Gree MULTI21 CAS12HP230V1AC User manual

CEILING CASSETTE
INSTALLATI N MANUAL
Models:
CAS12HP230V1AC
CAS18HP230V1AC
CAS24HP230V1AC

Table of Contents
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
omenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Suggested Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
System Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation Site Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Indoor Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
Indoor Unit Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Piping Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
Power & Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-16
Controller Installation and Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Fresh Air Intake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Decorative Grille Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Testing and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Diagnostic Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22-25
Installation Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Back
Thank you for choosing a
Multi21 Ceiling Cassette Ductless
Heat Pump System for your customer.
Please read this installation manual carefully before installing and starting up
the Ceiling Cassette Ductless System. Take a moment to fill out the product and
installation form on the back cover. Retain both the manual and installation
record for future reference.

SAFETY PRECAUTI NS
Please read the following before installation.
This is the safety alert symbol. It is used to alert you to potential
personal injury hazards. Obey all safety messages that follow this
symbol to avoid possible injury or death.
This mark indicates procedures which, if improperly performed,
might lead to the death or serious injury of the user.
This mark indicates procedures which, if improperly performed, might
possibly result in personal harm to the user, or damage to property.
otice is used to address practices not related to personal injury.
General Safety Precautions
1. Instructions for installation and use of this product are provided by the manufacturer.
For proper operation, the system must be installed in accordance with this
installation manual.
2. Installation must be performed in accordance with local laws, regulations and
ational Electrical Codes ( EC).
3. If there is a refrigerant leak while work is being carried out, ventilate the area.
Do not allow refrigerant to come in contact with a flame as it produces toxic gas.
4. Disconnect all electrical power to the indoor and outdoor units until the system is
ready for start-up and checkout.
5. When installing or repairing the system, use only R410A refrigerant. Do not
mix refrigerant with other gases. If air or other gas enter the refrigeration system,
the pressure inside the system may rise to an abnormally high value and cause
damage or injury.
This appliance is not intended for use by persons (including children) with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless they have been given
supervision or instruction concerning use of the appliance by a person responsible for their safety.
WARNING
CAUTION
NOTICE
WARNING
2

N MENCLATURE
Cooling Capacity
12 - 12,000 BTUH
18 - 18,000 BTUH
24 - 24,000 BTUH
Series Designation
Revision Level
Style/Color Designation
Product Type
S- System
O - Outdoor units
H- Indoor High Wall
D- Indoor Duct
C - Indoor Cassette
F - Indoor Floor/Ceiling
Electrical Rating
230V - 208/230V 60Hz 1PH
Model Type
AC - Cooling Only
HP - Heat Pump
HC - Heat/Cool 115V - 115V 60Hz 1PH
Example: CAS18HP230V1AC
CCAS 18 HP 230V 1 A
CAS - Ceiling Cassette
3
SYSTEM REQUIREMENTS
PIPE SIZE in (mm)
Condensate Drainage
It is recommended that condensate drainage systems use pipe either the same diameter
or larger (excluding the raising section) than that of the connecting pipe. The unit condensate
port is 1.2 in. (31mm) outside diameter.
Interconnecting Cable
The ceiling cassette unit is powered from the outdoor unit. Use recommended 14/4 AWG
stranded bare copper conductors THH 600V unshielded wire.
Unit Size (BtuH)
12,000 1/4 (6) 3/8 (9.5) 44/51 lbs.
18,000 1/4 (6) 1/2 (12) 48/55 lbs.
24,000 3/8 (9.5) 5/8 (16) 66/84 lbs.
Net/Gross Weight
Liquid Line Suction/Gas Line
N TE: Insulate all condensate drain pipes to prevent sweating and possible water damage.
N TE: Use shield cable if installation is in close proximity of RF and EMI transmitting devices.

