Nortek VQ104SD User manual

*Q104SD SERIES 13.4 SEER2 / 6.7 HSPF2
SINGLE PACKAGE HEAT PUMP - SINGLE PHASE - R410A
INSTALLATION INSTRUCTIONS
IMPORTANT
ATTENTION INSTALLERS:
It is your responsibility to know this product better than your customer. This includes being
able to install the product according to strict safety guidelines and instructing the customer on
how to operate and maintain the equipment for the life of the product. Safety should always be
the deciding factor when installing this product and using common sense plays an important
role as well. Pay attention to all safety warnings and any other special notes highlighted in the
manual. Improper installation of the furnace or failure to follow safety warnings could result in
serious injury, death, or property damage.
These instructions are primarily intended to assist qualified individuals experienced in the
proper installation of this appliance. Some local codes require licensed installation/service
personnel for this type of equipment. Please read all instructions carefully before starting the
installation. Return these instructions to the customer’s package for future reference.
DO NOT DESTROY. PLEASE READ CAREFULLY & KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.

2
INSTALLER INFORMATION
IMPORTANT SAFETY INFORMATION....................3
GENERAL INFORMATION.......................................4
Before you install this unit......................................4
Locating the Heat Pump ........................................4
Field Connections for Electrical Power Supply......4
Air Ducts.................................................................4
Unconditioned Spaces .......................................4
Acoustical Duct Work .........................................4
Air Filter Requirements...........................................5
HEAT PUMP INSTALLATION ..................................5
Packaging Removal ...............................................5
Rigging & Hoisting..................................................5
Minimum Clearances .............................................5
Ground Level..........................................................5
Rooftop ..................................................................6
Horizontal to Downflow Conversion.......................6
Condensate Drain ..................................................6
ELECTRICAL WIRING .............................................6
Pre-Electrical Checklist:.........................................6
Line Voltage ...........................................................6
Grounding ..............................................................7
Blower Speed.........................................................7
Safety Protection....................................................7
Thermostat Connections........................................7
Ambient Sensor Mounting .....................................8
Defrost Board Operation........................................8
Forced Defrost When the Following Conditions
are Met ...................................................................8
Optional Outdoor Thermostat ................................8
Optional Electric Heater Kits..................................8
START UP & ADJUSTMENTS .................................9
Pre-Start Check List...............................................9
Start-Up Procedure................................................9
Air Circulation .....................................................9
Short Cycle Protection........................................9
System Cooling...................................................9
System Heating - Heat Pump Mode...................9
System Heating - Electric Heat Mode ................9
REFRIGERANT CHARGING ....................................9
Charging an R-410A Unit in AC Mode ...................10
Charging an R-410A Unit in Heating Mode ...........10
Verification of Charge in Refrigerant Heating
Mode...................................................................10
HEAT PUMP MAINTENANCE..................................10
FIGURES & TABLES................................................11
Figure 6. Q104SD Heat Pump Dimensions ........11
Table 2. Center of Gravity & Unit Shipping
Weights..................................................11
Electrical Information .............................................12
Figure 7. Typical Heat Pump Thermostat
Connections 208V/230V ......................12
Figure 8. Wiring Diagram for 208/230V Units .....13
Charging Charts - Cooling .....................................14
Figure 9. Charging Chart for 2 Ton Units............14
Figure 10. Charging Chart for 2.5 Ton Units.......14
Figure 11. Charging Chart for 3 Ton Units..........15
Figure 12. Charging Chart for 3.5 Ton Units.......15
Figure 13. Charging Chart for 4 Ton Units..........16
Figure 14. Charging Chart for 5 Ton Units..........16
Airflow Data............................................................17
Table 3. Q104SD Airflow Data ............................17
Table 4. Control Board Status Indicators ...........17
INSTALLATION CHECKLIST...................................20
REPLACEMENT PARTS..........................................20

3
IMPORTANT SAFETY INFORMATION
Safety markings are used frequently throughout this
manual to designate a degree or level of seriousness and
should not be ignored. WARNING indicates a potentially
hazardous situation that if not avoided, could result in
personal injury or death. CAUTION indicates a potentially
hazardous situation that if not avoided, may result in
minor or moderate injury or property damage.
WARNING:
Improper installation, service, adjustment, or
maintenance may cause explosion, fire, electrical
shock or other hazardous conditions which may
result in personal injury or property damage.
Unless otherwise noted in these instructions,
only factory authorized kits or accessories may
be used with this product.
CAUTION:
This unit uses refrigerant R-410A. DO NOT use
any other refrigerant in this unit. Use of another
refrigerant will damage the unit.
WARNING:
Shut off all electrical power to the unit before
performing any maintenance or service on the
system. Failure to comply may result in personal
injury or death.
WARNING:
These units are fully charged with R-410A
refrigerant and ready for installation. When
a system is installed according to these
instructions, no refrigerant charging is required.
If repairs make it necessary for evacuation and
charging, it should only be attempted by qualified,
trained personnel thoroughly familiar with this
equipment. Some local codes require licensed
installation service personnel to service this
type of equipment. Under no circumstances
should the homeowner attempt to install and/or
service this equipment. Failure to comply with
this warning could result in equipment damage,
personal injury, or death.
WARNING:
Do not place combustible material on or against
the unit cabinet. Do not place combustible
materials, including gasoline and any other
flammable vapors and liquids, in the vicinity of
the unit.
WARNING:
The safety information listed below must be
followed during the installation, service, and
operation of this unit. Unqualified individuals
should not attempt to interpret these instructions
or install this equipment. Failure to follow safety
recommendations could result in possible
damage to the equipment, serious personal
injury or death.
• The installer must comply with all local codes and
regulations which govern the installation of this type
of equipment. Local codes and regulations take
precedence over any recommendations contained in
these instructions. Consult local building codes and the
National Electrical Code (ANSI CI) for special installation
requirements.
• This equipment contains liquid and gaseous refrigerant
under high pressure. Installation or servicing should only
be performed by qualified trained personnel thoroughly
familiar with this type equipment.
• All electrical wiring must be completed in accordance
with local, state and national codes and regulations
and with the National Electric Code (ANSI/NFPA 70)
or in Canada the Canadian Electric Code Part 1 CSA
C.22.1.
• Installation of equipment may require brazing
operations. Installer must comply with safety codes
and wear appropriate safety equipment (safety glasses,
work gloves, fire extinguisher, etc.) when performing
brazing operations.
• Install this unit only in a location and position as specified
on page 4. This unit is designed only for outdoor
installations and should be located with consideration
of minimizing the length of the supply and return ducts.
Consideration should also be given to the accessibility
of fuel, electric power, service access, noise, and shade.
• 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.
INSTALLER INFORMATION

