Comfortaire HRG18 S1P Series User manual

Installation and Operation Manual - HRG18xxS1P
508133M01 Page 1 of 23Issue 2106
INSTALLATION INSTRUCTIONS
HRG18 Units
(R410A Refrigerant)
Manufactured By
Comfort-Aire / Century
1900 Wellworth Ave.
Jackson, MI 49203
(P) 508133M01
*P508133M01*
Table of Contents
Application...................................................................1
General........................................................................2
Installation ...................................................................2
Refrigerant Piping........................................................4
Electrical - Circuit Sizing and Wire Routing...............13
Thermostat Control and Low Voltage Control Wiring 13
Outdoor Unitary Control.............................................17
Start-Up .....................................................................18
Maintenance..............................................................20
Homeowner Information ............................................21
This manual must be left with the homeowner for future reference.
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to
the potential for personal injury or death.
Installation and servicing of air conditioning equipment
can be hazardous due to internal refrigerant pressure
and live electrical components. Only trained and
qualied service personnel should install or service
this equipment. Installation and service performed by
unqualied persons can result in property damage,
personal injury, or death.
WARNING
Sharp metal edges can cause injury. When installing
the unit, use care to avoid sharp edges.
WARNING
ELECTRICAL SHOCK HAZARD!
Risk of electrical shock. Disconnect all
remote power supplies before installing
or servicing any portion of the system.
Failure to disconnect power supplies
can result in property damage, personal
injury, or death.
WARNING
Application
These units are designed for use in residential and light
commercial type buildings. Units should be installed with
approved indoor matches listed in the Air-Conditioning,
Heating and Refrigeration Institute (AHRI) Directory of
Certied Products. Refer to http://www.ahridirectory.org.
The Clean Air Act of 1990 bans the intentional venting
of refrigerant (CFCs, HCFCs and HFCs) as of July
1, 1992. Approved methods of recovery, recycling or
reclaiming must be followed. Fines and/or incarceration
may be levied for noncompliance.
IMPORTANT

Installation and Operation Manual - HRG18xxS1P
Page 2 of 23 508133M01Issue 2106
General
Read this entire instruction manual, as well as the
instructions supplied in separate equipment, before
starting the installation. Observe and follow all warnings,
cautions, instructional labels, and tags. Failure to comply
with these instructions could result in an unsafe condition
and/or premature component failure.
These instructions are intended as a general guide only
for use by qualied personnel and do not supersede any
national or local codes in any way. The installation must
comply with all provincial, state, and local codes as well as
the National Electrical Code (U.S.) or Canadian Electrical
Code (Canada). Compliance should be determined prior
to installation.
This unit uses R-410A, which is an ozone-friendly HFC
refrigerant. The unit must be installed with a matching
indoor coil and line set. A lter drier approved for use with
R-410A is installed in the unit.
IMPORTANT: This product has been designed and
manufactured to meet ENERGY STAR criteria for energy
eciency when matched with appropriate coil components.
However, proper refrigerant charge and proper air ow
are critical to achieve rated capacity and eciency.
Installation of this product should follow the manufacturer’s
refrigerant charging and air ow instructions. Failure to
conrm proper charge and airow may reduce energy
eciency and shorten equipment life.
Inspection of Shipment
Upon receipt of equipment, carefully inspect it for possible
shipping damage. If damage is found, it should be noted
on the carrier’s freight bill. Take special care to examine
the unit inside the carton if the carton is damaged. Any
concealed damage discovered should be reported to the
last carrier immediately, preferably in writing, and should
include a request for inspection by the carrier’s agent.
If any damages are discovered and reported to the carrier
DO NOT INSTALL THE UNIT, as claim may be denied.
Check the unit rating plate to conrm specications are as
ordered.
Safety Precautions
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for brazing operations.
Have re extinguisher available. Read these instructions
thoroughly and follow all warning or cautions attached to
the unit.
1. Always wear proper personal protection equipment.
2. Always disconnect electrical power before removing
panel or servicing equipment.
3. Keep hands and clothing away from moving parts.
4. Handle refrigerant with caution; refer to proper MSDS
from refrigerant supplier.
5. Use care when lifting, avoid contact with sharp edges.
Installation
NOTE: In some cases, noise in the living area has been
traced to gas pulsations from improper installation of
equipment.
• Locate unit away from windows, patios, decks, etc.
where unit operation sounds may disturb customer.
• Leave some slack between structure and unit to
absorb vibration.
• Place a sound-absorbing material, such as Isomode,
under the unit if it will be installed in a location or
position that will transmit sound or vibration to the
living area or adjacent buildings.
• Install the unit high enough above the ground or roof to
allow adequate drainage of defrost water and prevent
ice buildup.
• In heavy snow areas, do not locate the unit where
drifting snow 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
support frame is constructed, it must not block drain
holes in unit base.
• When installed in areas where low ambient
temperatures exist, locate unit so winter prevailing
winds do not blow directly into outdoor coil.
• Locate unit away from overhanging roof lines which
would allow water or ice to drop on, or in front of, coil
or into unit.
To prevent personal injury, as well as damage to panels,
unit or structure, observe the following:
While installing or servicing this unit, carefully stow all
removed panels so that the panels will not cause injury
to personnel, objects or nearby structures. Also, take
care to store panels where they will not be subject to
damage (e.g., being bent or scratched).
While handling or stowing the panels, consider any
weather conditions (especially wind) that may cause
panels to be blown around and damaged.
WARNING

