DURASTAR DRA1U30S1A User manual

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DURASTAR.COM1
INSTALLATION MANUAL
Single Zone Side-Discharge Heat Pump:
30K to 60K
DRA1U30S1A, DRA1U36S1A, DRA1U48S1A, DRA1U60S1A
Model Number:
Serial Number:
Purchase Date:
Installing Contractor Company Name:
TIP
Capture relevant information about your Durastar mini-split equipment before it is
installed and write it above for future reference.
208/230V 1ph 60Hz 24V / RS485 Communicating

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TABLE OF CONTENTS
TABLE OF CONTENTS.....................................................................................................................................2
INTRODUCTION ..................................................................................................................................................3
WARNINGS ............................................................................................................................................................3
IMPORTANT SAFETY PRECAUTIONS ....................................................................................................4
OPERATING TEMPERATURES....................................................................................................................7
ACCESSORIES......................................................................................................................................................8
PARTS IDENTIFICATION .................................................................................................................................9
OUTDOOR UNIT INSTALLATION..............................................................................................................10
STEP 1: SELECT INSTALLATION LOCATION .....................................................................................10
STEP 2: INSTALL THE DRAIN JOINT ...................................................................................................... 11
STEP 3: MOUNT THE OUTDOOR UNIT..................................................................................................12
REFRIGERANT PIPING CONNECTION...................................................................................................13
SYSTEM EVACUATION .................................................................................................................................. 20
WIRING THE OUTDOOR UNIT ....................................................................................................................21
CONTROL LOGIC ..............................................................................................................................................24
POWER SPECIFICATIONS ............................................................................................................................24
FINAL CHECKS................................................................................................................................................... 26
TEST RUN ..............................................................................................................................................................27
TROUBLESHOOTING..................................................................................................................................... 28
LED DISPLAY...................................................................................................................................................... 29
ERROR AND OPERATING CODES .......................................................................................................... 30
WIRING DIAGRAMS..........................................................................................................................................31
JOB SITE INFORMATION SHEET............................................................................................................. 33

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WARNINGS
The warning symbol indicates cautionary information for the user. Extra care and
precautions should be taken to ensure the user's safety.
The pencil indicates any manufacturer notes relating to surrounding content. These may
include further clarifications or call-outs.
A light bulb symbol indicates suggested manufacturer tips for the user to get the most
out of the Durastar equipment and to accommodate the best user experience.
Symbols Used in This Manual
INTRODUCTION
To better serve you, please do the following before contacting customer service:
• If you received a damaged product, immediately contact the retailer or dealer that sold you the
product.
• Read and follow this owner's manual carefully to help you use and maintain your air handler.
• Read the troubleshooting section of this manual as it will help you diagnose and solve common
issues.
• Visit us on the web at WWW.DURASTAR.COM to download product guides and up-to-date
information.
• If you need warranty service, our friendly customer service representatives are available via
email at [e-mail] or by telephone at 1-888-320-0706.

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IMPORTANT SAFETY PRECAUTIONS
Improper handling can cause serious damage or injury. Please read the following safety
information in its entirety.
Operation, Cleaning, and Maintenance Safety Precautions
• Children and people with reduced physical, sensory, or mental capabilities, or lack of experience
and knowledge, should only use this air handler if they are given supervision and instructions
concerning use of the air handler in a safe way and understand the hazards involved.
• Children should not play with the air handler.
• Never stick fingers, other body parts, or other objects into the air inlet or outlet. The internal fan
may be rotating at high speeds. This could result in injury.
• Installation and maintenance must be performed by qualified professionals. Otherwise, you may
experience personal injury or damage to the air handler and surrounding property.
• If an abnormal situation arises (like a burning smell), immediately turn off the air handler and
disconnect power at the circuit breaker immediately. Then contact your dealer or a qualified
professional for service.
• Do not climb onto or place objects on top of the outdoor unit.
• Do not install the air handler in a wet room such as a bathroom or laundry room. Too much
exposure to water could cause electrical components to short circuit.
• Do not operate the air handler with wet hands. This may cause electric shock.
• Turn off the device and disconnect the power before cleaning. Failure to do so can cause
electrical shock.
• Do not clean the air handler with excessive amounts of water.
• Do not clean the air handler with combustible cleaning agents. Combustible cleaning agents can
cause fire or deformation.
• Do not use flammable materials such as hair spray, lacquer, or paint near the air handler as they
may catch fire.
• Do not operate the air handler in places near combustible gases. Emitted gases may collect
around the air handler and cause an explosion.
• Do not use the air handler for any other purpose than its intended use.
• Turn off the air handler if you are not going to use it for a long time.
• Make sure that water can drain unhindered from the unit.
• Do not allow the air handler to operate for long periods of time with doors or windows open, or if
the humidity is very high.
• Do not expose your body directly to cool air for a prolonged period of time.
• If the air handler is used together with burners or other heating devices, thoroughly ventilate the
room to avoid oxygen deficiency and carbon monoxide build up.
• In certain environments, such as kitchens, server rooms, etc., the use of specially designed air
handler units is highly recommended.
• As with any mechanical equipment, contact with sharp sheet metal edges can result in personal
injury. Take care while handling this equipment and wear gloves and protective clothing.

