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Capacity
and Dimensions Table
- If possible, pump
down system and lock existing refrigerant in the receiver or condenser.
If you cannot secure existing system charge, use your Recovery Unit
to save and store the refrigerant charge.
Do not release
refrigerant into the atmosphere. You will be liable for heavy fines
if you do!
- Before installing
the APR Control make sure your system is clean. If not, or in doubt,
a filter strainer must be used to protect the APR Control and isolate
and remove the system contaminants. (Particles of dirt can settle on
the valve seat of the hot gas bypass valve and prevent it from closing,
possibly causing compressor overheating and subsequent system damage.)
- After you install
the APR Control, use standard evacuation procedures and follow the directions
listed below. All connections between the system and the APR Control
are made in the condensing section. The APR Control may be placed outside
the unit housing. The APR Control may be mounted vertical or horizontally.
Note - If
you choose to mount the APR Control vertically - the mixed gas discharge
from the top of the desuperheating chamber must be UP! Using line valves
to isolate the APR Control inlet liquid, hot gas and external equalizer
connections, and outlet mixed gas discharge line, is recommended but
optional, and not functionally required.
- All soldering
connections to the APR Control should be made with Type 400 6% Silver
(205 deg. C) Solder only. Do not hard solder or silver solder APR Control
connections to your system. Exceptions can be made where vibration or
pulsation is present or where Government specifications call for hard
solder or braising.
- To eliminate damage
to the APR Control Valves, use plenty of wet rags or Heat Absorbing
Paste on the valves prior to starting, and aim your flame away from
the valve bodies.
- Tee in a line
shut-off valve at the compressor hot gas discharge line -- size valve
to the APR Control hot gas inlet valve inlet -- where a strainer is
supplied, install it in the 5/8î or 7/8î hot gas valve inlet
only.
- Tee in a line
shutoff valve at the compressor suction line — size it to the APR
Control mixed gas discharge (TOP) outlet, either 5/8î or 7/8î
ODF.
- Tee in line shutoff
valve at the liquid line near the condenser coil or receiver outlet.
Size this valve to the 3/8î ODF APR Control thermal expansion
valve inlet.
- If your system
uses PUMPDOWN or PUMPOUT control, line valve M, the mixed gas line valve
must be replaced by a solenoid valve with manual stem for shut off.
The coil voltage should be your unit control voltage.
- Mount the APR
Control securely within the condensing unit.
- Connect hot gas
from the line valve to the APR Control hot gas bypass valve inlet G
- Connect suction
from the line valve to the APR Control mixed gas outlet M
- Connect 3/8 liquid
from the line valve to the APR Control thermal expansion valve inlet
L
- External Equalizers
must be coupled for one suction line connection only.
- Thermal expansion
valve bulb must be the last APR Control connection and nearest the compressor.
- Leak test system
and evacuate. Before charging system close all APR Control line valves,
do not leave
- APR Control open
when charging the system. No additional charge is necessary for the
APR Control to operate.
- APR Control is
set at the factory for R-22 /High Temperature application.
- Thermal Expansion
Valve at 57 deg. F (17 deg. superheat)
- Hot Gas Bypass
Valve at 58 psi pressure.
- Most APR Controls
are field adjustable when necessary.
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©2002
Rawal Devices. All rights reserved.
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