Optional Equipment; Chart 1 -1K Ω Outdoor Air Sensor Data; Chart 2 -10K Ω Indirect Tank Sensor Data - ECR International UTICA BOILERS MAHF-75 Installation, Operation And Maintenance Manual

Optional Equipment

IMPORTANT: Sensors supplied with this boiler are proprietary to the manufacturer. Use of alternate market sensors
WILL diminish boiler performanc
1. Outdoor Air Sensor, if used.
1k Ω
A. Boiler automatically recognizes sensor when used.
B. See Chart 1 for sensor data. Sensor part number BD710487302V
C. Locate outdoor sensor to protect against wind and direct sunlight. Mounting instructions provided with sensor.
D. Maximum wire length is 100 ft (30m) for 22 ga. wire, or 150 ft (45m) for 18 ga. wire.
E. Connect wires to M2 OUTDOOR SENSOR terminals 4 & 5. Wires are interchangeable. See Accessories.
2.
Sensor for Indirect DHW Tank (Heating Only Boiler, Exception: not applicable to the 165 model, use aquastat
10k Ω
for indirect tank control.).
A. See Chart 2 for sensor data.
B. Connect wires to M2 terminals 3 & 4.
CHART 1 -1K Ω OUTDOOR AIR SENSOR DATA
T R
[°F] [Ohm]
-4.0 7,578
-2.2 7,193
-0.4 6,831
1.4 6,489
3.2 6,166
5.0 5,861
6.8 5,574
8.6 5,303
10.4 5,046
12.2 4,804
14.0 4,574
15.8 4,358
17.6 4,152
19.4 3,958
21.2 3,774
23.0 3,600
24.8 3,435
26.6 3,279
28.4 3,131
30.2 2,990
32.0 2,857
33.8 2,730
35.6 2,610
37.4 2,496
39.2 2,387
41.0 2,284
42.8 2,186
44.6 2,093
46.4 2,004
48.2 1,920
50.0 1,840
51.8 1,763
OPTIONAL EQUIPMENT
e.
T R
[°F] [Ohm]
53.6 1,690
55.4 1,621
57.2 1,555
59.0 1,492
60.8 1,433
62.6 1,375
64.4 1,321
66.2 1,268
68.0 1,218
69.8 1,170
71.6 1,125
73.4 1,081
75.2 1,040
77.0 1,000
78.8 962
80.6 926
82.4 892
84.2 858
86.0 827
87.8 796
89.6 767
91.4 740
93.2 713
95.0 687
96.8 663
98.6 640
100.4 617
102.2 595
100.4 617
102.2 595
104.0 575
106.0 556
CHART 2 -10K Ω INDIRECT TANK SENSOR DATA
T
[°F] [Ohm]
32.0
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
29
R T
[°F]
32,505 86.0
30,898 87.8
29,381 89.6
27,946 91.4
26,590 93.2
25,308 95.0
24,094 96.8
22,946 98.6
21,859 100.4
20,829 102.2
19,854 104.0
18,930 105.8
18,054 107.6
17,223 109.4
16,436 111.2
15,689 113.0
14,980 114.8
14,306 116.6
13,667 118.4
13,060 120.2
12,483 122.0
11,935 123.8
11,414 125.6
10,919 127.4
10,447 129.2
9,999 131.0
9,572 132.8
9,166 134.6
8,779 136.4
8,411 138.2
PN 240012875 REV. D [03/15/2022]
R
[Ohm]
8,060
7,726
7,407
7,103
6,813
6,537
6,273
6,021
5,781
5,551
5,332
5,123
4,923
4,732
4,549
4,374
4,207
4,047
3,894
3,748
3,608
3,473
3,345
3,222
3,104
2,991
2,882
2,778
2,679
2,583