Johnson Controls DSH Series, Инструкция по установке, эксплуатации и обслуживанию

Страница: 34 / 36

FORM 145.32-IOM4 (818)
34
MAINTENANCE / SERVICE
DISCONNECT AND LOCK OUT
POWER WHEN SERVICING UNIT.
FAILURE TO DO SO MAY RESULT IN
PERSONAL IN-JURY OR DEATH DUE
TO ELECTRICAL SHOCK.
Exercise care when working around the
sharp metal edges of door panels or door
frames, etc. These edges can cause
injury.
EVAPORATOR AND CONDENSER COILS
Inspect the evaporator coil at filter change intervals.
Inspect the condenser coil at least semi-annually. A
dirty condenser coil will result in elevated condensing
pressures and poor unit performance. Dirty or clogged
evaporator coils causes low suction pressure and lost
capacity. If the coils appear dirty, they should be
cleaned using a mild detergent or a commercial coil
cleaning agent.
REFRIGERANT CIRCUIT(S)-
With the unit operating, check and record the
compressor discharge and suction pressures. The
compressor running current should also be recorded. A
maintenance log of these readings can indicate if the
unit is operating within its normal limits. Abnormal
readings should be investigated, and the Cause
corrected.
BLOWERS -
Inspect both the evaporator and condenser blowers at
each regular service interval. Clean blower wheels as
needed. Bearings are permanently sealed ball type,
and do not require lubrication. Check bearings for any
signs of wear (movement between inner and outer
races). Ensure bearing locking collars are secure to the
shaft, and that collar locking screw is properly set.
Check that the blower wheel is tight on the shaft, and
that the hub set screws are tightened to the proper
torque.
DRIVE BELTS -
Examine belts periodically for wear. Glazed areas on
the drive surfaces indicate overheating due to belt
slippage. Ideal tension is the lowest tension at which
the belt will not slip under peak load conditions. Over-
tensioning shortens belt and bearing life (see section
‘Blower Speed Adjustment’).
The tension on the belt should be adjusted for a
deflection of 1/64 of an inch per inch of belt span, with
the appropriate force applied at the midpoint of the
span. Tension “New” belts at the maximum value
indicated. Used belts should be maintained at the
minimum value.
FILTERS -
Inspect filters monthly and replace as necessary. Use
UL Class 2 rated filters. Factory supplied filters are
medium efficiency, extended surface pleated type rated
to MERV 7. Replacements should be of the same type,
to maintain optimum airflow performance. Filter sizes
are as follows:
FILTERS
Unit Model Qty - Size
DSH024C 2 - 25x14x2
DSH036C 2 - 25x14x2
DSH048C 2 - 25x16x2
DSH060C 2 - 25x16x2
DSH096B 4 - 20x16x2
DSH120B 4 - 20x16x2
LD13547
BELT TENSION ADJUSTMENT
DEFLECTION FORCE VERSUS DRIVE BELT CROSS-SECTION