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4. Basic Control Logic Specifications
HP unit operates to achieve the target heat capability 4.5kW to output 65
water once the power is on.
Conditions to start and end heating water are as stated below:
Conditions to
Start Operation
Condition to
End
However, operation will not be performed during the time set as the blockout time
on the timer setting panel.
Freeze Prevention Drive
To avoid fracture in freezing, HP unit starts heating water when the pipes get
below the specific temperature while Driving Mode is on (including hours set as
blockout time).
Operation
HP unit starts operation when either GC Inlet TH or Outlet TH detects
It will not start if the mode is set to the Off Mode.
When Driving Mode is on (including hours in blockout time)
Target Heat Capability: 4.5kW
Condition for Ending Freeze Prevention Drive: GC Inlet TH > 50
If the condition meets to that to heat water during the freeze prevention drive,
the operation shifts to water heating operation.
Air Exhaust Operation
If Tank TH A
by 2.5L/min before starting to heat water.
If Tank TH A > 30
(1) Tank TH A
45
(2) More than 24hrs passed since the last start of operation. (for
anti-Legionella purpose)
(3) Memory of last operation is lost. (First run after delivery, ROM
writing error, etc.)
(4) Electrical shutdown is occurred while HP unit is operating.
(5) The current time is 10.00 (24hr clock basis).
(6) HP unit was not operated by the condition (5) due to a limitation
of HPU operation. HPU operation starts once the limitation is
cancelled. The term limitation defines a condition where HPU
cannot be operated due to the electricity cutoff or the blockout time
setting.
HP unit starts when either of (1), (2), (3), (4), (5) or (6) above is
satisfied.
o
30
C at the start of water heating, HP unit runs the pump for 3min
o
C, the pump does not run before operation.
Sanden Heat Pump –– Service Technical Book
o
C (Lack in residual hot water in tank)
GC Inlet TH > 50
Page 7 of 48
o
C (fixed)
o
C
o
5
C or less.
o
C
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