Advantage Sentra SK Series, Инструкция по эксплуатации

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Temperature Control Units : Sentra with VE Series Instrument
Page: 43
Advantage Engineering, Inc.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: 317-881-1277
Service Department Fax: 317-885-8683
www.AdvantageEngineering.com
5.3 COOLING VALVE SERVICE
A. The unit uses the PVT
TM
(Pulsed Valved Technology) solenoid valve (figure 5.3A) as the
cooling valve. The solenoid valve is controlled by the instrument.
B. Generally, the PVT
TM
valve require service for a failed coil or more often it will not fully
close because debris from poor make-up water quality is in the valve mechanism.
C. To service the solenoid valve follow the procedure below.
1. Disengage process operations according to the procedure outlined in section
3.4. Be certain process fluid pressure is relieved (coolant pressure gauge reads
“0”) and water system flow is shut off.
2. Disengage main power supply. The operator must follow all lockout/tagout
procedures.
3. Remove or open any access cover panel and set aside to gain access to the
make-up solenoid valve.
4. The solenoid valve can be disassemble by removing the 4 retaining screws.
5. Keeping all electrical connections intact, lift the coil and top solenoid base
assembly and set aside.
6. Note the arrangement of the core spring
and core assembly, diaphragm spring
and diaphragm assembly. (See diagram.)
7. Clean all components as required.