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• The product must be properly grounded at the time of installation, or electrical shock may occur.
• If there is a serious safety issue with the power supply, stop work immediately. Explain your
reasoning to the client, and refuse to install the unit until the safety issue is properly resolved.
• For all electrical work, follow all local and national wiring standards, regulations, and the
Installation Manual. Connect cables tightly, and clamp them securely to prevent external forces
from damaging the terminal. Improper electrical connections can overheat and cause fire, and
may also cause shock. All electrical connections must be made according to the Electrical
Connection Diagram located on the panels of the indoor and outdoor units.
• All wiring must be properly arranged to ensure that the control board cover can close properly. If
the control board cover is not closed properly, it can lead to corrosion and cause the connection
points on the terminal to heat up, catch fire, or cause electrical shock.
• If connecting power to fixed wiring, an all-pole disconnection device which has at least 1/8"
(3mm) clearances in all poles, a leakage current that may exceed 10mA, a residual current
device(RCD) that has a rated residual operating current not exceeding 30mA, and a
disconnection must be incorporated in the fixed wiring in accordance with the wiring rules.
• Only connect the unit to an individual branch circuit. Do not connect another appliance to
that circuit.
• No other equipment should be connected to the same power circuit.
• Power voltage should be within 90-110% of rated voltage. Insufficient power supply can cause
malfunction, electrical shock, or fire.
• Installation of an external surge suppressor at the outdoor disconnect is recommended.
• The air handler’s circuit board (PCB) is designed with a fuse to provide over current protection.
The specifications of the fuse are printed on the circuit board.
• Do not let wires touch or rest against refrigerant tubing, the compressor, or any moving parts
within the unit.
• To avoid getting an electric shock, never touch the electrical components soon after the power
supply has been turned off.
• After turning on the power, always wait 10 minutes or more before you touch the
electrical components.
• Make sure that you do not cross your electrical wiring with your signal wiring. This may cause
distortion, interference or possibly damage to circuit boards.
• Connect the outdoor wires before connecting the indoor wires.
WARNING
Before performing any electrical or wiring work, turn off the main power to the
system.
Electrical Safety

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• Installation must be performed by an authorized dealer or specialist. Defective installation can
cause water leakage, electrical shock, or fire.
• Installation must be performed according to the installation instructions. Improper installation
can cause water leakage, electrical shock, or fire. (In North America, installation must be
performed in accordance with the requirement of NEC and CEC by authorized personnel only.)
• Contact an authorized service provider for repair or maintenance of this unit. This appliance shall
be installed in accordance with national wiring regulations.
• Only use the included accessories, parts, and specified parts for installation. Using non-standard
parts can cause water leakage, electrical shock, fire, and can cause the unit to fail.
• Install the unit in a firm location that can support the unit’s weight. If the chosen location cannot
support the unit’s weight, or the installation is not done properly, the unit may fall and cause
serious injury and damage.
• Install drainage piping according to the instructions in this manual. Improper drainage may
cause water damage to your home and property.
• For units that have an auxiliary electric heater, do not install the unit within three (3) feet of any
combustible materials.
• Do not install the unit in a location that may be exposed to combustible gas leaks. If combustible
gas accumulates around the unit, it may cause fire.
• Do not turn on the power until all work has been completed.
• When moving or relocating the air handler, consult experienced service technicians for
disconnection and re-installation of the unit.
• Excessive Weight Hazard - Use two (2) or more people when moving and installing the unit.
Failure to do so can result in back or other type of injury.
Installation Safety

