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Premier Heat Pumps – Water Heater and Chiller Manual
Page 16
5 - Instructions for the Installer
The installer must read the following and provide instructions to the purchaser.
5-1 Unit controller and parameters
The Heat Pump is Equipped with 2 Control Devices:
• A defrost temperature probe, located on the evaporator, starts the defrost
sequence.
• A thermal probe located on the exchanger ensures the cut of the heat
pump when the temperature of the water reaches the temperature
required.
• The meaning of the code name
T1: water temperature
T2: ambient temperature
T3: exhaust temperature from compressor
T4: coil temperature in outdoor heat exchanger
TC: water temperature setting
Control Function:
1) TC can be set between 10C-35°C in cooling mode. Original TC is 18°C.
When T1≤T°C -1°C, Compressor and fan motor stop; When T1≥T°C
+1°C, Compressor and fan motor start.
2) TC can be set between 45°C -60°C in heating mode. Original TC is
50°C. When T1≤TC-1C, Compressor and fan motor start; When
T1≥TC+1C, Compressor and fan motor stop. When compressor is
running, if T2≤12°C, the four way valve2 on; if T2≥12°C, the four way
valve2 off.
5-2 Defrost operation:
1) Defrost:
The system begins to defrost if the following three terms are met in the
same time:
a) T4≤-5°C lasts for a while;
b) compressor runs continuously for more than 5 minutes
c) Compressor runs accumulative total for 45 minutes
While the system begins to defrost, compressor and fan motor stop first and
four way valve1 is on after 1 minute and begins to work. The compressor
restarts after it has stopped for 3 minutes. If the sensor for T4 is damaged, the
system begins to defrost, after the compressor has run continuously for 45