Reznor JT4BD User Manual

Outdoor Heat Pump

User’s Information/Installation Instructions

13 SEER R-410A High Effi ciency Split System

These units have been designed and tested for capacity and effi ciency in accordance with A.R.I.
Standards. Split System Heat Pump units are designed for use with a wide variety of fossil fuel
furnaces, electric furnaces, air handlers, and evaporator coil combinations.

These instructions are primarily intended to assist qualifi ed individuals experienced in the proper
installation of heating and/or air conditioning appliances. Some local codes require licensed instal­lation/service personnel for this type of equipment. Read all instructions carefully before starting
the installation.

USER’S INFORMATION

IMPORTANT

Read this owner information to become familiar with the capabilities and use of your appliance.
Keep this with literature on other appliances where you have easy access to it in the future. If a
problem occurs, check the instructions and follow recommendations given. If these suggestions
don’t eliminate your problem, call your servicing contractor.

Heat Pump Principle of Operation

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WINTER HEATING

1. Outdoor air enters heat pump.

2. Cold, heat-transfer section (outdoor coil)
extracts heat from outdoor air as refrigerant
evaporates from a liquid to a gas.

3. Refrigerant, compressed to a hot gas by
heat pump, carries the heat to the hot heat­transfer section (indoor coil).

4. Hot, heat-transfer section (indoor coil)
releases the heat to indoor air as refrigerant
condenses from a gas to a liquid.

5. Air handler circulates the heat throughout
the home.

6. Refrigerant returns to outdoor coil and
evaporates once again to absorb more
heat.

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4

3

6

2

SUMMER COOLING

1. Indoor air enters the air handler section.

2. Cold, heat-transfer section (indoor coil)
extracts heat from indoor air as refrigerant
evaporates from a liquid to a cold gas.

3. Refrigerant, drawn to heat pump and
compressed to a hot gas by heat pump,
carries the heat outdoors.

4. Hot, heat-transfer section (outdoor coil)
releases the heat as refrigerant condenses
from a gas to a liquid.

5. Heat pump (outdoor fan) discharges the
heat to outside air.

6. Refrigerant returns to indoor coil and
evaporates once again to absorb more
heat.

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OPERATING INSTRUCTIONS

TO OPERATE YOUR HEAT PUMP
FOR COOLING —

1. Set the thermostat system switch to COOL
and the thermostat fan switch to AUTO. (See

Figure 1)

2. Set the thermostat temperature to the
desired temperature level using the
temperature selector. Please refer to
the separate detailed thermostat user’s
manual for complete instructions regarding
thermostat programming. The outdoor unit
and indoor blower will both cycle on and
off to maintain the indoor temperature at
the desired heating level.

2. Set the thermostat temperature to the
desired temperature level using the tem­perature selector. Please refer to the sepa­rate detailed thermostat user’s manual for
complete instructions regarding thermostat
programming. The outdoor unit and indoor
blower will both cycle on and off to maintain
the indoor temperature at the desired cool­ing level.

NOTE: If the thermostat temperature level

is re-adjusted, or the thermostat system
switch is repositioned, the outdoor unit
may not start immediately. The outdoor unit
contains a protective timer circuit which
holds the unit off for approximately fi ve
minutes following a previous operation,
or the interruption of the main electrical

power.

TO OPERATE YOUR HEAT PUMP
FOR HEATING —

1. Set the thermostat system switch to HEAT
and the thermostat fan switch to AUTO.

(See Figure 1)

NOTE: If the thermostat temperature level

is re-adjusted, or the thermostat system
switch is repositioned, the outdoor unit
may not start immediately. The outdoor unit
contains a protective timer circuit which
holds the unit off for approximately fi ve
minutes following a previous operation,
or the interruption of the main electrical
power.

Emergency Heat:

The thermostat includes a system switch

position termed EM. HT. This is a back-up
heating mode to be used only if there is
a suspected problem with the outdoor
unit. With the system switch set to EM.
HT. the outdoor unit will be locked off,
and supplemental heat (typically electric
resistance heating) will be used as a source
of heat. Sustained use of electric resistance
heat in place of the heat pump will result
in an increase in electric utility costs.

