14
MAMM-WSHP-IOM-1KA (September 2011)
Proper maintenance is important to provide the most
efficient operation and longest life for your equipment.
The following points are to serve as a general guide.
Always consult with your maintenance contractor with
regard to the specific requirements of your own installa-
tion.
The following should be checked only by a competent
contractor.
Contactor Points:
Check contactor points twice a year
to see that they are not burned or pitted as a result of
low voltage, lightning strikes, or other electrical difficul-
ties.
Water System
:
The water circulating pump should be
checked and cleaned so that it is operating normally.
The 30 mesh strainer should also be cleaned at this
time. Clogged coils lead to high head pressures and
inefficient operation. If coil is limed, a cleaning treat-
ment may be necessary. Water coils should be
checked yearly for liming or clogging.
Brazed Plate Heat Exchanger Cleaning:
When the
likelihood of fouling is high (for instance, when hard
water is used), clean the exchanger by circulating a
cleaning liquid through it. Use a tank with a weak acid
General Maintenance
for this clean-in-place (CIP) process. A five-percent
solution of phosphoric acid is an effective choice for
most units. If the exchanger is cleaned frequently, use
a five-percent solution of oxalic acid.
For best results, the cleaning solution flow rate should
be at least 1.5 times the normal flow rate, preferably in
backflush mode. Before restarting, flush the unit with
plenty of fresh water to purge any remaining acid.
Clean at regular intervals.
Improper Unit Functioning:
If unit is not performing
properly, several readings of temperature, pressure
and electrical characteristics need to be taken. The
normal required troubleshooting information is listed on
the Check, Test and Start Form on
page 16
.
Performance Measurements:
Recording of perform-
ance measurements of volts, amps, and water tem-
perature differences (both heating and cooling) is rec-
ommended. A comparison of logged data with start-up
and other annual data is useful as an indicator of gen-
eral equipment condition.
Periodic lockouts almost always are caused water
problems. The lockout (shutdown) of the heat pump is
a normal protective result. Check for dirt in the water
system, water flow rates, and water temperatures.
DANGER!
Electric shock hazard. Turn of all power before
servicing. Failure to do so may result in severe
personal injury or death.
NOTE:
DO NOT
place refrigeration gauges on system for
Check, Test and Start procedure. They should be
used for major service only.
Mammoth brand products are serviced by Authorized
Service Providers. For service support, contact Mam-
moth at 952-358-6618 or [email protected].
Parts and Service Support
Parts for Mammoth brand products are available by
contacting your local representative. For assistance
locating your Mammoth representative, call 952-358-
6600 or e-mail [email protected].
