Lennox Merit 14HPX-018 User manual

,1_2008 Lennox Industries Inc,
Dallas, Texas, USA
INSTALLATION
INSTRUCTIONS
14HPX Series Units
HEAT PUMP UNITS _Technical
505,243M LLJJ Publications
04108 Litho U.S.A.
Supersedes 03/08
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNING
CAUTION
14HPX Outdoor Unit ........................... 1
Shipping and Packing List ...................... 1
Unit Dimensions ............................... 2
General Information ........................... 3
Setting the Unit ............................... 3
Electrical ..................................... 4
Refrigerant Piping ............................. 5
Flushing Existing Line Set and Indoor Coil ........ 8
Refrigerant Metering Device .................... 9
Manifold Gauge Set ........................... 10
Service Valves ................................ 10
Leak Testing .................................. 11
Evacuation ................................... 11
Start-Up ...................................... 12
Refrigerant Charge ............................ 12
Checking Indoor Airflow ....................... 12
Setup for Checking and Adding Charge .......... 13
System Operation ............................. 17
Defrost System ............................... 17
Maintenance .................................. 22
Optional Accessories .......................... 23
Homeowner Information ........................ 23
Thermostat Operation .......................... 24
14HPX Check List ............................. 24
IMPORTANT
IMPORTANT
14HPX Merit ® outdoor units use HFC-410A refrigerant.
This unit must be installed with a matching indoor blower
coil and line set as outlined in the Lennox Engineering
Handbook. 14HPX outdoor units are designed for use in
expansion valve systems only. They are not designed to be
used with other refrigerant flow control devices. An expan-
sion valve approved for use with HFC-410A must be or-
dered separately and must be installed prior to operating
the unit.
1-Assembled 14HPX outdoor unit
Check the unit components for shipping damage. If you
find any damage, immediately contact the last carrier.
04/08
[[IHHI[III[IIIHIlII[IIIII[[IH[III Page 1 505,243M [III[I[[IIII[I[[I[I[IIIIIII[IIHI[[III

INLET AIR
,_ INLET AIR
©
INLET AIR
iT_
4-3/8
(111)
T
OPTIONAL UNIT STAND-OFF KIT
(4) (FIELD-INSTALLED)
COIL DRAIN OUTLETS ir
(AROUND PERIMETER OF
BASE)
5-3/8
VAPOR LINE CONNECTION (152)
INLET AIR,,_i_ LIQUID LINE CONNECTION "_
TOP VIEW TOP VIEW BASE SECTION
A _--J
,91--- A_' OUTDOOR COIL FAN tD SCHARGE A R
4-3/8
(111)
4-3/8
(111)
COMPRESSOR
VAPOR AND LIQUID
LINE CONNECTIONS
2-3/4 (70)
OPTIONAL UNIT
STAND-OFF KIT (4)
(FIELDqNSTALLED)
m
SIDE VIEW 3/4(19) _i SIDE VIEW
Model No. ABC
14HPX-018 24-1/4 (616) 29-1/4 (743) 28-1/2 (724)
14HPX-024 24-1/4 (616) 29-1/4 (743) 28-1/2 (724)
14HPX-030 24-1/4 (616) 33-1/4 (845) 32-1/2 (826)
14HPX-036 32-1/4 (819) 29-1/4 (743) 28-1/2 (724)
14HPX-042 32-1/4 (819) 37-1/4 (946) 36-1/2 (927)
14HPX-048 32-1/4 (819) 37-1/4 (946) 36-1/2 (927)
14HPX-060 32-1/4 (819) 43-1/4 (1099) 42-1/4 (1073)
505243 04/08
Page 2

WhenservicingorrepairingHVACcomponents,ensure
capsandfastenersareappropriatelytightened.Table1
liststorquevaluesfortypicalservice/repairitems,
Table1.TorqueRequirements
Part Recommended Torque
Liquid service valve cap 85 in.-lb. 10 NM
Suction service valve cap 85 in.-lb. 10 NM
Sheet metalscrews 16 in.-lb. 2 NM
Machine screws #8 28 in.-lb. 3 NM
Compressor bolts 90 in.-lb. 10 NM
Gauge port seal cap 62 in.-lb. 7 NM
These instructions are intended as a general guide and do
not supersede national or local codes in any way. Consult
authorities having jurisdiction before installation,
WARNING
CAUTION
1, Place a sound-absorbing material, such as Isomode,
under the unit if it will be installed in a location or posi-
tion that will transmit sound or vibration to the living
area or adjacent buildings+
2, Mount unit high enough above ground or roof to allow
adequate drainage of defrost water and prevent ice
build-up,
3. In heavy snow areas, do not locate unit where drifting
will occur, The unit base should be elevated above the
depth of average snows.