• Standard Wrench
• Adjustable/Crescent Wrench
• Torque Wrench
• Hex Keys or Allen Wrenches
• Drill & Drill Bits
• Hole Saw
• Pipe Cutter
• Screw drivers (Phillips & Flat blade)
• Manifold and Gauges
• Level
• R410A Flaring Tool
• Clamp on Amp Meter
• Vacuum Pump
• Safety Glasses
• Work Gloves
• Refrigerant Scale
• Micron Gauge
SUGGESTED T LS
4

SYSTEM PARTS
Indoor unit
Part Name
1. Power Supply and
Communication Wires
2. Drain Pipe
3. Liquid Pipe
4. Decorative Discharge Air
Grille (sold separately)
5. Gas Pipe
6. Wired Tether Controller
7. Remote Controller
8. Service Cover
9. Power Supply and
Communication Wires
10. Front Panel
11. Outdoor Power Supply
12. Liquid Pipe
13. Gas Pipe
14. Drain Hose
utdoor Unit
Air outlet
Air inlet
1
2
5
4
3
67
Air outlet
Air inlet
14 12 11 10
The refrigerant pipe, drain pipe and electrical wiring for this unit should be
installed by a qualified HVAC professional only.
CAUTION
98
13
5
Part Numbers Description
CASGRILLE1SM Decorative Grille for 12,000 & 18,000 BTU Cassettes
CASGRILLE1LG Decorative Grille for 24,000 BTU Cassette
MC20700140 XK-19 Wired Tether Controller with touch buttons.

INSTALLATI N SITE INSTRUCTI NS
Indoor Unit
The unit must be installed in a location which can withstand four times the weight of the unit.
Inadequate support may result in serious property damage and injuries.
Select a site that allows for the following:
•Ensure the installation complies with the installation minimum dimensions and meets the
minimum and maximum connecting piping length and maximum change in elevation.
• Air inlet and outlet should be clear of obstructions, ensuring proper airflow throughout the room.
• Condensate can be easily and safely drained.
• All connections can be easily made to outdoor unit.
• Indoor unit is out of reach of children.
• A structure strong enough to withstand four (4) times the full weight and vibration of the unit.
• Filter can be easily accessed for cleaning.
• Leave enough free space to allow access for routine maintenance.
• Do not install in a laundry room or by a swimming pool due to chemicals corroding cassette coil.
6
WARNING
Minimum Indoor Clearances

7
IND R UNIT DIMENSI NS
12-18K Indoor Unit Dimensions
Model Suction/Gas Line Liquid Line Drain Line
Port Size Port Size Connection
12,000 3/8-in OD Flared 1/4-in OD Flared 1.2-in OD
18,000 1/2-in OD Flared 1/4-in OD Flared 1.2-in OD

IND R UNIT DIMENSI NS
Hanger Bolts Distance 22.5in (570mm)
Hanger Bolts Distance 23.75in (604mm)
Ceiling Center Point
Ceiling Center Point
Laying ut Indoor Location
• Locate the factory supplied installation template included in carton.
• Use the template to make an opening in the ceiling for the ceiling cassette main body.
• Mark the position of the 4 hanger bolts, refrigerant lines and condensate drain pipes.
8
24K Indoor Unit Dimensions
Suction/Gas Line Liquid Line Drain Line
Port Size Port Size Connection
5/8-in OD Flared 3/8-in OD Flared 1.2-in OD

Threaded
Hanger Bolt
Washer
Nut
Washer
Nut
Nut
IND R UNIT INSTALLATI N
Indoor Unit Hanger Mounting
Depending on the type of ceiling, attach the threaded hanger bolts securely to the support stud. Before
lifting the indoor unit to the installation location, insert the upper nuts, flat washers (with insulation),
flat washers (without insulation), lower nuts and double locking nuts on the threaded hanger bolts.
Lift the Ceiling Cassette main body to the threaded hanger bolts. Insert the unit mounting brackets
between washers and then fasten it securely.
N TE: The hanger bolts, nuts, and washers are field supplied. Install the washer with
cushion so that the insulation faces downward.
1. Adjust the height of the Indoor Unit main body to align with false ceiling. Be sure to confirm
this, otherwise condensation may form during cooling mode. Adjust mounting nuts as needed.
2. Confirm that the indoor unit main body is level. Adjust mounting nuts as needed.
3. After checking the positioning of the indoor unit main body, tighten the nuts of the hanger
bolts securely to fasten the Indoor Unit main body in place.
Confirm the position of the Indoor Unit
Installation of Ceiling Cassette
Flat washer
Hanging bolt
ut
Flat washer
ut
9

