Installation, Operation and Maintenance Manual
C13-Series
12
Subject to change without notice.
10.20-IM (0818)
INFORMATION
IMPORTANT! On units with more than one
refrigerant circuit, be careful not to inter-
mix liquid, suction and/or hot gas lines
of the various circuits� If the connections
were labeled before disconnecting the
couplings, this should not be a problem�
The 6 Ton and 8 Ton units have 2 circuits
(with 2 suction line couplings and 2 liquid
line couplings)�
CAUTION
When brazing tubing to the self- sealing
couplings, use a water-soaked wet rag,
running water bath or chill blocks on the
quick-connects to prevent overheating the
valves and damaging the seals� Always
apply heat toward the field installed
refrigerant line� Do not apply heat toward
the coupling valve and seal�
INFORMATION
NOTE: The interconnect tubing kit (Figure
6) contains a sufficient number of Schrader
access valves to permit installation of one
Schrader in each end of both the liquid
and suction lines of the field supplied
tubing� Each interconnecting line (suction,
liquid, or hot gas) must have at a minimum
one Schrader access fitting. However for
short lengths of tubing, only one Schrader
in each line is necessary�
4�
The suction line should be pitched downward to the
compressor, sloping approximately 1/4" every ten feet
to facilitate oil return�
5�
“P” traps (field supplied) are required for all suction
line risers every 15 feet� When the evaporator is above
the condensing section, an inverted “P” trap should be
incorporated as close as possible to the evaporator
(this minimizes floodback/oil slugging during the off
cycle)� If the condensing section is more than 40 feet
above the evaporator, consult the factory for specific
refrigeration components�
6�
Install the Schrader valve fittings into the tubing before
brazing the couplings onto the ends of the tubing� Use
a 1/4" hole to mount the valve. Clean and debur the
tubing before doing any brazing to ensure that no chips
or debris are left in the refrigerant circuit� Remove the
Schrader valve cap and core before doing any brazing�
7�
Leak check line sets with nitrogen at 500 psig� After
brazing the tubing to the self-sealing coupling halves,
evacuate each line to 300 microns� Check to make
sure that each line holds a vacuum after removal of the
vacuum pump (indicating no leaks) (micron level should
not go above 500 microns within 10 minutes)� Add the
appropriate charge of R- 410a Refrigerant using the
Schrader valves� Wipe off coupling seals and threaded
surfaces with a clean cloth to prevent the inclusion of
dirt or foreign material into the system (See Figure 5)�
Lubricate rubber seal (Item
(14)
) and metal seal (Item
(15)
) in the male halves (Item
(5)
) with refrigeration
oil� Thread coupling halves together by hand to insure
proper mating of threads� Continue to hand-thread
each half-coupling to its mating half until resistance is
felt (approximately 1-1/2 to 1-3/4 turns)� Complete the
connection of the mating half-couplings with a wrench�
The suction line couplings will be totally engaged
after an additional 5-1/2 to 5-3/4 turns� The liquid line
couplings will be totally engaged after an additional
4-1/2 to 4-3/4 turns�
8�
Refrigerant piping shall be insulated in accordance with
local codes and / or applicable ASHRAE Standards�
Insulation exposed to weather shall be suitable for
outdoor use� Provide protection from water and
shielding from solar radiation as necessary�
9�
Add R-410A refrigerant to the system to compensate
for the additional interconnecting tubing as follows:
a�
For 3/8" liquid line – add 0.6 oz. per foot
b�
For 1/2" liquid line – add 1.2 oz. per foot
c�
For 5/8" liquid line – add 1.8 oz. per foot
Содержание C13-Series
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