Installation and Operation Manual - HRG18xxS1P
508133M01 Page 3 of 23Issue 2106
Exhaust vents from dryers, water heaters and furnaces
should be directed away from the outdoor unit.
Prolonged exposure to exhaust gases and the chemicals
contained within them may cause condensation to form
on the steel cabinet and other metal components of the
outdoor unit. This will diminish unit performance and
longevity.
IMPORTANT
When outdoor unit is connected to factory-approved indoor
unit, outdoor unit contains system refrigerant charge for
operation with matching indoor unit when connected by 15
ft. of eld-supplied tubing. For proper unit operation, check
refrigerant charge using charging information located on
control box cover.
Indoor Coil TXV Selection
The outdoor section must be matched to a factory approved
indoor section. It is mandatory that the installer ensure that
the correct TXV is installed in the indoor section. Reference
Refrigerant Piping - Typical Existing Fixed Orice Removal
Procedure. If necessary, remove the existing piston and
replace it with the correct TXV. See Refrigerant Piping -
Typical Existing Expansion Valve Removal Procedure for
details of changing the piston or TXV. The HRG18 models
are only rated with TXV on the indoor coil.
Outdoor Section
Zoning ordinances may govern the minimum distance the
condensing unit can be installed from the property line.
Discharge Air
Mounting Slab
Ground Level
Building
Structure
Mounting slab must slope slightly away from
building, not to exceed 1/4” per foot.
Figure 1. Slab Mounting
Install on a Solid, Level Mounting Pad
The outdoor section is to be installed on a solid foundation.
This foundation should extend a minimum of 2” (inches)
beyond the sides of the outdoor section. To reduce the
possibility of noise transmission, the foundation slab
should NOT be in contact with or be an integral part of the
building foundation. See Figure 1.
If conditions or local codes require the unit be attached to
pad or mounting frame, tie down bolts should be used and
secured to unit base pan.
Elevate Unit
Accumulation of water and ice in base pan may cause
equipment damage.
CAUTION
Elevate unit per local climate and code requirements to
provide clearance above estimated snowfall level and
ensure adequate drainage of unit. Use snow stand in areas
where prolonged freezing temperatures are encountered.
If conditions or local codes require the unit be attached to
pad or mounting frame, tie down bolts should be used and
fastened through knockouts provided in unit base pan.
Clearance Requirements
When installing, allow su󰀩cient space for airow clearance,
wiring, refrigerant piping, and service. For proper airow,
quiet operation and maximum e󰀩ciency. Position so water,
snow, or ice from roof or eaves cannot fall directly on unit.
Refer to Table 1 for installation clearances.
Location Minimum Clearance
Service box 30”
Top of unit* 48”
Between units 24”
Against wall 6”
* Maximum so󰀩t overhang is 36”.
NOTE: At least one side should be unobstructed by a wall or
other barrier.
Table 1. Clearances
30” around
Control
Box
24”
6”*
NOTE: See Table 2 for specific minimum
clearance guidelines.
Figure 2.

Installation and Operation Manual - HRG18xxS1P
Page 4 of 23 508133M01Issue 2106
Refrigerant Piping
• Use only refrigerant grade copper tubes.
• Split systems may be installed with up to 50 feet of
line set (no more than 20 feet vertical) without special
consideration (see long line set guidelines).
• Ensure that vapor and liquid tube diameters are
appropriate to capacity of unit.
• Run refrigerant tubes as directly as possible by
avoiding unnecessary turns and bends.
• When passing refrigerant tubes through the wall, seal
opening with RTV or other silicon-based caulk.
• Avoid direct tubing contact with water pipes, duct work,
oor joists, wall studs, oors, walls, and any structure.
• Do not suspend refrigerant tubing from joists and
studs with a rigid wire or strap that comes in direct
contact with tubing.
• Ensure that tubing insulation is pliable and completely
surrounds vapor tube.
It is important that no tubing be cut or seals broken until you
are ready to actually make connections to the evaporator
and to the condenser section. DO NOT remove rubber
plugs or copper caps from the tube ends until ready to
make connections at evaporator and condenser. Under no
circumstances leave the lines open to the atmosphere for
any period of time, if so unit requires additional evacuation
to remove moisture.
Operating
Mode
18 SEER
Liquid Line Suction Line
2 Ton 3/8 3/4
3 Ton 3/8 3/4
4 Ton 3/8 7/8
5 Ton 3/8 1 1/8
Table 2.
Be extra careful with sharp bends. Tubing can “kink” very
easily, and if this occurs, the entire tube length will have
to be replaced. Extra care at this time will eliminate future
service problems.
It is recommended that vertical suction risers not be up-
sized. Proper oil return to the compressor should be
maintained with suction gas velocity.
Filter Drier
The lter drier is very important for proper system operation
and reliability. If the drier is shipped loose, it must be
installed by the installer in the eld. Unit warranty will be
void, if the drier is not installed.
Installation of Line Sets
DO NOT fasten liquid or suction lines in direct contact with
the oor or ceiling joist. Use an insulated or suspension
type of hanger. Keep both lines separate, and always
insulate the suction line. Liquid line runs (30 feet or more)
in an attic will require insulation. Route refrigeration line
sets to minimize length.
DO NOT let refrigerant lines come in direct contact with
foundation. When running refrigerant lines through the
foundation or wall, openings should allow for a sound
and vibration absorbing material to be placed or installed
between tubing and foundation. Any gap between
foundation or wall and refrigerant lines should be lled with
a vibration damping material.
DO LOCATE THE UNIT:
• With proper clearances on sides and top of unit
• On a solid, level foundation or pad (unit must be level
to within ± 1/4 in./ft. per compressor manufacturer
specications)
• To minimize refrigerant line lengths
DO NOT LOCATE THE UNIT:
• On brick, concrete blocks or unstable surfaces
• Near clothes dryer exhaust vents
• Near sleeping area or near windows
• Under eaves where water, snow or ice can fall directly
on the unit
• With clearance less than 2 ft. from a second unit
• With clearance less than 4 ft. on top of unit
Operating Ambient
The minimum outdoor operating ambient in cooling mode
is 55°F, and the maximum outdoor operating ambient in
cooling mode is 125°F. The maximum outdoor operating
ambient in heating mode is 66°F.
Rooftop Installations
Install unit at a minimum of 6” above surface of the roof
to avoid ice buildup 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 rooftop
applications.
If unit cannot be mounted away from prevailing winds, a
wind barrier should be constructed. Due to variation in
installation applications, size and locate barrier according
to the best judgment of the installer.

Installation and Operation Manual - HRG18xxS1P
508133M01 Page 5 of 23Issue 2106
If ANY refrigerant tubing is required to be buried by state
or local codes, provide a 6 inch vertical rise at service
valve.
CAUTION
Polyvinyl ether (PVE) oils used with HFC-410A
refrigerant absorb moisture very quickly. It is very
important that the refrigerant system be kept closed
as much as possible. DO NOT remove line set caps
or service valve stub caps until you are ready to make
connections.
WARNING
Do NOT attempt to ush and re-use existing line sets
or indoor coil when the system contains contaminants
(i.e., compressor burn out).
CAUTION
“Clean refrigerant” is any refrigerant in a system that
has not had compressor burnout. If the system has
experienced burnout, it is recommended that the
existing line set and indoor coil be replaced.
NOTE
In lieu of R-410A, an industry-standard ushing agent
may also be used.
NOTE
Suction Traps
For systems with the outdoor unit 5 - 60 feet above the
indoor unit, one trap must be installed at the bottom of the
suction riser.
NOTE: Special consideration must be taken for line sets
over 50 feet. See Refrigerant Piping Guidelines.
Tonnage * Valve Size Connections Recommended Line Sets
Liquid Line Suction Line Line Set Length
-024
3/8” (10mm)
3/4” (19mm) 30’ (9.1m)
-036 40’ (12.2m)
-048 7/8” (22mm) 50’ (15.2m)
-060 1-1/8” (29mm) ** Field-fabricated
* Applicable to all minor revision numbers unless otherwise specied.
** Some applications may require a eld-provided 1-1/8” to 7/8” adapter.
Table 3. Standard Refrigerant Line Set – Up to 50 Linear Feet in Length

