Enthalpy Set Point Chart - York Predator BP078 Installation Manual

is proportionately modulated from the 2 to 10 Vdc signal, with
2 Vdc corresponding to full closed and 10 Vdc corresponding
to full open. When there is no call for free cooling, the damper
position is limited by the IAQ Max damper position setting.
When the signal exceeds it's set point (Demand Control Ven-
tilation Set Point) setting and there is a call for free cooling,
the actuator modulates from the minimum position to the full
open position based on the highest call from either the mixed
air sensor input or the AQ voltage input.
FIGURE 20 - ENTHALPY SET POINT CHART
FIGURE 21: HONEYWELL ECONOMIZER CONTROL W7212
24
CONTROL POINT
CONTROL
0 0
APPROX. F ( C)
CURVE
AT 50% RH
A
73 (23)
B
70 (21)
C 67 (19)
D 63 (17)
60
(16)
55
(13)
B
50
(10)
C
45
(7)
D
40
(4)
35
(2)
40 45
35 50 55
(2) (10) (13)
(4) (7)
APPROXIMATE DRY BULB TEMPERATURE -
Exhaust Air
Adjustment
Screw
N
N1
Exhaust Air LED
Damper Min.
Position
P1
P
Screw
Indoor Air Quality
T1
T
Max. Adjustment
Screw
Indoor Air Quality
LED
AQ1 AQ
Indoor Air Quality
Min. Adjustment
SO+ SO
Screw
Free Cooling LED
SR
SR+
B
A
Economizer Enthalpy
Set Point Adjustment
Screw
• Optional CO Space Sensor Kit Part # 2AQ04700324
2
• Optional CO Sensor Kit Part # 2AQ04700424
2
Replace the top rear access panel on the unit.
85 90 95 100 105
(29) (32) (35) (38) (41)
80
(27)
75
(24)
70
(21)
65
(18)
A
A
B
C
D
65 95
60 70 75 80 85 90 100
(16) (21) (24) (27) (29) (32) (38)
(18) (35)
0 0
F ( C)
EXH
TR TR1
Set
24
Vac Vac
EXH
HOT COM
Min
Pos
+
IAQ
1
Max
IAQ
IAQ
Min
3
Free
Cool
EF
C
D
127421-YIM-C-0606
110
(43)
105 110
(41) (43)
24
2
5
4
EF1
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