
COILS
H705 ENTHALPY CONTROL
OUTSIDE
AIR SENSOR
EXHAUST
AIR
TR
TR1
A
BC
D
S
O
S
R
+
+
2
4
X
D
1
3
6
5
DAMPER
ACTUATOR
T1
MOD-HEAT
MOD-COOL
HEAT
3 HEAT 3 COOL
HEAT21
21
SENSOR STAT
C+20H H
T
34251
TR TR W B Y R
WCBCRC
RHBHWH
24 VAC ECONO
SINGLEZONE CONTROL
COOL SETPOINT 76˚F (24 C)
ROOM SENSOR
MINIMUM POSITION
CONTROL. PREVENTS
FULL CLOSURE OF
OUTSIDE AIR DAMPERS
60
100
140
120
80
40
°F

Honeywell Design and Application Specifications

General

Brand	Honeywell
Model	Design and Application
Category	Controller
Language	English