NOTE -Elevation of the unit may be accomplished by
constructing a frame using suitable materials. If a sup-
port frame is constructed, it must not block drain holes
in unit base.
4. When installed in areas where low ambient tempera-
tures exist, locate unit so winter prevailing winds do
not blow directly into outdoor coil.
5. Locate unit away from overhanging roof lines which
would allow water or ice to drop on, or in front of, coil
or into unit.
(AS NOTED)
*A service clearance of 30" (702 mm) must be maintained on one
of the sides adjacent to the control box+Clearance to one of the
other three sides must be 36" (914 mm), Clearance to one of the
remaining two sides may be 12" (305 mm) and the final side may
be 6" (152 mm).
A clearance of 24" (610 mm) must be maintained between two
units. 48" (1219 mm) clearance required on top of unit+ Maximum
soffit overhang is 36" (914 mm).
Figure 1. Installation Clearances
SLAB MOUNTING
When installing the unit at grade level, the top of the slab
should be high enough above the grade so that water from
higher ground will not collect around the unit. See figure 2.
The slab should have a slope tolerance away from the
building of 2 degrees or 2 inches per 5 feet (51 mm per
1524 mm). This will prevent ice build-up under the unit dur-
ing a defrost cycle. Refer to roof mounting section for barri-
er construction if the unit must face prevailing winter winds,
Unit is shown with optional stand-offs (Cat# 94J35),
DISCHARGE AIR
STRUCTURE 0
OPTIONAL
STAND-OFFS
(CAT#94J35)
MOUNTING SLAB MUST SLOPE GROUND
AWAY FROM BUILDING. LEVEL
Figure 2. Slab Mounting At Ground Level
Page 3
14HPX SERIES

ROOF MOUNTING
Install unit a minimum of 6 inches (152 mm) above the roof
surface to avoid ice build-up around the unit Locate the
unit above a load bearing wall or area of the roof that can
adequately support the unit Consult local codes for roof-
top applications
PREVAILING WINTER WINDS
©
I WINDBARRIER I
INLET AIR
0
INLET AIR
0
0
INLET AIR
INLET AIR
0
Figure 3. Rooftop Application Wind Barrier
If unit coil cannot be mounted away from prevailing winter
winds, construct a wind barrier Size barrier at least the
same height and width as the outdoor unit Mount barrier
24 inches (610 mm) from the sides of the unit in the direc-
tion of prevailing winds
In the USA. wiring must conform with current local codes
and the current National Electric Code (NEC) In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC)
WARNING I
Refer to the furnace or blower coil installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size
1 Install line voltage power supply to unit from a properly
sized disconnect switch (see figure 6)
2 Ground unit at unit disconnect switch or to an earth
ground (see figure 6)
,
,
NOTE -Tofacilitate conduit, a hole is in the bottom of
the control box. Connect conduit to the control box
using a proper conduit fitting.
NOTE -Units are approved for use only with copper
conductors. 24V, Class II circuit connections are
made in the low voltage junction box. Refer to figure 6
for field wiring diagram.