4
Warm Air Heating and Air Conditioning Systems (NFPA
90B), and all applicable local codes. NFPA publications
are available by writing to: National Fire Protection
Association, Batterymarch Park, Quincy, ME 02269 or
visit www.NFPA.org on the web.
• Design the duct work according to methods described
by the Air Conditioning Contractors of America (ACCA).
• The ducts must be properly sized not to exceed .2”
W.C. pressure drop at 400 scfm per nominal ton of
cooling capacity.
• Duct work should be attached directly to the unit flanges
for horizontal applications.
• If roof curb is installed, the ducts must be attached to
the curb hangers, not the unit.
Unconditioned Spaces
All duct work passing through unconditioned space must
be properly insulated to minimize duct losses and prevent
condensation. Use insulation with an outer vapor barrier.
Refer to local codes for insulation material requirements.
Acoustical Duct Work
Certain installations may require the use of acoustical
lining inside the supply duct work.
• Acoustical insulation must be in accordance with the
current revision of the Sheet Metal and Air Conditioning
Contractors National Association (SMACNA)
application standard for duct liners.
• Duct lining must be UL classified batts or blankets with
a fire hazard classification of FHC-25/50 or less.
• Fiber duct work may be used in place of internal duct
liners if the fiber duct work is in accordance with the
current revision of the SMACNA construction standard
on fibrous glass ducts. Fibrous duct work and internal
acoustical lining must be NFPA Class 1 air ducts when
tested per UL Standard 181 for Class 1 ducts.
GENERAL INFORMATION
The Q104SD series heat pump is designed only for
outdoor rooftop or ground level installations. This unit
has been tested for capacity and efficiency in accordance
with AHRI Standards and will provide many years of safe
and dependable comfort, providing it is properly installed
and maintained. Abuse, improper use, and/or improper
maintenance can shorten the life of the appliance and
create unsafe hazards.
Before you install this unit
√The cooling load of the area to be conditioned must be
calculated and a system of the proper capacity selected.
It is recommended that the area to be conditioned be
completely insulated and vapor sealed.
√Check the electrical supply and verify the power supply
is adequate for unit operation. If there is any question
concerning the power supply, contact the local power
company.
√All units are securely packed at the time of shipment and
upon arrival should be carefully inspected for damage
prior to installing the equipment at the job site. Verify
coil fins are straight. If necessary, comb fins to remove
flattened or bent fins. Claims for damage (apparent or
concealed) should be filed immediately with the carrier.
√Please consult your dealer for maintenance information
and availability of maintenance contracts. Please read
all instructions before installing the unit.
Locating the Heat Pump
• Survey the job site to determine the best location for
mounting the outdoor unit.
• Choose an appropriate location that minimizes the
length of the supply and return air ducts.
• Overhead obstructions, poorly ventilated areas, and
areas subject to accumulation of debris should be
avoided.
• Sufficient clearance for unobstructed airflow through the
outdoor coil must be maintained in order to achieve rated
performance. See Figure 1 for minimum clearances to
obstructions.
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.
• Electrical power supplied to the unit 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.
Air Ducts
This unit is designed only for use with a supply and return
duct. Air ducts must be installed in accordance with the
standards of the National Fire Protection Association
Standard for Installation of Air Conditioning Systems
(NFPA 90A), Standard for Installation of Residence Type
Minimum Required
Clearances to Obstructions
0"
36"
36"
36"
TOP OF UNIT
TO BE
UNOBSTRUCTED
36” For Coil Only
Figure 1. Clearance Requirements

