Honeywell W7459 - Page 13

SOLID STATE ECONOMIZER SYSTEM
13 63-2484—03
C7660 Solid State Temperature Sensor
The C7660 Solid State Temperature Sensor is used with a
solid state economizer control and damper actuator to
proportion an outdoor air damper in a ventilation system.
When outdoor air temperature is higher than changeover set
point, the outdoor air damper closes to the minimum position.
When the outdoor air temperature is below the changeover
set point, the outdoor air damper proportions open on a call
for cooling.
The dip switch settings for the C7660 Sensor are shown in
Fig. 21.
Fig. 18. Partial psychrometric chart with single C7400A Solid State Enthalpy Sensor and W7212A or W7459 Solid State
Economizer Logic Module performance curves.
CONTROL
CURVE
A
B
C
D
CONTROL POINT
APPROX. °F (°C)
AT 50% RH
73 (23)
70 (21)
67 (19)
63 (17)
12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46
90
100
80
70
60
50
40
30
20
10
ENTHALPY—BTU PER POUND DRY AIR
85
(29)
90
(32)
95
(35)
100
(38)
105
(41)
110
(43)
35
(2)
35
(2)
40
(4)
40
(4)
105
(41)
110
(43)
45
(7)
45
(7)
50
(10)
50
(10)
55
(13)
55
(13)
60
(16)
60
(16)
65
(18)
65
(18)
70
(21)
70
(21)
75
(24)
75
(24)
80
(27)
80
(27)
85
(29)
90
(32)
95
(35)
100
(38)
APPROXIMATE DRY BULB TEMPERATURE— °F (°C)
A
A
B
B
C
C
D
D
M11160D
RELATIVE HUMIDITY (%)
1
1
HIGH LIMIT CURVE FOR W7210D, W7212A, W7213, W7214, W7340B.