Piping Preparation
1. Do not open service valves or remove protective caps on pipes until instructed by this manual.
2. Keep tubing free of dirt, sand, moisture and contaminants.
3. Insulate each refrigerant pipe and condensate hose with minimum 3/8” (10 mm) wall
thermal pipe insulation.
4. Bind refrigerant pipes and communication cable together with cable ties at 12-inch intervals.
5. Include the condensate hose in bundle for exterior portion only.
10
PIPING INSTALLATI N
Refrigerant Piping
Drill Hole in Wall
1. Locate and mark proper location for the wall hole.
2. Cut the 2 3/4” wall hole with a 5° to 10°
downward slant to the outdoors.
3. Insert a wall sleeve (field supplied) into hole to
to prevent damage to refrigerant pipes, insulation,
condensate drain hose and wiring.
4. Proper weather proofing of the wall surface and
wall sleeve is essential to assure a trouble-free
installation. Apply sealant, caulking or equivalent
weather proofing material around the perimeter of
the wall sleeve (interior & exterior) to eliminate
outdoor air and water leaks into the indoor space.
N TE: Expandable foam insulation may be added to fill large wall gaps.
Apply per manufacturer's instructions.
Seal Hole
Hole Size
Indoor Outdoor
Wall Hole Diagram
Oil return bend
Indoor
Outdoor
20 ft. 30 ft.
Oil return bend
Indoor Unit below utdoor Unit Application
When height difference between indoor unit and outdoor
unit is more than 30 feet, an oil return bend should be added
for every 20 feet of connection pipe as shown.
Wall
Hole Sleeve
Unit Size Wall Hole Size
(BtuH) Dia - inch (mm)
12,000 2 1/4 (55)
18,000 2 3/4 (70)
24,000 2 3/4 (70)

11
PIPING INSTALLATI N
Connecting Refrigerant Pipes to Ceiling Cassette
1. Feed refrigerant pipes, drain hose and communication cable assembly through wall hole
from outdoor to the Ceiling Cassette.
2. Pull the piping assembly to the indoor unit. Carefully bend refrigerant pipes to meet indoor
unit connection ports. Use proper tools to avoid kinks.
3. Add a small amount of refrigerant oil to both ends of the flare fittings.
4. Properly align piping and tighten flare nut using a standard wrench and a torque wrench as
shown in figure to the below. Carefully tighten flare nuts to correct torque level referring to
the illustration and Torque Table below:
5. Individually insulate each bare refrigerant pipe and joint as shown below to prevent sweating.
Gas pipe
3-way valve
Reference A:
Reference A:
Cover this portion with insulation
Pipe insulation
Liquid pipe
Gas pipe
Front outlet
Insulate pipe connection
Insulate pipe
Insulate pipe
2-way valve
Liquid pipe
or
Pipe
coupling
Gas pipe
3-way valve
Reference A:
Reference A:
Cover this portion with insulation
Pipe insulation
Liquid pipe
Gas pipe
Front outlet
Insulate pipe connection
Insulate pipe
Insulate pipe
2-way valve
Liquid pipe
or
Pipe
coupling
Over tightening may damage flare connections and cause leaks.
WARNING
CAUTION
WARNING
CAUTION
Ceiling Cassette Unit
Indoor Unit PipingTaper ut
WrenchTorque Wrench
Piping
Pipe Diameter Nut Size Tightening Torque
inch (mm) inch (mm) ft-lbs N-m
1/4 (6.35) 1/4 (17) 10 to 13 14 to 18
3/8 (9.5) 3/8 (22) 25 to 30 34 to 42
1/2 (12.7) 1/2 (25) 36 to 45 49 to 61
5/8 (15.9) 5/8 (29) 50 to 60 68 to 82

12
Indoor Condensate Drain Piping
PIPING INSTALLATI N
Observe all local sanitary codes when installing condensate drains.
WARNING
CAUTION
WARNING
WARNING
It is recommended to install the condensate drain system with hard polyvinyl chloride (PVC) pipe
and matching connectors. Use piping of the same diameter or larger as the unit connection.
The Ceiling Cassette drainage port diameter is 1.2 in. (31mm) OD.
Pitch the condensate drain pipe at a gradual 2.5% pitch (Example: ¼-in drop over a 10-in length)
without obstructions. Use pipe hanger/brackets to support the condensate drain pipe from dropping.
N TE: Insulate condensate hose and/or pipes to prevent sweating which may cause
water stains or wall damage.
The following are recommended gravity drainage systems for the ceiling cassette.
Gravity Drainage Systems
Typical Gravity System
Common Drain Pipe System
with P-Trap and Vent
utdoor Unit Pipe Connections
Carefully bend and adjust length of refrigerant pipes to meet
outdoor unit port connections. See installation instructions
shipped with the outdoor unit for further instructions..