5
Air Filter Requirements
WARNING:
Never operate the unit without a filter in place.
Dust and lint could accumulate on internal parts,
resulting in loss of efficiency, equipment damage,
and possible fire.
NOTE TO INSTALLER: After installing or replacing the
filtration system for this unit, add the following statement
on or adjacent to the filter service panel: “Replace filter(s)
installed in your system only with the same dimensional
size filters that are being replaced.”
• An air filter is not supplied with this package unit as
shipped from the factory. The installer must provide
a high velocity filter that is appropriately sized to the
return air duct opening or internal filter rack. The filters
must comply with ANSI/UL 900 or CAN/ULC-S111.
• Horizontal installations require the air filter system be
installed in the return air ductwork.
• For recommended external filter sizes, refer to Table
1 (page 10) under Heat Pump Maintenance
• All return air must pass through the filters before entering
the evaporator coil. It is important that all filters be
kept clean and replaced frequently to ensure proper
operation of unit. Dirty or clogged filters will reduce the
efficiency of the unit and result in unit shutdowns.
• Air filter pressure drop is recommended not to exceed
0.08 inches WC.
• Single phase downflow applications require either a
Nortek internal filter kit be used, or an air filter system
be installed in the return air ductwork. See Table 2 for
specific unit model and filter sizes.
• Horizontal installations require the air filter system be
installed in the return air ductwork.
HEAT PUMP INSTALLATION
Packaging Removal
Remove the shipping carton and User’s Manual from
the equipment. Take care not to damage the tubing
connections when removing the carton. For rooftop
installations, remove and discard the two supports
attached beneath the unit.
Rigging & Hoisting
WARNING:
To avoid the risk of property damage, personal
injury, or death, it is the rigger’s responsibility
to ensure that whatever means are used to hoist
the unit are safe and adequate:
• The lifting equipment must be adequate for the
load. Refer to Table 2 (page 11) for unit weights.
• The unit must be lifted from the holes in the
base rails using cables or chains.
• Spreader bars are required to protect the unit
and ensure even loading.
• Keep the unit in an upright position at all times.
The rigging must be located outside the units
center of gravity. Refer to Figure 6 (page 11) for
locating the center of gravity.
• All panels must be securely in place during
rigging and hoisting.
Minimum Clearances
Q104SD units are certified as combination heating and
cooling equipment for outdoor installation only. Figure 1
(page 4) displays the minimum clearances to obstructions
for both downflow and horizontal discharge.
Units may be installed on wood flooring or on Class A,
B, or C roof covering material when used with bottom
supply and return air ducts as long as the following
requirements are met:
• If using horizontal supply and return air ducts, the
horizontal roof curb kit and return air kit must be
installed prior to unit installation. Horizontal roof curb
is required.
• If using bottom discharge with return air ducts a roof
curb must be installed prior to unit installation. See
Rigging and Hoisting section for setting of the unit.
Ground Level
Ground level installations must be located according
to local building codes or ordinances and these
requirements:
• Clearances must be in accordance with those shown
in Figure 2. Also consider clearances for access to the
internal filter.
2”
Figure 2. Ground Level Installation

6
Roof
Curb
Figure 3. Roof Top Installation
Figure 4. Condensate Drain Location
Condensate
Drain
ELECTRICAL WIRING
WARNING:
To avoid risk of electrical shock, personal injury,
or death, disconnect all electrical power to the unit
before performing any maintenance or service.
The unit may have more than one electrical
supply.
Label all wires prior to disconnection when
servicing the unit. Wiring errors can cause
improper and dangerous operation
• Electrical connections must be in compliance with
all applicable local codes and ordinances, and with
the current revision of the National Electric Code
(ANSI/NFPA 70).
• For Canadian installations the electrical connections
and grounding shall comply with the current Canadian
Electrical Code (CSA C22.1 and/or local codes).
Pre-Electrical Checklist:
√Verify that the voltage, frequency, and phase of the
supply source match the specifications on the unit
rating plate.
√Verify that the service provided by the utility is sufficient
to handle the additional load imposed by this equipment.
refer to the unit wiring label for proper high and low
voltage wiring.
√Verify factory wiring is in accordance with the unit
wiring diagram. See Figure 8 (page 13). Inspect for
loose connections.
Line Voltage
• A wiring diagram is located on the inside cover of the
units electrical box. The installer should become familiar
with the wiring diagram before making any electrical
connections to the outdoor unit.
• An electrical disconnect must be located within sight
of and readily accessible to the unit. This switch shall
be capable of electrically de-energizing the unit.
• Line voltage to the unit should be supplied from a
dedicated branch circuit containing the correct fuse
• A suitable mounting pad must be provided and separate
from the building foundation. The pad must be level to
ensure proper condensate disposal and strong enough
to support the unit’s weight. The slab height must be a
minimum of 2” (5cm) above grade and with adequate
drainage. See Figure 3.
• Units require horizontal roof curb and return air kit for
horizontal installations.
• Ductwork should be attached directly to flanges on
panels supplied in horizontal duct conversion kits.
Rooftop
Rooftop installations must be located according to local
building codes or ordinances and these requirements:
• The roof must be capable of handling the weight of the
unit. For unit weights, see Table 3 (page 17). Reinforce
the roof if necessary.
• The appropriate accessory roof curb (Figure 4) must be
installed prior to unit installation. The roof curb must be
square and level to ensure proper condensate drainage.
Please follow all instructions provided with the kit.
• Secure roof curb or frame to roof using acceptable
mechanical methods per local codes. NOTE:Make sure
the two supports beneath the unit have been removed.
Horizontal to Downflow Conversion
If down flow ducts are required, the unit must be converted
following the steps below for the supply and return ducts.
1. Locate the duct cap inside the duct openings and
remove the screw holding it in place.
2. Lift the cap out of the unit. (Hint: The cap can be pushed
up from the bottom by reaching through the fork slot).
3. Cover the horizontal duct opening with the horizontal
duct cap. The insulation will be on the indoor side.
4. Fasten the cover with screws to seal.
Condensate Drain
Condensate is removed from the unit through the 3/4”
female pipe fitting located on the front side of the unit.
Install a 2 inch condensate trap in the drain line of the
same size and prime with water. See Figure 5.
When connecting rigid drain line, hold the female fitting
with a wrench to prevent twisting. Do not over tighten!
Refer to local codes and restrictions for proper condensate
disposal requirements.