Defrost:

During cold weather heating operation,

the outdoor unit will develop a coating

Figure 1. Typical Thermostat

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of snow and ice on the heat transfer coil.
This is normal, and the unit will periodically
defrost itself. During the defrost cycle, the
outdoor fan will stop, and the compressor
will continue to run and heat the outdoor coil,
causing the snow and ice to melt. After the
snow and ice have melted, some steam may
rise from the outdoor unit as the warm coil
causes some melted frost to evaporate.

TO OPERATE YOUR HEAT PUMP
FOR AUTOMATIC COOLING AND

HEATING —

1. Set the thermostat system switch to AUTO
and the thermostat fan switch to AUTO. (See

Figure 1)

Note: Thermostats will vary. Some models

will not include the AUTO mode, and others
will have the AUTO in place of the HEAT and
COOL, and some will include all three.

2. Set the thermostat temperature to the
desired heating and cooling temperature
level(s). The outdoor unit and the indoor
blower will then cycle on and off in either
the heating or cooling mode of operation
as required to automatically maintain the
indoor temperature within the desired
limits.

equalize a temperature unbalance due to a sun
load, cooking, or fi replace operation.

TO MAINTAIN YOUR HEAT PUMP —

CAUTION:

Be certain the electrical power to
the outdoor unit and the furnace/air
handler is disconnected before
doing the following recommended
maintenance.

1. Regularly:

a. Clean or replace the indoor air fi lter at the

start of each heating and cooling season,
and when an accumulation of dust and dirt
is visible on the air fi lter. Inspect the fi lter
monthly.

b. Remove any leaves and grass clippings from

the coil in the outdoor unit, being careful
not to damage the aluminum fi ns.

c. Check for any obstruction such as twigs,

sticks, etc.

CAUTION:

TO SHUT OFF YOUR HEAT PUMP —

Set the thermostat system switch to OFF and
the thermostat fan switch to AUTO. (See Figure

1) The system will not operate, regardless of the
thermostat temperature selector(s) setting.

TO OPERATE THE INDOOR
BLOWER CONTINUOUSLY —

Set the thermostat fan switch to ON (See Figure

1). The indoor blower will start immediately, and

will run continually until the fan switch is reset
to AUTO.

The continuous indoor blower operation can be
obtained with the thermostat system switch set
in any position, including OFF.

The continuous indoor blower operation is
typically used to circulate the indoor air to

Do not over-oil, or oil motors not
factory-equipped with oil tubes. The
compressor is hermetically “sealed”
and does not require lubrication.

2. Before Calling a Service Technician, Be
Certain:

a. The unit thermostat is properly set — see

“To Operate Your Heat Pump for Cooling”
and “To Operate Your Heat Pump for
Heating.”

b. The unit disconnect fuses are in good

condition, and the electrical power to the
unit is turned on.

Read Your Warranty

Please read the separate warranty document
completely. It contains valuable information
about your system.

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GENERAL INFORMATION

SAFETY CONSIDERATIONS

Read the following instructions completely before
performing the installation.

CAUTION:

This unit uses refrigerant R-410A. DO
NOT under any circumstances use
any other refrigerant besides R-410A
in this unit. Use of another refrigerant
will damage this unit.

Outdoor Unit Section — Each outdoor unit

is shipped with a refrigerant charge adequate
to operate the outdoor section with an indoor
matching coil or air handler. Units with braze
connections include the proper amount of
refrigerant for an additional 15 ft. of refrigerant
lines the same size as the valve fi ttings.

NOTE: DO NOT USE ANY PORTION OF
THE CHARGE FOR PURGING OR LEAK
TESTING.

Pressures within the System — Split
system heat pump equipment contains liquid
and gaseous refrigerant under pressure.
Installation and servicing of this equipment
should be accomplished by qualifi ed, trained
personnel thoroughly familiar with this type of
equipment. Under no circumstances should the
Homeowner attempt to install and/or service
the equipment.

Labels, Tags, Precautions — When working
with this equipment, follow all precautions in the
literature, on tags, and on labels provided with
the equipment. Read and thoroughly understand
the instructions provided with the equipment prior
to performing the installation and operational
checkout of the equipment.

Brazing Operations — Installation of equipment
may require brazing operations. Safety codes
must be complied with. Safety equipment (e.g.;
safety glasses, work gloves, fi re extinguisher,
etc.) must be used when performing brazing
operations.

Matching coils and air handlers may be shipped
with a small holding charge to pressurize them to
keep out contaminants. To release the pressure,
read the indoor section installation instructions
carefully.

