Advantage BC-N4 Series, Инструкция по эксплуатации

Страница: 42 / 64

BC-N4 Glycol Chiller
Page: 42
ADVANTAGE ENGINEERING, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: 317-881-1277
Service Department Fax: 317-885-8683
Email: service@AdvantageEngineering.com
5.4 AUTOMATIC WATER MAKE-UP SYSTEM service (Optional)
A. The automatic water make-up system is an optional available on units installed in
non freeze climates.
B. The automatic water make-up system consists of a level
switch and a solenoid valve. When the tank level is
low the level switch signals the solenoid valve to open
allowing make-up water to re-fill the tank.
C. Level switch maintenance and service.
1. The level switch contacts engage and disengage
the water make-up solenoid valve.
2. Poor water quality can allow debris or a film
build-up on the level switch contacts which
can impair operation. Clean the contacts on a
regular basis. If cleaning the contacts does not
remedy the problem the level switch must be
replaced.
D. Make-up solenoid valve service.
1. The make-up solenoid valve may 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.
2. To replace the coil, disengage power from the unit following all lock-out tag-out
procedures. Remove the wires from the failed coil and remove the coil from the
valve stem. Install the new coil on the stem and reconnect the wires.
3. To service the solenoid valve follow the procedure below.
a. 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.
b. Disengage main power supply. The operator must follow all lockout/
tagout procedures.
c. Remove or open any access cover panel and set aside to gain access to
the make-up solenoid valve.
d. The solenoid valve can be disassemble by removing the 4 retaining
screws.
e. Keeping all electrical connections intact, lift the coil and top solenoid
base assembly and set aside.
Typical water make-up solenoid valve
Typical water make-up level switch