Installation and Operation Manual - HRG18xxS1P
Page 6 of 23 508133M01Issue 2106
1. On fully cased coils, remove the coil access and
plumbing panels.
2. Remove any shipping clamps from the liquid line and
distributor assembly.
3. Disconnect the equalizer line from the tting on the
vapor line.
4. Remove the vapor line sensing bulb.
5. Disconnect the liquid line from the expansion valve at
the liquid line assembly.
6. Disconnect the expansion valve from the liquid line
orice housing. Take care not to twist or damage
distributor tubes during this process.
7. Remove and discard expansion valve and the two
Teon®rings.
8. Use a eld-provided tting to temporarily reconnect the
liquid line to the indoor unit’s liquid line orice housing.
Connect Gauges and Equipment for Flushing
Procedure
LOW HIGH
EXISTING
INDOOR
UNIT
GAUGE
MANIFOLD
CYLINDER CONTAINING
CLEAN R-410A TO BE
USED FOR FLUSHING
(Positioned to deliver liquid
refrigerant)
LIQUID LINE SERVICE
VALVE
INLET
DISCHARGE
TANK
RETURN
CLOSED
OPENED
RECOVERY
CYLINDER
RECOVERY MACHINE
NEW
OUTDOOR
UNIT
VAPOR LINE
SERVICE VALVE
VAPOR
LIQUID
1
1
2
3
4
Figure 5. Connecting Gauges
1. Cylinder with clean R-410A (positioned to deliver liquid
refrigerant) to the vapor service valve.
2. Refrigerant gauge set (low side) to the liquid line valve.
3. Refrigerant gauge set center port to inlet on the
recovery machine with an empty recovery tank
connected to the gauge set.
4. Connect recovery tank to recovery machine per
machine instructions.
Typical Existing Fixed Orice Removal
Procedure
TEFLON®RING
FIXED ORIFICE
BRASS NUT
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
LIQUID LINE ORIFICE HOUSING
DISTRIBUTOR TUBES
DISTRIBUTOR
ASSEMBLY
REMOVE AND DISCARD
WHITE TEFLON®SEAL
(IF PRESENT)
Figure 3. Remove Fixed Orice
(Uncased Coil Shown)
1. On fully cased coils, remove the coil access and
plumbing panels.
2. Remove any shipping clamps from the liquid line and
distributor assembly.
3. Using two wrenches (one to hold the orice housing
and one to remove the brass nut), disconnect liquid
line from liquid line orice housing. Take care not to
twist or damage distributor tubes during this process.
4. Remove and discard xed orice, valve stem assembly
(if present) and Teon®washer, as shown in Figure 3.
5. Use a eld-provided tting to temporarily reconnect the
liquid line to the indoor unit’s liquid line orice housing.
Typical Existing Expansion Valve Removal
Procedure
SENSING
LINE
TWO-PIECE PATCH PLATE
(UNCASED COIL ONLY)
VAPOR
LINE
DISTRIBUTOR
ASSEMBLY
DISTRIBUTOR
TUBES
LIQUID
LINE
MALE EQUALIZER
LINE FITTING
EQUALIZER
LINE
EXPANSION
VALVE
TEFLON®
RING
STUB END
TEFLON®
RING
SENSING BULB
LIQUID LINE
ORIFICE
HOUSING
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
Figure 4. Remove Expansion Valve
(Uncased Coil Shown)

Installation and Operation Manual - HRG18xxS1P
508133M01 Page 7 of 23Issue 2106
Flushing Line Sets
If the unit will be installed in an existing system that uses
an indoor unit or line sets charged with R-22 refrigerant,
installer must perform the following ushing procedure.
NOTE: Existing system components (including line set
and indoor coil) must be an AHRI match with the unit in
order to fulll unit warranty requirements.
Fire, Explosion and Personal Safety
hazard. Failure to follow this warning
could result in damage, personal injury or
death.
Never use oxygen to pressurize or
purge refrigeration lines. Oxygen, when
exposed to a spark or open ame, can
cause re and/or an explosion, that could
result in property damage, personal injury
or death.
WARNING
When using a high pressure gas such as
nitrogen to pressurize a refrigeration or air
conditioning system, use a regulator that can
control the pressure down to 1 or 2 psig (6.9
to 13.8 kPa).
WARNING
Refrigerant must be reclaimed in accordance with
national and local codes.
WARNING
1. 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
existing system line set and indoor unit coil.
2. Position the cylinder of clean R-410A for delivery of
liquid refrigerant and open its valve to allow liquid
refrigerant to ow into the system through the vapor
line valve. Allow the refrigerant to pass from the
cylinder and through the line set and the indoor unit
coil before it enters the recovery machine.
3. After all of the liquid refrigerant has been recovered,
switch the recovery machine to vapor recovery so
that all of the R-410A vapor is recovered. Allow the
recovery machine to pull the system down to 0.
4. Close the valve on the inverted R-410A drum and the
gauge set valves. Pump the remaining refrigerant out
of the recovery machine and turn the machine o󰀨.