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Your air handler is designed to operate in the following indoor and outdoor temperatures. When
your air handler is used outside of the following temperature ranges, certain safety features may
activate and turn off the unit to protect it from damage.
TEMPERATURE RANGES
COOL mode HEAT mode DRY mode
Indoor Air
Temperature
60°F - 90°F
(16°C - 32°C)
32°F - 86°F
(0°C - 30°C)
50°F - 90°F
(10°C - 32°C)
Outdoor Air
Temperature
5°F - 122°F
(-15°C - 50°C)
-13°F - 75°F
(-25°C - 24°C)
32°F - 122°F
(0°C - 50°C)
To further optimize the performance of your unit, do the following:
• Keep doors and windows closed.
• Limit energy usage by using TIMER ON and TIMER OFF features.
• Do not block air inlets or outlets.
• Regularly inspect and clean air filters.
OPERATING TEMPERATURES
NOTE
Keep the room's relative humidity below 80%. If the air handler operates in excess of this,
the surface of the air handler may attract condensation. To help prevent condensation
from forming and dripping, set the vertical airflow louver to its maximum angle (vertically
to the floor) and set the fan to HIGH.
NOTE
Your Durastar air handler's outdoor unit is equipped with a base pan heater, allowing it
to continue to operate at freezing temperatures as low as -13°F (-25°C). When outdoor
air temperatures are at or below 32°F (0°C), we strongly recommend keeping the unit
plugged in at all times to ensure smooth ongoing performance.

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INCLUDED INSTALLATION ACCESSORIES
The air handler system comes with the following accessories.
FIELD SUPPLIED INSTALLATION ACCESSORIES
The following installation accessories may be required and must be purchased separately.
• Refrigerant piping (line set)
• 3/8 Bi-flow Drier
• Indoor and outdoor connection/ thermostat wire
• Outdoor power supply cord and disconnect
• Drain pipe
• Pipe and cable wrapping tape
• Wall hole sleeve and cover
• Unit pad or wall bracket
• Wiring u-lugs
Accessory Quantity Image Accessory Quantity Image
Installation
Manual 1Drain Joint Seal 1
Drain Joint 1 Rubber Foot 4
Braze To Flare
Adapter 2
ACCESSORIES
TOOLS NEEDED (OPTIONAL)
The following tools are required for installation.
• Phillips screwdriver
• Drill with 2 1/2" or 3 1/2" hole saw bit (depends on line set size)
• Vacuum pump
• HVAC manifold gauge set
• Micron Gauge
• Refrigerant leak detector
• Copper pipe cutter
• Flaring tool
• Burr reamer
• Crescent or spanner wrench
• Hexagonal wrench set
• Torque wrench
• Multimeter
• Electroprobe
• Level
• Hammer
• Wire strippers
• Wire crimper

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PARTS IDENTIFICATION
NOTE
Illustrations in this manual are for explanatory purposes. The actual shape of your mini-
split equipment may vary slightly.
Valve Cover
Signal Cable,
Refrigerant Pipes,
and Drain Hose
Wiring Terminal
Air Outlet
Air Inlets
NOTE
The installation must be performed in accordance with the required local and national
standards. The installation may be slightly different in different areas.

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OUTDOOR UNIT INSTALLATION
Installation Instructions
Install the unit following local codes and regulations. These may differ slightly between regions.
STEP 1: SELECT INSTALLATION LOCATION
Before installing the outdoor unit, you must choose an appropriate location. The following are
standards that will help you choose an appropriate location for the unit.
DO NOT install unit in the following locations:
• Near an obstacle that will block air inlets and outlets.
• Near a public street, crowded areas, or where noise from the unit will disturb others.
• Near animals or plants that will be harmed by hot air discharge.
• Near any source of combustible gas.
• In a location that is exposed to large amounts of dust.
• In a location exposed to an excessive amount of salty air.
NOTE
Where snowfall is anticipated, raise the unit above the base pad to prevent ice buildup
and coil damage. Mount the unit high enough to be above the average accumulated
area snowfall. The minimum height must be 18 inches.
>4” (101mm)
>24” (610mm)
>24” (610mm)
>4” (101mm) >24” (610mm)
>4” (101mm)
>24” (610mm)
>24” (610mm)
>4” (101mm)
>24” (610mm)
Proper installation locations meet the following standards:
• Meets all spatial requirements shown in installation space requirements above.
• Good air circulation and ventilation.
• Firm and solid location —the location can support the unit's weight and will not vibrate.
• Noise from the unit will not disturb others.
• Protected from prolonged periods of direct sunlight or rain.

