Manual 2100-537
I
Page 37 of 54
F R F R
53.0
52.0
53.0
54.0
55.0
56.0
57.0
58.0
59.0
60.0
61.0
62.0
63.0
64.0
65.0
66.0
67.0
68.0
69.0
70.0
71.0
72.0
73.0
74.0
75.0
76.0
77.0
78.0
79.0
80.0
81.0
82.0
83.0
84.0
85.0
86.0
87.0
88.0
19374
18867
18375
17989
17434
16984
16547
16122
15710
15310
14921
14544
14177
13820
13474
13137
12810
12492
12183
11883
11591
11307
11031
10762
10501
10247
10000
9760
9526
9299
9077
8862
8653
8449
8250
8057
7869
7686
89.0
90.0
91.0
92.0
93.0
94.0
95.0
96.0
97.0
98.0
99.0
100.0
101.0
102.0
103.0
104.0
105.0
106.0
107.0
108.0
109.0
110.0
111.0
112.0
113.0
114.0
115.0
116.0
117.0
118.0
119.0
120.0
121.0
122.0
123.0
124.0
7507
7334
7165
7000
6840
6683
6531
6383
6239
6098
5961
5827
5697
5570
5446
5326
5208
5094
4982
4873
4767
4663
4562
4464
4367
4274
4182
4093
4006
3921
3838
3757
3678
3601
3526
3452
DESUPERHEATER CONTROL BOARD
SEQUENCE OF OPERATION
The desuperheating control board will make a
determination whether or not to energize the pump
relay inclusive on the control board.
A. It will constantly monitor inputs from two
temperature sensors, Inlet & Outlet water sensors.
B. It will constantly monitor the Y signal.
C. Upon acknowledgment of Y signal, and following
two minutes, the control board will energize the
pump relay.
D. After 1½ minutes, based on temperature difference
between Outlet & Inlet sensors, and the presence of
Y signal, the following will take place:
TEMPERATURE F VS RESISTANCE R OF TEMPERATURE SENSOR
1.) If temperature difference is greater than 3°F,
then the control will continue to energize pump
relay.
2.) If temperature difference is less than 3°F, then
the control will de-energize the pump relay.
3.) The control will next wait for 10 minutes
before repeating Step #1 (above).
E. The Over Temperature Limit Switch is placed in
series with the line voltage. Therefore, continuity
between L of line voltage and L of pump output is
forced broken when the Over Temperature Limit
Switch opens (see Wiring Diagram).
F. The 3-amp fuse is put in series with the R
connection to the board. Whenever the fuse
is blown, the control will lose power and
consequently, the relay will disengage.
Figure 16 — THERMISTOR