PIPING INSTALLATI N
If a gradual pitch from the drainage port is not obtainable, the Ceiling Cassette contains an internal
condensate drain pump with limited head or lift. The condensate drain pipe may have a vertical height of
11-in. (280mm) maximum above the unit drainage port within the first 12-in as long as the remaining
condensate drain pipe gradually descends from that point and is aligned with drainage port.
Use an auxiliary condensate pump with float valve for vertical height greater than of 11-in.
(280 mm) above the unit drainage port. A float valve is recommended to shut off the system if
the auxiliary pump fails.
Vertical Lift Drainage System
Sealed
Drain
pipe
Clamps
Trap
Completing Condensate Drainage Piping
•Include the exterior section of condensate hose in the
pipe/wire bundle.
•Fasten the refrigerant and condensate pipe assembly to
the exterior wall for support.
•The drain pipe should terminate 6 inches above grade.
13

P WER AND WIRING INSTALLATI N
WARNING
CAUTION
WARNING
WARNING
1. Before obtaining access to wire terminals, all electrical supply circuits must be
disconnected, locked out and tagged.
2. Always use an independent (dedicated) circuit and provide an independent (dedicated)
circuit breaker to supply power to the system.
3. Use a circuit breaker with adequate capacity to meet the requirements of the total system.
4. All circuit breakers or fuses for the indoor and outdoor units should be installed per the
ational Electric Code ( EC) and local regulations.
5. Electrical wiring must be completed in accordance with EC, local laws, and regulations
of the electric company so that the system will operate properly.
6. Provide a GFI circuit breaker at the electrical panel in accordance with the EC and the
local electrical company standards.
7. Connect the power supply firmly to the terminal block. Improper installation may
cause a fire.
WARNING
CAUTION
WARNING
CAUTION
1. The main power supplies are high-voltage, while the communication wire and the Tether
Controller are low-voltage. They should be installed separately to avoid electromagnetic
interference.
2. High-voltage and low-voltage lines should pass through separate rubber rings at electric
box covers.
3. If the indoor unit communication wire (to the outdoor unit) and power wire are connected
incorrectly, the air conditioner may be damaged.
4. Ground both indoor unit and outdoor unit to earth ground in accordance with the applicable
local and national codes.
14

15
P WER AND WIRING INSTALLATI N
Electrical Connections to Ceiling Cassette
Disconnect all electrical power to indoor and outdoor units including disconnects,
fuses and circuit breakers. Lockout and tag all disconnect switches.
Electric Wiring Between Indoor Unit and utdoor Unit
G
Power:
Wired Tether
Controller
XK-19
NN((11))
22
3
3
CN1CN1
22
3
3
NN((11))
CN9CN9
Screw with
special washer Screw with
special washer
Round
terminal Round
terminal
Terminal
board
Insulation tube
Insulation tube
Wire clamp
Wire
Wire
Cassette Unit
Typical Wiring Diagram
1. Adjust the length of the interconnecting wires so that it can easily reach the Ceiling Cassette
electrical control box.
2. Open electrical control box cover and route the interconnecting wires to field wiring terminal block.
N TE: The indoor unit is powered from the outdoor unit, depending on local code, a
disconnect switch may need to be installed to a power supply circuit.
3. Secure interconnecting wires to the terminal block
as shown in the connection diagram at right:
N TE: Record wire colors and terminal references
for uses with Outdoor Unit wire connections.
4. Secure all wires inside wire clamp/strain relief. Verify wires
are secure, not loose and no external force on wires affects
the connections at the terminals.
N TE: Crossing interconnecting wires will cause system malfunction and possible damage.
5. Replace field wiring cover on unit.
WARNING
CAUTION
WARNING
WARNING
utdoor Electrical Wiring
For Outdoor Unit wire connections, see installation instructions shipped with the outdoor unit.
Red
White
Black
Green
Red
White
Black
Green

