Advantage Engineering Maximum, Instruction Manual

Page: 48 / 80

MK Series Portable Chiller : Air-Cooled : HE INSTRUMENT
Page: 48
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 SOLENOID VALVE SERVICE
A. Maximum units with the water
make-up system use a solenoid
valve (figure 5.4A) to regulate flow
into the reservoir tank. The
solenoid valve is controlled by the
float switch.
B. Generally, solenoid valves fail due
to poor water quality, low water
flow, or defective valve elements.
C. The operator should follow this
procedure to service the make-up
solenoid valve:
1. Disengage process operations according to the procedure
outlined in
section 3.4 . The operator must be certain
process fluid temperature is under 100°F and pressure is
relieved (pressure gauge reads “0”) and water system flow
is shut off and all pressure relieved.
2. Disengage main power supply. The operator must verify the
POWER light on the
Maximum display is “off”.
3. Remove or open any access cover panel and set aside to
gain access to the cooling solenoid valve.
4. The operator must be certain all water system pressure is
relieved. Use the pressure relief valve mounted in the drain
manifold to relieve all pressure.
5. Identify the retaining screw
(figure 5.4B) on the
solenoid valve coil. Remove
the screw. Keeping all
electrical connections
intact, lift the coil off of the
enclosure tube and set
aside.
6. Use a pair of channel lock
pliers or a pipe wrench to
separate the bonnet
assembly from the valve body.
The plunger is “loose” inside the enclosing tube. Be certain
it is retained in the enclosure tube as the bonnet is
removed (figure 5.4C).
7. Identify the diaphragm assembly. Gently remove the
assembly from the valve body (figure 5.4D).
Coil
Figure 5.4B
Retaining screw
Typical water make-up
solenoid valve
Figure 5.4A