Installation and Operation Manual - HRG18xxS1P
Page 8 of 23 508133M01Issue 2106
Refrigerant Piping - Install Indoor Expansion Valve
This outdoor unit is designed for use in systems that include a heat pump expansion valve metering device at the indoor
coil. See the Product Specications for approved expansion valve kit match-ups and application information. The expansion
valve unit can be installed internal or external to the indoor coil. In applications where an uncased coil is being installed
in a eld-provided plenum, install the expansion valve in a manner that will provide access for future eld service of the
expansion valve. Refer to below illustration for reference during installation of expansion valve unit.
1 -Attach the vapor line sensing bulb in the proper
orientation as illustrated to the right using the clamp and
screws provided.
NOTE - Though it is preferred to have the sensing bulb
installed on a horizontal run of the vapor line, installation
on a vertical run of piping is acceptable if necessary.
NOTE - Confirm proper thermal contact between vapor
line and check/expansion bulb before insulating the
sensing bulb once installed.
2 -Connect the equalizer line from the check expansion
valve to the equalizer vapor port on the vapor line. Finger
tighten the flare nut plus 1/8 turn (7 ft-lbs) as illustrated
below.
TWO PIECE
PATCH PLATE
(UNCASED
COIL ONLY)
VAPOR
LINE
LIQUID LINE
ORIFICE
HOUSING
DISTRIBUTOR
TUBES
LIQUID LINE
MALE EQUALIZER LINE
FITTING (SEE
EQUALIZER LINE
INSTALLATION FOR
FURTHER DETAILS)
SENSING
LINE
EQUALIZER
LINE
EXPANSION
VALVE
TEFLON®
RING
(Uncased Coil Shown)
Sensing bulb insulation is required if
mounted external to the coil casing. sensing
bulb installation for bulb positioning.
STUB
END
TEFLON®
RING
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
DISTRIBUTOR
ASSEMBLY
3 -Install one of the provided Teflon®rings around the
stubbed end of the check expansion valve and lightly
lubricate the connector threads and expose surface of
the Teflon®ring with refrigerant oil.
4 -Attach the stubbed end of the check expansion valve to
the liquid line orifice housing. Finger tighten and use an
appropriately sized wrench to turn an additional 1/2 turn
clockwise as illustrated in the figure above, or tighten to
20 ft-lb.
5 -Place the remaining Te flon®washer around the other
end of the check expansion valve. Lightly lubricate
connector threads and expose surface of the Teflon®
ring with refrigerant oil.
6 -Attach the liquid line assembly to the check expansion
valve. Finger tighten and use an appropriately sized
wrench to turn an additional 1/2 turn clockwise as
illustrated in the figure above or tighten to 20 ft-lb.
ON 7/8” AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION.
12
ON LINES SMALLER THAN
7/8”, MOUNT SENSING
BULB AT EITHER THE 3 OR
9 O'CLOCK POSITION.
12
BULB
VAPOR LINE
VAPOR LINE
NOTE - NEVER MOUNT THE SENSING BULB ON
BOTTOM OF LINE.
BULB
BULB
BULB
VAPOR LINE
FLARE NUT
COPPER FLARE
SEAL BONNET
MALE BRASS EQUALIZER
LINE FITTING
FLARE SEAL CAP
OR
1
2
3
4
5
6
7
8
9
10
11 12
1/2 Turn
SENSING BULB INSTALLATION
EQUALIZER LINE INSTALLATION
1
2
3
4
5
6
7
8
9
10
11 12
1/8 Turn
1 -Remove and discard either the flare seal cap or flare nut
with copper flare seal bonnet from the equalizer line port
on the vapor line as illustrated in the figure below.
2 -Remove the field-provided
sembly.
INDOOR EXPANSION VALVE INSTALLATION

Installation and Operation Manual - HRG18xxS1P
508133M01 Page 9 of 23Issue 2106
ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND VAPOR LINE SERVICE VALVES
OUTDOOR
UNIT
LIQUID LINE
VAPOR LINE
LIQUID LINE SERVICE
VALVE
VAPOR LINE
SERVICE
VALVE
ATTACH
GAUGES
INDOOR
UNIT
VAPOR SERVICE PORT MUST BE OPEN
TO ALLOW EXIT POINT FOR NITROGEN
A -Connect gauge set low pressure side to
liquid line service valve (service port).
B -Connect gauge set center port to bottle of
nitrogen with regulator.
C -Remove core from valve in vapor line
service port to allow nitrogen to escape.
NITROGEN
HIGHLOW USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
B
A
C
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALV E.
Flow regulated nitrogen (at 1 to 2 psig) through the low-side refrigeration gauge set into the liquid line service port valve, and out of the
vapor line service port valve.
CUT AND DEBUR CAP AND CORE REMOVAL
Cut ends of the refrigerant lines square (free from nicks or dents)
and debur the ends. The pipe must remain round. Do not crimp end
of the line.
Remove service cap and core from
both the vapor and liquid line service
ports.
12
LIQUID LINE SERVICE
VALVE
SERVICE
PORT
CORE
SERVICE PORT
CAP
SERVICE
PORT
CORE
SERVICE
PORT CAP
CUT AND DEBUR
LINE SET SIZE MATCHES
SERVICE VALVE CONNECTION
DO NOT CRIMP SERVICE VALVE
CONNECTOR WHEN PIPE IS
SMALLER THAN CONNECTION
3
VAPOR LINE SERVICE
VALVE
COPPER TUBE
STUB
REFRIGERANT LINE
REDUCER
SERVICE VALVE
CONNECTION
LINE SET SIZE IS SMALLER
THAN CONNECTION
Refrigerant Piping - Brazing Procedures
Before brazing, ensure the system is fully
recovered of all refrigerant. Application of a
brazing torch to a pressurized system may
result in ignition of the refrigerant and oil
mixture. Check the high and low pressures
before applying heat.
WARNING
Brazing alloys and ux contain materials which are
hazardous to your health.
Avoid breathing vapors or fumes from brazing
operations. Perform operations only in well-ventilated
areas.
Wear gloves and protective goggles or face shield to
protect against burns.
Wash hands with soap and water after handling brazing
alloys and ux.
WARNING
Use a manifold gauge set designed for use on R-410A
refrigerant systems.
NOTE

Installation and Operation Manual - HRG18xxS1P
Page 10 of 23 508133M01Issue 2106
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
LIQUID LINE SERVICE VALVE
LIQUID LINE
BRAZE LINE SET
Wrap both service valves with water-saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set.
Cloths must remain water-saturated throughout the brazing and cool-down process.
WATER-SATURATED
CLOTH
IMPORTANT — Allow braze joint to cool. Apply
additional water-saturated cloths to help cool brazed
joint. Do not remove water-saturated cloths until
piping has cooled. Temperatures above 250ºF will
damage valve seals.
6
VAPOR LINE
WATER-SATURATED
CLOTH
VAPOR LINE
SERVICE VALVE
After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water-saturated cloths to both
services valves to cool piping. Once piping is cool, remove all water-saturated cloths.
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
PREPARATION FOR NEXT STEP
7
WRAP SERVICE VALVES
To help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Use
additional water-saturated cloths underneath the valve body to protect the base paint.
4
FLOW NITROGEN
Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and
out of the vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections.
5
WARNING
FIRE, PERSONAL INJURY, OR PROPERTY DAMAGE
may result if you do not wrap a water-saturated cloth around
both liquid and suction line service valve bodies and copper
tube stub while brazing the line set! The braze, when
complete, must be quenched with water to absorb any
residual heat.
Do not open service valves until refrigerant lines and
indoor coil have been leak-tested and evacuated. Refer
to Leak Test and Evacuation section of this manual.
WARNING
While protecting the
service valve seals with
water-saturated cloths,
ensure that water does
NOT enter the system.

