JOHNSON CONTROLS
174
FORM 150.72-ICOM6
ISSUE DATE: 12/29/2017
SECTION 10 – MAINTENANCE
2. Rinse the MCHX with tap water. Do not use
MCHX cleaners. Rinse the coil from the inside
out, running water through every passage in the
heat exchanger surface until it is clean. Use a gen-
tle spray from a spray nozzle with a plastic end or
put your nger on the end of the spray nozzle to
reduce impact and provide a gentle spray.
3. Because of the n geometry, the condenser
MCHX retain water more than tube and n style.
It is generally recommended to blow or vacuum
out the rinse water from the MCHX to speed dry-
ing and prevent water pooling.
OPERATING PARAMETERS
Regular checks of the system should be preformed
to ensure that operating temperatures and pressures
are within limitations, and that the operating controls
are set within proper limits. See SECTION 8 – UNIT
OPERATION, SECTION 6 – COMMISSIONING, and
SECTION 4 – INSTALLATION of this manual.
ON-BOARD BATTERY BACK-UP
The Real Time Clock chip (U5) located on the 031-
02630 IPU II board that maintains the date/time and
stores customer programmed setpoints.
Do not confuse JP1 on the IPU II (031-
02630) board with JP1 on the I/O (031-
02550) board.
BRAZED PLATE HEAT EXCHANGER
(EVAPORATOR) HEATER
The internal power supply to the Evapo-
rator Heater is 120VAC. Disconnecting
120VAC power from the unit, at or below
freezing temperatures, can result in dam-
age to the evaporator and unit as a result
of the chilled liquid freezing.
OVERALL UNIT INSPECTION
In addition to the checks listed on this page, periodic
overall inspections of the unit should be accomplished
to ensure proper equipment operation. Items such as
loose hardware, component operation, refrigerant
leaks, unusual noises, etc. should be investigated and
corrected immediately.
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