NOTE -A complete unit wiring diagram is located in-
side the unit control box cover.
NOTE -For proper voltages, select thermostat wire
gauge per the following chart:
Wire run length AWG # Insulation type
less than 100' (30m) 18 color-coded, temperature
more than 100' (30m) 16 rating 35°C minimum
Install room thermostat (ordered separately) on an in-
side wall approximately in the center of the conditioned
area and 5 feet (1.5 m) from the floor. It should not be
installed on an outside wall or where it can be effected
by sunlight, drafts or vibrations.
Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit (see figures 4 & 5).
NOTE -24V, Class II circuit connections are made in
the low voltage junction box.
Thermostat Outdoor Unit
®1 ®
power
common
1st, stage aux heat
indoor blower
reversing valve
Indoor Unit
q_(_ power
_(__ common
iI_ 1st. stage aux. heat
4-@- ,
4®
compressor
(SOME CONNECTIONS MAY NOT APPLY. REFER
TO SPECIFIC THERMOSTAT AND INDOOR UNIT.)
Figure 4. Outdoor Unit/Blower Unit Field Wiring
Indoor UnitThermostat
(R) -- -po-weL - - -_
oommonj
k.C/
(_ emergency h%at __
I
I
@
®
®
@
- _sLst_e Su£_FI l-
k
indoor btower
reversing valve
compressor
(SOME CONNECTIONS MAY NOT APPLY. REFER TO
SPECIFIC THERMOSTAT AND INDOOR UNIT.)
Outdoor Unit
,_ power (_1
oommon@1
emer
heay_"_/_e_
@1
-®1 ®1
@1
Figure 5. Outdoor Unit/Blower Unit Field Wiring
(with outdoor thermostat and emergency heat relay)
505243 04/08
Page 4

Z_ NOTE-
FOR USE WITH COPPER CONDUCTORS
ONLY.REFER TO UNIT RATIN6
PLATE FOR MINIMUM CIRCUIT
ANPACITY AND MAXIMUM OVER-
CURRENT PROTECTION SIZE
Z_ REFER TO COMPRESSOR IN UNIT
FOR ACTUAL TERMINAL ARRANGEMENT.
/_ WARNING-
ELECTRIC SHOCK HAZARD,CAN CAUSE INJURY
OR DEATH.UNIT MUST BE GREED IN
ACCO_OANCE WITH NATIONAL AND LOCAL CODES.
RTI4 SENSOR, OUTDOOR TEMP (OPTIONAL)
£,87 LOV! LI
PRESSURE REVERSIND
SWITCH VALVE
C_WPBESSO_
CORTACTOR
EQUIPMENT
6ROUND
COMPRESSOR
CONTACTOR
L2_ )--C)
S,€
HI6H
PRESSURE
SWITCH
Q
RTI5
AMBIENT
SENSOR
0
RT2 I
DEFROST
COIL
SENSOR
@
CI2
CAPACITOR
O OUT
AI_
DEFROST CONTROL ;OIL
_MB
)IS
OUT
OPS
2 OUT
KI
COMPRESSOR
CONTACTOR
c
c
c
c
c
c
C
CBSIMV
-'_91_- I-----
--0-1---- --
-
SIGNATURE
81M2B
TWlSTEO
RTI4
m'
GROUNDz_
208-
mL2 230/
60/_
L}
_GENDTES OPTIONAL COMPONENTS
_LINE VOLTAGE FIELD INSTALLED
-- -- --CLASS II VOLTAGE FIELD INSTALLED
Figure 6. Typical Field Wiring Diagram
Table 2. Refrigerant Line Sets
If the 14HPX unit is being installed with a new indoor coil
and line set, plumbing connections should be made as out-
lined in this section. If an existing line set and/or indoor coil
is going to be used to complete the 14HPX system, refer to
the following section that includes flushing procedures.
