Electrical Panel; Refrigerant Charge - TdA ZEWMBAD series Technisches Handbuch, Inbetriebnahme Und Betriebsweise

ZWEMBAD SERIES · AIR/WATER SYSTEM
FAN:
Verify the flows of the fan each year.
Clean the louvers of the fan as well as the protection grill regularly.

ELECTRICAL PANEL:

Verify all electrical connections.
Verify that there is no over-heating of the electrical terminals.
Verify that the protection systems operate correctly.
Verify that the regulator operates correctly and verify the temperature with a mercury thermometer (calibration
probe).

9 REFRIGERANT CHARGE.

For the procedures described below, we recommend you contact a professional specialised in heating and air
conditioning units.
Draining the Cooling Circuit:
It is imperative to drain the cooling circuit before charging the refrigerant.
- First draining procedure:
1st. Connect the gauge tubes to the intake pressure lines of the circuit (low pressure) and to the return
pressure lines (high pressure).
2nd. Connect the main line of the gauge to the vacuum pump.
3rd. Open all the valves, including the solenoid and the regulating valves.
4th. Open the valves of the gauge (LO = low pressure valve / HI = high pressure valve).
5th. Activate the vacuum pump and wait until the circuit is completely drained.
6th. Close all valves or stopcocks and disconnect the vacuum pump.
Refrigerant Gas Charge:
The equipment uses R-407-C class refrigerant, which is a blend of 3 different gases with different properties.
This is the reason why the gas taken from the refrigerant bottle must be introduced in the low-pressure circuit by means of
a charger (expansion system).
After having discharged the cooling circuit, and after having installed the charger and connected the flexible tubes of the
gauge to the high and low-pressure circuits, we can proceed with the charge:
1st. Connect the main line of the gauge to the R-407C bottle stopcock.
2nd. Open the bottle stopcock and purge the section of tubing.
3rd. Open the high-pressure and the low-pressure valves.
4th. Pressurise the equipment to equal the pressure of the bottle.
5th. Close all gauge valves.
6th. Start the unit.
7th. Open the low-pressure valve until the pressure is 1 bar above the trip point of the low-pressure switch.
8th. Once in a while, close the LO valve of the gauges in order to confirm the real pressure of intake.
9th. Verify that the outflow pressure is not above the normal range for normal working conditions.
10th. When the correct weight of refrigerant has been charged, close the LO valve.
11th. When the equipment is functioning according to the specified working conditions, close the valve of the
charging bottle and disconnect the tubes taking precautions regarding gas purge.
12th. Place the caps on the supply and return lines of the compressor.
© ZWEMBAD 2015. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT.
ENGLISH
Page 38 of 234