Stulz ASR 682 A2 - Strength Pressure Test; Tightness;Pressure Test; Filling the Refrigerant Circuit

/11.2015/G17D
23
TCE
PSL
PZH
EN
- Systems without refrigerant receiver or sight glass must always be filled according to weight.
- Systems with refrigerant receiver should be filled according to weight but can also be filled by checking the sight
glass.
If you use the refrigerant R410A, note that R410A is a binary blend. Take care that you add refrigerant
in a liquid state, as the ratio of the refrigerant components changes if one of the two compounds
passes over into the gaseous phase.
6.2.1.5 Filling the refrigerant circuit
- Before the system is filled with refrigerant, it must be clean and dry inside.
- Connect the unit electrically as described on top of page 31 and following pages.
- Turn the main switch to the ON position (the C7000 controller should now be in the Stop mode).
- Switch on the control-circuit fuses.
- Do not switch on neither power switches nor the controller.
Compressor
Condenser
Non-return valve
(option)
Receiver
Safety valve
A/C unit
external installation
Open stop
valves !
C7000AT:
- Select the Config menu.
- Enter the password.
- Go to menu "Components/Manual
oper./Cooling/Valves.
- Change the parameter in the column
"EN" line "EEV 1" from "0" to "1".
- Set the parameter in the column
"Value" of the same line to 100%.
C7000IOC:
- Enter the command:
"eev 1 hand 1" and
"eev 1 handon 100".
The expansion valve is now completely open.
- Open the stop valves.
- The refrigerant circuit is filled with a nitrogene filling under atmospheric pressure. Evacuate the refrigerant circuit
by the Schrader valves until approximately 0 bar.
- Fill the refrigerant circuit with refrigerant by the Schrader valves.
6.2.1.3 Strength pressure test
The compressor has been strength-tested in the factory. It is not necessary for the customer to strength- or leak-test
the compressor again.
6.2.1.4 Tightness/pressure test
Use only dry nitrogen for pressure testing of the refrigerant circuit.
Do not subject the compressor to dry air. Otherwise you risk a bearing malfunction!
A/C units with On/Off compressor