E(D/B)(H/L)Q011~016BB
Unit for air to water heat pump system
4PW67904-1 – 01.2011
Installation manual
50
12. M
AINTENANCE
AND
SERVICE
In order to ensure optimal availability of the unit, a number of checks
and inspections on the unit and the field wiring have to be carried out
at regular intervals.
This maintenance shall be carried out by the installer or service
agent.
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.
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
(1)
.
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
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, K3M, K5M
(applications with domestic hot water tank only) and K4M by
use of an ohm meter. All contacts of these contactors must
be in open position.
INFORMATION
■
When the program is stopped by an error, by an
operation switch off or by a power failure, then the
U3
error will be displayed.
To resolve the error codes, see
"13.3. Error codes" on
page 53
.
In this case [F-09] (Latest action number executed)
will contain the latest action executed.
■
[F-08] The "Underfloor heating screed dry-out
program enabled (1)/disabled (0)" is always set to 0
(disable) when a program has been started once. This
means that in case a second time an underfloor
heating screed dry-out program must be started then
[F-08] needs to be set again.
DANGER: ELECTRIC SHOCK
■
Before carrying out any maintenance or repair activity,
always switch off the circuit breaker on the supply
panel, remove the fuses (or switch off the circuit
breakers) or open protection devices of the unit.
■
Make sure that before starting any maintenance or
repair activity, also the power supply to the unit is
switched off.
■
Do not touch live parts for 10 minutes after the power
supply is turned off because of high voltage risk.
■
The heater of the compressor may operate even in
stop mode.
■
Please note that some sections of the electric
component box are hot.
■
After measuring the residual voltage, pull out the fan
connector.
■
Make sure you do not touch a conductive section.
■
The fan may rotate due to strong backblow wind,
causing the capacitor to charge. This may result in an
electric shock.
■
Do not rinse the unit. This may cause electric shocks
or fire.
■
When service panels are removed, live parts can be
easily touched by accident.
Never leave the unit unattended during installation or
servicing when service panel is removed.
After maintenance, make sure the fan connector is
connected again. Otherwise, the unit may break down.
See
"2. General safety precautions" on page 2
.
NOTICE
Touch a metal part by hand (such as the stop valve) in
order to eliminate static electricity and to protect the PCB
before performing service.
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.
DANGER
■
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.
See
"2. General safety precautions" on page 2
.
(1) Only applicable for tank with built-in electrical booster heater (EKHW*).
