Carrier 50NF, Installation, Operation And Maintenance Instructions

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9
Vertical package air conditionners
Check the connection air tightness.
A
Condensates pan
in depression
A
Siphon drain
Slight slope
5/1000
To drainage
Siphon principle scheme
Carry out the assembly of the same one following the attached
principle scheme:
Pan in overpressure:
• It is installed to avoid the access through the drain tubing of bad
smells.
Pan in depression:
• Besides the previous application, the water must be sucked from
the pan.
• For the correct design of the siphon, the dimension “A” should be
at least, the double of the depression to which is the condensates
pan.
• The drain tubing must be slightly sloped to ease circulation towards
the drain.
• To control the drain it is recommended to insert a funnel in the
pipelines toward the drainage.
Note: The original diameter of the tube must be respected. No
reduction can be made.
9. S
AFETY ELEMENTS
High pressure pressostat
Connected to the compressor discharge, it will
stop its operation when the pressure at that point
reaches the setpoint. It disconnects at 29 bar
and it is automatically reactivated.
Caution: Threaded and without schrader valve.
Automatic switch in the control circuit
Magnetothermal switch that protects the operation circuit against
continuous surges as well as against high currents of short duration
(short circuits).
Fans and compressors protection
Both the fans and the compressor have a thermal protection for the
motor. Its mission is to protect the motor against an excessive heating
caused by a surge.
Main door switch
By using a mechanical device, it impedes access to the electric panel
when the unit is with voltage. Available in all units.
Low pressure pressostat
When connected to the intake compressor, it
will stop operating when the pressure at this
point drops below the tare value (caused by
obstructions in the circuit, excessive dirt in the
fi lters, fan stop or ice formation in the evaporator). It disconnects at
0.5 bar and resets automatically
Magnetothermals for line protection
They are located at the beginning of the power lines of the compressor
and motorfans to protect them.
Safeties at the compressor
The type compressor that these units as standard have the following
safeties:
- Non-return valve built into the compressor.
- Temperature probe for the discharge from the compressor to protect
the unit with discharge temperatures greater than 135ºC.
Clogged fi lter detector (optional)
Differential pressostat for indication of maintenance to fi lters. Automatic
reactivation.