Lennox 13HPX User manual

,?_2008 Lennox industries Inc,
Dallas, Texas, USA
INSTALLATION
INSTRUCTIONS
Merit®Series13HPX Units
HEAT PUMP UNITS _Technical
505,325M LLJJ Publications
03/08 LithoU.S.A.
Supersedes 07/07
WARNING
A CAUTION
AIMPORTANT
IMPORTANT
13HPX Outdoor Unit ........................... 1
Shipping and Packing List ...................... 1
Unit Dimensions ............................... 2
General Information ........................... 2
Setting the Unit ............................... 3
Electrical ..................................... 4
Refrigerant Piping ............................. 6
Flushing Existing Line Set and Indoor Coil ........ 8
Refrigerant Metering Device .................... 10
Manifold Gauge Set ........................... 10
Service Valves ................................ 10
Leak Testing .................................. 11
Evacuation ................................... 11
Start-Up ...................................... 12
Refrigerant Charge ............................ 12
Checking Airflow .............................. 12
Setup for Checking and Adding Charge .......... 13
System Operation ............................. 17
Defrost System ............................... 17
Maintenance .................................. 18
Optional Accessories .......................... 19
Homeowner Information ........................ 19
Thermostat Operation .......................... 20
13HPX Check List ............................. 20
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
13HPX 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. 13HPX 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 13HPX outdoor unit
Check the unit components for shipping damage. If you
find any damage, immediately contact the last carrier.
03/08
IIIHIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII Page 1 505,325M IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

Inlet Air
,_lnletAir
©
InletAir
Vapor Line
Connection
Ai'_ru Liquid Line
Inlet Connection
Optional Unit Stand-
off Kit (4) (Field-
installed',
Coil Drain Outlets
(Around Perimeter
Of Base)
4-3/8
(111)
6-3/8
(182)
4-3/8
(111)
4-3/8
(111)
TOP VIEW TOP VIEW BASE SECTION
SIDE VIEW
Model No. A C
13HPX-018 24-1/4 (616) 32-1/2 (826)
13HPX-024 24-1/4 (616) 32-1/2 (826)
13HPX-030 24-1/4 (616) 28-1/2 (724)
13HPX-036 24-1/4 (616) 32-1/2 (826)
13HPX-042 28-1/4 (616) 32-1/2 (826)
13HPX-048 28-1/4 (718) 36-1/2 (927)
13HPX-060 28-1/4 (718) 42-1/4 (1073)
3/4 (19)
B
33-1/4 (845)
33-1/4 (845)
29-1/4 (743)
33-1/4 (845)
33-1/4 (845)
37-1/4 (946)
43-1/4 (1099)
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.
OutdoorCoil Fan \ tDischarge
Compressor_
Vapor & Liquid
Line Connections
L
2-3/4 (70)
Optional Unit
Stand-off Kit (4)
(Field-installed)
SIDE VIEW
When servicing or repairing HVAC components, ensure
caps and fasteners are appropriately tightened. Table 1
lists torque values for typical service/repair items.
Table 1. Torque Requirements
Part Recommended Torque
Liquid service valve cap 8 ft.- lb. 11 NM
Suction service valve cap 11 ft.- lb. 15 NM
Sheet metal screws 16 in.- lb. 2 NM
Machine screws #8 28 in.- lb. 3 NM
Compressor bolts 90 in.- lb. 10 NM
Gauge port seal cap 85ft.- lb. 7 NM
505325 03/08
Page 2

WARNING
CAUTION
Outdoor units operate under a wide range of weather con-
ditions; therefore, several factors must be considered
when positioning the outdoor unit. Unit must be positioned
to give adequate clearances for sufficient airflow and servi-
cing. A minimum clearance of 24 inches (610 mm) be-
tween multiple units must be maintained. Refer to figure 1
for installation clearances.
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. Ira 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,
STRUCTURE DISCHARGE AIR
,I/I/I/I/I/
l/I/////
MOUNTING SLAB MUST SLOPE
AWAY FROM BUILDING. GROUNDLEVEL
Figure 2. Slab Mounting At Ground Level
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,
Page 3
13HPX SERIES

PREVAILINGWINTERWINDS
©
I WINDBARRIER I
INLET AIR
INLET AIR INLET AIR
0 0
0
INLET AIR
Figure 3. Rooftop Application Wind Barrier
Construction
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 U.S.A., 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.
.
.
.
Ground unit at unit disconnect switch or to an earth
ground.
NOTE -Tofacilitate conduit, a hole is in the bottom of
the control box. Connect conduit to the control box
using a proper conduit fitting.
NO TE -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 4
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 6 and
7.
NOTE - 24V, Class II circuit connections are made in
the low voltage junction box.
OUAL
CAPACITOR @_ @ ._.-
_C_
--- @
THERIIOST AT
,_ II_j, I
_-_J_j II
..... .I
208-230/60/I
mll 2 _
1,6ROUND
Z_ NOTE-
FOR USE WITH COPPER CONDUCTORS ONLY.REFER TO UNIT RATING
PLATE FOR MINIMUM CIRCUIT AUPACITY AND MAXIMUM OVER-
CURRENT PROTECTION SIZE
WARNING-
ELECTRIC SHOCK HAZARD,
Z_ CAN CAUSE INJURYOR DEATH.
UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL
AND LOCAL CODES.
Figure 4. Typical Field Wiring Diagram
505325 03/08
Page 4

