Electronic Components - IBC HC 15-95 Installation And Operating Instructions Manual

Water temperature sensors
TEMPERATURE RESISTANCE
F / C Ω - ohm
5F / -15C 76,020
14F / -10C 58,880
23F / -5C 45,950
32F / 0C 36,130
41F / 5C 28,600
50F / 10C 22,800
59F / 15C 18,300
68F / 20C 14,770
Table 12: Temperature Sensor Resistance Values – 12KΩ sensors.
5-2
HC SERIES BOILERS HC 13-50, HC 15-95, HC 15-96, HC 20-125, HC 33-160
5.2

ELECTRONIC COMPONENTS

This section details the method for troubleshooting the non-standard electronic
components on the boiler including the electronic water pressure sensor – type
LWCO and the temperature sensors.
5.2.1 Temperature Sensors
The resistance of the temperature sensors varies inversely with temperature. To
test, measure the temperature of the sensed environment and compare with the
value derived from the measurement of the resistance (obtained by connecting a
good quality test meter capable of measuring up to 5,000 kΩ (5,000,000Ω) at the
controller end of the sensor lead).
To obtain a resistance reading, remove power to the boiler. For the supply water
and return water temperature sensors, remove the wire leads by disconnecting
their respective Molex connectors. Place multi-meter probes into sensor's male
Molex connector socket. Do not apply voltage to the sensor (damage may result).
12KΩ Temperature Sensors supplied with boiler. See Table 12 for resistance
values.
SENSOR TYPE
S1 NTC 12KΩ
S2 NTC 12KΩ
S3 NTC 12KΩ
S4 NTC 10KΩ
S5 NTC 12KΩ
NTC 12KΩ
Temperature and Pressure Sensors
TEMPERATURE RESISTANCE
F / C
77F / 25C
86F / 30C
95F / 35C
104F / 40C
113F / 45C
122F / 50C
131F / 55C
140F / 60C
PURPOSE
Supply Water Temperature
Return Water Temperature
Domestic Hot Water
Hot Water Tank
Outdoor Sensor
Flue Gas Temperature
Water Pressure
TEMPERATURE RESISTANCE
Ω - ohm F / C
12,000 149F / 65C
9,805 158F / 70C
8,055 167F / 75C
6,653 176F / 80C
5,522 185F / 85C
4,609 194F / 90C
3,863 203F / 95C
3,253 212F / 100C
INSTALLATION AND OPERATION INSTRUCTIONS
LOCATION
Upper Left of Heat
Exchanger
Lower Left of Heat
Exchanger
DHW Supply Pipe
External Water Heater
Outdoors (North side)
Bottom of Heat Exchanger
at Flue outlet
Heating Supply Pipe
Ω - ohm
2,752
2,337
1,994
1,707
1,467
1,266
1,096
952