Instruction manual

Maximum Series Portable Chiller : Air & Water-Cooled : M1 Series Instrument
Page: 48
ADVANTAGE ENGINEERING, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: [phone]
Service Department Fax: [phone]
Email: [e-mail]
5.4 AUTOMATIC WATER MAKE-UP SYSTEM SERVICE
A. The automatic water make-up system consists of a level switch
(gure5.4A)andasolenoidvalve(gure5.4B).Whenthetanklevel
is low the level switch signals the solenoid valve to open allowing
make-upwatertore-llthetank.
B. 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lm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.
C. 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uidpressureisrelieved(coolantpressure
gaugereads“0”)andwatersystemow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.
Typical water make-up
solenoid valve
Figure 5.4B
Typical water make-up level
switch
Figure 5.4A