Comfortaire HRG14 Installation manual

Page 1 of 16507710-01 Issue 1148
NOTE:
These instructions are intended as a general guide and do
not supersede national, state or local codes in any way.
INSTALLATION / START-UP INSTRUCTIONS
HRG14 SPLIT SYSTEM HEAT PUMP
HOMEOWNERS INFORMATION MANUAL
These instructions must be read and understood completely before attempting installation.
Improper installation, adjustment, alteration, service
or maintenance will void the warranty. The qualied
installer or agency must use factory-authorized kits
or accessories when added to this products. Refer
to the individual instructions included with the specic
accessory kit.
CAUTION
Installation or repairs made by unqualied persons can
result in hazards to you and others. Installation MUST
conform with local building codes and with the National
Electrical Code NFPA 70/ANSI C1-1993 or current
edition and Canadian Electrical Code Part 1 CSA C22.1.
WARNING
Manufactured By
Comfort-Aire / Century
1900 Wellworth Ave.
Jackson, MI 49203
*P507710-01*
(P) 507710-01
These instructions must be left with the property owner.
SAFETY PRECAUTIONS......................................................................2
UNIT LOCATION & INSTALLATION......................................................2
ROOFTOP INSTALLATION & RECOMMENDATIONS ......................... 3
CLEARANCE REQUIREMENTS...........................................................3
REFRIGERATION LINE SETS..............................................................3
INSTALLATION OF LINE SETS ............................................................4
LEAK CHECK........................................................................................4
EVACUATING & CHARGING................................................................4
OPENING SERVICE VALVE .................................................................4
TABLE OF CONTENTS
ELECTRICAL CONNECTIONS............................................................ 5
CONTROL WIRING.............................................................................. 5
START-UP PROCEDURE .................................................................... 6
ADJUSTING CHARGE......................................................................... 6
SYSTEM OPERATIONS ...................................................................... 7
DEFROST SYSTEM (Time -Temp) ...................................................... 7
DEFROST SYSTEM (Demand Defrost)............................................... 8
SINGLE PHASE WIRING DIAGRAM (14 SEER)................................14
HOMEOWNER’S INFORMATION.......................................................15
These units are designed for use in residential and
light commercial type buildings. Heat Pumps may only
be installed with indoor combinations listed in the Air
Conditioning, Heating and Refrigeration Institute (AHRI)
Directory of Certied Products.
Inspect the unit for any damage before installation. If
damage is found, notify the transportation company
immediately and le a concealed damage claim.

507710-01Page 2 of 16 Issue 1148
NOTE TO INSTALLING DEALER
These instructions and warranty are to be given to the owner
or displayed near the indoor air handler unit.
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.
UNIT LOCATION & INSTALLATION
NOTE: In some cases noise in the living area has been
traced to gas pulsations from improper installation of
equipment.
1. Locate unit away form windows, patios, decks, etc.
where unit operation sounds may disturb customer.
2. Ensure that vapor and liquid tube diameters are
appropriate to capacity of unit.
3. Run refrigerant tubes as directly as possible by
avoiding unnecessary turns and bends.
4. Leave some slack between structure and unit to absorb
vibration.
5. When passing refrigerant tubes through the wall, seal
opening with RTV or other silicon-based caulk.
6. Avoid direct tubing contact with water pipes, duct work,
oor joists, wall studs, oors, walls, and any structure.
7. Do not suspend refrigerant tubing from joists and studs
with a rigid wire or strap which comes in direct contact
with tubing.
8. Ensure that tubing insulation is pliable and completely
surrounds vapor tube.
When outdoor unit is connected to factory-approved indoor
unit, outdoor unit contains system refrigerant charge for
operation with indoor unit of the same size when connected
by 15 ft. of eld-supplied tubing. For proper unit operation,
check refrigerant charge using charging information located
on control box cover.
IMPORTANT: Maximum liquid-line size is 3/8 in. O.D. for
all residential applications including long lines.
Outdoor Section
Zoning ordinances may govern the minimum distance the
condensing unit can be installed from the property line.
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.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch. Lock out
and tag switch with a suitable warning label. Electrical
shock can cause personal injury or death.
WARNING
WARNING
This product and/or the indoor unit that is matched with
may contain berglass wool.
Disturbing the insulation during installation, maintenance,
or repair will expose you to fiberglass wool dust.
(Fiberglass wool is known to the State of California to
cause cancer.)
Fiberglass wool may also cause respiratory, skin, and
eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from your distributor.

