Descaling; Draining; Troubleshooting; General Guidelines - Rotex RKHTS200AB Manuel D'installation

Descaling

Depending on the water quality and set temperature, scale can
deposit on the heat exchanger inside the domestic hot water tank
and can restrict heat transfer. For this reason, descaling of the heat
exchanger may be required at certain intervals.
When using means for descaling, it must be ensured that
the water quality remains compliant with the requirements
of EU directive 98/83/EC.

Draining

Follow the next steps to drain the domestic hot water tank:
1 Switch off the power supply.
2 Turn off the cold water supply valve.
3 Open the hot water taps.
4 Open the drain valve.
T
ROUBLESHOOTING
This section provides useful information for diagnosing and
correcting certain troubles which may occur in the unit.

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.
When carrying out an inspection on the supply panel or on
the switch box of the unit, always make sure that the circuit
breaker 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.

General symptoms

Symptom 1: No water flow from hot taps
P
OSSIBLE CAUSES
The main water supply is off.
Symptom 2: Water from hot taps is cold
P
OSSIBLE CAUSES
The thermal cut-out located in the
indoor unit has operated
The indoor unit (RKHBRD) is not
operating.
RKHTS200+260AB
Domestic hot water tank for air to water heat pump system
4PW61220-1
C
ORRECTIVE ACTION
Check that all shut off valves of the
water circuit are completely open.
C
ORRECTIVE ACTION
• Check and find the cause of tripping
and then reset button.
• Check if thermistor is correctly
installed in thermistor socket.
Procedure: remove front panel and
insulation, replace or fix the sensor.
Check the indoor unit operation.
Refer to the manual delivered with
the indoor unit.
If any faults are suspected, contact
your local dealer.
Symptom 3: Intermittent water discharge
P
OSSIBLE CAUSES
Thermal control failure (water will be
hot).
The expansion vessel is broken.
Symptom 4: Dirty water and water that gives off odours
P
OSSIBLE CAUSES
Dirty water
D
ISPOSAL REQUIREMENTS
Dismantling of the unit and treatment of parts must be done in
accordance with relevant local and national legislation.
T
ECHNICAL SPECIFICATIONS
Domestic hot water tank specifications
RKHTS200AB
Storage capacity
(l)
Internal heat
(l)
exchanger volume
Material Stainless steel
Overall
dimensions 1335 x 600 x 695
(mm)
(h x l x w)
Connections Quick coupling/G 3/4" F Quick coupling/G 3/4" F
Weight (empty)
Mounting On top of RKHBRD
or floor mounted
Maximum pressure
domestic hot water
(bar)
tank
Maximum primary
working pressure
(bar)
(heating side)
Maximum
temperature
(°C)
domestic hot water
Maximum
temperature heat
(°C)
exchanger
C
ORRECTIVE ACTION
Contact your local dealer.
Replace the expansion vessel.
C
ORRECTIVE ACTION
Flush or clean the domestic hot
water tank after periods of standstill.
It could occur that particles in the
water deposit on the bottom of the
tank. If this deposit layer becomes
thick enough it could enter the hot
water outlet and contaminate the hot
water.
RKHTS260AB
200 260
7.5 7.5
Stainless steel
1610 x 600 x 695
70 78
On top of RKHBRD
or floor mounted
10 10
3 3
75 75
85 85
Installation manual
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