Installation and Operation Manual - HRG18xxS1P
508133M01 Page 11 of 23Issue 2106
TO VAPOR
SERVICE VALVE
HFC-410A
MANIFOLD GAUGE SET
OUTDOOR UNIT
HIGH
LOW
1
2
A
B
NITROGEN
NOTE - Position
canister to deliver
liquid refrigerant.
A -With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of the
manifold gauge set. Open the valve on the HFC-410A cylinder (vapor only).
B - Open the high pressure side of the manifold to allow HFC-410A into the line set and indoor unit. Weigh in
a trace amount of HFC-410A.[A trace amount is a maximum of two ounces (57 g) refrigerant or three
pounds (31 kPa) pressure.] Close the valve on the HFC-410A cylinder and the valve on the high
pressure side of the manifold gauge set. Disconnect the HFC-410A cylinder.
C - Connect a cylinder of nitrogen with a pressure regulating valve to the center port of the manifold gauge
set.
D - Adjust nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge set
in order to pressurize the line set and the indoor unit.
E - After a few minutes, open one of the service valve ports and verify that the refrigerant added to the
system earlier is measurable with a leak detector.
F -
After the line set has been connected to the indoor and outdoor units, check the line set connections and
indoor unit for leaks. Use the following procedure to test for leaks:
A -Connect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port.
NOTE - Normally, the high pressure hose is connected to the liquid line port. However, connecting it
to the vapor port better protects the manifold gauge set from high pressure damage.
B - With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of
the manifold gauge set.
CONNECT GAUGE SET
TEST FOR LEAKS
NOTE - Later in the procedure, the HFC-410A container will be replaced by the nitrogen container.
After leak testing, disconnect gauges from service ports.
NOTE - Service valve cores remain removed for the following evacuation procedure.
LEAK TEST
Leak Test and Evacuation

Installation and Operation Manual - HRG18xxS1P
Page 12 of 23 508133M01Issue 2106
A - Open both manifold valves and start the vacuum pump.
B -
NOTE - During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. A rapid rise in pressure
indicates a relatively large leak. If this occurs, repeat the leak testing procedure.
NOTE - The term absolute pressure means the total actual pressure above absolute zero within a given volume or system. Absolute
pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.
C - When the absolute pressure reaches 23,000 microns (29.01 inches of
mercury), perform the following:
Close manifold gauge valves.
Close valve on vacuum pump.
Turn off vacuum pump.
Disconnect manifold gauge center port hose from vacuum pump.
Attach manifold center port hose to a nitrogen cylinder with pressure
regulator set to 150 psig (1034 kPa) and purge the hose.
Open manifold gauge valves to break the vacuum in the line set and indoor
unit.
Close manifold gauge valves.
D - Shut off the nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the
nitrogen from the line set and indoor unit.
E - Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the
absolute pressure does not rise above 500 microns (29.9 inches of mercury) within a 20-minute period after shutting off the vacuum pump
and closing the manifold gauge valves.
F - When the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to a
cylinder of HFC-410A positioned to deliver liquid refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the
line set and indoor unit.
G - Perform the following:
Close manifold gauge valves.
Shut off HFC-410A cylinder.
Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core
tool while maintaining a positive system pressure.
Replace stem caps and finger tighten them, then tighten an additional one-sixth (1/6) of a turn as illustrated.
OUTDOOR
UNIT
TO VAPOR
SERVICE VALVE
TO LIQUID LINE
SERVICE VALVE
MICRON
GAUGE
VACUUM PUMP
1/4 SAE TEE WITH SWIVEL
COUPLER
500
MANIFOLD
GAUGE SET
HFC-410A
RECOMMEND
MINIMUM 3/8” HOSE
A - Connect low side of manifold gauge set with
1/4 SAE in-line tee to vapor line service valve
B - Connect high side of manifold gauge set to
liquid line service valve
C - Connect available micron gauge connector
on the 1/4 SAE in-line tee.
D - Connect the vacuum pump (with vacuum
gauge) to the center port of the manifold
gauge set. The center port line will be used
later for both the HFC-410A and nitrogen
containers.
HIGH
LOW
1
2
3
4
5
6
7
8
9
10
11 12
1/6 TURN
NITROGEN
3CONNECT GAUGE SET
A
B
C
D
4EVACUATE THE SYSTEM
NOTE - Remove cores from service valves (if not already done).
Possible equipment damage.
Avoid deep vacuum operation. Do not use
compressors to evacuate a system.
Extremely low vacuum can cause internal
arcing and compressor failure. Damage
caused by deep vacuum operation will
void warranty.
WARNING !
EVACUATION
H - Open suction service valve first before liquid valve to release the unit charge into the system. Replace valve
caps and tighten (8 ft. lb.). Caps are the primary seal.
Evacuate the line set and indoor unit until a slight vacuum is indicated on the micron gauge (approximately 23,000 microns or
29.01 inches of mercury).
NOTE - Position
canister to deliver
liquid refrigerant.

Installation and Operation Manual - HRG18xxS1P
508133M01 Page 13 of 23Issue 2106
Electrical - Circuit Sizing and Wire Routing
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).
Refer to the furnace or air handler installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.
24VAC Transformer
Use the transformer provided with the furnace or air handler
for low-voltage control power (24VAC - 40 VA minimum).
Thermostat Control and Low Voltage
Control Wiring
Conventional 24VAC Non-Communicating
Thermostat Control
The HRG18 variable capacity unit may be installed using
a conventional 24VAC non-communicating two-stage
cooling or single-stage cooling thermostat.
The HRG18 unit will provide full variable capacity
operation when installed with a conventional 24VAC non-
communicating two stage heat pump or single-stage
heat pump thermostat. The HRG18 outdoor control has
advanced control algorithms, which provide true variable
speed capacity operation by modulating the compressor
speed to achieve the target suction pressure set point
in cooling mode, and liquid pressure set point in heating
mode.
When utilizing a two-stage conventional 24VAC non-
communicating thermostat, six wires are required to
control the outdoor unit (R, C, W1, O, Y1 and Y2). Refer to
the HRG18 eld wiring diagram for a conventional 24VAC
non-communicating 2-stage thermostat.
When utilizing a single conventional 24VAC non-
communicating thermostat, ve wires are required to
control the outdoor unit (R, C, W1, O, and Y1) and Y1 is
jumpered to Y2 in the outdoor unit. Note that the published
performance data is based upon the use of a two-stage
thermostat. Refer to the HRG18 eld wiring diagram for
a conventional 24VAC non-communicating single-stage
thermostat.
HRG18 Low Voltage Control Wiring Connections
The HRG18 variable capacity units are provided with
(2) RAST 6-Pin connections for connecting the eld low
voltage control wiring to the HRG18 harnesses in the low
voltage control make-up box. One RAST 6-pin connector is
labeled with terminals TST, DF, R, I+, I- and C. The second
RAST 6-pin connector is labeled with terminals DS, O, Y1,
Y2, L and W.
Electrical Shock Hazard!
Can cause injury or death. Unit must be
properly grounded in accordance with
national and local codes.
Line voltage is present at all components
when unit is not in operation on units
with single-pole contactors. Disconnect
all remote electric power supplies before
opening access panel. Unit may have
multiple power supplies.
WARNING
Fire Hazard. Use of aluminum wire with this product
may result in a re, causing property damage, severe
injury or death. Use copper wire only with this product.
WARNING
Failure to use properly sized wiring and circuit breaker
may result in property damage. Size wiring and circuit
breaker(s) per Technical Specications and unit rating
plate.
WARNING
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
Electrostatic discharge can a󰀨ect electronic components.
Take care during unit installation and service to protect
the unit’s electronic controls. Precautions will help to
avoid control exposure to electrostatic discharge by
putting the unit, the control and the technician at the
same electrostatic potential. Touch hand and all tools
on an unpainted unit surface before performing any
service procedure to neutralize electrostatic charge.
WARNING