7
or circuit breaker for the unit. Incoming field wiring
and minimum size of electrical conductors and circuit
protection must be in compliance with information listed
on the outdoor unit data label. Any other wiring methods
must be acceptable to authority having jurisdiction.
• The outdoor unit requires both power and control
circuit electrical connections. Refer to Figure 7 (page
12) for identification and location of outdoor unit field
wiring interfaces. Make all electrical connections in
accordance with all applicable codes and ordinances.
• Overcurrent protection must be provided at the branch
circuit distribution panel and sized as shown on the unit
rating label and according to applicable local codes.
See the unit rating plate for minimum circuit ampacity
and maximum overcurrent protection limits.
• Provide power supply for the unit in accordance with the
unit wiring diagram, and the unit rating plate. Connect
the line-voltage leads to the terminals on the contactor
inside the control compartment.
• Use only copper wire for the line voltage power supply
to this unit. Use proper code agency listed conduit and
a conduit connector for connecting the supply wires
to the unit. Use of rain tight conduit is recommended.
• Units are shipped from the factory wired for 240 volt
operation. For 208V operation remove the lead from
the transformer terminal marked 240V and connect it
to the terminal marked 208V.
• Optional equipment requiring connection to the power
or control circuits must be wired in strict accordance
of the NEC (ANSI/NFPA 70), applicable local codes,
and the instructions provided with the equipment.
Grounding
WARNING:
The unit cabinet must have an uninterrupted or
unbroken electrical ground to minimize personal
injury if an electrical fault should occur. Do not
use gas piping as an electrical ground!
This unit must be electrically grounded in accordance
with local codes or, in the absence of local codes, with
the National Electrical Code (ANSI/NFPA 70) or the CSA
C22.1 Electrical Code. Use the grounding lug provided
in the control box for grounding the unit.
Blower Speed
The blower speed is preset (for operation) at the factory
for heating and cooling. These factory settings are listed
in Table 3 (page 17). For optimum system performance
and comfort, it may be necessary to change the factory
set speed.
Safety Protection
• A high-pressure switch is factory-installed and located
in the compressor discharge line of the unit. The switch
is designed to de-energize the system when very high
pressures occur during abnormal conditions. Under
normal conditions, the switch is closed. If the discharge
pressure rises above 650 psig, then the switch will
open and de-energize the outdoor unit. The switch
will close again once the liquid pressure decreases
to 460 psig. Please note that the switch interrupts the
thermostat inputs to the unit. When the switch opens
and then closes, there will be a 5 minute short cycling
delay before the outdoor unit will energize.
• A low-pressure switch is factory installed and located
on the suction line of the unit. The switch is designed
to protect the compressor from a loss of charge by
interrupting the thermostat inputs to the unit. If the
suction pressure falls below 20 psig, the switch will
open and de-energize the unit. The switch will close
again when the suction pressure increases above 35
psig. When the switch opens and then closes, there
is a 5 minute short cycling delay before the outdoor
unit will energize. Under normal conditions the switch
is closed.
CAUTION:
To avoid personal injury or property damage,
make sure the motor leads do not come into
contact with any uninsulated metal components
of the unit.
1. Shut off all electrical power to the unit and remove
the blower panel. Locate the orange and red wires
terminated to the blower motor. NOTE: The orange wire
controls cooling operation while the red wire controls
heating operation.
2. Verify the required speed from the airflow data found
in Table 3 (page 17). Place appropriate wire on the
correct motor speed tap for the required airflow point.
Thermostat Connections
• This heat pump may require a 2-stage cooling / heating
thermostat if used in conjunction with certain installed
accessories. Refer to your manual for additional
instructions.
• The low voltage wires must be properly connected to
the units low voltage terminal block as shown in Figure
7 (page 12).
• The Lterminal on the defrost control board is used for
fault monitoring. This is a 24V output and may be used
with compatible thermostats. Refer to the thermostat
manufacturer's manual to ensure compatibility.
FAILURE TO ENSURE COMPATIBILITY CAN LEAD
TO THERMOSTAT FAILURE.
• The thermostat should be mounted about 5 feet
above the floor on an inside wall. DO NOT install the
thermostat on an outside wall or any other location
where its operation may be adversely affected by radiant
heat from fireplaces, sunlight, or lighting fixtures, and
convective heat from warm air registers or electrical
appliances. Refer to the thermostat's instruction sheet
for detailed mounting and installation information.

