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Daikin RHSXB04P30D — устранение неисправностей и обслуживание тепловых насосов [41/68]

8 Faults and malfunctions

Installation and maintenance instructions

ROTEX HPSU compact Ultra RHSX(B)-D

Heat pump (indoor unit) with integrated heat accumulator

008.1444444_01 – 11/2018 – EN

Malfunction Possible cause Possible solution

Heating does not warm

up enough

Water flow too low.

▪ Check that all stop valves of the water circuit are fully open.

▪ Check that the water filter is dirty.

▪ Check if the expansion tank is defective.

▪ Completely vent the heating system and the internal circula-

tion pump.

▪ On the controller ("Information" menu), check that sufficient

water pressure (>0.5bar) is available; if necessary, top up

heating water.

▪ Check that the resistance in the water circuit is not too high

for the pump (see Chap. 10).

Target value range is too low. In [→Main menu →Configuration →Heating]:

▪ Increase the [Heat-Slope ] parameter.

▪ Increase the [HZU max. temperature ] parameter.

▪ Increase the [Max. feed temperature] parameter.

Weather-compensated inflow temperature control

active.

▪ Check the [Heating operation limit] parameter, [Heat-Slope] in

[→Main menu →Configuration →Heating].

Optional backup heater (BUxx) or alternative heater

booster not cut in.

▪ Check mains supply of the backup heater (BUxx).

▪ Thermal contactor (STB) on the backup heater (BUxx) has

triggered. Unlock.

▪ Check the [Config. of external heat source] and [Ext. power

level 1] and [Ext. power level 2] parameters [→Main menu

→Settings →Ext. source].

Water volume in heating system too low

▪ Check the admission pressure in the expansion tank and wa-

ter pressure; if necessary, top up the heating water and adjust

the admission pressure (seeChap. 7.2.2).

Domestic hot water preparation is taking too much of

the output of the heat pump.

▪ Check the settings of the [Config. of external heat source]

parameter [→Main menu →Settings →Ext. source].

▪ Check the settings of the [Ext. hot water power] parameter

[→Main menu →Settings →Ext. source].

Hot water does not

warm up

Domestic hot water preparation shut off (e.g. switch-

ing time program is in the economy phase, paramet-

ers for domestic hot water preparation incorrectly

set).

▪ Check the operating mode setting.

▪ Check the request parameters.

Storage tank charging temperature too low.

▪ Increase the target hot water temperature.

Draw-off rate too high.

▪ Reduce the draw-off rate, limit throughput.

Output of heat pump too low.

▪ Check the switching times for room heating and domestic hot

water preparation for overlaps.

Water volume in heating system too low.