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Special considerations for extreme weather
If the unit is exposed to heavy wind, install the unit so that the air outlet fan is at a 90° angle to
the direction of the wind. If needed, build a barrier in front of the unit to protect it from extremely
heavy winds. See figures below.
If the unit is frequently exposed to heavy rain or snow
Build a shelter above the unit to protect it from rain or snow. Be careful not to obstruct airflow
around the unit.
STEP 2: INSTALL THE DRAIN JOINT
1. Fit the rubber seal on the end of the drain joint that will connect to the outdoor unit.
2. Insert the drain joint into the hole in the base pan of the unit.
3. Rotate the drain joint 90° until it clicks in place facing the front of the unit.
4. Connect a drain hose extension (not included) to the drain joint to redirect water from the unit
during heating mode.
Strong
wind
Strong wind
Strong wind
Wind Baffle
Seal
Drain joint
(A) (B)
Base pan hole of
outdoor unit
Seal
NOTE
In cold climates, make sure that the drain hose is as vertical as possible to ensure swift
water drainage. If water drains too slowly, it can freeze in the hose and flood the unit.

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Anchoring the Unit
The outdoor unit can be anchored to the ground or to a wall-mounted bracket (sold separately)
with bolts (M10). Mount the unit on a cement slab, condenser mounting pad, or other level surface
able to support the unit's weight. Do not place the unit directly on the ground. If using a wall-
mounting bracket, make sure the attached structure can support at least four times the unit's
weight.
Unit Mounting Dimensions
The distance between their mounting feet varies by outdoor unit. Prepare the installation base of
the unit according to the dimensions below. In most cases, it may be easier to place the outdoor
unit in its correct location and mark the exact placement for the anchor holes.
W
H
W
H
D
A
B
Front View Top View
OUTDOOR UNIT DIMENSIONS MOUNTING DIMENSIONS
MODEL
W H D A B
inch mm inch mm inch mm inch mm inch mm
DRA1U30S1A 37-1/4 946 31-15/16 810 16-3/16 410 26.5 673 5-7/8 403
DRA1U36S1A 37-1/4 946 31-15/16 810 16-3/16 410 26.5 673 5-7/8 403
DRA1U48S1A 37-1/2 952 52-1/2 1333 16-3/8 415 24 634 15-15/16 404
DRA1U60S1A 37-1/2 952 52-1/2 1333 16-3/8 415 24 634 15-15/16 404
STEP 3: MOUNT THE OUTDOOR UNIT
NOTE
The unit should be mounted or raised above the maximum snowfall depth of the region.

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Installing multiple outdoor units
If installing multiple outdoor units, refer to the diagram below for proper airflow clearances. Please
note it is still recommended to leave 24" between units for service.
L ≤ H L ≤ 1/2H
L A
≥9-13/16” (250mm)
1/2H < L ≤ H ≥11-13/16” (300mm)
L > H Can not be installed
H = Outdoor unit height
L = Wall / Obstruction height
A = Required distance between unit and wall / obstruction
L
H
≥118” (3000mm)
A
≥59”
(1500mm)
250m
≥9-13/16”
( m)
(6 )
≥23-5/8”
00mm
250m
≥9-13/16”
( m)
REFRIGERANT PIPING CONNECTION
WARNING
When connecting refrigerant piping, do not let substances or moisture other than
specified refrigerant enter the unit or pipes. Run nitrogen through the refrigerant
tubing when brazing to avoid carbon build up. The presence of foreign materials will
lower the unit's capacity and can cause abnormally high pressure in the refrigeration
system. This can result in explosion and personal injury.
All field piping must be completed by a licensed technician and must comply with the local and
national regulations.
In the event of refrigerant leakage, measures should be taken to prevent the refrigerant
concentration in the room from exceeding the safe limit. If the refrigerant leaks and its
concentration exceeds its proper limit, hazards due to lack of oxygen may result. Ventilate the
area immediately.

