Unitary products group EF-10, Инструкция по установке

Страница: 14 / 24

035-18550-001-A-0902
14 Unitary Products Group
extended period of time, it should be cleaned
before being used.
The liquid line connections can now be brazed while
maintaining a minimum flow of dry nitrogen through the
piping.
NOTE:
A filter-drier is factory-mounted in the outdoor
unit for the heating cycle and in the indoor unit
for the cooling cycle.
Do NOT install another filter-drier in the field-
supplied liquid line because refrigerant will
flow in both directions on a heat pump system.
1. The matched air handlers are shipped with a small
R-22 charge and they should be checked for leaks
before installation. Drill a small hole through the
sealing cap or disc in both the liquid and suction
connection. If there is a pressure release, the
evaporator has no leaks and you can proceed with
installation. If the charge has been lost, the coils
should be leak tested and the necessary repairs
made.
2. Move the dry nitrogen supply from the access port
on the liquid line service valve of the outdoor unit to
the hole through the vapor disc on the indoor unit.
3. Unbraze the coil's liquid line disc while maintaining
a flow of dry nitrogen across the connection and
through the hole in the liquid line disc.
4. After the disc has been removed, burnish the exter-
nal surfaces and clean the internal surfaces as out-
lined above.
5. Move the dry nitrogen supply back to the access
port on the liquid line service valve.
6. Braze the liquid line to the liquid connection on the
indoor unit while maintaining a minimum flow of dry
nitrogen through the liquid line, the indoor coil and
the hole in the vapor disc.
7. Unbraze the disc on the vapor connection of the
indoor unit while maintaining the flow of dry nitro-
gen.
8. After the disc has been removed, burnish the exter-
nal surfaces and clean the internal surfaces as out-
lined above.
The vapor piping can now be brazed to the vapor con-
nection on the indoor unit while maintaining a minimum
flow of dry nitrogen.
Before brazing the vapor line to the outdoor unit, make
sure the refrigerant in the line has been recovered,
then remove the copper disc from its vapor connection
per the following procedure:
1. Make sure that the vapor line service valve on the
outdoor unit is front-seated and closed with its
valve stem in the maximum clockwise position.
2. Drill a small hole through the disc before unbrazing
it to permit a flow of dry nitrogen through the con-
nection while its being unbrazed.
3. Move the dry nitrogen supply to the access port on
the vapor line service valve of the outdoor unit.
4. Unbraze the disc on the vapor line connection of
the outdoor unit while maintaining a minimum flow
of dry nitrogen through the access port of the vapor
line service valve and the hole in the vapor disc.
5. After the disc has been removed, burnish the exter-
nal surfaces and clean the internal surfaces of the
vapor connection and the vapor piping.
The vapor line can now be brazed to the vapor connec-
tion on the outdoor unit while maintaining the flow of
dry nitrogen.
After the liquid and vapor lines have been installed, the
system should be evacuated and charged.