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Negative
Pressure
Drain Pan
Blower
Running
Proper operation of condensate trap under
normal operating conditions.
"A" height of water column equals
negative static pressure existing in system.
"C" dimension should at least equal two
times the maximum negative static pressure
that can occur in system.
Do not reduce the drain line size less than the
connection size on the drain pan. Condensate
should be piped to an open drain or to the outside.
All drains must pitch downward away from the unit
a minimum of 1/4" per foot of line to ensure proper
drainage.
I I m m p p o o r r t t a a n n t t : :
•
If cleanout Tee is used, stand pipe
must be sealed/capped.
•
If a vent Tee is used, it must be
downstream from the trap.
Vent
-This vent pipe MUST
terminate above the
dotted line
To Drain
Cleanout
(Plug)
Insulate the primary drain line to prevent sweating
where dew point temperatures may be met.
(Insulation is optional depending on climate and
application needs.)
5. R R e e f f r r i i g g e e r r a a n n t t P P i i p p i i n n g g
Pipe-work including piping material, pipe routing,
and installation shall include protection from
physical damage in operation and service, and be in
compliance with national and local codes and
standards. All field joints shall be accessible for
inspection prior to being covered or enclosed.
There is a holding charge of dry air in the indoor
coil that will be evacuated when the sealing plugs
are removed.
18-GF79D1-1A-EN
"C"
"A"
To Drain
Cleanout
(with Cap)
I I n n s s t t a a l l l l a a t t i i o o n n I I n n s s t t r r u u c c t t i i o o n n s s
To protect the TXV, remove the TXV bulb from the
tubing inside the unit before brazing the line set
connections. Painted areas of the unit must be
shielded during brazing to protect the finish.
After brazing, replace the TXV bulb and insulate it
using the provided adhesive-backed insulation.
N N o o t t e e : : For optimal performance, the TXV bulb can
be located and insulated on the vapor line
outside the unit. Pass the bulb and line
through an opening in the line set panel.
Place the bulb at the 10 or 2 o'clock position
on the line, relative to the floor.
SENSING BULB
Bulb position at
SUCTION LINE
2 o'clock or
10 o' clock
The two flammable refrigerant red warning tags on
the line set connections should be removed prior to
brazing and replaced once brazing is complete.
After completion of field piping for split systems,
the field pipework shall be pressure tested with
nitrogen and then vacuum tested prior to
refrigerant charging, according to the following
requirements:
P P r r e e s s s s u u r r e e t t e e s s t t : :
•
Using dry nitrogen, pressurize the field piping
and indoor coil to the lower of the maximum
operating pressures listed on the name plates of
the indoor and outdoor units (likely 600 psi).
•
The test pressure after removal of the pressure
source shall be maintained for at least one (1)
hour with no decrease of pressure indicated by
the test gauge, with the test gauge resolution
not exceeding 30 psi.
•
Check for leaks by using a soapy solution at
each field-made joint.
13
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