Temperature Sensors

Overview:

The temperature sensors used in this water heater are negative temperature co-efficient (NTC) thermisitors. With this type sensor, as temperature increases,

the resistance across the thermisitor decreases or as temperature decreases, resistance will increase. The control board monitors the resistance of each sensor and converts each to a corresponding temperature. There are five (5) such sensors installed on the heat pump water heater to monitor ambient, evaporator (coil), upper tank, lower tank and compressor discharge temperatures. Each is critical to the operation of the unit. If there is a connection issue with any sensor, there should be a connection fault displayed on the User Interface Module (UIM) Maintenance Display see “Accessing the Maintenance Display” (p.21).

The water heater can continue to heat water with a faulty temperature sensor, but operation will be affected as follows:

•The unit can function with a faulty lower tank temperature sensor. Upper tank temperature will be used in place of average tank temperature.

•A fault with the ambient, compressor discharge or coil (evaporator outlet) temperature sensor will cause a HEAT PUMP fault, locking out the heat pump. The unit will operate as if in ELECTRIC mode until the problem is resolved and the fault is cleared.

•An upper tank temperature sensor fault will lock out all water heating means, both heat pump and elements, until the problem is resolved and the fault is cleared.

NOTE: After the problem is resolved, a fault must be cleared by turning off power to the unit at the breaker or fuse panel for ten (10) seconds and then turning it back on.

Temperature Sensor Resistance

Measurement:

If a temperature sensor connect fault is indicated by the Maintenance Display or if a temperature sensor issue is suspected, use the following procedure to check the sensor(s):

1.Check the resistance of a suspect temperature sensor by disconnecting the appropriate connector from the control board and placing the meter leads on the corresponding connector pins (see Table 4). Note that there are contacts located on the side of each connector that should be used.

2.Note the ambient temperature.

3.Compare the resistance reading on the appropriate Resistance vs. Temperature graph for the sensor being checked. If the reading is within ±2% of the value obtained from the graph, the sensor is good. If the value is outside this tolerance, the sensor should be replaced.

A more thorough check of a sensor can be done by checking at high and low temperature extremes. Check at low temperature by placing the sensor in ice. The reading should be 32°F. High temperature can be checked also, but do not exceed 130°F for the ambient sensor. All other sensors can be checked up to the boiling point (212°F). Submerge only the end of the sensor in boiling water; do not submerge the wire.

TABLE 5

Sensor

Connector /

Chart

 

Pins

 

Ambient

CN212

Chart #1

 

Pins 1 to 2

 

Coil-

CN212

Chart #1

Evaporator

Pins 5 to 6

 

 

 

Tank-Upper

CN204

Chart #2

 

Pins 1 to 2

 

Tank-Lower

CN204

Chart #2

 

Pins 3 to 4

 

Discharge-

CN212

Chart #2

Compressor

Pins 3 to 4

 

 

 

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American Water Heater RESIDENTIAL HYBRID ELECTRIC HEAT PUMP WATER HEATER, HPE10280H045DV Temperature Sensors, Overview
Page 31 Page 33

RESIDENTIAL HYBRID ELECTRIC HEAT PUMP WATER HEATER, HPE10260H045DV, HPE10280H045DV specifications

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