58
RT-SVX24Q-EN
measure and record the preliminary amount of R-
410A added to each circuit.
12. With all the circuit compressors operating, SLOWLY
meter R410-A into the suction line from the LIQUID
charging connection.
Evaporative Condenser Tubing Connection
IImmppoorrttaanntt::
• For units with electric heat, complete
tubing connections AFTER completing
wiring connections. See “Electric Heat
Wiring Connection,” p. 59.
• Complete tubing connections BEFORE
Power and Control wiring connections.
See “Power and Control Wiring
Connections,” p. 59.
There will be a N
2
nitrogen charge in the air handler
section. This holding charge should be relieved prior to
removing the caps.
The condenser section will ship with R-410A
throughout the entire tubing assemblies. The service
valves will be shipped in an open position. Additional
interconnecting tubes (approx. 15-20" in length) will be
supplied with the unit.
1. To prepare the condensing section for the joining of
the two sections, the discharge line service valves
should be shut and the refrigerant remaining
between the valves and the end caps should be
transferred/recovered.
2. If the unit has been purchased with hot gas bypass
or hot gas reheat options, those valves should be
shut as well and the refrigerant transferred/
recovered from the sections between the valves
and the end caps.
3. Remove the brackets which support the suction
tubes (retain for possible use later for unit
reassembly) after the tubing connections are
complete.
4. Relieve the pressure (charge) for the section of the
tubing being worked on.
5. Place wet rags on the flow/ ball valve on the high
side when suction tubes are being brazed.
NNoottee:: Additional care should be taken when
brazing near the wire bundle.
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6. Sweat the copper caps off both the high and low
side of the suction and liquid lines of both circuits.
7. Clean the joints of weld puddles to avoid insertion
problems.
8. Cut the appropriate interconnecting tube to a length
approximately 0.75"- 1" more than the distance
between the two tubes.
9. Insert the appropriate tube to the complete depth of
the bell on one side of the joint and align the other
side (prying the high side may be needed). Make
sure the insertion depth is met.
10. Complete the connections by brazing the tubes in
place.
NNoottee:: Refrigeration ball valves are intended for
general service and are not a positive shutoff
device.
11. Once all connections have been brazed, evacuate
the low side. The low side may be evacuated by the
schrader ports on the discharge line just past the
compressor and the liquid line below the sight
glass. See Figure 40, p. 57.
The recommended method for evacuation and
dehydration is to evacuate the low side to 500
microns or less. To establish that the unit is leak-
free, use a standing vacuum test. The maximum
allowable rise over a 15 minute period is 200
microns. If the rise exceeds this, there is either still
moisture in the system or a leak is present.
NNoottee:: Only after evacuation should the tagged
valves be opened.
IInnssttaallllaattiioonn
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