8
Ambient Sensor Mounting
For optimum performance of the heat pump system, the
ambient sensor must be mounted on the outside of the
unit. See Figure 5 (page 8).
1. Remove the mounting bracket wire tied to the control
bracket and all hardware included in the packet.
2. Remove star bushing from 7/8” hole in corner panel
of the unit. See Figure 5.
3. Route the ambient sensor through the 7/8” hole in the
corner panel of the unit, and then through the 7/8” hole
in the mounting bracket.
4. Route the sensor through the star bushing. Use the star
bushing to secure the mounting bracket to the unit.
5. Secure the ambient sensor inside the plastic clip and
secure it to the mounting bracket with the screw and
nut provided.
6. Install one spacer nut between the plastic clip and
mounting bracket.
7. Bend the mounting bracket into position and screw
the mounting bracket to the corner panel.
Defrost Board Operation
1.Heat Pump operates in heating mode until the
combination of outdoor ambient and outdoor coil
temperatures initiate a defrost cycle. The outdoor coil
temperature must be at or below 25.5°F before the
defrost cycle begins.
2.There must be a minimum of 35 minutes between defrost
cycles. After this time, coil temperature & outdoor
ambient will drive a call for defrost after conditions
are met continuously for 30 seconds before a defrost
cycle is initiated.
3.Outdoor fan is off during defrost operation.
4.The defrost cycle ends when the outdoor temperature
reaches 50°F-80°F, dependent on TERM TEMP jumper
position (default 70°F-no jumper) or if the defrost
terminate time of 11 minutes is reached.
See "Control Board Status Indicators" for operation
and fault codes, Table 4 (page 17).
Forced Defrost When the Following Conditions
are Met:
• LPS and HPS are closed
• Y1 input is active
• O input is either active or inactive
• TEST terminals shorted for more than three seconds
Compressor will start and unit will operate in DEFROST
mode.
Unit will run in DEFROST mode after pins have been
shorted at least 3 seconds regardless of whether short
is removed or not.
Qualifying conditions of minimum ambient or coil
temperature do not need to be met when the unit is forced
into defrost. If the short across the TEST pins exist, the
unit will stay in DEFROST as long as the short remains
or until the TERMINATE TIME is reached (11 minutes).
This will happen regardless of coil temperature.
W2 OUT is active during this time if the O input is inactive.
If after 11 minutes the short remains, the unit shall not
run in any mode and the display shall flash 'DF' until the
short is removed.
W2 OUT shall remain on during the whole time that the
short exists, if the O input is inactive.
Crankcase Heater (CCH) Operation
The outdoor temperature is measured by the ambient
temperature sensor. The CCH is enabled during first 2
minutes after board power up regardless of any other
condition.
• The CCH is disabled during compressor operation.
• The CCH is disabled when OD temperature > 70F.
• The CCH is enabled when OD temperature < 71F.
Optional Outdoor Thermostat (Field Supplied)
An outdoor thermostat can be installed in the field with
2-stage electric heat by removing the orange wire from the
W2 terminal on the unit terminal block and re-connecting
it to the outdoor thermostat. Connect the other side of
the outdoor thermostat to W2 on the unit terminal block..
Optional Electric Heater Kits
Optional electric heater kits are available in 5 kw through
20 kw heating capacities. Single package heat pumps
are designed to allow optional electric heat to be field
installed as required by the building’s particular heating
load. The options available for each unit are shown in the
heater kit installation instructions. A heating/cooling 24V
thermostat should be used when an electric heater kit is
installed. NOTE: A 2-stage heating thermostat is required
if installing a 2-stage heater kit. As previously noted, a
field installed circuit breaker kit is available as a means
of electrical disconnect for the unit. Install the heater kits
as directed by the instructions supplied with the heater
kit. Follow all cautions and warnings as directed.
Figure 5. Ambient Sensor Mounting
Bolt
Nut
Nut
Ambient Sensor
Plastic Clip
Star Bushing

9
2. Feel the air being circulated by the indoor blower
and verify that it is cooler than ambient temperature.
Listen for any unusual noises. If unusual sounds occur,
determine the source of the noise and correct as
necessary.
3. Allow the cooling system to operate for several minutes
and then set the temperature selector above room
temperature. Verify the fan and compressor cycle off
with the thermostat. NOTE: The blower should also
stop unless fan mode is set to ON.
System Heating - Heat Pump Mode
1. Set the thermostat’s system mode to HEAT and the
fan mode to AUTO. Gradually raise the thermostat
temperature setpoint above room temperature and
verify the compressor, outdoor fan, and indoor blower
energize.
2. Feel the air being circulated by the indoor blower and
verify it is warmer than ambient temperature. Listen for
any unusual noises. If unusual sounds occur, determine
the source of the noise and correct as necessary
System Heating - Electric Heat Mode (If
Equipped-Optional)
1. Set the thermostat's system mode to EMER. HEAT and
the fan mode to AUTO. Gradually raise the thermostat
temperature setpoint above room temperature and
verify the compressor and outdoor fan remain off, but
that the blower and heaters are energized.
2. Feel the air being circulated by the indoor blower and
verify that it is warmer than ambient temperature.
Listen for any unusual noises. If unusual sounds
occur, determine the source of the noise and correct
as necessary.
REFRIGERANT CHARGING
WARNING:
Single Packaged Heat Pumps are shipped fully
charged with R-410A refrigerant and ready
for installation. When a system is installed
according to these instructions, no refrigerant
charging is required. If repairs make it necessary
for evacuation and charging, it should only be
done by qualified, trained personnel thoroughly
familiar with this equipment. Some local codes
require licensed installation/service personnel
to service this type of equipment. Under no
circumstances should the owner attempt to
install and/or service this equipment. Failure to
comply with this warning could result in property
damage, personal injury, or death.
The system refrigerant charge can be checked and
adjusted through the service ports provided at the front
panel. Use only gauge lines which have a Schrader
depression device present to actuate the valve. Draw a
vacuum on gauge lines to remove air before attaching
them to the service ports on the unit.
START UP & ADJUSTMENTS
Pre-Start Check List
√Verify the unit is level and allows condensate to drain.
√Verify the outdoor coil and top of the unit are free from
obstructions and debris, and all equipment access/
control panels are in place.
√Verify that the duct work is sealed to prevent air leakage.
√Verify that the line voltage power leads are securely
connected and the unit is properly grounded.
√Verify that the low voltage wires are securely connected
to the correct leads on the low voltage terminal strip.
√Verify that the outdoor fan turns freely.
√Verify that the power supply branch circuit overcurrent
protection is sized properly.
√Verify that the thermostat is wired correctly. The
thermostat system mode should be set to OFF and
the thermostat fan mode should be set to AUTO.
Start-Up Procedure
Close all electrical disconnects to energize the system.
CAUTION:
If the unit is equipped with a crankcase heater,
allow 24 hours prior to continuing the start up
procedures to allow for heating of the refrigerant
compressor crankcase. Failure to comply may
result in damage and could cause premature
failure of the system. This warning should be
followed at initial start up and any time the power
has been removed for 12 hours or longer.
Air Circulation
Leave the thermostat system mode on OFF, and set the
fan mode to ON. Blower should run continuously. Check
the air delivery at the supply registers and adjust register
openings for balanced air distribution. Examine ductwork
for leaks or obstruction if insufficient air is detected. Set
the thermostat fan mode to AUTO. The blower should
stop running.
Short Cycle Protection
1. With the system operating in cooling mode, note the
temperature setting of the thermostat and gradually
raise the set-point temperature until the unit de-
energizes.
2. Immediately lower the set point temperature of the
thermostat to its original setting and verify that the
indoor blower is energized.
3. After approximately 5 minutes, verify the compressor
and fan energize and the temperature of the discharge
air is cooler than the room temperature.
System Cooling
1. Set the thermostat’s system mode to COOL and the
fan mode to AUTO. Gradually lower the thermostat
temperature setpoint below room temperature and
verify the outdoor unit and indoor blower energize.

