48
Operation
Unit operations should be controlled with
thermostat or unit controller, never at the
main power supply, except for emergency or
complete shutdown of the unit.
Steam or Hot Water Preheating
Operation
Valve control for steam and hot water
heating coils are by others. Heating is
accomplished by passing steam or hot water
through the steam or hot water coil
assembly.
Chilled Water or Non-Compressorized
DX Cooling Operation
Controls for chilled water cooling coil and
non-compressorized DX coil are by others.
Packaged DX Cooling Operation and
Control
When a call for cooling (G and Y1, Y2, etc.)
is made the supply fan motors and
compressors will energize.
Maintenance
(See back of the manual for maintenance
log.)
At least once each year, a qualified service
technician should check out the unit. Supply
fans, evaporator coils and air filters should
be inspected monthly.
Periodically during operation, it is necessary
to perform routine service checks on the
performance of the unit. This includes
checking of the air flow, the air filters,
condenser water flow and refrigerant charge.
See Startup section for information on air
flow adjustment and refrigerant charge
adjustment.
DX Cooling
Set unit controls to cooling mode of
operation with supply fans on. Check the
fans
for
correct
operating
direction,
amperage and voltage. Check compressor
operation, rotation, amperage and voltage to
the unit nameplate (check the amperage on
the load side of the compressor contactor).
Condensate Drain Pans
Drain pans will have moisture present and
require
periodic
cleaning
to
prevent
microbial growth. Cleaning of the drain pans
will also prevent any possible plugging of
the drain lines and overflow of the pan itself.
Cleaning of the drain pans and inside of the
unit should be done only by qualified
personnel.
Improper
installation,
adjustment,
alteration, service or maintenance
can
cause
property
damage,
personal injury or loss of life. Startup
and service must be performed by a
Factory Trained Service Technician.
A copy of this IOM should be kept
with the unit.
WARNING
COMPRESSOR CYCLING
5 MINUTE MINIMUM OFF TIME
To
prevent
motor
overheating
compressors must cycle off for a
minimum of 5 minutes.
5 MINUTE MINIMUM ON TIME
To maintain the proper oil level
compressors must cycle on for a
minimum of 5 minutes.
The cycle rate must not exceed 6
starts per hour.
WARNING
Содержание SA-023
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Страница 20: ...20 Figure 2 One Piece Single Unit Lifting Details ...
Страница 21: ...21 Figure 3 Two Piece Single Unit Coil Section Lifting Details ...
Страница 22: ...22 Figure 4 Two Piece Single Unit Fan Section Lifting Details ...
Страница 23: ...23 Figure 5 One Piece Dual Unit Lifting Details ...
Страница 24: ...24 Figure 6 Two Piece Dual Unit Coil Section Lifting Details ...
Страница 25: ...25 Figure 7 Two Piece Dual Unit Fan Section Lifting Details ...
Страница 27: ...27 Figure 8 Dual unit without splices and before being bolted together Figure 9 Dual Unit Assembly Details ...
Страница 28: ...28 Figure 10 Dual unit with splices after being bolted together ...
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