Installation and Operation Manual - HRG18xxS1P
Page 14 of 23 508133M01Issue 2106
Thermostat Type Indoor Unit Type
Qty. of
Wires to
HRG18
HRG18 Terminal
Strip Connections Unit Operation Field Wiring Diagram
Conventional
24VAC 2-Stage
Cooling
Thermostat (non-
communicating)
Any Furnace or
Air Handler (non-
communicating)
6 R, C, W1, O, Y1, Y2
Full Variable Capacity Operation
Controlled by HRG18 Unitary Control
Using Suction Pressure
Figure 10
Conventional
24VAC Single-
Stage Cooling
Thermostat (non-
communicating)
Any Furnace or
Air Handler (non-
communicating)
5R, C, W1, O, Y1
(Jumper Y1 to Y2)
Full Variable Capacity Operation
Controlled by HRG18 Unitary Control
Using Suction Pressure
Figure 9
Table 4. HRG18 Thermostat Control Options
Size Circuit and Install Service Disconnect
Switch
Refer to the unit nameplate for minimum circuit ampacity,
and maximum fuse or circuit breaker (HACR per NEC).
Install power wiring and properly sized disconnect switch.
SERVICE
DISCONNECT
SWITCH
MAIN FUSE
BOX/BREAKER
PANEL
Figure 6.
NOTE: Units are approved for use only with copper
conductors. Ground unit at disconnect switch or connect
to an earth ground.
Install Thermostat
Install room thermostat (ordered separately) on an inside
wall approximately in the center of the conditioned area
and 5 feet (1.5m) from the oor. It should not be installed
on an outside wall or where it can be a󰀨ected by sunlight
or drafts.
THERMOSTAT
5 FEET
(1.5M)
Figure 7.
NOTE: 24VAC, Class II circuit connections are made in
the control panel.

Installation and Operation Manual - HRG18xxS1P
508133M01 Page 15 of 23Issue 2106
OUTDOOR UNIT
CONNECTS TO
(2) RAST 6-PIN
CONNECTORS
LOW VOLTAGE
MAKE-UP BOX
ROUTE CONTROL
WIRING THROUGH
GROMMET AND
SECURE WITH
CABLE TIE
GROMMET AND
CABLE TIE
USE WATERTIGHT
CONDUIT FOR HIGH
VOLTAGE
CONNECT CONDUIT
TO CUTOUT AND
ROUTE HIGH
VOLTAGE WIRING
Figure 8.
Route Control Wires
Wire Run Length AWG# Insulation Type
Less than 100’ (30m) 18 Temperature Rating
35°C Minimum
More than 100’ (30m) 16
Table 5. Conventional 24VAC Non-Communicating
Thermostat Wiring
Route High Voltage and Ground Wires
Any excess high voltage eld wiring should be trimmed
and secured away from any low voltage eld wiring. To
facilitate a conduit, a cutout is located on the bottom of
the control box. Connect conduit to the control box using a
proper conduit tting.
Connect the 208/230 high voltage power supply from the
disconnect to the HRG18 contactor as shown. Connect the
ground wire from the power supply to the unit ground lug
connection.

Installation and Operation Manual - HRG18xxS1P
Page 16 of 23 508133M01Issue 2106
RAST 6-PIN
CONNECTOR
RAST 6-PIN
CONNECTOR
VARIABLE CAPACITY
OUTDOOR UNIT
TWO STAGE /
VARIABLE SPEED
GAS FURNACE
CONVENTIONAL 24VAC
NON-COMMUNICATING
THERMOSTAT
W
L
Y2
Y1
O
DS
C
I+
I-
R
DF
TST
Y1
O
C
W1
R
G
TC
TO
ACC2
ACC1
Y1
O
DH
C
W2
W1
R
G
DS
W2
O.D. SENSOR
OPTIONAL
FOR SINGLE STAGE OPERATION INSTALL A JUMPER BETWEEN Y1 TO Y2 ON THE OUTDOOR UNIT
TERMINAL STRIP
FOR SINGLE STAGE OPERATION INSTALL A JUMPER BETWEEN Y1 TO Y2 ON THE OUTDOOR UNIT
TERMINAL STRIP
RAST 6-PIN
CONNECTOR
RAST 6-PIN
CONNECTOR
VARIABLE CAPACITY
OUTDOOR UNIT
SINGLE STAGE FURNACE /
PSC AIR HANDLER
CONVENTIONAL 24VAC
NON-COMMUNICATING
THERMOSTAT
W
L
Y2
Y1
O
DS
C
I+
I-
R
DF
TST
Y
O
C
W
R
G
TC
TO
ACC2
ACC1
Y1
O
DH
C
W2
W1
R
G
O.D. SENSOR
OPTIONAL
CONSTANT TORQUE /
VARIABLE SPEED
AIR HANDLER
RAST 6-PIN
CONNECTOR
RAST 6-PIN
CONNECTOR
VARIABLE CAPACITY
OUTDOOR UNIT
CONVENTIONAL 24VAC
NON-COMMUNICATING
THERMOSTAT
W
L
Y2
Y1
O
DS
C
I+
I-
R
DF
TST
Y1
O
C
W1
R
G
TC
TO
ACC2
ACC1
Y1
O
DH
C
W2
W1
R
G
DS
W2
O.D. SENSOR
OPTIONAL
FOR SINGLE STAGE OPERATION INSTALL A JUMPER BETWEEN Y1 TO Y2 ON THE OUTDOOR UNIT
TERMINAL STRIP
Figure 9. Conventional 24VAC Cooling Non-
Communicating Thermostat Wiring - Single Stage
RAST 6-PIN
CONNECTOR
RAST 6-PIN
CONNECTOR
VARIABLE CAPACITY
OUTDOOR UNIT
TWO STAGE /
VARIABLE SPEED
GAS FURNACE
CONVENTIONAL 24VAC
NON-COMMUNICATING
THERMOSTAT
W
L
Y2
Y1
O
DS
C
I+
I-
R
DF
TST
Y1
O
C
W1
R
G
TC
TO
ACC2
ACC1
R2
Y2
Y1
O
DH
C
W2
W1
R
G
DS
W2
Y2
O.D. SENSOR
OPTIONAL
RAST 6-PIN
CONNECTOR
RAST 6-PIN
CONNECTOR
VARIABLE CAPACITY
OUTDOOR UNIT
SINGLE STAGE FURNACE /
PSC AIR HANDLER
CONVENTIONAL 24VAC
NON-COMMUNICATING
THERMOSTAT
W
L
Y2
Y1
O
DS
C
I+
I-
R
DF
TST
C
W
R
G
TC
TO
ACC2
ACC1
R2
Y2
Y1
O
DH
C
W2
W1
R
G
Y
O.D. SENSOR
OPTIONAL
CONSTANT TORQUE /
VARIABLE SPEED
AIR HANDLER
RAST 6-PIN
CONNECTOR
RAST 6-PIN
CONNECTOR
VARIABLE CAPACITY
OUTDOOR UNIT
CONVENTIONAL 24VAC
NON-COMMUNICATING
THERMOSTAT
W
L
Y2
Y1
O
DS
C
I+
I-
R
DF
TST
Y1
O
C
W1
R
G
TC
TO
ACC2
ACC1
R2
Y2
Y1
O
DH
C
W2
W1
R
G
DS
W2
Y2
O.D. SENSOR
OPTIONAL
Figure 10. Conventional 24VAC Cooling Non-
Communicating Thermostat Wiring - Two Stage