OUTDOOR
FAN
PURPLE
BLACK
ORANGE
RED
LLOW
COMPRESSOR
CRANKCASE HEATER
BLACK
GROUND
LUG
)_DUAL
CAPACITOR
BLACK
BLACK
DEFROST CONTROL
FANT
pOUT
LO-PS R 0
-_ O 0
YI
COMMON
Y I BUT
HI=PS
THERMOSTAT
o.r_.,o®e]
I I I t _
Iljll
----Jl II
J I I
J l
J
208-230/60/I
IIL2 z_x
DLE
I,'BROUNO
CMC FAN
o OUT
LO--PB
OF L
RO
COMMON yO
_OUT I
HI -PS
THERMOSTATOEPROSTb _REVERSINGvALVE
LB20:B3OXBOZ';
"]_ _IORANGF ¢_
T _ BLACK IS
I_._ b Ir- r_v _ I
EQUIPMENTHR' ]__A_ _L-_c_ SLACK KI_
r_ NOTE-
FOR USE WITH COPPER CONDUCTORS
DESCRIPTION ONLY.REFER TO UNIT RATING
<EY COMPONENT PLATE FOR MINIMUM CIRCUIT
hi COMPRESSOR AMPACITY AND MAXIMUM OVER-
84- _OTOR-OUTDOOR FAN CURRENT PROTECTION SIZE.
CJ2 CAPACITOR- DUAL
CMCI CONTROL-DEFROST A
4RI hEATER-COMPRESSOR $41 TO BE MOUNTED IN
_11-1 :ONTACTOR-COMPREBBOR CONTROL BOX AND WIRED
L ¢ALVE=REVERSING IN PARALLEL WITH LOW
]4 _WITCH=HIGH PRESSURE PRESSURE SWITCH
_6 5W] TCH=DEFROST
540 THERMOSTAT-CRANKCASE
341 FHERMOSTAT=LOW AMBIEN_
_87 _WITCH=LOW PRESSURE
LOW 587
__ I I I LOW
II_)_ZENTpRESSU2#
II
'11
I I
CONNECTION MUST BE JUMPERED WHEN
OPTIONAL SWITCH IS NOT USED
WARNING-
ELECTRIC SHOCK HAZARD,CAN CAUSE INJURY OR
DEATH. UNIT MUST BE GROUNDED IN ACCORDANCE
WITH NATIONAL AND LOCAL CODES,
-,,_-------DENOTES OPTIONAL COMPONENTS
LINE VOLTAGE FIELD INSTALLED
-- -- -- CLASS I I VOLTAGE FIELD INSTALLED
Figure 5. 13HPX Outdoor Unit Typical Wiring Diagram
Page 5
13HPX SERIES

Thermostat
power
common
(_) 1st. stage aux. heat
Indoor
Unit
-k_
@
indoor blower .
reversing valve
compressor
(SOME CONNECTIONS MAY NOT APPLY. REFER
TO SPECIFIC THERMOSTAT AND INDOOR UNIT.)
Outdoor
Unit
power
common
1st. stage aux. heat _)
G
@
Figure 6.13HPX and Blower Unit Thermostat Desig-
nations
Indoor
Thermostat Unit
®
power
common ¢
L
emergency heat It
]
I
I
1st. stage aux. heat _-
L
indoor blower
reversing valve
.power
_ common
emer.
J outdoor t'stat
-lZ_st. stage aux. heat
@J
®l
compressor
(SOME CONNECTIONS MAY NOT APPLY. REFER TO
SPECIFIC THERMOSTAT AND INDOOR UNIT.)
Outdoor
Unit
Figure 7. Outdoor Unit and Blower Unit Thermostat
Designations (with auxiliary heat)
If the 13HPX unit is being installed with a new indoor coil
and line set, the plumbing connections should be made as
outlined in this section. If an existing line set and/or indoor
coil is going to be used to complete the 13HPX system, re-
fer to the following section that includes flushing proce-
dures,
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 field-fabricated refrigerant lines,
Refer to Refrigerant Piping Guide (Corp. 9351-L9) for
proper size, type, and application of field-fabricated lines.
Valve sizes are also listed in table 2,
PLUMBING CONNECTIONS--13HPX MATCHED
WITH NEW INDOOR COIL AND LINE SET
If you are replacing an existing coil that is equipped with a
liquid line functioning as a metering orifice, replace the liq-
uid line prior to installing the 13HPX unit, See table 2.
Model
-018
-024
-030
-O36
-042
-048
-060
Table 2. Refrigerant Line Sets
Field
Connections
Liquid Vapor
Line Line
3/8 in. 3/4 in
(10 mm) (19 mm)
3/8 in. 7/8 in
(10 mm) (22 mm)
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
(10 (19 15ft,- 50ft.
mm) mm) (4.6 m - 15
m)
3/8 in. 7/8 in L15-65
(10 (22 15ft.- 50 ft.
mm) mm) (4.6 m - 15
m)
3/8 in. 1-1/8
in, Field
(10
mm) (29) 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 2 to ensure that oil returns to the compressor.
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 8 shows how to place the outdoor
unit and line set.
Install unit away
from windows.
Two 90° elbows
installed in line set will
line set vibration.
Figure 8. Unit Placement and Installation
2. Line Set Isolation--The following illustrations dem-
onstrate procedures which ensure proper refrigerant
line set isolation. Figure 9 shows how to install line sets
on horizontal runs. Figure 10 shows how to install line
sets on vertical runs. Figure 11 shows how to make a
transition from horizontal to vertical.
505325 03/08
Page 6

