Evacuation; Field Wiring - Howe 1000-RLE Installation & Service Manual

Evacuation

Do not use the refrigeration compressor to
evacuate the system. Do not start the
compressor while it is in a vacuum.
A good, deep vacuum pump should be
connected to both the low and high side
evacuation valves with copper tube or high
vacuum hoses (1/4" ID minimum).
If the compressor has service valves, they
should remain closed.
A deep vacuum gauge capable of registering
pressure in microns should be attached to the
system for pressure readings.
A shut off valve between the gauge connection
and vacuum pump should be provided to allow
the system pressure to be checked after
evacuation.
Do not turn off vacuum pump when connected
to an evacuated system before closing shut off
valve.
The vacuum pump should be operated until a
pressure of 1,500 microns absolute pressure is
reached – at which time the vacuum should be
broken with the refrigerant to be used in the
system through a drier until the system
pressure rises above "0" psig.
Refrigerant used during evacuation cannot be
vented. Reclaim all used refrigerant.
Repeat this operation a second time.
Open the compressor service valves and
evacuate the entire system to 500 microns
absolute pressure. Raise the pressure to 2 psig
with the refrigerant and remove the vacuum
pump.
Field Wiring
All field wiring must be in compliance with local
and national codes. Use only copper
conductors of the appropriate size.
10
1. Install disconnect (not supplied by
factory).
2. Connect 208‐230/1/60 power to the
two black wires marked "L1" and "L2"
in the junction box on the rear of the
Ice Flaker.
3. In the junction box there are two red
wires marked "A" and "B". Remove
wire nut.
4. Connect the normally‐open isolating
contacts from the relay mounted in the
condensing unit to "A" and "B".
5. Locate and connect Photo Eye sensors
to the matching plug inside the Ice
Flaker enclosure (see p.24).