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REFRIGERANT PIPE LENGTH
The length of refrigerant piping will affect the performance and efficiency of the unit. Nominal
efficiency is tested with a pipe length of 25 feet (7.6 meters). A minimum pipe run of 10 feet (3
meters) is required to minimize vibration and excessive noise.
ADDING ADDITIONAL REFRIGERANT
Each outdoor unit is factory charged with enough refrigerant to support up to 25' (7.5m) per zone.
This is based on a one way liquid line measurement from the outdoor unit to the indoor unit.
Systems with line sets that exceed this length will require additional refrigerant (see the following
chart). The refrigerant should be charged from the service port on the outdoor unit's low pressure
valve. Additional refrigerant information can be found in the SUBMITTAL DOCUMENTS at
WWW.SERVICE.DURASTAR.COM. Additional refrigerant can be calculated using the following
chart and formula: (Actual pipe length - Standard pipe length) x Additional Refrigerant Charge
Refrigerant Piping Specifications
Capacity
Refrigerant
Connection
Size
Standard
Length w/
Precharged
Refrigerant
Additional
Refrigerant
Charge
Maximum
Length of
Piping
Maximum Rise
Length
in (L x G) ft (m) oz/ft (g/m) ft (m) ft (m)
k / x /   ( . ) . ()  ()  ()
k / x /   ( . ) . ()  () . ()
k / x /  ( . ) . ()  () . ()
k / x/   ( . ) . ()  () . ()
NOTE
Adapters are included with the indoor unit and outdoor unit to convert the flared fittings
to brazed if necessary.
WARNING
DO NOT mix refrigerant types.

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Unit > 36k then 32ft (10m)
Unit < 36k then 20ft (6m)
Indoor unit/
Outdoor unit
Indoor unit/
Outdoor unit
Unit > 36k then 32ft (10m)
Unit < 36k then 20ft (6m)
Suction Line
Liquid Line
Oil Trap
CAUTION
If oil flows back into the outdoor unit’s compressor, this might cause liquid
compression or deterioration of oil return. Oil traps in the rising gas piping can
prevent this.
OIL TRAPS
Oil traps are necessary for the continued performance of the system if the indoor and outdoor
units are installed at significantly different heights.
If the unit is less than 36000Btu/h an oil trap should be installed every 20ft (6m) of vertical
suction line rise.
If the unit is greater than 36000Btu/h an oil trap should be installed every 32.8ft (10m)of vertical
suction line rise.

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REFRIGERANT PIPE CONNECTION INSTRUCTIONS
STEP 1: CUT PIPES
When preparing refrigerant pipes, take extra care to cut and flare them properly. This will ensure
efficient operation and minimize leaks and the need for future maintenance.
1. Measure the distance between the indoor and outdoor units.
2. Using a pipe cutter, cut the pipe length a little longer than the measured distance.
3. Make sure that the pipe is cut at a perfect 90 angle.
4. Do not damage, deform, or dent the pipe while cutting.
Oblique Rough Warped
90°
STEP 2: REMOVE BURRS
Burrs can affect the airtight seal of the refrigerant piping connection and must be completely
removed.
1. Hold the pipe at a downward angle to prevent burrs from falling into the pipe.
2. Using a reamer or deburring tool, remove all burrs from the cut section of the pipe.
Pipe
Reamer
Point downward

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STEP 3: FLARE PIPE ENDS
Proper flaring is essential to achieve an airtight seal.
1. After removing burrs from cut pipe, seal the ends with PVC tape to prevent foreign materials
from entering the pipe.
2. Sheath pipe with insulating material.
3. Place flare nuts on both ends of the pipe. Make sure they are facing in the right direction as
you cannot change their orientation after flaring.
Flare nut
Copper pipe
4. Remove PVC tape from ends of pipe when ready to perform flaring.
5. Clamp flare form on the end of pipe. The end of the pipe must extend beyond the edge of the
flare form in accordance with the pipe extension table on the next page.

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PIPE EXTENSION BEYOND FLARE FORM
Outer Diameter of Pipe
Inches (mm)
"A" Minimum Extension
Inches (mm)
"A" Maximum Extension
Inches (mm)
 3/8" (9.5mm) 0.04" (1.0mm) 0.063" (1.6mm)
 3/4" (19.1mm) 0.078" (2.0mm) 0.094" (2.4mm)
 7/8" (22.0mm) 0.078" (2.0mm) 0.094" (2.4mm)
Flare form
Pipe
A
6. Place flaring tool onto the form.
7. Turn the handle of the flaring tool clockwise until the pipe is fully flared.
8. Remove the flaring tool and flare form, then inspect the pipe for cracks and even flaring.
STEP 4: CONNECT PIPES
When connecting refrigerant pipes, be careful not to use excessive torque or to deform the piping
in any way. You should first connect the low-pressure pipe, then the high-pressure pipe.
When bending connective refrigerant piping, the minimum bending radius is 4 inches (10cm). Do
not leave coils in the refrigerant line sets. Remove excess line length to ensure proper system
operation.
CONNECTING PIPING TO INDOOR UNIT
1. Align the center of the two pipes that you will connect.
Manifold Gauge
Low pressure
gauge
Low pressure
valve
High pressure
valve
Low pressure hose
Auxiliary hose
Vacuum pump
Low pressure valve
Flare nut
Cap
Valve body
Valve stem
Radius ~4” (10cm)
WARNING
Do not leave coils in the refrigerant line sets. All excess line length must be removed
to ensure proper system operation.
TIP: THICKNESS COMPARISON
• 0.0275" = A Thumbnail
• 0.04" = A Dime
• 0.078" = A Nickle
NOTE
It is advised to install a 3/8 bi-flow drier on the liquid line near the indoor unit.