Page 3 of 16507710-01 Issue 1148
Elevate Unit
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.
Roof Top Installations
Mount on level platform or frame 6 inches above roof
surface. Place unit above a load-bearing wall and isolate unit
and tubing set from structure. Arrange supporting members
to adequately support unit and minimize transmission of
vibration to building. Ensure roof structure and anchoring
method is adequate for location. Consult local codes
governing rooftop applications.
Roof mounted units exposed to winds above 5 mph may
require wind bafes to achieve adequate defrost. A sheet
metal bafe should be spaced 6-1/2” from the fall of the coil.
The height should cover the face of the coil and the length
should be 6” from the access panel.
NOTE: Unit must be level to within ± 2 (± 3/8 in./ft) per
compressor manufacturer specications.
Clearance Requirements
When installing, allow sufcient space for airow clearance,
wiring, refrigerant piping, and service. For proper airow,
quiet operation and maximum efciency. Position so water,
snow, or ice from roof or eaves cannot fall directly on unit.
DO LOCATE THE UNIT:
• With proper clearances on sides and top of unit
• On a solid, level foundation or pad
• 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.
Refrigeration Line Sets
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).
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.
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.
Recommended Liquid & Vapor Tube Diameters (In.)
Unit
Size
LIQUID VAPOR
Connections Dia. Connections Dia.Tube Dia. Tube Dia.
018
024
030
036
042
048
060
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/4”
3/4”
3/4”
3/4”
3/4”
3/4”
*1-1/8
7/8”
7/8”
7/8”
7/8”
7/8”
7/8”
7/8”
* FIELD SUPPLIED 7/8 X 1-1/8 CONNECTOR REQUIRED ON BOTH ENDS OF VAPOR TUBING.
CAUTION
Accumulation of water and ice in base pan may cause
equipment damage.

507710-01Page 4 of 16 Issue 1148
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. Long 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.
Before making braze connections, be sure all joints are
clean. Before heat is applied for brazing, dry nitrogen should
be owing through the tubing to prevent oxidation and scale
formation on the inside of the tubing.
The following is the recommended method for making braze
connections at the refrigerant line connections:
1. Debur and clean refrigerant tube end with emery cloth
or steel brush.
2. Insert tubing into swage tting connection.
3. Wrap wet rags over valves to protect from heat.
4. Allow dry nitrogen to ow through refrigerant lines.
5. Braze joint, using a suitable brazing alloy for copper to
copper joints.
6. Quench the joint and tubing with water using a wet rag.
Leave rag on tting body and re-wet with water to help
cool area.
Leak Check
Refrigeration lines and indoor coil must be checked for leaks
after brazing and before evacuation. The recommended
procedure is to apply a trace amount of vapor refrigerant
(approximately two ounces or 3 psig) into the line set and
indoor coil, then pressurize with 150 psig of dry nitrogen.
Use a refrigerant leak detector to check all joints. The
system may also be checked for leaks using a halide torch
or pressure and soapy solution. After completion of leak
check, relieve all pressure from system before evacuation.
Evacuating And Charging Instructions
NOTE: Intentional release of CFC or HCFC refrigerant
to the atmosphere violates Federal Law. It may also
violate State and Local Codes. Check all Federal, State
and Local Codes before proceeding.
These outdoor units are pre-charged at the factory with
adequate refrigerant to handle 15 feet of refrigerant tubing.
NOTE: DO NOT use any portion of the charge for purging
or leak testing. It is mandatory that a thorough evacuation
of the refrigeration lines and indoor coil be performed.
The liquid line and suction line service valves have been
closed after nal testing at the factory. DO NOT disturb
these valves until the lines have been leak checked and
evacuated or the charge in the unit may be lost.
1. Connect the vacuum pump to the center hose of the
manifold gauge set, the low-pressure manifold gauge to
the vapor service valve and the high pressure manifold
gauge to the liquid service valve.
NOTE: Unnecessary switching of hoses can be avoided
and complete evacuation of all lines can be achieved by
also connecting a branch hose from the manifold gauge
center port to a cylinder of the proper refrigerant. Provide
a separate shut-off valve to vacuum pump to avoid
contaminating vacuum pump oil with refrigerant.
2. The valves should be kept in the “front seated” (closed)
position. This will allow evacuation of the refrigeration
lines and the indoor coil, without disturbing the factory
charge in the outdoor unit.
3. Follow the vacuum pump manufacturer’s instructions.
Allow the pump to operate until the system has been
evacuated down to 300 microns. Allow the pump to
continue running for an additional 15 minutes. Turn OFF
the pump and leave the connections secured to the two
(2) service valves. After 5 minutes, if the system fails
to hold 500 microns or less, check all connections for
tight t and repeat the evacuation procedure.
4. Isolate the vacuum pump from the system by closing
the shutoff valves on the gauge-set. Disconnect the
vacuum pump.
Opening Service Valves
After evacuation of the connecting lines, remove the service
valve cap and fully insert the hex wrench into the stem. A
back-up wrench is required on the valve body to open the
valve stem. Back-out counterclockwise until the valve stem
just touches the coined edge.
Wrench sizes:
3/8 service valve: 3/16” Hex wrench
3/4 service valve: 5/16” Hex wrench
7/8 service valve: 5/16” Hex wrench
If ANY refrigerant tubing is buried, provide a 6 inch
vertical rise at service valve. Refrigerant tubing lengths
up to 36 inches may be buried without further special
consideration. For lengths above 36 inches, consult your
local distributor.
CAUTION

