CLIVET WSAN-YMi 21, Manual For Installation, Use And Maintenance, Page: 103 / 156

103
Volume of tank is too small and
the location of water
temperature probe not high
enough
•
Set dT1s5 to 20, and set t_DHWHP_RESTRICT to minimum value.
•
Set dT1SH to 2.
• Enable TBH, and TBH should be controled by the outdoor unit.
•
If AHS(boiler) is available, turn boiler on first, if requirement for turn heat pump on is fullfilled, the
heat pump will turn on.
•
If both TBH and AHS are not available, try to change the postion of T5 probe
Heat mode can’t change to DHW mode immediately
Backup heater operation is not
activated.
Check that the "OTHER HEATING SOURCE/ BACKUP HEATER"is enabled, see chapter 9 Start-up
and configuration - OTHER HEATING SOURCE.
Check whether or not the thermal protector of the backup heater has been activated (see chapter to
Electronic board layout - main control board to thermal protector of the backup heater for location of
the reset button).
Check if booster heater is running, the backup heater and booster heater can’t operate
simultaneously.
Too much heat pump capacity
is used for heating domestic hot
water (applies only to
installations with a domestic hot
water tank).
Check that the 't_DHWHP_MAX' and “t_DHWHP_RESTRICT” are configured appropriately:
• Make sure that the 'DHW PRIORITY' in the user interface is disabled.
•
Enable the”T4_TBH_ON “in the user interface/FOR SERVICEMAN to activate the booster
heater for domestic water heating.
Space heating capacity shortage at low outdoor temperatures
Heat exchanger for space
heating not big enough
•
Set t_DHWHP_MAX to minimum value, the suggested value is 60min.
• If circulating pump out of unit is not controlled by unit, try to connect it to the unit.
•
Add 3-way valve at the inlet of fan coil to ensure enough water flow.
Space heating load is small Normal , no need for heating
Disinfect function is enabled but
without TBH
• Disable disinfect function
•
add TBH or AHS for DHW mode
DHW mode can’t change to Heat mode immediately
Surface of coil in the tank not
large enough
The same solution for Symptom 7
TBH or AHS not available
Heat pump will stay in DHW mode untill t_DHWHP_MAX reached or setpoint is reached. Add TBH
or AHS for DHW mode,TBH and AHS should be controlled by the unit.
DHW mode heat pump stop work but setpoint not reached, space heating require heat but unit stay in DHW mode