Bosch ZBR28-3A Installation And Service Instructions

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6 720 643 068 (2011/06)Copyright (optional information)
16.4 Check sensor values
16.4.1 Outdoor temperature sensor
16.4.2 Additional supply temperature limiter
16.4.3 Supply temperature sensor, External supply
temperature sensor, DHW tank temperature
sensor, DHW temperature sensor
Temperature °F ( °C)
Testing tolerance ± 10%
Resistance [ Ω]
– 4 ( – 20) 2,392
3 ( – 16) 2,088
10 ( – 12) 1,811
17 ( – 8) 1,562
24 ( – 4) 1,342
32 (0) 1,149
39 (4) 984
46 (8) 842
50 (10) 781
59 (15) 642
68 (20) 528
77 (25) 436
Tab. 39 Resistance table outdoor temperature sensor
Temperature °F ( °C)
Testing tolerance ± 10%
Resistance [ Ω]
32 (0) 33,555
50 (10) 21,232
68 (20) 13,779
86 (30) 9,128
104 (40) 6,205
122 (50) 4,298
140 (60) 3,025
158 (70) 2,176
176 (80) 1,589
194 (90) 1,177
212 (100) 886
Tab. 40 Resistance table supply temperature limiter
Temperature °F ( °C)
Testing tolerance ± 10%
Resistance [ Ω]
68 (20) 14,772
77 (25) 11,981
86 (30) 9,786
95 (35) 8,047
104 (40) 6,653
113 (45) 5,523
122 (50) 4,608
131 (55) 3,856
140 (60) 3,243
149 (65) 2,744
158 (70) 2,332
167 (75) 1,990
176 (80) 1,704
185 (85) 1,464
194 (90) 1,262
203 (95) 1,093
212 (100) 950
Tab. 41 Resistance table NTCs

Bosch ZBR28-3A Specifications

General

DHW Output	28 kW
Efficiency	98%
NOx class	5
ErP heating efficiency class	A
ErP DHW efficiency class	A
Protection class	IPX4D
Max Operating Pressure	3 bar
Type	Condensing
Gas type	Natural gas / LPG
Fuel Type	Gas