Page 5 of 16507710-01 Issue 1148
Replace service valve cap and torque to 8-11 ft-lb on 3/8”
valves; 12-15 ft-lb on 3/4” valves; 15-20 ft-lb on 7/8” valves.
Use backup wrench on valve body when torqueing valve cap.
Install Electrical Accessories
Refer to the instructions packaged with the accessories.
Electrical Connections
Be sure to check all local codes to determine that the unit
is installed accordance with local requirements. Consult
the National Electric Code for wire size requirements. Use
60 C wire or higher. Always provide ground connections to
the outdoor unit. Power supply must agree with rating on
unit nameplate.
Provide line voltage power supply to unit from a properly
sized disconnect switch. Route power and ground wires
from disconnect switch to unit. Line voltage connections
are made at the line side of the contactor in the control box
of the outdoor unit. Follow the appropriate wiring diagram
attached to inside of the access panel.
Proper circuit protection recommendations are indicated on
Unit Rating Plate. Time delay fuses are required to prevent
blowing due to starting current (the current in rush when
equipment starts is referred to as the Locked Rotor Amps or
(LRA). A fuse of this kind properly sized will give maximum
equipment protection.
Use copper wire only between disconnect switch and unit.
Remove access panel to gain access to unit wiring. Extend
wires from disconnect through power wiring hole provided
and into unit control box. Flexible conduit is required for the
swing out control box feature.
Connect ground wire to ground connection in control box
for safety. Connect power wiring to contactor.
High voltage power connections to 3-phase models is made
to “Pig Tail” leads with eld supplied splice connectors.
Control Wiring
The control voltage is 24 Vac. NEC Class I insulated 18
AWG is required for control wiring. For lengths longer than
150 feet, contact your local distributor for technical service.
Ensure the room thermostat is properly installed per
instructions shipped with room thermostat. Generally the
thermostat should not be exposed to sunlight, drafts or
vibration and should not be mounted on exterior walls.
Low voltage control wire connections should be made to the
screw connection terminal board mounted on the defrost
control as shown. All low voltage control wiring must be
separated from incoming power leads.
WARNING
ELECTRICAL SHOCK HAZARD!
Turn OFF electric power before connecting unit,
performing any maintenance or removing panels or
doors. More than one disconnect may be required to
turn off all power.
FAILURE TO DO SO COULD RESULT IN BODILY
INJURY OR DEATH.
WARNING
The unit cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault
should occur. The ground may consist of electrical
wire or metal conduit when installed in accordance with
existing electrical codes. Failure to follow this warning
can result in an electric shock, re, or death.