10 Troubleshooting
Installer reference guide
19
07C2V3
ROTEX HPSU monobloc compact outdoor unit
4P501827-1 – 2017.08
To make sure this water originates from the tank, check after a tank
heat up cycle.
It is recommended to do this maintenance more frequently.
Switch box
Carry out a thorough visual inspection of the switch box and look for
obvious defects such as loose connections or defective wiring.
WARNING
If the internal wiring is damaged, it has to be replaced by
the manufacturer, its service agent or similarly qualified
persons.
Booster heater of the domestic hot water tank
See the installation manual of the HPSU monobloc tank.
10
Troubleshooting
10.1
Overview: Troubleshooting
For instructions on how to troubleshoot the system, see the
installation manual of the HPSU monobloc tank.
Before troubleshooting
Carry out a thorough visual inspection of the unit and look for
obvious defects such as loose connections or defective wiring.
11
Disposal
NOTICE
Do not try to dismantle the system yourself: the dismantling
of the system, treatment of the refrigerant, oil and other
parts must comply with applicable legislation. Units must
be treated at a specialised treatment facility for reuse,
recycling and recovery.
11.1
Overview: Disposal
Typical workflow
Disposing of the system typically consists of the following stages:
1
Pumping down the system.
2
Bringing the system to a specialized treatment facility.
INFORMATION
For more details, see the service manual.
11.2
To pump down
Example:
To protect the environment, pump down when disposing
of the unit.
It is NOT required to pump down when relocating the unit.
DANGER: RISK OF EXPLOSION
Pump down – Refrigerant leakage.
If you want to pump
down the system, and there is a leakage in the refrigerant
circuit:
▪ Do NOT use the unit's automatic pump down function,
with which you can collect all refrigerant from the
system into the outdoor unit.
Possible consequence:
Self-combustion and explosion of the compressor
because of air going into the operating compressor.
▪ Use a separate recovery system so that the unit's
compressor does NOT have to operate.
NOTICE
During pump down operation, stop the compressor before
removing the refrigerant piping. If the compressor is still
running and the stop valve is open during pump down, air
will be sucked into the system. Compressor breakdown or
damage to the system can result due to abnormal pressure
in the refrigerant cycle.
Pump down operation will extract all refrigerant from the system into
the outdoor unit.
1
Remove the valve lid from the liquid stop valve and the gas stop
valve.
2
Carry out the forced cooling operation.
3
After 5 to 10 minutes (after only 1 or 2 minutes in case of very
low ambient temperatures (<−10°C)), close the liquid stop valve
with a hexagonal wrench.
4
Check with the manifold if the vacuum is reached.
5
After 2-3 minutes, close the gas stop valve and stop forced
cooling operation.
a
c
b
d
d
e
a
Gas stop valve
b
Closing direction
c
Hexagonal wrench
d
Valve lid
e
Liquid stop valve
11.3
To start and stop forced cooling
Confirm that DIP switch SW2 is in COOL mode.
1
Press the forced cooling operation switch SW1 to begin forced
cooling.
2
Press the forced cooling operation switch SW1 to stop forced
cooling.
NOTICE
Take care that while running forced cooling operation, the
water temperature remains higher than 5°C (see
temperature read out of the indoor unit). You can achieve
this, for example, by activating all fans of the fan coil units.
