Honeywell W6215 Series, Данные о продукции, Страница: 8 / 28

W6215, W7215, W7460 ECONOMIZER LOGIC MODULES
63-2544—3 8
Differential Enthalpy Changeover Setting
Differential enthalpy control uses two C7400 Enthalpy
Sensors connected to one logic module. The logic module
compares outdoor air to return air instead of to a setpoint as it
does for single enthalpy. Turn the setpoint potentiometer fully
clockwise to the D setting. The logic module selects the lower
enthalpy air (return or outdoor) for cooling; for example, when
outdoor air has lower enthalpy than return air, the outdoor air
damper opens to bring in outdoor air for free cooling.
Exhaust Setpoint
Except for Purge, Shutdown, and Air Change, the exhaust
setpoint determines when the exhaust fan runs based on the
damper position. When the ISI call for exhaust comes, the
module provides a 45 ±15 second delay before exhaust fan
activation. This delay allows the damper to reach the
appropriate position to avoid unnecessary fan overload.
Adjustable Exhaust Setpoint
(W6215A, W7215A, and W7460A
only )
The W6215A, W7215A, and W7460A Logic Modules have an
adjustable setpoint. This potentiometer allows the installer to
set the exhaust setpoint at an actual damper position
percentage open from fully closed.
Fixed Exhaust Setpoint (W7215B and W7460B)
The W7215B and W7460B Logic Modules have a fixed
exhaust setpoint. The logic module uses an exhaust setpoint
of 60 percent. When the damper reaches 60 percent open
(from fully closed), the logic module calls for exhaust.
Fig. 6. W7215A used with Honeywell Series 90 Actuator.
Fig. 7. W6215, W7210, and W7460/C7400 performance characteristics for enthalpy changeover settings.
M11903A
TR TR1
W7215A
1
1
24 VAC HOT
24 VAC COM
2-10V
OUT
+
–
HONEYWELL
SERIES 90
ACTUATOR
(ML9175,
ML9185,
M9175,
M9185)
W
R
B
3480
Ohms
665
Ohms
536
Ohms
USE 1/2 WATT, 1% RESISTORS OF
SPECIFIED OHM RATINGS (INCLUDED
IN 4074EJM RESISTOR KIT). FOR
MOD IV MOTORS, THE Q7230 MODULE
CAN REPLACE THE RESISTORS.
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
M11806
RELATIVE HUMIDITY (%)