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4 Expansion vessel
[Upper limit water volume of the system]
The Mono bloc unit has a build-in Expansion Vessel with 10 L air capacity and initial pressure of 1 bar.
o
Without antifreeze agent condition
Total amount of water in the system should be below 200 L.
If the total amount of water is more than 200 L, please add expansion vessel (field supply).
o
With antifreeze agent condition
In the case of using antifreeze agent, expansion rate ɛ is different depending on its maker.
Please refer to the antifreeze agent maker for the expansion rate ɛ before calculate the upper limit water
volume of the system.
The expansion vessel capacity required for the system can be calculated from the formula below.
V : Required gas volume <expansion vessel volume L>
Vo : System total water volume <L>
: Expansion rate 5 60˚C = (depends on antifreeze agent used)
P
1
: Expansion tank filling pressure = (100) kPa
P
2
: System maximum pressure = 300 kPa
- ( ) Please confirm at actual place
- The gas volume of the sealed type expansion vessel is presented by <V>.
It’s advised to add 10% margin for required gas volume of calculation.
V =
x
Vo
1 -
98 +
P
1
98 +
P
2
з
з
[Adjustment of the initial pressure of the expansion vessel when there is a difference in
installation height]
If the height difference between the Mono bloc unit and the highest point of the system
water circuit (H) is more than 7m, please adjust the initial pressure of the expansion
vessel (Pg) according to the following formula.
Pg= (H*10+30) kPa
5 RCCB
Ensure the RCCB set to “ON” condition before check RCCB.
Turn on the power supply to the Mono bloc unit.
This testing could only be done when power is supplied to the Mono bloc unit.
WARNING
Be careful not to touch parts other than RCCB test button when the power is supplied to Mono bloc unit. Else, electrical shock
may happen.
o
Push the “TEST” button on the RCCB. The lever would turn down and indicate “0”, if it functions normal.
o
Contact authorized dealer if the RCCB malfunction.
o
Turn off the power supply to the Mono bloc Unit.
o
If RCCB functions normal, set the lever to “ON” again after testing finish.
6 Test run
Before test run, make sure below items have been checked:-
a. Pipework are properly done.
b. Electric cable connecting work are properly done.
c. Mono bloc unit is filled up with water and trapped air is released.
Antifreeze agent must be added into water circuit to prevent freezing of water when outdoor ambient
temperatures is low. Recommended antifreeze:
Propylene glycol: 40% (equivalent to -20°C)
o
Set ON to the Mono bloc unit and RCCB 2. Then, for remote control operation please refers to (Mono
bloc) Air-to-Water Heatpump’s operation instruction.
Note:
During winter, turn on the power supply and standby the unit for at least 15 minutes before test run.
Allow sufficient time to warm up refrigerant and prevent wrong error code judgement.
For normal operation, Water Pressure Gauge reading should be in between 0.05 MPa and 0.3 MPa.
After test run, please clean the Magnetic Water Filter Set. Reinstall it after finish cleaning.
7 Water flow of water circuit
Confirm the maximum water flow during main pump operation not less than 15 l/min.
*Water flow can be check through service setup (Pump Max Speed)
[Heating operation at low water temperature with lower water flow may trigger “H75” during defrost process.]
