H
IGH
V
OLTAGE
C
ONNECTIONS
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.
L
OW
V
OLTAGE
C
ONNECTIONS
For low voltage connections refer to the Indoor Unit
Installation Manual.
SYSTEM START
UP
WARNING
WARNING
REFRIGERANT UNDER PRESSURE!
• D
O
NOT
OVERCHARGE
SYSTEM
WITH
REFRIGERANT
.
• D
O
NOT
OPERATE
UNIT
IN
A
VACUUM
OR
AT
NEGATIVE
PRESSURE
.
F
AILURE
TO
FOLLOW
PROPER
PROCEDURES
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.
CAUTION
CAUTION
POSSIBLE REFRIGERANT LEAK
T
O
AVOID
A
POSSIBLE
REFRIGERANT
LEAK
,
OPEN
THE
SERVICE
VALVES
UNTIL
THE
TOP
OF
THE
STEM
IS
1/8”
FROM
THE
RETAINER
.
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 turning the
hex wrench counterclockwise. Open the valve until it
contacts 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. 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.
1. 3/8” valve to 5 - 10 in-lbs
2. 5/8” valve to 5 - 20 in-lbs
3. 3/4” valve to 5 - 20 in-lbs
4. 7/8” valve to 5 - 20 in-lbs
Do not introduce liquid refrigerant from the cylinder
into the crankcase of the compressor as this may
damage the compressor.
CAUTION
CAUTION
POSSIBLE REFRIGERANT LEAK
To avoid a possible refrigerant leak, open the service
valves until the top of the stem is
1/8"
from the retainer.
1. Break vacuum by fully opening liquid and suction
base valves.
2. Set thermostat to call for cooling. Check indoor and
outdoor fan operation and allow system to stabilize for
10 minutes for fixed orifices and 20 minutes for
expansion valves.
CAUTION
CAUTION
T
HE
CORRECT
REFRIGERANT
CRITICAL
CHARGE
IS
NEEDED
FOR
PROPER
OPERATION
WARNING
WARNING
U
SE
REFRIGERANT
CERTIFIED
TO
AHRI
STANDARDS
.
U
SE
OF
USED
REFRIGERANT
MAY
CAUSE
COMPRESSOR
DAMAGE
THAT
IS
NOT
COVERED
UNDER
WARRANTY
. M
OST
PORTABLE
MACHINES
CANNOT
CLEAN
USED
REFRIGERANT
TO
MEET
AHRI
STANDARDS
..
CAUTION
CAUTION
O
PERATING
THE
COMPRESSOR
WITH
THE
SUCTION
VALVE
CLOSED
MAY
CAUSE
SERIOUS
COMPRESSOR
DAMAGE
.
Copyright © 2019 DewAir Corporation
10
RHC18O-IM v2.11 Sep 4, 2019
