Allied Air 4SCU20LX Руководство по установке - Страница 4
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Leak Check
Never use oxygen to pressurize or purge refrigerant
lines, fire or explosion can occur causing injury or
property damage
Refrigeration lines and indoor coil must be checked for leaks
after brazing and before evacuation. The recommended
procedure is to apply a trace amount of vapor refrigerant
(approximately two ounces or 3 psig) into the line set and
indoor coil, then pressurize with 150 psig of dry nitrogen.
Use a refrigerant leak detector to check all joints. The
system may also be checked for leaks using a halide torch
or pressure and soapy solution. After completion of leak
check, reclaim all pressure from system before evacuation.
Evacuating and Charging Instructions
It is against the law to release refrigerants into the
atmosphere. Refrigerant can cause injury or death if
inhaled.
These outdoor units are pre-charged at the factory with
adequate refrigerant for 15 feet of refrigerant tubing.
1. Connect the vacuum pump to the center hose of the
manifold gauge set, the low-pressure manifold gauge
to the vapor service valve and the high pressure
manifold gauge to the liquid service valve.
2.
The valves should be kept in the (closed) position.
This will allow evacuation of the refrigeration lines and
the indoor coil, without disturbing the factory charge in
the outdoor unit.
3.
Follow the vacuum pump manufacturer's instructions.
Allow the pump to operate until the system has been
evacuated down to 300 microns. Allow the pump to
continue running for an additional 15 minutes. Turn
OFF the pump and leave the connections secured
to the two (2) service valves. Hold for 5 minutes, if
the system fails to hold 1000 microns or less, check
all connections for tight fit and repeat the evacuation
procedure.
4.
Isolate the vacuum pump from the system by closing
the shutoff valves on the gauge-set. Disconnect the
vacuum pump.
5.
After evacuation of the connecting lines, fully open the
service valves.
Page 4 of 11
WARNING
WARNING
Place service valve cap and torque to:
Valve Size
3/8 Valve
3/4 Valve
7/8 Valve
Electrical Connections
Electrical Shock Hazard!
Turn OFF electric power before connecting
unit, performing any maintenance or
removing panels or doors. More than one
disconnect may be required to turn off all
power.
FAILURE TO DO SO COULD RESULT IN
BODILY INJURY OR DEATH.
Electric Hazard/High Voltage
Wait 5 minutes after disconnecting power components
may hold electric charge.
Be sure to check all local codes to determine that the unit
is installed in accordance with local requirements. Consult
the National Electric Code for wire size requirements. Use
60° C or higher copper wires only. Always provide ground
connections to the outdoor unit. Power supply must agree
with the rating on the unit nameplate.
Provide line voltage power supply to unit from a properly
sized disconnect switch. Route power and ground wires
from disconnect switch to unit. Line voltage connections
are made at the line side of the contactor in the control box
of the outdoor unit. Follow the wiring diagram attached to
inside of the access panel.
Proper circuit protection recommendations are indicated
on Unit Rating Plate. Time delay fuses are required to
prevent blowing due to starting current (the current in rush
when equipment starts is referred to as the Locked Rotor
Amps or LRA).
Issue 1831
Torque (ft.-lb.)
8-11
12-15
15-20
Table 2. Torque Table
WARNING
WARNING
507523-01