Lennox HS29-012, Информация об устройстве

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Page 9
B − Service Valves
The liquid and suction line service valves (figures 8 and 9) and
gauge ports are accessible from outside the unit.
The valve is equipped with a service port. The service ports are
used for leak testing, evacuating, charging and checking
charge. A schrader valve is factory installed. A service port cap
is supplied to protect the schrader valve from contamination
and serve as the primary leak seal.
NOTE-Always keep valve stem caps clean.
To Access Schrader Port:
1 − Remove service port cap with an adjustable wrench.
2 − Connect gauge to the service port.
3 − When testing is completed, replace service port cap. Tight-
en finger tight, then an additional 1/6 turn.
To Open Liquid or Suction Line Service Valve:
1 − Remove stem cap with an adjustable wrench.
2 − Using service wrench and hex head extension (3/16" for
liquid line and 5/16" for suction line) back the stem out
counterclockwise until the valve stem just touches the re-
taining ring. For 5 ton unit with ball type suction line valve,
use adjustable wrench and back stem out counterclock-
wise 1/4 turn.
3 − Replace stem cap tighten firmly. Tighten finger tight, then
tighten an additional 1/6 turn.
Do not attempt to backseat the service valves
past the retaining ring. Attempts to backseat
the service valves past the retaining ring will
cause snap ring to explode from valve body
under pressure of refrigerant. Personal injury
and unit damage will result.
DANGER
To Close Liquid or Suction Line Service Valve:
1 − Remove stem cap with an adjustable wrench.
2 − Using service wrench and hex head extension (3/16" for liq-
uid line and 5/16" for suction line), turn stem clockwise to
seat the valve. Tighten firmly. For 5 ton unit with ball type
suction line valve, use adjustable wrench and turn stem
clockwise 1/4 turn.
3 − Replace stem cap. Tighten finger tight, then tighten an
additional 1/6 turn.
Suction Line (Ball Type) Service Valve
(5 Ton Only)
A ball-type full service valve is used on HS29 5 ton units.
These suction line service valves function the same way,
differences are in construction. Valves are not rebuildable.
If a valve has failed it must be replaced. A ball valve is illustrated
in figure 10.
The ball valve is equipped with a service port. A schrader
valve is factory installed. A service port cap is supplied to
protect the schrader valve from contamination and as-
sure a leak free seal.