JOHNSON CONTROLS
182
FORM 150.72-ICOM7
ISSUE DATE: 10/22/2020
SECTION 10 – MAINTENANCE
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. Blow or
vacuum out the rinse water from the MCHX to
speed drying and prevent water pooling.
OPERATING PARAMETERS
Perform regular checks on the system to ensure that
operating temperatures and pressures are within limi-
tations, 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 set points.
Do not confuse JP1 on the IPU II (031-
02630) board with JP1 on the I/O (031-
02550) board.
THERMAL DISPERSION FLOW SWITCH
Check the sensor tip for buildup regularly, because it
can affect the sensitivity of the sensor.
In case of any buildup at the sensor tip, use a soft cloth
to remove it. Use vinegar as the cleaning agent to re-
move any stubborn buildup if necessary.
BRAZED PLATE HEAT EXCHANGER
(EVAPORATOR) HEATER
The internal power supply to the Evapo-
rator Heater is 120 VAC. Disconnecting
120 VAC 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, perform
periodic overall inspections on the unit to ensure prop-
er equipment operation. Investigate and correct imme-
diately items such as loose hardware, component op-
eration, refrigerant leaks, and unusual noises.
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