10
IMPORTANT NOTES:
• To achieve rated capacity and efficiency the compressor
must be exposed to refrigerant for at least 24 hours
prior to running and then must be run for a minimum
of 12 hours.
• The refrigerant cooling charging charts are applicable
to units at rated factory airflows for the indoor coil.
See Figure 9 and Figure 10 (page 14), Figure 11
and Figure 12 (page 15), Figure 13 and Figure 14
(page 16).
Charging an R-410A Unit in AC Mode
(With Outdoor Temperatures Above 60° F)
1. With the system operating at steady-state, measure
the liquid refrigerant pressure in psig at the service
valve. Measure the liquid refrigerant temperature in
Fahrenheit on the liquid line before TXV at indoor coil.
2. For the temperature measured, determine the required
liquid refrigerant pressure from the appropriate charging
charts in Figure 9 and Figure 10 (page 14), Figure 11
and Figure 12 (page 15), Figure 13 and Figure 14
(page 16).
3. If the pressure measured in step 1 is greater than
the required liquid refrigerant pressure determined in
step 4, then there is too much charge in the system.
Remove refrigerant and repeat steps 1 through 3 until
the system is correctly charged.
4. If the pressure measured in step 1 is less than the
required liquid refrigerant pressure determined in
step 4, then there is too little charge in the system.
Add refrigerant and repeat steps 1 through 3 until the
system is correctly charged.
Charging an R-410A Unit in Heating Mode
Use the steps below for proper charging of unit in heat
mode:
1. Evacuate the refrigerant system.
2. Weigh in the proper charge as shown on the unit rating
plate (during heating mode operation).
3. Verify the unit is operating properly according to the
System Heating-Heat Pump Mode section on page 11.
Verification of Charge in Refrigerant Heating
Mode
• Block off half of the outdoor fan discharge grille area
as shown.
• With the unit in COOLING MODE, use the appropriate
charging chart curves shown in Tables 10-15 as a guide
to ensure proper operation of your system.
• For units with a TXV, the refrigerant system should be
evacuated and the proper charge weighed in as shown
on the unit rating plate.
• Return to the system when the outdoor temperature
is 60 degrees F or higher and follow the steps defined
in Charging an R410A Unit in AC Mode.
NOTE: Unit charge MUST be verified in cooling season.
HEAT PUMP MAINTENANCE
WARNING:
To prevent electrical shock, personal injury, or
death, disconnect all electrical power to the unit
before performing any maintenance or service.
Unit may have more than one electrical supply.
CAUTION:
Use care when servicing the heat pump or
removing components. Personal injury can
result from sharp edges present in equipment
constructed with sheet metal
Proper maintenance is important to achieve optimum
performance from the heat pump. The ability to properly
perform maintenance on this equipment requires certain
mechanical skills and tools. If you do not possess these
skills, contact your dealer for maintenance. Consult
your local dealer about the availability of maintenance
contracts. Routine maintenance should include the
following:
• Inspect and clean or replace air filters at the beginning
of each heating and cooling season, or more frequently
if required.
• Inspect the condensate drain and outdoor coil at the
beginning of each cooling season. Remove any debris.
Clean the outdoor coil and louvers as necessary using a
mild detergent and water. Rinse thoroughly with water.
• Inspect the electrical connections for tightness at the
beginning of each heating and cooling season. Service
as necessary.
CAUTION:
The unit should never be operated without a
filter in the return air system. Replace disposable
filters with the same type and size.
RECOMMENDED EXTERNAL FILTER SIZES
Nominal
Cooling
(Tonnage)
Filter Size
(in. x in.)
Approximate
Air Flow Range
(CFM)
Approximate Filter
Area (sq. in.)*
2.0 20 x 25 600-900 480
2.5 25 x 25 750-1125 600
3.0 25 x 25 900-1350 600
3.5 20 x 25 (2 required) 1050-1575 960
4.0 20 x 25 (2 required) 1200-1700 960
5.0 20 x 25 (2 required) 1500-2000 960
*Based on velocity of 300ft/min for disposable filters.
Table 1. Recommended External Filter Sizes
• The motors for the circulating air blower and the outdoor
fan are pre-lubricated at the factory. No further oiling
is required for the life of this product.
Minimum Required
Clearances to Obstructions
0"
36"
36"
36"
TOP OF UNIT
TO BE
UNOBSTRUCTED
36” For Coil Only

