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8
Overcurrent Protection
The following overcurrent protection devices are approved for
use.
•
Time delay fuses
•
HACR type circuit breakers
These devices have sufficient time delay to permit the motor-compressor to start and accelerate its load.
Three Phase Compressor Rotation
Three phase compressors are power phase dependent and can
rotate in either direction.
Verify proper rotation for three phase compressors by ensuring
the suction pressure drops and discharge pressure rises when
the compressor is energized.
NOTE:
When operated in reverse, a three phase scroll compressors is noisier and its current draw
substantially reduced compared to marked values.
To correct, disconnect power and switch any two leads at the unit contactor and re-observe.
High Voltage Connections
Route power supply and ground wires through the high voltage port and terminate in accordance with the wiring diagram provided
inside the control panel cover.
Condensing unit control wiring requires 230 V, Comp, N, L, E from the indoor unit. Route control wires through the low voltage port
and terminate in accordance with the wiring diagram provided inside the control panel cover.
System Start Up
When opening valves with retainers, open each valve only until the top of the stem is 1/8” from the retainer. To avoid loss of
refrigerant, DO NOT apply pressure to the retainer. When opening valves without a retainer remove service valve cap and insert a
hex wrench into the valve stem and back out the stem by turn-
ing the hex wrench counterclockwise. Open the valve until it con-
tacts the rolled lip of the valve body.
NOTE:
These are not back-seating valves. It is not necessary to
force the stem tightly against the rolled lip.
Adequate refrigerant charge for the matching HSVTC evapora-
tor coil and 15 feet of lineset is supplied with the condensing
unit. If using evaporator coils other than HSVTC coil, it may be
necessary to add or remove refrigerant to attain proper charge. If line set exceeds 15 feet in length, refrigerant should be added at
.6 ounces per foot of liquid line.
NOTE:
Charge should always be checked using superheat when using a piston and subcooling when using TXV equipped indoor coil
to verify proper charge.
Open the suction service valve first! If the liquid service valve is opened first, oil from the compressor may be drawn into the
indoor coil piston, restricting refrigerant flow and affecting operation of the system.
After the refrigerant charge has bled into the system, open the liquid service valve. The service valve cap is the secondary seal for the
valves and must be properly tightened to prevent leaks. Make sure cap is clean and apply refrigerant oil to threads and sealing
surface on inside of cap. Tighten cap finger-tight and then tighten additional 1/6 of a turn (1 wrench flat), or to the following
specification, to properly seat the sealing surfaces.
POSSIBLE REFRIGERANT LEAK
To avoid a possible refrigerant leak, open the service valves until
the top of the stem is 3.2 mm (1/8”) from the retainer.
CAUTION
Use care when handling scroll compressors. Dome temperatures
could be hot.
CAUTION
NOTICE
Units with rotary or reciprocating compressors and non-bleed
TXV’s require a Hard Start Kit.
Summary of Contents for RR20AVAK9
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Page 25: ...25 APPENDIX LONG LINE SET APPLICATION R 410A ...
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Page 49: ...13 ا ً د عم فارغة ُركت ت الصفحة هذه ...
Page 59: ...23 والصيانة الخدمة ...
Page 61: ...410A R التكييف ألجهزة الطويلة الوصالت مجموعة استعمال الملحق 25 ...