To hang line set from joist or rafter,
use either metal strapping material
or anchored heavy nylon wire ties.
STRAPPING MATERIAL
(Around vapor line only)
8 feet
FLOOR JOIST OR
ROOF RAFTER
r\
WIRE TIE
(Around vapor line only)
TAPE OR
8 feet WIRE TIE
METAL FLOOR JOIST OR .
SLEEVE ROOF RAFTER
Strap the vapor line to the joist or
rafter at 8 ft. intervals then strap
the liquid line to the vapor line.
TAPE OR WIRE TIE
Figure 9. Refrigerant Line Sets: Installing Horizontal Runs
NOTE -Similar installation practices should be used if line set is to be installed on exterior of 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
\
CAULK
PVC PIPE FIBERGLASS
INSULATION
Figure 10. Refrigerant Line Sets: Installing Vertical Runs (new construction shown)
Page 7
13HPX SERIES

ANCHORED
HEAVY NYLON
WIRE TIE
AUTOMOTIVE
MUFFLER-TYPE
HANGER
WALL
STUD WALL
STUD
Strap Liquid Line
To Vapor Line
LIQUID LINE
Strap Liquid Line
To Vapor Line
LIQUID LINE
METAL SLEEVE VAPOR LINE (WRAPPED IN ARMAFLEX) VAPOR LINE -WRAPPED IN ARMAFLEX
Figure 11. Refrigerant Line Sets: Transition From Vertical To Horizontal
WARNING I 5, Install a field-provided thermal expansion valve (ap-proved for use with HFC-410A refrigerant) in the liquid
line at the indoor coil,
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.
3, 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,
4. 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,
NOTE -The tube end must stay bottomed in the fitting
during final assembly to ensure proper seating, seal-
ing and rigidity.
Page 8
505325 03/08
_WARNING
IMPORTANT
CAUTION

RECOVERY CYLINDER
Inverted HCFC-22 Cylinder
(Contains clean HCFC-22 to be
used for flushing)
EXISTING VAPOR LINE VAPOR LINE
SERVICE VALVE
EXISTING LIQUID LINE LIQUID LINE
SERVICE VALVE
/ REOU,REDO. ank
SOME MACHINES.
Inlet
rDischarge
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 12. Flushing Connections
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.
• 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 8) 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 the outdoor unit service valves at this
time.
AIMPORTANT
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 13HPX
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.
Page 9
13HPX SERIES

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 13HPX service
valves.
11. Install the provided check/expansion valve (approved
for use with HFC-410A refrigerant) in the liquid line at
the indoor coil.
13HPX units are used in check expansion valve (TXV) sys-
tems only, See the Lennox Engineering Handbook for ap-
proved TXV match-ups and application information.
NOTE -HFC-410A systems will not operate properly with
an HCFC-22 valve.
Check expansion valves equipped with Chatleff fittings are
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
13HPX-018, -024, -030, -036 49L24
13HPX-042, -048 49L25
13HPX-060 91M02
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 13 for instal-
lation of the check expansion valve.
/STRAINER
DISTRIBUTOR _"(_ LITQUBIDLINE
NOTE - If necessary, remove HCFC-22 flow control device (fixed
orifice/thermal expansion valve) from existing line set before instal-
ling HFC-410A approved expansion valve and o-ring,
Figure 13. 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 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 (liquid line - figure 14, vapor line - figure
15) 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.
SCHRADER
VALVE [OPEN TO
LINE SET WHEN
VALVE IS CLOSED
]FRONT SEATED)]
TO
OUT-
STEM INSERT HEX
CAP
_TO
INDOOR
SERVICE COIL
PORT CAP ]VALVE FRON%SEATED)
Valve in closed position Valve in open position
Figure 14. Liquid Line Service Valve
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 2).
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 2).
TO CLOSE FRONT-SEATED SERVICE VALVES:
1. Remove the stem cap with an adjustable wrench.
505325 03/08
Page 10