1592015610 User manual IC200D EVO GB rel1.0 10.11.2015_rev10
IC200D
99/192
38.5 DOMESTIC HOT WATER PRODUCTION: VALVES IN GAS CIRCUIT ___ FS01=2
(AIR/WATER, WATER/WATER UNIT)
Domestic hot water operation when the unit is producing hot water
38.5.1
When domestic hot water production is required (and it has priority), the sequence of operation is the
following:
the domestic hot water pump is switched on
after a delay of FS27 seconds the valve 1 is activated
after a delay of FS10 seconds the domestic hot water valve 2 is switched off
Domestic hot water is produced until the FS03 set-point is reached.
Once the domestic hot water set-point is reached:
domestic hot water valve 2 is switched on
after a delay of FS10 seconds the domestic hot water valve 1 is switched off
after a delay of FS28 seconds the domestic hot water circulation pump is switched off
Condenser fans are managed normally.
The defrost takes priority over the production of domestic hot water.
If the controller determines the need for a defrosting cycle during the production of domestic hot water, the
Ichill stops the domestic hot water operation to activate the defrost procedure:
all compressors and heaters are stopped
the valve 2 is activated
after the FS10 delay the domestic hot water valve 1 is switched off
after a delay of FS28 seconds the domestic hot water pump is switched off
The defrost can now start as per the normal procedure.
At the end of the defrosting cycle:
If there is a need to produce domestic hot water, the compressors and any heating elements will be
switched on. After the FS11 delay from the end of the dripping phase, domestic hot water valve 1 is
enabled and, after the FS10 delay, domestic hot water valve 2 is switched off.
If there is no need to produce domestic hot water, the controller continues with normal heat regulation.
- Domestic hot water operation when the unit is producing cold water
38.5.2
When the production of hot domestic hot water is required, the sequence of operation is different and
depend on the status of the compressors:
a) One or more compressors are switched on for production of chilled water
If the production of domestic hot water is required during operation in chiller mode:
the domestic hot water circulation pump is switched on
after a delay of FS27 seconds the domestic hot water valve 1 is switched on
after the FS10 delay the domestic hot water valve 2 is switched off
The following two cases could occur during the production of domestic hot water:
The domestic hot water set-point is reached when the chiller is working (the chiller set-point is not
reached):
the domestic hot water valve 2 is switched on
after the FS10 delay the domestic hot water valve 1 is switched off
after a delay of FS28 seconds the domestic hot water circulation pump is switched off
At the end of this phase, if necessary, the machine continues to regulate in chiller mode.
The regulation temperature reaches the chiller set-point (parameter ST01) and the domestic hot
water production is working:
the domestic hot water circulation pump stays on
the domestic hot water valve 2 is switched on
after the FS10 delay the domestic hot water valve 1 and the compressors are switched off
after the DF07/2 delay the 4-way valve status is reversed
after dF07/2 the compressors are switched on again to produce hot domestic hot water