11
Table 3
Table 2. Center of Gravity & Unit Shipping Weights
MODEL
NUMBER
Q104SD-
UNIT
WEIGHT
(WITH PACKAGING)
CENTER OF GRAVITY HEIGHT -C-
(IN INCHES)
-A- -B- WITH BASE RAILS WITHOUT BASE RAILS
X24K 410 28.0 25.5 39.0 35.3
X30K 410 28.0 26.0 39.0 35.3
X36K 442 28.0 25.5 39.0 35.3
X42K 507 29.5 26.0 43.0 39.3
X48K 522 29.5 26.0 43.0 39.3
X60K 530 29.5 26.0 43.0 39.3
FIGURES & TABLES
Top View
24.9
13.5
16
12
13.3
13.5
16
12
CG
A
47.5
.75" NPT Female
Drain Connector
B
DOWNFLOW
SUPPLY DUCT
OPENING
DOWNFLOW
RETURN DUCT
OPENING
23.5
Back View
13.5
16.0
13.7
13.5
16.0
12.45
11.75 22.75
55.8
C
HORIZONTAL
SUPPLY DUCT
OPENING HORIZONTAL
RETURN DUCT
OPENING
4.0
CONDENSING
COIL
5.0
8
4.00
Side View
1 1/4 Ø Power Entry
1 3/4 Ø Power Entry (Capped)
7/8 Ø Control Wiring Entry
23 3/5
27 1/5
30
1 4/5
4
Figure 6. Q104SD Heat pump Dimensions

12
Electrical Information
Typical Wiring (Field Supplied) for 1-Stage Heat Pump Heat/Cool, 1-Stage Electric Heat
Typical Wiring (Field Supplied) for 1-Stage Heat Pump Heat/Cool, 2-Stage Electric Heat with
an Optional Outdoor Thermostat
Figure 7. Typical Heat Pump Thermostat Connections 208V / 230V
G
C
R
E
O
Y1
W2
G
C
A1
W1
R
Y2
E
O
Y1
W2
Y1- IN
R
O
C
W2 IN
Y2 IN (Not Used)
W2 Out
Defrost
Board
L-24V Output Fault Monitor
(See thermostat manual for
compatibility)
Brown
Orange
Accesory Heat
Plug
Indoor
Thermostat
Sub-Base
Unit Terminal
Block
1
2
3
4
5
6
7
8
9
to Blower Relay (Cooling Speed)
G
C
R
E
O
Y1
W2
G
C
A1
W1
R
Y2
E
O
Y1
W2
Y1- IN
R
O
C
W2 IN
Y2 IN (Not Used)
W2 Out
Defrost
Board
L-24V Output Fault Monitor
(See thermostat manual for
compatibility)
Brown
Orange
Accesory Heat
Plug
Indoor
Thermostat
Sub-Base
Unit Terminal
Block
1
2
3
4
5
6
7
8
9
Optional Outdoor
Thermostat
(Field Supplied)
to Blower Relay (Cooling Speed)