Liquid and Suction Lines — Fully annealed,
refrigerant grade copper tubing should be used
when installing the system. Refrigerant suction
line tubing should be fully insulated.

Field Connections for Electrical Power
Supply — All wiring must comply with current

provisions of the “National Electrical Code”
(ANSI/NFPA 70) and with applicable local
codes having jurisdiction. The minimum size of
electrical conductors and circuit protection must
be in compliance with information listed on the
outdoor unit data label.

NOTICE:

Certain models have external panels fabricated
from a premium grade of stainless steel designed
to inhibit corrosion. For such units, if the unit is
located in a coastal region or other area subjected
to high concentrations of salt, then the unit should
be hosed off after stroms and monthly otherwise
to maintain its new appearance.

WARNING:

Ensure all electrical power to the unit
is off prior to installing or servicing
the equipment. Failure to do so may
cause personal injury or death.

SITE PREPARATION

Unpacking Equipment — Remove the

cardboard carton and User’s Manual from the
equipment. Take care to not damage tubing
connections when removing from the carton.

Inspect for Damage — Inspect the equipment
for damage prior to installing the equipment at
the job site. Ensure coil fi ns are straight and, if
necessary, comb fi ns to remove fl attened and
bent fi ns.

Preferred Location of the Outdoor Unit at the
Job Site — Conduct a survey of the job site to

determine the optimum location for mounting
the outdoor unit. Overhead obstructions,
poorly ventilated areas, and areas subject to
accumulation of debris should be avoided. The

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outdoor unit must be installed in such a manner
that airfl ow through the coil is not obstructed and
that the unit can be serviced.

Facility Prerequisites — Electrical power
supplied must be adequate for proper operation
of the equipment. The system must be wired and
provided with circuit protection in accordance
with local building codes and the National
Electrical Code.

INSTALLING THE OUTDOOR UNIT

Slab Mount — The site selected for a slab mount

installation requires a stable foundation and one
not subject to erosion. The slab should be level
and anchored (if necessary) prior to placing the
equipment on the slab.

Cantilever Mount — The cantilever mount
should be designed with adequate safety factor
to support the weight of the equipment, and for
loads subjected to the mount during operation.
Installed equipment should be adequately
secured to the cantilever mount and levelled
prior to operation of the equipment.

General — Once outdoor and indoor unit
placement has been determined, route refrigerant
tubing between the equipment in accordance with
sound installation practices. Refrigerant tubing
should be routed in a manner that minimizes the
length of tubing and the number of bends in the
tubing. Refrigerant tubing should be supported
in a manner that the tubing will not vibrate or
abrade during system operation. Tubing should
be kept clean of foreign debris during installation
and installation of a liquid line fi lter drier is
recommended if cleanliness or adequacy of
system evacuation is unknown or compromised.
Every effort should be made by the installer
to ensure that the fi eld installed, refrigerant
containing components of the system have been
installed in accordance with these instructions
and sound installation practices so as to insure
reliable system operation and longevity.

The maximum recommended interconnecting
refrigerant line length is 75 feet, and the
vertical elevation difference between the indoor
and outdoor sections should not exceed 20
feet. Consult long line application guide for
installations in excess of these limits.

Roof Mount — The method of mounting should
be designed so as not to overload roof structures
nor transmit noise to the interior of the structure.
Refrigerant and electrical line should be routed
through suitably waterproofed openings to
prevent water leaking into the structure.

INSTALLING THE INDOOR UNIT

The indoor section should be installed before
proceeding with routing of refrigerant piping.
Consult the Installation Instructions of the indoor
unit (i.e.: air handler, furnace, etc.) for details
regarding installation.

CONNECTING REFRIGERANT
TUBING BETWEEN THE INDOOR
AND OUTDOOR UNIT

CAUTION:

This system utilizes R-410A refrigerant
with POE oil. When servicing, cover
or seal openings to minimize the
exposure of the refrigerant system
to air to prevent accumulation of
moisture and other contaminants.

Filter Dryer Installation — A fi lter dryer is

provided with the unit and must be installed in the
liquid line of the system. If the installation replaces
a system with a fi lter dryer already present in the
liquid line, the fi lter dryer must be replaced with
the one supplied with the unit. The fi lter dryer
must be installed in strict accordance with the
manufacturer’s installation instructions.

