CTA
Instruction Manual
MPE
Reference: MT0027DA
This document may be modified without prior notice
13
Revision date: 11/05/06
Even partial reproduction is prohibited without authorisation in writing
7.2
Solenoid valve maintenance *
General comments
The solenoid valve must always be protected by a filter to ensure that solid particles do not prevent it from
opening and closing correctly. If particles do get through the filter and cause faulty operation of the solenoid
purge valve, it is must be dismantled and cleaned.
Procedure
1.
Close the manual valve on the purging line (see refrigeration/pneumatic circuit diagram)
2.
Disconnect the solenoid valve power supply
3.
Disconnect the solenoid valve from the pipework and clamp it in a vice
4.
Unscrew the coil lock nut and take it off the plunger
5.
Unscrew the plunger from the valve seat
6.
Check the O ring and the other components. Clean carefully.
7.
Re-assemble the valve by reversing operations 1 to 5;
Do not over tighten the coil lock nut as this could prevent the valve from closing.
8.
Refit the solenoid valve to the pipework, respecting the direction of the air flow indicated by an arrow on
the body.
9.
Reconnect the power supply to the solenoid purge valve.
10.
Open the manual valve on the purging line
*You must comply with the recommendations at the beginning of this chapter.
8
Test and maintenance scheduling
Frequency of intervention
Every
day
Every
month
Every 6
months
Every
year
see
§
Check for alarm messages.
¦
Check that the digital display panel indicates a value between 0 and
4C° (0 and 7° F)
¦
Test the purge
¦
3.4
Test the compressed air inlet temperature and compare to the maximum
value on the manufacturer's plate.
¦
Clean the purge filter *.
¦
5.1
Check that the temperature of the ambient air complies with minimum
and maximum values shown on the manufacturer's plate. Check that
the room is well ventilated.
¦
Check that when operating the temperature of the upper part of the
compressor is not too high (50C° Max). Test that the current consumed
by the drier complies with values on the manufacturer's plate.
¦
Clean the solenoid purge valve *
¦
5.2
Visually inspect the refrigerating circuit, the state of pipework and look
for oil slicks which can indicate a loss of refrigerant gas* pressure.
¦
4.2
Test the pipework connections.
¦
4.2
Test the condition of the electrical contacts and connections *.
¦
4.2
Check that the fan is not noisy.
Clean the condensing unit fins with a sponge or a clean compressed air
jet. Check that the grids are not dirty or clogged *.
¦
4.2
Clean the condensing unit fins with a non-aggressive detergent *.
¦
4.2