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2. Tighten the flare nut as tightly as possible by hand.
3. Using a spanner, grip the nut on the unit tubing.
4. While firmly gripping the nut on the unit tubing, use a torque wrench to tighten the flare nut
according to the torque values in the table below. Loosen the flaring nut slightly, then tighten
again.
Outer Diameter of
Pipe Inches (mm)
Tightening Torque
lb-ft (Nm)
Flare Dimension "B"
Inches (mm)
Flare Shape
 3/8" (9.5mm) 23.6~28.8 (32~39) 0.52~0.53 (13.2~13.5)
R 0.4~0.8
45°±2
90
°
±4
B
 3/4" (19.1mm) 49.4~74.5 (67~101) 0.91~0.93 (23.2~23.7)
 7/8" (22.0mm) 62.7~81.1 (85~110) 1.04~1.06 (26.4~26.9)
CONNECTING PIPING TO OUTDOOR UNIT
1. Remove the valve cover on the side of the outdoor unit.
2. Remove the protective caps from the ends of the valves.
3. Align flared pipe end with each valve and tighten the flare nut as tightly as possible by hand.
4. Using a spanner, grip the body of the valve. Do not grip the nut that seals the service valve.
5. While firmly gripping the body of the valve, use a torque wrench to tighten the flare nut
according to the correct torque values in the table above.
6. Loosen the flare nut slightly, then tighten again.
7. Repeat steps 3-6 for the remaining pipe.
Valve cover
WARNING
Do not use excessive torque. Excessive force can break the nut or damage the
refrigerant piping. You must not exceed the torque requirements shown in the table
above.

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SYSTEM EVACUATION
PREPARATIONS AND PRECAUTIONS
Air and foreign matter in the refrigerant system can cause abnormal rises in pressure, which can
damage the air handler, reduce energy efficiency, and cause injury. Use a vacuum pump and
manifold gauge to evacuate the refrigerant system, removing any non-condensible gas and
moisture from the system. Evacuation should be performed upon initial installation and if unit is
relocated.
BEFORE PERFORMING EVACUATION
1. Check to make sure the refrigerant pipes connecting the indoor and outdoor units are
connected properly and leak free.
EVACUATION INSTRUCTIONS
1. Connect the charge hose of the manifold gauge to service port on the outdoor unit’s low
pressure valve.
2. Connect another charge hose from the manifold gauge to the vacuum pump.
3. Open the Low Pressure side of the manifold gauge. Keep the High Pressure side closed.
4. Tighten refrigerant valve caps hand tight plus flat to ensure there are no vacuum leaks.
5. Turn on the vacuum pump to evacuate the system.
6. Run the vacuum for at least 15 minutes until the meter reads -76cmHG(-10 Pa) or 500 microns.
(the time will depend on the vacuum pump used)
7. Close the low pressure side of the manifold gauge, and turn off the vacuum pump.
8. Wait for 5 minutes, then check that there has been no change in system pressure.
9. If there is a change in system pressure, check to make sure the brazed and flare fittings are
sealed and refer to Gas Leak Check section. If there is no change in system pressure, you can
proceed.
10. If each unit is shipped with 25ft (7.6m) of refrigerant. If more is necessary, add it through the
low pressure service port on the unit.
11. After additional refrigerant is added if necessary, remove the charge hose from the service
port and unscrew the cap from the high pressure valve on the unit.
Outdoor unit
Compound
gauge
-76cmHg
Low
pressure
valve
High
pressure
valve
Pressure hose
or
Charge hose
Vacuum
pump
Pressure
gauge
Low pressure
valve
Charge
hose
Manifold
Gauge
Flare nut
Cap
valve body
valve stem