CHARGING AND LEAK TESTING
On systems with or without service valves the refrigerant
should be recovered or recycled in accordance with EPA
regulations. In some cases this may require putting piercing
valves on both the high and low sides of the system.
WARNING:
DO NOT vent refrigerant to the outdoors.
When recovering refrigerant from a system, with a burnout,
follow a safe procedure due to possible contamination.
CAUTION: Avoid getting the refrigerant in the eyes or on the
skin.
Contaminated refrigerant must be recovered and
returned to the local refrigeration supply house for
proper disposition.
TOTAL LINE LENGTH
Units should be installed only with approved system combina-
tion (indoor/outdoor) as specified in the Technical Guide.
For systems with total line length exceeding 50 feet, see
APPLICATION DATA, 690.01-AD1V(1291) and worksheet
690.01-AD1.1V(791) "General Piping Recommendations and
Refrigerant Line Length" for vapor and liquid line sizing, cali-
bration of liquid line pressure loss or gain, determination of
vapor line velocity, elevation limitations, orifice connections,
system charging, traps, etc.
Systems with liquid line pressure loss or gain greater than 11
psi must be provided with corrected orifice size as noted in
Form 690.01 - AD1V (1291).
ORIFICE SELECTION (ORIFICE TYPE COILS
ONLY)
NOTE: The proper orifice must be installed in the evaporator
coil liquid line connection prior to the connection of the
refrigerant lines.
WARNING: Coil is under 35 psig (inert gas) pressure,
Each coil has an orifice installed in the fitting between the liquid
line connection and distributor. The orifice is identified on a
label next to the liquid line connection.
The orifice shipped with the indoor coil is based on the “most
sold” combination. The indoor coil orifice may be changed,
depending on the capacity and efficiency of the outdoor unit,
elevation differences, and/or long total line lengths. An addi-
tional orifice(s) is shipped with most outdoor units for the most
commonly required replacement combinations. Other sizes
must be ordered from the Source 1 Parts Department if re-
quired.
See the appropriate Data Sheet for the correct orifice size. If
the orifice size matches, nothing further is required and the
refrigerant lines may be connected per the outdoor unit instruction.
However, if another orifice should be used, see the coil instruction
for details to change to change the orifice in the coil.
OPENING BASE VALVES
All models in this series have brass service valves. These
valves are not back seating. Opening or closing valve does not
close service port. Service ports have Schrader valves for
gauge connections. Use back-up wrench on valve body when
removing cap to open or close the valve. To open, insert hex
wrench into stem and back out counter clockwise until stem
just touches retaining ring.
CAUTION: If the valve stem is backed out beyond the retaining
ring, system pressure could force the stem out of
the valve body and possibly cause personal injury.
In the event that the retaining ring is missing do not
attempt to open the valve.
All caps must be replaced to prevent leaks.
Replace valve cap finger tight, then tighten an additional
1
⁄
6
of
a turn with a wrench, using a back-up wrench on the valve body.
OIL TRAPPING
When the outdoor unit is above the indoor coil oil trapping is
necessary. Please refer to APPLICATION DATA, 690.01-AD1V
(1291) and worksheet 690.01-AD1.1V (791) "General Piping
Recommendations and Refrigerant Line Length".
Check the system for correct charge after all components of
the system have been installed, connected and wired correctly.
Connect service gauges to the suction and discharge service
ports.
Allow unit to operate until system pressures and temperatures
have stabilized, making sure that the pressure and tempera-
tures align with unit service data. If not, check system charge
and adjust if necessary.
ELECTRICAL WIRING
WARNING: To prevent electrical shock, open remote disconnect
so electrical supply to outdoor unit is shut off
contactor does not open both sides of the line volt
electrical circuit.
POWER SUPPLY
All wiring must comply with N.E.C. and local codes. See rating
plate and product data sheet for volts, frequency, phase,
maximum fuse size and minimum branch circuit ampacity.
Refer to the wiring diagram inside the unit control box cover
before connecting to power supply.
1.
The line voltage service wiring for the outdoor unit must
include a disconnect switch located with and in sight of the
outdoor unit.
L IQ UID
L IN E
T AP E
INSU LA TE D VA P O R L
INE
C O R R EC T
INC O R R EC T
SH EET METAL HAN G ER
FIGURE 2 - Vapor Line Insulating
550.46-N1YI
4
Unitary Products Group