Optional Equipment — Optional equipment
(e.g.: liquid line solenoid valves, etc.) should
be installed in strict accordance with the
manufacturer’s installation instructions.

ELECTRICAL CONNECTIONS

WARNING:

Turn off all electrical power at the main
circuit box before wiring electrical
power to the outdoor unit. Failure to
comply may cause severe personnel
injury or death.

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Wiring Diagram/Schematic — A wiring
diagram/schematic is located on the inside cover
of the electrical box of the outdoor unit. The
installer should become familiar with the wiring
diagram/schematic before making any electrical
connections to the outdoor unit.

Outdoor Unit Connections — The outdoor
unit requires both power and control circuit
electrical connections. Refer to the unit wiring
diagram/schematic for identifi cation and location
of outdoor unit fi eld wiring interfaces.

Control Circuit Wiring — The outdoor unit is
designed to operate from a 24 VAC Class II control
circuit. Control circuit wiring must comply with
the current provisions of the “National Electrical
Code” (ANSI/NFPA 70) and with applicable local
codes having jurisdiction.

Thermostat connections should be made in
accordance with the instructions supplied with
the thermostat, and with the instructions supplied
with the indoor equipment. A typical residential
installation with a heat pump thermostat and air
handler are shown below.

Maximum Fuse/Circuit Breaker Size — Circuit
protection for the outdoor unit must be compatible
with the maximum fuse/circuit breaker size listed
on the outdoor unit data label.

Disconnect Switch — An electrically compatible
disconnect switch must be within line of sight of
the outdoor unit. This switch shall be capable of
electrically de-energizing the outdoor unit.

Optional Equipment — Optional equipment
requiring connection to the power or control
circuits must be wired in strict accordance with
current provisions of the “National Electrical
Code” (ANSI/NFPA 70), with applicable local
codes having jurisdiction, and the installation
instructions provided with the equipment.
Optional Equipment (e.g.: liquid line solenoid
valves, hard start kits, low suction pressure
cutout switch kit, high pressure cutout switch kit,
refrigerant compressor crankcase heater, etc.)
should be installed in strict accordance with the
manufacturer’s installation instructions.

STARTUP AND CHECKOUT

Electrical Power Wiring — Electrical power

wiring must comply with the current provisions
of the “National Electrical Code” (ANSI/NFPA

70) and with applicable local codes having
jurisdiction. Use of rain tight conduit is
recommended. Electrical conductors shall have
minimum circuit ampacity in compliance with the
outdoor unit rating label. The facility shall employ
electrical circuit protection at a current rating no
greater than that indicated on the outdoor unit
rating label. Refer to the unit wiring diagram for
connection details.

Minimum Circuit Ampacity — Electrical wiring
to the equipment must be compatible and in
compliance with the minimum circuit ampacity
listed on the outdoor unit data label.

COPPER WIRE SIZE — AWG

(1% Voltage Drop)

Supply Wire Length-Feet Supply Circuit

200 150 100 50 Ampacity

6 8 10 14 15
46812 20
46810 25
44610 30
3468 35
3468 40
2346 45
2346 50

WARNING:

Ensure electrical power to the unit is
off prior to performing the following
steps. Failure to do so may cause
personal injury or death.

Air Filters — Ensure air fi lters are clean and in

place prior to operating the equipment.

Thermostat — Set the room thermostat function
switch to OFF, fan switch to AUTO, and adjust the
temperature setpoint to its highest setting.

Prior to applying electrical power to the outdoor
unit, ensure that the unit has been properly and
securely grounded, and that power supply
connections have been made at both the facility
power interface and outdoor unit.

Outdoor Unit — Ensure the outdoor coil and
top of the unit are free from obstructions and
debris, and all equipment access/control panels
are in place.

Using extreme caution, apply power to the unit
and inspect the wiring for evidence of open,
shorted, and/or improperly wired circuits.

Wire Size based on N.E.C. for 60° type copper con­ductors.

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Green

Thermostat

GRW2CEOY

NOTE: Jumper
between W2 and E is
required when no OD
T-Stat is used.

G

Orange

For 2-Stage
Heater
Kits

Red

Brown

Grey

W

W

2

C

R

C

R

W

2

OY

Air Handler Heat Pump OD

Section

Typical Heat Pump with Standard Air Handler

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