Checking The Outdoor Unit Electrical Connections For Firm Seating; Resetting The High Limit Safety Cut-Out; Closing The Heat Pump - Viessmann VITOCAL 150-A Installation And Service Instructions Manual

Checking the outdoor unit electrical connections for firm seating

Danger
Contact with live components can lead to seri-
ous injury from electric current. Some compo-
nents on PCBs remain live even after the power
supply has been switched off.
When working on the outdoor unit, isolate the
■
system from the power supply, e.g. at a sepa-
rate MCB/fuse or a mains isolator. Check the
system is no longer live and safeguard against
reconnection.
■ Prior to working on the appliance, wait at least
4 min until the voltage on the charged capaci-
tors has completely dropped out.

Resetting the high limit safety cut-out

A
Fig. 65
High limit safety cut-out reset button
A

Closing the heat pump

Danger
The absence of system component earthing can
lead to serious injury from electrical current and
component damage in the event of an electrical
fault.
■ Before closing the indoor unit, restore all pro-
tective conductor connections.
■ Check whether equipment and pipe connec-
tions are connected to the equipotential bond-
ing of the building. Restore the connections if
required.
!
Please note
If a casing door is not securely closed this can
lead to damage from condensation, vibrations
and excessive noise.
Check all-round seal of front panel for dam-
■
age.
■ Close appliance correctly.
■ On pipe and hose outlets, ensure the thermal
insulation is seated correctly.
Commissioning, inspection, maintenance
!
Please note
If the heat pump is exposed to temperatures
below 10 °C, e.g. during storage or transport,
–
the high limit safety cut-out of the instantaneous
heating water heater may respond. In this case,
the instantaneous heating water heater will not
heat up.
Heat up the high limit safety cut-out to above
20 °C. Press the reset button of the high limit
safety cut-out.
Note
The high limit safety cut-out can only be reset if the
temperature at the sensor is below 82 °C.
!
Please note
Leaking hydraulic connections lead to appliance
damage.
Check the internal and on-site hydraulic con-
■
nections for leaks.
■ In the event of leaks, switch off the appliance
immediately. Drain the heating water. Check
the seating of seal rings. Replace any seal
rings that may have become dislodged.
Close the heat pump after completing all work.
For commissioning this appliance, see also the
operating instructions.
93