Field refrigerant piping consists of liquid and vapor lines
from the outdoor unit (sweat connections) to the indoor coil
(flare or sweat connections).
Use Lennox L15 (sweat, non-flare) series line sets as
shown in table 2 or use field4abricated refrigerant lines.
Refer to Refrigerant Piping Guide (Corp. 9351-L9) for
proper size, type, and application of field4abricated lines.
Valve sizes are also listed in table 2.
PLUMBING CONNECTIONS--14HPX MATCHED
WITH NEW INDOOR COIL AND LINE SET
If replacing an existing coil that is equipped with a liquid line
functioning as a metering orifice, replace the liquid line
prior to installing the 14HPX unit. See table 2.
Field
Mod- Connections
el Liquid Vapor
Line Line
-018 3/8in. 3/4in
-024 (10 mm) (19 mm)
-030
-036 3/8 in. 7/8 in
-042 (10 ram) (22 ram)
-048
-060 3/8 in. 1-1/8 in,
(10 mm) (29 mm)
Recommended Line Set
Liquid Vapor L15
Line Line Line Sets
3/8 in. 3/4 in L15-41
(10mm) (19mm) 15 ft. - 50 ft.
(4.6 m - 15 m)
3/8 in, 7/8 in L15-65
(10mm) (22mm) 15 ft, - 50 ft.
(4.6 m- 15 m)
3/8 in. 1-1/8 in, Field
(10 mm) (29 mm) Fabricated
NOTE -Units are designed for line sets of up to fifty feet (15
m); for longer lengths, consult the Lennox Refrigerant Pip-
ing Guide (Corp. 9351-L9). Select line set diameters from
table 2to ensure that oil returns to the compressor.
Page 5
14HPX SERIES

INSTALLING REFRIGERANT LINE
Pay close attention to line set isolation during installation of
any heat pump or a/c system. When properly isolated from
building structures (walls, ceilings, floors), the refrigerant
lines will not create unnecessary vibration and subsequent
noises. Also, consider the following when placing and
installing a high-efficiency outdoor unit:
1, Placement--Some localities are adopting sound ordi-
nances based on the unit's noise level observed from
the adjacent property, not from the installation proper-
ty. Install the unit as far as possible from the property
line. When possible, do not install the unit directly out-
side a window, Glass has a very high level of sound
transmission. Figure 7 shows how to place the outdoor
unit and line set.
2, Line Set Isolation--The following illustrations dem-
onstrate procedures which ensure proper refrigerant
line set isolation, Figure 8 shows how to install line sets
on vertical runs. Figure 9 shows how to make a transi-
tion from horizontal to vertical. Figure 10 shows how
to install line sets on horizontal runs,
Install unit away
from windows.
Two 90° elb_
installed in line set will
• reduce line set vibration.
Figure 7. Unit Placement and Installation
NOTE -Similar instaflation practices should be used it line set Is to be Installed on exterior ot outside wall.
OUTSIDE WALL IMPORTANT - Refrigerant
lines must not contact wall. VAPOR LINE LI UID LINE
IMPORTANT!
Refrigerant
lines must
not contact
structure,
VAPOR LINE WRAPPED
WITH ARMAFLEX LIt?NIED
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii_!
CAULK
PVC PIPE FIBERGLASS
INSULATION
WIRE TIE
s INSlDEWALL
STRAP
SLEEVE
WIRE TIE
WOOD BLOCK
WIRE TIE
STRAP
SLEEVE
Figure 8. Refrigerant Line Sets: Installing Vertical Runs (new construction shown
505243 04/08
Page 6

ANCHORED
HEAVY NYLON
WIRE TIE
AUTOMOTIVE
MUFFLER-TYPE
HANGER
WALL
STUD WALL
STUD
Strap Liquid
Line To Va- Strap Liquid Line
por Line To Vapor Line
)UID LINE LIQUID LINE
METAL VAPOR LINE - WRAPPED METAL VAPOR LINE - WRAPPED
SLEEVE IN ARMAFLEX SLEEVE IN ARMAFLEX
Figure 9. Refrigerant Line Sets: Transition From Vertical To Horizontal
To hang line set from joist or rafter,
use either metal strapping material
or anchored heavy nylon wire ties. 8 feet
WIRE TIE
(Around vapor line only)
STRAPPING MATERIAL
(Around vapor line only)
feet
METAL FLOOR JOIST OR
SLEEVE ROOF RAFTER
TAPE OR WIRE TIE H
\TAPE OR WIRE TIE
Strap the vapor line to the joist or
rafter at 8 ft, intervals then strap
the liquid line to the vapor line.