Installation and Operation Manual - HRG18xxS1P
508133M01 Page 17 of 23Issue 2106
Outdoor Unitary Control
Jumpers and Terminals
RAST TERMINALS FOR
THERMOSTAT WIRING
CONNECTION
CHARGE MODE AND
OPERATION MODE
JUMPER DETAIL
PUSH BUTTON
7 SEGMENT
DISPLAY
OPERATION
MODE
JUMPER
CHARGE
MODE JUMPER
(CHRG MODE)
Figure 11.
7-Segment Display and Push Button
Information labels concerning the outdoor control
7-segment display and push button operations are
available on the unit control panel cover.
Alarms
Alarm information is provided on the unit control panel
cover.
Programing Unit Type
Programming to the appropriate tonnage allows the unit to
operate in the range of compressor and fan speeds that
are optimized for best unit performance and e󰀩ciency.
The HRG18 units are programmed from the factory to
function in 3 Ton and 5 Ton modes of operation. If the
intended capacity for the application is 3 or 5 Ton, skip this
section.
The units are eld convertible to 2 Ton or 4 Ton to e󰀩ciently
perform for the required application. If the intended capacity
is 2 or 4 Ton, proceed to the following steps to program the
unit type. Outdoor unit must be powered ON and in idle
mode (no heating or cooling mode of operation).
NOTE: The -36 unit can be programmed to operate as a
2 Ton, and the -60 unit can be programmed to operate as
a 4 Ton.
Perform the following steps to program the unit type.
1. To enter mode options, push and hold the push button
next to the seven-segment display until a DASH (-)
symbol appears. Immediately release the button. Once
the dash starts blinking, proceed to the next step.
_
2. Push and hold button again until PU is displayed on
the seven-segment display. Immediately release the
button.
PU
3. Push and hold button until the code for the correct unit
type is displayed.
Unit Code Unit Type
58 2 Ton
60 3 Ton
62 4 Ton
63 5 Ton
Table 6. Unit Tonnage Codes

Installation and Operation Manual - HRG18xxS1P
Page 18 of 23 508133M01Issue 2106
4. The unit will display the unit type for 10 seconds. Press
the push button and hold it for 3 seconds for the unit
to store the unit type. Once, the unit code is stored
the system acknowledges by displaying a string of
characters ending with the updated system unit code.
After programming of unit type is complete, the unit can be
set up for charge mode operation.
Charge Mode Jumper
To initiate the HRG18 Charge Mode function, install the
jumper across the two Charge Mode Pins (CHRG MODE)
on the outdoor control. The Charge Mode can be used
when charging the system with refrigerant, checking
the refrigerant charge, pumping down the system and
performing other service procedures that requires outdoor
unit operation at 100% capacity.
HRG18 Charge Mode Operation with a Conventional
24VAC Non-Communicating Heat Pump Thermostat
Charge Mode Jumper Operation in the Cooling Mode
On applications with a conventional 24VAC non-
communicating heat pump thermostat, the charge mode
jumper must be installed on the Charge Mode Pins after
providing a cooling compressor demand to the HRG18
and an “O” cooling reversing valve demand to initiate the
Charge Mode. A cooling blower demand must also be
provided to initiate blower in high stage operation on the
indoor unit.
The compressor and outdoor fan motor will begin to ramp
up and reach 100% design capacity within 3 minutes. They
will continue to operate at 100% design capacity for the
duration of charge mode.
Charge Mode Jumper Operation in the Heat Pump
Heating Mode
On applications with a conventional 24VAC non-
communicating heat pump thermostat, the charge mode
jumper must be installed on the Charge Mode Pins after
providing a heating compressor demand to the HRG18
without an “O” reversing valve signal to initiate the Charge
Mode. A heating blower demand must also be provided to
initiate high speed blower operation on the indoor unit.
The compressor and outdoor fan motor will begin to ramp
up and reach 100% design capacity within 3 minutes. They
will continue to operate at 100% design capacity for the
duration of charge mode.
Exiting Charge Mode
To exit the charging mode, remove the Charge Mode
Jumper from the Charge Mode Pins. The system will
be in Charge Mode for a maximum time of 60 minutes
and will automatically exit the charge mode and resume
normal operation after 60 minutes even if the charge mode
jumper is left in place. To extend the charge mode beyond
Start-Up
If unit is equipped with a crankcase heater, it should
be energized 24 hours before unit start-up to prevent
compressor damage as a result of slugging.
CAUTION
1. Rotate fan to check for frozen bearings or binding.
2. Inspect all factory and eld-installed wiring for loose
connections.
3. After evacuation is complete, open liquid line and
suction line service valves to release refrigerant
charge (contained in outdoor unit) into system.
4. Replace the stem caps and secure nger tight, then
tighten an additional 1/6 of a turn.
5. Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit
nameplate. If not, do not start equipment until the
power company has been consulted and the voltage
condition corrected.
6. Set thermostat for cooling demand, turn on power to
indoor blower, and close the outdoor unit disconnect
switch to start the unit.
7. Recheck unit voltage with unit running. Power must be
within range shown on unit nameplate.
Refrigerant Charging
Excessive amounts of liquid refrigerant entering the
suction line can damage the compressor. When adding
refrigerant, precautions must be taken to control the
ow of liquid into the system. This can be done by using
a liquid vaporizing adapter or manual control using a
sight glass as indicator.
CAUTION
Units are factory charged with the amount of R-410A
refrigerant indicated on the unit rating plate. This charge is
based on a matching indoor coil and outdoor coil with 15’
line set. For varying lengths of line set, refer to Table 7 for
refrigerant charge adjustment. A blank space is provided
on the unit rating plate to list the actual eld charge.
60 minutes, ensure the cooling/heating demand, blower
demand and appropriate reversing valve demand are
available and reapply the charge mode jumper.
NOTE: If compressor demand is lost during charge mode
period, then the compressor and fan will cease to operate,
and the unit will enter into a delay timer for 3 minutes.
Repeat the charging mode procedure to get back into
charge mode.

