Compressor Crankcase Heater; Dirty Filter Switch - Bard W48A2PQ Installation And Service Instructions Manual

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COMPRESSOR CRANKCASE HEATER

Units are equipped with crankcase heaters that are
rated for the connnected voltage and operate during
compressor off cycle.

DIRTY FILTER SWITCH

Located inside the blower compartment, this switch
measures air pressure differential across the filter (see
Figure 2.19 on page 54). Manual reset only. Default
setting: 0.8"static, 50% blocked filter (approximately).
Temperature (F) vs. Resistance (R) of Temperature Sensor
F R F
196871 13.0 56985
190099 14.0 55284
183585 15.0 53640
177318 16.0 52051
171289 17.0 50514
165487 18.0 49028
159904 19.0 47590
154529 20.0 46200
149355 21.0 44855
144374 22.0 43554
139576 23.0 42295
134956 24.0 41077
130506 25.0 39898
126219 26.0 38757
122089 27.0 37652
118108 28.0 36583
114272 29.0 35548
110575 30.0 34545
107010 31.0 33574
103574 32.0 32634
100260 33.0 31723
97064 34.0 30840
93981 35.0 29986
91008 36.0 29157
88139 37.0 28355
0.0 85371 38.0 27577
1.0 82699 39.0 26823
2.0 80121 40.0 26092
3.0 77632 41.0 25383
4.0 75230 42.0 24696
5.0 72910 43.0 24030
6.0 70670 44.0 23384
7.0 68507 45.0 22758
8.0 66418 46.0 22150
9.0 64399 47.0 21561
62449 48.0 20989
60565 49.0 20435
58745 50.0 19896
TABLE 2.4
R F R
53.0 19374 89.0
52.0 18867 90.0
53.0 18375 91.0
54.0 17989 92.0
55.0 17434 93.0
56.0 16984 94.0
57.0 16547 95.0
58.0 16122 96.0
59.0 15710 97.0
60.0 15310 98.0
61.0 14921 99.0
62.0 14544 100.0
63.0 14177 101.0
64.0 13820 102.0
65.0 13474 103.0
66.0 13137 104.0
67.0 12810 105.0
68.0 12492 106.0
69.0 12183 107.0
70.0 11883 108.0
71.0 11591 109.0
72.0 11307 110.0
73.0 11031 111.0
74.0 10762 112.0
75.0 10501 113.0
76.0 10247 114.0
77.0 10000 115.0
78.0 9760 116.0
79.0 9526 117.0
80.0 9299 118.0
81.0 9077 119.0
82.0 8862 120.0
83.0 8653 121.0
84.0 8449 122.0
85.0 8250 123.0
86.0 8057 124.0
87.0 7869
88.0 7686
ZETTLER ISOLATION RELAYS:
WALL-MOUNT UNIT
Black Zettler surface mount relays used in the wall-
mount unit to isolate the start signal from the high
pressure relay circuit (see Figure 2.20 on page 54).
FUSES
5x20mm time delay, glass tube fuse: 250VAC rated
voltage, 35 rated amp interruption at rated voltage.
BATTERIES
Used in wall-mount unit and controller boards, flat-disk
style BR2330 3V battery. Used only for time/date during
complete power loss. Estimated lifespan 7-8 years.
F R
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
Manual
Page
2100-642
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