Troubleshooting; General Guidelines - Rotex RKHBH008BA Installation Manual

The described checks must be executed at least once a year.
1 Water pressure
Check if the water pressure is above 1 bar. If necessary add
water.
2 Water filter
Clean the water filter.
3 Water pressure relief valve
Check for correct operation of the pressure relief valve by
turning the red knob on the valve counter-clockwise:
■ If you do not hear a clacking sound, contact your local dealer.
■ In case the water keeps running out of the unit, close both
the water inlet and outlet shut-off valves first and then contact
your local dealer.
4 Pressure relief valve hose
Check that the pressure relief valve hose is positioned
appropriately to drain the water.
If the (optional) drain pan kit is installed, make sure that the
pressure relief valve hose end is positioned in the drain pan.
5 Backup heater vessel insulation cover
Check that the backup heater insulation cover is fastened tightly
around the backup heater vessel.
6 Domestic hot water tank pressure relief valve (field supply)
Applies only to installations with a domestic hot water tank.
Check for correct operation of the pressure relief valve on the
domestic hot water tank.
7 Domestic hot water tank booster heater
Applies only to installations with a domestic hot water tank.
It is advisable to remove lime buildup on the booster heater to
extend its life span, especially in regions with hard water. To do
so, drain the domestic hot water tank, remove the booster heater
from the domestic hot water tank and immerse in a bucket (or
similar) with lime-removing product for 24 hours.
8 Indoor unit switch box
■ Carry out a thorough visual inspection of the switch box and
look for obvious defects such as loose connections or
defective wiring.
■ Check for correct operation of contactors K1M, K2M, K3M,
K5M (applications with domestic hot water tank only) and
K4M by use of an ohmmeter. All contacts of these contactors
must be in open position.
Installation manual
35
T
ROUBLESHOOTING
This section provides useful information for diagnosing and
correcting certain troubles which may occur in the unit.
This troubleshooting and related corrective actions may only be
carried out by your local technician.

General guidelines

Before starting the troubleshooting procedure, carry out a thorough
visual inspection of the unit and look for obvious defects such as
loose connections or defective wiring.
DANGER
When carrying out an inspection on the switch box of the
unit, always make sure that the main switch of the unit is
switched off.
When a safety device was activated, stop the unit and find out why
the safety device was activated before resetting it. Under no
circumstances safety devices may be bridged or changed to a value
other than the factory setting. If the cause of the problem cannot be
found, call your local dealer
.
If the pressure relief valve is not working correctly and is to be
replaced, always reconnect the flexible hose attached to the pressure
relief valve, to avoid water dripping out of the unit!
DANGER
Do not touch water pipes during and immediately after
operation as the pipes may be hot. Your hand may suffer
burns. To avoid injury, give the piping time to return to
normal temperature or be sure to wear proper gloves.
WARNING
■
Do not touch the refrigerant pipes during and
immediately after operation as the refrigerant pipes
may be hot or cold, depending on the condition of the
refrigerant flowing through the refrigerant piping,
compressor, and other refrigerant cycle parts. Your
hands may suffer burns or frostbite if you touch the
refrigerant pipes. To avoid injury, give the pipes time to
return to normal temperature or, if you must touch
them, be sure to wear proper gloves.
■
Do not touch the internal parts (pump, backup heater,
etc.) during and immediately after operation.
Your hands may suffer burns if you touch the internal
parts. To avoid injury, give the internal parts time to
return to normal temperature or, if you must touch
them, be sure to wear proper gloves.
Indoor unit for air to water heat pump system
RKHBH/X008BA
4PW54224-1A