Lennox XP14 Elite Series Installation Instructions Manual page 13

CHECK
EXPANSION VAL_
LOW HUGH
PRESSURE PRESSURE
DISTRIBUTOR
BIFLOW
FILTE
DRIER OUTDOOR
COIL
COMPRESSOR
v
OUTDOOR UNiT
REVERSING VALVE
VAPOR
/APOR
SERVICE .INE
POR_ /ALVE
CHECK EXPANSION VALVE --
NOTE- Use gauge ports on vapor line valve and liquid valve for evacuating refrigerant
lines and indoor coil. Use vapor gauge port to measure vapor pressure during charging.
NOTE - ARROWS INDICATE
DIRECTION OF REFRIGERANT FLOW
INDOOR I
VAPOR
SERVICE
PORT
:ll--
ilhd I I
INDOOR
COIL
Figure 20. XP14 Cooling Cycle (Showing Gauge Manifold Connections)
Manifold gauge sets used with systems charged with
HFC-410A refrigerant must be capable of handling the
higher system operating pressures. The gauges should be
rated for use with pressures of 0 - 800 on the high side and
a low side of 30" vacuum to 250 psi with dampened speed
to 500 psi. Gauge hoses must be rated for use at up to 800
psi of pressure with a 4000 psi burst rating.
The service valves and gauge ports are used for leak
testing, evacuating, charging and checking charge. Each
valve is equipped with a service port which has a
factory-installed Schrader valve. A service port cap
protects the Schrader valve from contamination and
serves as the primary leak seal.
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.
Tighten finger tight, then torque per table 1 on page 3.
To Open Front-Seated Service Valves:
1. Remove stem cap with an adjustable wrench.
2. Use a service wrench with a hex-head extension
(3/16" for liquid-line valve sizes; 5/16" for vapor-line
valve sizes) to back the stem out counterclockwise as
far as it will go.
3. Replace the stem cap. Tighten finger tight, then torque
per table 1 on page 3.
To Close Front-Seated Service Valves:
1. Remove the stem cap with an adjustable wrench.
2. Use a service wrench with a hex-head extension
(3/16" for liquidqine valve sizes; 5/16" for vapor-line
valve sizes) to turn the stem clockwise to seat the
valve. Tighten it firmly.
3. Replace the stem cap. Tighten finger tight, then torque
per table 1 on page 3.
STEM INSERT HEX
SCHRADER CAP
VALVE ]OPEN TO
LINE SET WHEN
VALVE IS CLOSED ",LLJ
]FRONT SEATED)] _
OUT-
DOOR
COl
SERVICE
PORT CAP
_VALVE FRONT-SEATED)
Valve in closed position
WRENCH HERE,
/
Valve in open position
Figure 21. Front-Seated Liquid Line Valve
Vapor Line Ball Valve
Ball-type service valves as illustrated in figure 22 function
the same way as the other valves but cannot be rebuilt; if
one fails, replace with a new valve. The ball valve is
equipped with a service port with a factory-installed
Schrader valve. A service port cap protects the Schrader
valve from contamination and assures a leak-free seal.
STEM
CAP
USE ADJUSTABLE WRENC
TO OPEN: ROTATE STEM _STEM
COUNTER-CLOCKWISE 90 °.
TO CLOSE: ROTATE STEM
CLOCKWISE 90° .
TO
OUTDOOR
COIL
BALL (SHOWN
SERVICE PORT
(_SCHRADER VALVE
TO
INDOO
R COIL SERVICE
PORT CAP
Figure 22. Bali-Type Vapor Valve (Valve Closed)
Page 13
XP14 SERIES