13
Figure 8. Wiring Diagram for 208/230V Units

14
Figure 9. Charging Chart for 2 Ton Units
Figure 10. Charging Chart for 2.5 Ton Units
Charging Charts - Cooling

15
Figure 12. Charging Chart for 3.5 Ton Units
Figure 11. Charging Chart for 3 Ton Units

16
Figure 13. Charging Chart for 4 Ton Units
Figure 14. Charging Chart for 5 Ton Units

17
Table 3. Q104SD Airflow Data
MODEL
NUMBER
Q104SD-
TAP
EXTERNAL STATIC PRESSURE DROP - INCHES WATER COLUMN
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
X24K
Tap T1 825 38.4 785 40.3 710 44.4 645 48.9 580 54.5 510 62.0 435 72.5 - -
Tap T2 970 32.6 925 34.2 865 36.5 800 39.5 715 44.1 650 48.5 590 53.5 520 60.5
Tap T3** 1070 29.6 1010 31.3 9456 33.4 905 34.9 815 38.8 745 42.5 675 46.9 615 51.2
Tap T4* 1190 26.6 1140 27.7 1070 29.6 1020 30.9 955 33.1 860 36.7 805 39.3 765 41.4
Tap T5 1330 23.8 1275 24.8 1220 25.9 1165 27.1 1105 28.6 1045 30.3 955 33.0 880 35.9
X30K
Tap T1 890 35.5 830 38.0 765 41.3 685 46.0 625 50.6 575 54.9 500 62.9 420 75.4
Tap T2 970 32.6 925 34.2 865 36.5 800 39.5 715 44.1 650 48.5 590 53.5 520 60.5
Tap T3** 1190 26.6 1140 27.7 1070 29.6 1020 30.9 955 33.1 860 36.7 805 39.3 765 41.4
Tap T4* 1380 22.9 1335 23.7 1275 24.8 1220 25.9 1165 27.1 1095 28.8 1020 31.0 945 33.4
Tap T5 1640 19.3 1605 19.7 1545 20.4 1490 21.2 1435 22.0 1380 22.9 1325 23.9 1250 25.3
X36K
Tap T1 1135 27.8 1075 29.4 1010 31.2 950 33.3 865 36.6 770 41.0 695 45.5 620 51.0
Tap T2** 1240 25.4 1185 26.6 1130 28.0 1055 29.9 995 31.8 920 34.3 825 38.2 755 41.9
Tap T3 1420 22.3 1370 23.1 1310 24.2 1250 25.3 1205 26.2 1125 28.1 1065 29.7 975 32.4
Tap T4* 1630 19.4 1590 19.9 1530 20.7 1465 21.6 1410 22.4 1345 23.5 1270 24.9 1195 26.4
Tap T5 1700 18.6 1660 19.1 1595 19.8 1535 20.6 1480 21.3 1420 22.2 1360 23.3 1280 24.7
X42K
Tap T1** 1260 25.1 1200 26.4 1135 27.9 1070 29.5 980 32.2 905 34.9 830 38.1 760 41.5
Tap T2 1375 23.0 1330 23.7 1270 24.9 1220 25.9 1155 27.4 1075 29.3 970 32.5 900 35.1
Tap T3 1575 20.1 1520 20.8 1470 21.5 1420 22.3 1355 23.3 1295 24.4 1215 26.0 1095 28.9
Tap T4* 1655 19.1 1600 19.8 1555 20.3 1500 21.1 1445 21.9 1380 22.9 1315 24.0 1215 26.0
Tap T5 1850 17.1 1795 17.6 1740 18.2 1710 18.5 1640 19.3 1595 19.8 1540 20.5 1475 21.4
X48K
Tap T1 950 33.2 900 35.1 865 36.6 730 43.4 670 47.0 585 54.2 510 62.2 - -
Tap T2** 1645 19.2 1595 19.8 1520 20.8 1475 21.4 1415 22.3 1350 23.4 1265 25.0 1200 26.4
Tap T3 1765 17.9 1705 18.5 1625 19.4 1570 20.1 1525 20.7 1450 21.8 1405 22.5 1305 24.2
Tap T4* 1995 15.8 1945 16.2 1875 16.8 1790 17.6 1725 18.3 1660 19.0 1610 19.6 1550 20.4
Tap T5 2390 13.2 2335 13.5 2300 13.7 2240 14.1 2180 14.5 2130 14.8 2075 15.2 2015 15.7
X60K
Tap T1 1090 29.0 1030 30.6 960 33.0 880 36.0 790 40.0 715 44.2 640 49.3 570 55.4
Tap T2** 1765 17.9 1705 18.5 1625 19.4 1570 20.1 1525 20.7 1450 21.8 1405 22.5 1305 24.2
Tap T3 2000 15.8 1945 16.2 1890 16.7 1835 17.2 1785 17.7 1735 18.2 1690 18.7 1635 19.3
Tap T4* 2235 14.1 2180 14.5 2125 14.9 2075 15.2 2035 15.5 1985 15.9 1940 16.3 1895 16.7
Tap T5 2390 13.2 2335 13.5 2300 13.7 2240 14.1 2180 14.5 2130 14.8 2075 15.2 2015 15.7
Notes:
1. * Denotes factory set cooling speed
2. ** Denotes factory set electric heating speed
3. Heat rise calculated based on 10KW of electric heat using formula (KW x 3413)/1.08/CFM
4. Temperature rises in tables are approximate. Actual temperature rises may vary.
5. Shaded areas are not approved for proper electric heat operation above 40F rise.
6. Deduct approximately 3% from airflow shown for 208V applications.
Airflow Data
Table 4. Control Board Status Indicators
STATUS
INDICATOR
STATUS
TYPE
DIAGNOSTIC
DESCRIPTION
Operating Status Cooling, 1st Stage
Operating Status Heating, 1st Stage
Operating Status Anti Short Cycle Timer
Operating Status Defrost
Operating Status Power on, no call for
operation
Fault Pressure Switch, low
Fault Pressure Switch, high
Fault Temperature Sensor,
Ambient
Fault Temperature Sensor, Coil
Fault Board
(flashing) Input Error
Forced defrost - test
short applied longer than
11 minutes

18

19

INSTALLATION CHECKLIST
REFRIGERATION SYSTEM
Was unit given 24 hr warm up period
for crankcase heaters (if applicable)? YES NO
Stage-1 Liquid Pressure: HIGH
SIDE:
Stage-1 Suction Pressure: LOW
SIDE:
INSTALLER: PLEASE LEAVE THESE
INSTRUCTIONS WITH THE OWNER.
INSTALLATION ADDRESS:
CITY: STATE:
UNIT MODEL #:
UNIT SERIAL #:
Unit Installed Minimum clearances per
Figure 1 (page 4) YES NO
INSTALLER NAME:
CITY STATE
Has the owner’s information been
reviewed with the customer? YES NO
Has the Literature Package been left
with the unit? YES NO
FILTER SYSTEM
Filter(s) secured in place? YES NO
Filter(s) clean? YES NO
ELECTRICAL SYSTEM
Electrical connections tight? YES NO
Line voltage polarity correct? YES NO
Rated Voltage: VOLTS:
L1-L2 Volts: VOLTS:
Has the thermostat been calibrated? YES NO
Is the thermostat level? YES NO
Is the heat anticipator setting correct? YES NO
REPLACEMENT PARTS
Replacement parts are available through your distributor.
Please have the complete model and serial number of
the unit when ordering replacement parts.
ELECTRICAL:
• Ambient Sensor • Contactors
• Capacitors • Pressure Switches
• Coil Sensor • Relays
• Compressors • Transformers
MOTORS:
• Blower Motor
• Fan Motor
COMPONENTS:
• Blower Assembly • Fan Grille
• Cabinet Panels • Filter/Driers
• Expansion Valves
PROPOSITION 65 WARNING:
WARNING: This product contains chemicals
known to the state of California to cause cancer.
WARNING: This product contains chemicals
known to the state of California to cause birth
defects or other reproductive harm.
Specifications & illustrations subject to change without notice or incurring obligations (09/22).
O’Fallon, MO, © Nortek Global HVAC LLC 2022. All Rights Reserved.
1041473A
(Replaces 10414730)