Installation and Operation Manual - HRG18xxS1P
508133M01 Page 19 of 23Issue 2106
Table 7. Refrigerant Charge Adjustment
Liquid Line Set Diameter Oz. Per 5 ft. adjust from 15
ft. line set*
3/8 in. 3 oz. per 5 ft.
or 0.6 oz. per 1 ft.
* If line length is greater than 15 ft., add this amount. If line
length is less than 15 ft., remove this amount.
Mineral oils are not compatible with R-410A. If oil must
be added, it must be a polyolester oil.
IMPORTANT
NOTE: Both airow and refrigerant charge must be
monitored for proper system set-up. It may be necessary to
alternately check and adjust the airow and the refrigerant
charge.
If the system is void of refrigerant, or if the outdoor ambient
temperature is cool, use the weigh-in method to charge the
unit. Do this after any leaks have been repaired.
1. Recover the refrigerant from the unit.
2. Conduct a leak check, then evacuate as previously
outlined.
3. Weigh in the charge according to the total amount
shown on the unit nameplate.
If weighing facilities are not available or if unit is being
charged during warm weather, use one of the following
procedures.
• For systems using a TXV on the indoor evaporator
and outdoor temperature above 60°F – charge in
cooling mode using the subcooling method and table
provided on the unit access panel.
• For systems below 60°F – charge in heating mode
using the subcooling method and table provided on
the unit access panel. Attach low pressure gauge
hose to auxiliary service port to access suction side in
heating mode.
NOTE: All unit table values are based on 70 to 80°F
indoor return air temperature for cooling mode, and
65°F to 75°F return air temperature for heat mode.
High Pressure Switch
This unit is equipped with a high pressure switch which
is located on the liquid line. The SPST, normally closed
pressure switch opens when liquid line pressure rises above
the factory setting of 590 +/- 15 psig and automatically
resets at 418 +/- 15 psig.
Torque Requirements
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. Table 8 shows
torque values for fasteners.
Fastener Torque
Valve Stems 4 in. lbs.
Stem Caps 8 ft. lbs.
Service Port Caps 8 ft. lbs.
Sheet Metal Screws 16 in. lbs.
#8 Machine Screws 16 in. lbs.
#10 Machine Screws 28 in. lbs.
Compressor Bolts 90 in. lbs.
Table 8. Torque Table
Liquid and Suction Line Service Valves
The liquid line and suction line service valves (see Figure
12) and service ports are used for leak testing, evacuation,
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.
Figure 12.
To Access the Schrader Port:
1. Remove the service port cap with an adjustable
wrench.

Installation and Operation Manual - HRG18xxS1P
Page 20 of 23 508133M01Issue 2106
2. Connect gauge to the service port.
3. When testing is completed, replace service port cap.
Tighten nger tight, then an additional 1/6 turn.
To Open Liquid or Suction Line Service Valve:
1. Remove stem cap with an adjustable wrench.
2. Use service wrench with a hex-head extension to back
the stem out counterclockwise as far as it will go. Use a
3/16” hex head extension for liquid line service valves
and a 5/16” extension for suction line service valves.
3. Replace the stem cap. Tighten nger tight, then tighten
an additional 1/6 turn.
To Close Liquid or Suction Line Service Valve:
1. Remove the stem cap with an adjustable wrench.
2. Use a service wrench with a hex-head extension to
turn the stem clockwise to seat the valve. Tighten
rmly.
3. Replace the stem cap. Tighten nger tight, then tighten
an additional 1/6 turn.
Suction Line (Ball Type) Service Valve
Suction line (ball type) service valves function the same
way as the other valves; the di󰀨erence is in the construction
(see Figure 13).
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 serves as the
primary seal.
Figure 13.
Maintenance
Regular Maintenance Requirements
Your system should be regularly inspected by a qualied
service technician. These regular visits may include
(among other things) checks for:
• Motor operation
• Ductwork air leaks
• Coil & drain pan cleanliness (indoor & outdoor)
• Electrical component operation & wiring check
• Proper refrigerant level & refrigerant leaks
• Proper airow
• Drainage of condensate
• Air lter(s) performance
• Blower wheel alignment, balance & cleaning
• Primary & secondary drain line cleanliness
• Proper defrost operation (heat pumps)
Air Filter
Inspect air lters at least monthly and replace or clean as
required. Disposable lters should be replaced. Washable
lters may be cleaned by soaking in mild detergent and
rinsing with cold water. Allow lter to dry before reinstalling.
Replace lters with the arrows pointing in the direction of
airow. Dirty lters are the most common cause of poor
heating / cooling performance and compressor failures.
Indoor Coil
If the system has been operated with a clean lter in place,
it should require minimal cleaning. If cleaning is needed,
call your dealer for service.
Condensate Drain
During cooling season check at least monthly for free ow
of drainage and clean if necessary.
Outdoor Unit
Grass cuttings, leaves, dirt, dust, lint from clothes dryers,
and foliage from trees can be drawn into coils by movement
of the air. Clogged condenser coils will lower the e󰀩ciency
of your unit and could cause damage to the condenser and
compressor.
Periodically, debris should be brushed from the condenser
coils. Use a soft bristle brush with light pressure only. DO
NOT damage or bend condenser coil ns. Damaged or
bent ns may a󰀨ect unit operation.