Start-Up And Commissioning; Setting The Water Temperature - Johnson Controls SABROE WHC 2.1 Installation And Operating Manual

5. Start-up and commissioning

The circulation system must be charged with water and air purged before voltage is applied to
the system.
Warning!
Scalding risk. The water in the system is hot both during operation and standstill.

Setting the water temperature

Standstill (heating mode)
While the compressor is stopped, the WHC system is in heating mode, which means that the
heating element is regulating the temperature. The temperature of the circulated media must
be minimum 10°K above the corresponding R717 equalizing pressure (saturated temperature)
at standstill to avoid condensation inside the compressor.
For the WHC system, the equalizing pressure is defined as the same as the compressor pres-
sure 15 minutes after stopping the compressor.
For Sabroe HeatPAC, ChillPAC and DualPAC, the approximate equalizing pressure can be
calculated by this formula: P
The default set point (St1) for the heating element is 60°C.
To change the heating element set point (St1):
• Press Set: the display shows St1 and the current value of St1
• Press ▼ or ▲ to reach the desired value
• Press Set to confirm the new value of St1
• The display returns to the standard view.
Running (cooling mode)
While the compressor is running the WHC-system is in cooling mode, this means that the sole-
noid valve is regulating the temperature. The controller must be set so the cooling water can
hold the compressor oil and discharge temperature below the maximum operating limits.
The default set point (St2) for the solenoid value is 45° C, which will be okay for most
conditions.
To change the heating element set point (St2):
• Press Set twice slowly: the display shows St2 and the current value of St2
• Press ▼ or ▲ to reach the required value
• Press Set to confirm the new value of St2
• The display returns to the standard view.
Note: If the WHC system has been bought separately and a compressor running signal is not
available, the set point for the heating element (St1) must be set 5° K lower than the solenoid
valve set point (St2). If not, the heating element will be on at the same time as the solenoid
valve is energized (cooling and heating at the same time).
= 0.18 x P
equal discaharge
Installation and operating manual - Sabroe WHC circulation system
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+ P -1, [bara].
suction
Start-up and commissioning
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