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INSTALLER'S GUIDE
Location of Enthalpy Set Point,
Minimum Position and LED
1
MINIMUM DAMPER POSITION ADJUSTMENT
IS PRESENT ONLY ON W7459A,D MODELS.
Table 3. Temp vs. OHM Values for MAS (Mixed Air Sensor)
Temp F
33.8
35.6
37.4
39.2
41.0
42.8
44.6
46.4
48.2
50.0
51.8
53.6
55.4
57.2
59.0
60.8
62.6
64.4
66.2
68.0
69.8
71.6
73.4
75.2
77.0
78.8
80.6
82.4
84.2
86.0
87.8
89.6
91.4
93.2
95.0
96.8
98.6
100.4
14
ENTHALPY
CHANGEOVER
SETPOINT
MINIMUM
DAMPER
POSITION
1
SETTING
LED LIGHTS
WHEN OUTDOOR
AIR IS SUITABLE
FOR FREE COOLING
M9098B
Figure 17. Enthalpy LEDs and Checkout
Temp vs. OHM for MAS (Mixed Air Sensor)
Temp C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
Meter Location for Checkout
and Troubleshooting
W7459
TR
B
C
S O
D
A
S R
INSERT DC MILLIAMMETER BETWEEN S O AND S FOR CHECKOUT
MULTIMETER
1
AND TROUBLESHOOTING.
2
JUMPER USED FOR SINGLE ENTHALPY CONTROL.
R(K OHMS)
DC Volts
9.576
9.092
8.636
8.204
7.796
7.412
7.048
6.705
6.380
6.073
5.782
5.507
5.247
5.000
4.767
4.545
4.335
4.136
3.948
3.769
3.599
3.437
3.284
3.138
3.000
2.869
2.744
2.625
2.512
2.404
2.301
2.204
2.111
2.023
1.938
1.858
1.781
1.708
ENTHALPY CHANGEOVER
SETPOINT
TR1
+
1
+
S
+
C7400
+
2
DC
620 OHM
MULTIMETER
MILLIMETER
JUMPER
LED LIGHTS WHEN
OUTDOOR AIR IS SUITABLE
FOR FREE COOLING
M9097
3.910
3.882
3.894
3.863
3.829
3.790
3.749
3.713
3.674
3.634
3.590
3.550
3.507
3.420
3.373
3.328
3.283
3.239
3.180
3.157
3.118
3.080
3.034
3.007
2.971
2.932
2.896
2.860
2.824
2.787
2.750
2.714
2.676
2.639
2.600
2.561
2.526
2.484
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