Advantage Maximum MG Series - Automatic Water Make-Up Service

Maximum Series Portable Chiller : Air & Water-Cooled : MG Series Instrument
update 08/02/2021
Page: 56
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
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. Whenthelevelsensorindicatesalowtanklllevelan
alarm signal is initiated. The unit will continue to operate
while in a low tank level state but an alarm screen will be
displayeduntiltheuidllisattherecommendedlevel.
Access to all operating parameters will be available
through the menu function.
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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.
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.Becertainprocessuidpressureis
relieved(coolantpressureis“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.
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
Figure 5.4B
Typical water make-
up level switch
Figure 5.4A