Figure 10. Refrigerant Line Sets: Installing Horizontal Runs
WARNING
BRAZING CONNECTION PROCEDURE
1. Cut ends of the refrigerant lines square (free from
nicks or dents). Debur the ends. The pipe must remain
round, do not pinch end of the line.
2. Flow dry nitrogen through the refrigerant piping while
making line set connections; this prevents carbon de-
posits (oxidation) buildup on the inside of the joints be-
ing brazed. Such buildup may restrict refrigerant flow
through screens and metering devices. To do this:
.
.
• Flow_ulated nitrogen (at 1 to 2 psig) through the
refrigeration gauge set into the Schrader port con-
nection on the vapor service valve and out of the
Schrader port connection on the liquid service
valve. (Metering device [TXV and RFC] will allow
low pressure nitrogen to flow through the system.)
• While nitrogen is flowing, braze refrigerant line set
to the indoor and outdoor units. IMPORTANT: The
flow of nitrogen must have an escape path
other than through the joint to be brazed.
Use silver alloy brazing rods (5 or 6 percent minimum
silver alloy for copper-to-copper brazing or 45 percent
silver alloy for copper-to-brass or copper-to-steel
brazing) which are rated for use with HFC-410A refrig-
erant.
Wrap a wet cloth around the valve body and copper
tube stub to protect it from heat damage during braz-
ing. Wrap another wet cloth underneath the valve body
to protect the base paint.
Page 7
14HPX SERIES

NOTE -The tube end must stay bottomed in the fitting
during final assembly to ensure proper seating, seal-
ing and rigidity.
5, Install a field-provided thermal expansion valve (ap-
proved for use with HFC-410A refrigerant) in the liquid
line at the indoor coil,
,A WARNING I
IMPORTANT
• Connect to the existing unit, a clean recovery cyl-
inder and the recovery machine according to the
instructions provided with the recovery machine.
• Remove all HCFC-22 refrigerant from the existing
system. Check gauges after shutdown to confirm
that the entire system is completely void of refrig-
erant.
• Disconnect the liquid and vapor lines from the ex-
isting outdoor unit.
If the existing outdoor unit is equipped with
manual shut-off valves AND you plan to use NEW
HCFC-22 refrigerant to flush the system -
• Start the existing HCFC-22 system in the cooling
mode and close the liquid line valve.
• Pump all of the existing HCFC-22 refrigerant back
into the outdoor unit. (it may be necessary to by-
pass the low pressure switches to ensure com-
plete refrigerant evacuation,)
• When the low side system pressures reach 0 psig,
close the vapor line valve.
• Disconnect all power to the existing outdoor unit.
Check gauges after shutdown to confirm that the
valves are not allowing refrigerant to flow back into
the low side of the system,
• Disconnect the liquid and vapor lines from the ex-
isting outdoor unit.
2, Remove the existing outdoor unit. Set the new
HFC-410A unit and follow the brazing connection pro-
cedure (see page 7) to make line set connections.
DO NOT install metering device at this time.
3, Make low voltage and line voltage connections to the
new outdoor unit. DO NOT turn on power to the unit
or open outdoor unit service valves at this time.
