Troubleshooting Guide - TdA ZEWMBAD series Technisches Handbuch, Inbetriebnahme Und Betriebsweise

ZWEMBAD SERIES · AIR/WATER SYSTEM
Detecting Leaks:
⋅ Symptoms of gas leaks.
⋅ Leaks will cause a decrease in the refrigerant charge in the equipment. Low refrigerant charge may be the caused
by the following symptoms:
The evaporating temperature is very low. This may be also caused by an obstructed fluid line or the
1.
incorrect operation of the expansion valve.
2. The compressor is functioning on cycles which are too short.
Compressor is overheated: Gas leaks cause gas flow to be insufficient to cool the compressor. This may
3.
cause the tripping of the internal thermostat of the compressor.
4. The compressor operates continuously, there is not enough refrigerant to obtain the desired power, and
since the specified temperatures are never reached, the unit never shuts down.
⋅ In any case, it is better not to wait until a leak appears and service regularly the circuit.
Methods for Searching for a Gas Leak:
There are various tools on the market used in order to detect leaks, although not all of them are sufficiently sensitive
⋅
to certain types of refrigerants. It is very important to choose an adequate detector for the refrigerant used for this
equipment and that the maintenance guidelines by followed.
⋅ You can also use soap bubbles (liquid detergent in a spray bottle) to detect leaks.
⋅ Other methods such as halogen lighters and additives may also be used to detect leaks.
The R-407-C Gas:
⋅ The R-407-C is a NONFLAMMABLE gas; it has no flash point, and so is not subjected to the rules and regulations of
the transportation of inflammable gases.
⋅ The R-407-C does not irritate the skin, eyes or mucous membranes and does not produce and side-effects.
⋅ It has a very low level of toxicity for one or many repeated exposures; it does not cause cancer or mutations.
⋅ The R-407-C may cause freezing if it comes into contact with the skin, due to its immediate evaporation.
As with all hydrocarbons, whether they are halogenated or not, the R-407-C gas may, although it has a very low level of
toxicity, cause anaesthetic or preanaesthetic conditions if inhaled deeply and within a closed area.

10 TROUBLESHOOTING GUIDE.

The reasons why your heat pump may not function properly are mentioned below:
The unit does not start:
Operating switch tripped: Check there is no short circuit in the control panel, repair the possible short circuit.
⋅
⋅ Coil contactor does not activate: Verify that it is not burned, and replace it if it is. Verify the terminals which activate
the coil.
⋅ Thermal switch tripped: Verify the voltage of the line. Verify that the operating conditions are correct. Excessive
compressor consumption. Short circuit in the compressor.
⋅ Low pressure switch tripped: Verify that the pressure switch operates correctly and substitute if necessary. Verify
that the fan is operating correctly. Verify the refrigerant charge of the equipment (refrigerant leak, loss of refrigerant
fluids) in order to solve this problem; please refer to the refrigerant charge section.
Verify that there is sufficient ventilation around coils. Check for any obstruction of the cooling circuit and eliminate
⋅
the obstruction if necessary. Verify that the thermostatic valve is operating properly, checking the bulb has no gas
leaks and that the pressure inlet is free of obstruction. Replace if needed.
⋅ High pressure switch tripped: Verify that the pressure switch operates correctly and substitute if necessary. Check
the refrigerant charge (excess refrigerant) in order to solve this please refer to the refrigerant charge section. Check
for any obstruction of the cooling circuit and eliminate the obstruction if necessary. Verify there is a good water flow
through the condenser, checking there are no obstructions in the hydraulic circuit, the shut-off valves are open and
the purification pump operates properly (replace if needed).
© ZWEMBAD 2015. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT.
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