RIGID
HVA
C
CO.,
L
TD
*
[email protected] *
https://www.rigidchill.com
*
https://www.rigidhvac.com
3.2.6
Wire Connection between Cooler and Condenser.
Connect Cooler and Condenser with the two signal wire which is attached with the unit
Positive pole(+) connects the red wire of condenser, and Negative pole (-)connects black wire.
Cooling system high&low pressure pipeline connects condenser tightly fixed by the nut of aluminium joint
and cooler by expansion valve
Cooler drain pipe and high&low pressure pipeline is connected by ribbon
Please Don’ squeeze the drain pipe, otherwise it will influence drain away the water.
Cover the tube hole with rubber to prevent to damage the high&low pressure pipe.
3.2.7
Add refrigerant in vacuum
Firstly, check the high and low pressure pipe are connected well.
You can add 1.2～1.4MPa R134a refrigerant or nitrogen for leak test if necessary.
Connect pressure gauge with vacuum pump and high&low pressure charging valve
Open the high&low pressure charging valve in pressure gauge.
Then start the vacuum pump to pump vacuum at least 15minutes until it arrives to -0.1MPa
Close the valve, and stop the operation of vacuum pump.
Please keep it more than 5 minutes, to make sure whether the needles in the pressure gauge will come
back or not.
If the needles come back, then check the leak position, and start to vacuum pump again.
If not, start to charge, vent air from the vent hose at first, then open the high&low pressure charging valve
in pressure gauge, and add R134A refrigerant in 700g, cannot exceed 800g.
If the length of high&low pressure connecting tube is more than 5meters, then add refrigerant 30g per
meter.
