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Split Inverter Air-to-Water Heat Pump
Auxiliary Electric Heater Operation
When parameter
H03
is set to
1
, the electric heater function is enabled.
The heater will energize when
all (5)
of the below conditions are met.
1. The flow switch has been closed for a minimum of 1 minute.
2. The heater overtemp switch is closed.
3. The compressor is running at 80 Hz or above.
4. The return water temperature is less than
R02
minus
R05
(in heating) or
R11
minus
R12
(in DHW)
5. The ambient temperature is below R08 and all above conditions have been met for
R09
minutes.
Or
the ambient temperature is
below
R10
.
The heater will de-energize when
any
of the below conditions are met.
1. Parameter
H03
is set to
0
2. The return water is greater than
R02
minus
R05
(in heating) or
R11
minus
R12
(in DHW)
3. The compressor speed is below 50 Hz
4. The ambient temperature rises above
R08
plus 4°F
5. The flow switch opens
6. The heater overtempt switch opens
The heater will operate energize in Defrost operation when
all (3)
of the following conditions are met.
1. Parameter
D10
is set to
1
2. The heater overtempt switch is closed
3. The flow switch is closed.
Domestic Hot Water Operation (Optional configuration)
The SIS-060 can be configured to provide heat to a Domestic Hot Water System.
The plumbing connections are shown in the Typical System Diagram, Figure 3.11
Notice:
It is mandatory that the domestic water flow is isolated from the hydronic water flow through the heat pump, by a suitable
heat exchanger rated for potable water use. The heat exchanger inside the SIS-060 is not suitable for contact with potable water.
Control Parameter Settings:
Setting the parameter H11 to a value of 1 enables the DHW mode.
Parameter R11 is the DHW setpoint. This is the temperature of the isolated potable water loop, not the hydronic loop passing through
the SIS-060 Heat Exchanger.
Parameter R12 is the Start Differential for DHW operation. When the measured temperature falls below R11 minus R12, the DHW
function will start.
Parameter R13 is the End Differential for DHW operation. When the measured temperature rises to R11 plus R13, the DHW function
will end.
System wiring:
Place a 10k NTC Thermistor in the Heated portion of the Potable Water circuit and wire it to the AI/DI 05 inputs of the indoor control
according to the Indoor Module Wiring Diagram, Figure 4.2.
Connect a DPDT 120V relay between the output OUT3 and Neutral points according to the Figure 4.2 The contacts of this relay are
used to energize the THREE-WAY VALVE and DHW CIRCULATOR.
Operation:
The DHW function will operate independently of the Heating and Cooling operation. The controller will constantly monitor the DHW
temperature, and when if falls below the threshold of the Start Differential, the control will send a 120V signal to the DHW relay, and
operate in heating mode to reach the setpoint temperature.
The DHW operation takes priority over Heating or Cooling, and will interrupt those functions when called upon. When the DHW
temperature has been satisfied, the SIS-060 will resume Heating or Cooling operation as necessary.
Operation