IMPORTANT
CAUTION
REQUIRED EQUIPMENT
You will need the following equipment in order to flush the
existing line set and indoor coil: two clean HCFC-22 recov-
ery bottles, an oilless recovery machine with a pump down
feature, and two sets of gauges (one for use with HCFC-22
and one for use with the HFC-410A),
FLUSHING PROCEDURE
1, Remove existing HCFC-22 refrigerant using the ap-
propriate procedure below,
If the existing outdoor unit is not equipped with
shut-off valves, or if the unit is not operational
AND you plan to use the existing HCFC-22 refrig-
erant to flush the system -
• Disconnect all power to the existing outdoor unit,
505243 04/08
Page 8
4, Remove the existing refrigerant flow control orifice or
thermal expansion/check valve before continuing with
flushing procedures. The existing devices are not ap-
proved for use with HFC-410A refrigerant and may
prevent proper flushing, Use a field-provided fitting to
reconnect the lines.
5, Remove the pressure tap valve cores from the 14HPX
unit's service valves. Connect an HCFC-22 cylinder
with clean refrigerant to the vapor service valve. Con-
nect the HCFC-22 gauge set to the liquid line valve and
connect a recovery machine with an empty recovery
tank to the gauge set.
6, Set the recovery machine for liquid recovery and start
the recovery machine, Open the gauge set valves to
allow the recovery machine to pull a vacuum on the ex-
isting system line set and indoor coil.
7, Invert the cylinder of clean HCFC-22 and open its
valve to allow liquid refrigerant to flow into the system
through the vapor line valve. Allow the refrigerant to
pass from the cylinder and through the line set and the
indoor coil before it enters the recovery machine,

Inverted HCFC-22 Cylinder
(Contains clean HCFC-22 to be
used for flushing)
RECOVERY CYLINDER
EXISTING VAPOR LINE VAPOR LINE
SERVICE VALVE
EXISTING LIQUID LINE LIQUID LINE
SERVICE VALVE
Tank ReturnInlet
, Discharge
RECOVERY MACHINE
Low High
Pressure Pressure
NOTE - The inverted HCFC-22 cylinder must
contain at least the same amount of refrigerant
as was recovered from the existing system.
Figure 11. Flushing Connections
8. After all of the liquid refrigerant has been recovered,
switch the recovery machine to vapor recovery so that
all of the HCFC-22 vapor is recovered,
NOTE -A single system flush should remove all of the
mineral oil from the existing refrigerant lines and in-
door coil, A second flushing may be done (using clean
refrigerant) if insufficient amounts of mineral oil were
removed during the first flush, Each time the system
is flushed, you must allow the recovery machine
to pull a vacuum on the system at the end of the
procedure.
9. Close the valve on the inverted HCFC-22 drum and
the gauge set valves. Pump the remaining refrigerant
out of the recovery machine and turn the machine off,
10. Use dry nitrogen to break the vacuum on the refriger-
ant lines and indoor coil before removing the recovery
machine, gauges and HCFC-22 refrigerant drum. Re-
install pressure tap valve cores into 14HPX service
valves.
11. Install the provided check/expansion valve (approved
for use with HFC-410A refrigerant) in the liquid line at
the indoor coil.
14HPX units are used in check expansion valve (CTXV)
systems only. See the Lennox Engineering Handbook for
approved valve match-ups and application information,
NOTE -HFC-410A systems will not operate properly with
an HCFC-22 valve.
Check expansion valves equipped with Chatlefffittingsare
available from Lennox. Refer to the Engineering Hand-
book for applicable check expansion valves for use with
specific match-ups, See table 3 for applicable check ex-
pansion valve kits,
Table 3. Indoor Check Expansion Valve Kits
MODEL Kit Number
14HPX-018, -024, -030 49L24
14HPX-036, -042 49L25
14HPX-048, -060 91M02
Page 9
14HPX SERIES

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 d0 - 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) toback 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]OPENTO ;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