Fujitsu WATERSTAGE 112 Maintenance Document page 94

Heat Pump, Split System, Single Service, 3 phase
Heater
Line no. Programming line
5060 El imm heater optg mode
5061 Electric immersion heater release
El imm heater optg mode
•
Substitution
The heater performs DHW charging as soon as the
heat pump is stopped or becomes inoperative, or if
the heat pump has finished charging without reaching
the setpoint.
The DHW tank heater switch-on point is calculated so
as to optimise the changeover level.
If the DHW temperature falls below the current
setpoint (1610 or 1612) minus the differential (5024)
the heat pump will resume operation.
•
Summer
When all heating circuits change to summer mode,
the heater performs DHW charging starting on the
next day. The heat pump therefore stays off in
summer mode.
Production of DHW by the heat pump will resume
only if at least one heating circuit changes over to
heating mode. In that case, the heater operating
mode is the same as described in the "Substitution"
setting.
Electric immersion heater : release
•
24h/day
The heater is continuously active regardless of time
programs.
•
DHW release
The heater is controlled according to "DHW release".
94
•
Always
DHW charging is always carried out by means of the
heater.
•
Cooling mode
When the heat pump operates in cooling mode, it is
possible to specify whether a DHW charging is to be
carried out via the heater, without cooling being
interrupted.
The DHW is prepared by the heater, if the heat pump
is in cooling mode or is not available (e.g. out of
order).
Information:
The DHW mode selection key also acts on the
heater. In order for DHW charging to take place, the
DHW key must be on.
Maintenance Document 1394-1