Tightening Torques; Connection Of Controller; Internal Electric Heaters - Grant Aerona 290 Installation & Operating Instructions Manual

6.2

TIGHTENING TORQUES

When tightening fixings:
• Use the correct screwdriver. Small screwdrivers can damage
the screw head and prevent appropriate tightening.
• Over-tightening the terminal screws can cause damage.
! WARNING !
When using crimp type terminals, ensure the terminal
screws are sufficiently tightened, otherwise overheating
may occur and possibly cause extensive damage inside the
heat pump. Do not over tighten.
6.3

CONNECTION OF CONTROLLER

For information relating to the connection of the Grant Aerona
Smart Controller, Refer to Section 7.
6.4

INTERNAL ELECTRIC HEATERS

The Grant Aerona 290 comes factory fitted with a number of electric heaters that aid various internal functions within the heat pump.
Refer to table 6-4 for heaters and related electrical specifications.
• The base tray heater melts any frozen condensate collected in the base of the heat pump. Refer to Section 1.2.
•
The compressor crankcase heater is used to prevent refrigerant from mixing with compressor oil when the compressors are
stopped. Refer to Section 8.2.2 for more information.
• The plate heat exchanger heater is activated in frost protection cycles to stop ice from forming inside the plate heat exchanger.
Refer to Section 8.5.8 for more information.
Table 6-4: Base tray, Compressor crankcase and Plate Heat Exchanger heater specifications
Base tray heater specification
Specification
Voltage
Power
Maximum temperature
Current
Resistive load
Resistance at 20 °C
Section 6: Electrical
Unit Base Tray
V 230
W 43.70
°C 180
A 0.19
Ω 1210 ± 7%
Compressor Crankcase Plate Heat Exchanger
230
27.30
180
0.12
1936 ± 7%
230
21.90
180
0.10
2420 ± 7%
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