Lennox 14HPX-018 Installation Instructions Manual page 10

IMPORTANT
If you install a check expansion valve with an indoor coil
that includes a fixed orifice, remove the orifice before the
check expansion valve is installed. See figure 12 for instal-
lation of the check expansion valve,
(Uncased Coil Shown) _.
TWO PIECE |
PATCH PLATE |ORIFICE
(uncased coil ORIFICE IEXPANSI_N VALVE
only) HOUSING
I (see note)
TUBES _
ACCESS FITTING
(no valve core)
On smaller suction lines, bulb may be
mounted on top or side-mounled (prefer-
ably at 3 o'clock position).
On 5/8" and larger lines, mount bulb
approximately at the 4 or 8 o'clock posi-
tions; never mount on bottom of line.
9 _clock
NOTE - If necessary, remove
HCFC-22 flow control device
(fixed orifice/check expansion
valve) from existing line set before
installing HFC-410A approved ex-
pans on va ve and o-r rig,
Figure 12. Metering Device Installation
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 d 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 (liquid line - figure 13, vapor line - figure
14) 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 and
tighten finger tight; then tighten 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 tighten
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 liquid-line 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 tighten
per table 1 (on page 3),
Vapor Line Ball Valve
Ball-type service valves (see figure 14) 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 ser-
vice port cap protects the Schrader valve from contamina-
tion and assures a leak-free seal.
STEM INSERT HEX
SCHRADER CAP
VALVE ]OPEN TO ;NO °
LINE SET WHEN
VALVE IS CLOSED
(FRONT SEATED)]
OU%
DOOR
COIL
OR
SERVICE
PORT CAP
(VALVE FRONT-SEATED)
Valve in closed position Valve in open position
Figure 13. Front-Seated Liquid Line Valve
_ STEM
CAP TO
OUTDOOR
COIL
USE ADJUSTABLE WRENCH STEM
TO OPEN: ROTATE STEM ,_ Tk _-.._,_j2_-'_ \
COUNTER-CLOCKWISE 90 °. _
TO CLOSE: ROTATE STEM
CLOCKWISE 90 ° .
BALL (SHOWN
CLOSED)
' SERVICE PORT
SCHRADER VALVE
TO
INDOO
COIL SERVICE
PORT CAP
Figure 14. Bali-Type Vapor Valve (Valve Closed)
505243 04/08
Page 10