16
P WER AND WIRING INSTALLATI N
Installing Wired Tether Controller to Ceiling Cassette
1. Open decorative grille and locate 4 pin connector for wired controller on Ceiling Cassette
main body
2. Route wired controller wires to 4-pin connector and connect Tether Controller to ceiling
cassette.
N TE: Use the supplied cable, with OEM plugs on either end. Do not cut or splice.
Conceal any excess cable.
1. Replace decorative grille being careful not to pinch wires.
2. Remove back plate from Wired Controller.
Outdoor Unit
Indoor Unit
Indoor Unit Disconnect Switch
Wires
Outdoor Unit
Local codes may require a disconnect switch within sight of the indoor unit. Use a DFS Disconnect
Switch Accessory Kit (Part o: DFS-SWITCH-A) to break interconnecting wires going to the (1),
2, 3, terminals on the indoor unit, as shown in the wiring diagram below:
Indoor Disconnect Switch ( ptional)
Red
White
Black
Green

17
C NTR LLER INSTALLATI N AND SETUP ( ptional)
The following is a brief overview of the Wired Tether Controller installation. See Tether Controller
Owner's Manual for more detailed instructions for setup and operation.
Preparation for Installation
Select a proper location on the wall for mounting the Tether
Controller. Install switch box, if required by code. The maximum
wire length between indoor and Tether Controller is 26 ft (8m).
Run communication cable (as desired) between indoor unit
and selected wall mounting location. See Indoor Unit wiring
section for instruction to connect the Wired Tether Controller
to the indoor unit.
Wired Tether Controller Installation
Pull communication cable through switch box (if one
is used) and Wired Tether Controller backplate. Securely
fasten backplate to the switch box or wall.
Locate wire terminals connector on rear of Tether
Controller panel. Carefully connect wire to controller
connector. Verify connector is secure, not loose and
no external force on wires affects the connections at
the terminals. Push extra cable into wall and secure
controller panel to backplate mounted on the wall.
N TE: Do not cut or splice communication cable.

18
Connecting Fresh Air Duct
The indoor ceiling cassettes have a fresh air intake port for ventilation. A booster fan and
duct (field supplied) must be used to feed outdoor air to the indoor unit.
Determine the duct diameter, length and booster fan size based on the required airflow.
See table below for duct and hole sizes:
N TE: Fresh air intake amount should be 10% or less of whole air amount to
prevent condensation.
Unit Size Hole Diameter Duct Diameter
(BtuH) inch (mm) inch (mm)
24,000 4.4 (113) 2.9 (73)
To install fresh air intake:
1. Locate and remove the pre-punched knockouts hole for ventilation duct on ceiling cassette unit.
Do not remove the knockout and open the hole at this point.
2. Remove the factory installed insulation on the outside of ceiling cassette where the pre-punched
knockout was located.
3. Install field supplied ductwork. Recommended ductwork is either an insulated flex duct, or
insulated sheet metal duct suitable for working temperatures up to 140° F (60° C).
4. Use a field-supplied power ventilation fan to increase airflow to meet job requirements.
Follow the manufacturer's installation instructions provided with the power ventilation kit.
5. Install a field supplied air filter to prevent dust and dirt from entering the ceiling cassette unit
and fouling indoor coil.
6. Install a field supplied mechanical duct damper to close during shutdown periods.
7. All metal ductwork should be covered with insulation to prevent condensation forming.
Fresh air h le
Fresh air h le
FRESH AIR INTAKE (24K Size nly)

6. Find the four (4) height adjustment screws located on the corners of the decorative grille.
Use the four (4) height adjustment screws to adjust gap between decorative grille and
Ceiling Cassette body so that gap is reduced to 1/4-in (6mm) to 3/8-in (9mm). Make certain
the decorative grille is not distorted by excessive tightening.
DEC RATIVE GRILLE INSTALLATI N
Mounting Decorative Grille
1. Carefully unpack decorative grille and align the
decorative grille to the Ceiling Cassette main body.
2. Temporarily attach the decorative grille to the
ceiling cassette main body at two (2) corner points.
3. Locate the two (2) Swing Louver electrical
connectors on the decorative grille.
4. Connect both Swing Louver connectors on
decorative grille to matching connectors on the
Ceiling Cassette body.
5. Complete the decorative grille attachment by
hooking the remaining two (2) corners to the
Ceiling Cassette main body.
Note: Be careful not to pinch the swing
louver motor wires between the decorative
grille and ceiling cassette main body.
Height adjustment screw
Swing l uver c nnect r
Swing l uver c nnect r
Dec rative grille
Hk & latch
H k & latch
Ceiling Cassette
main b dy
Refrigerant
pipes
H k & latch
Ceiling
Between 1/4-in.
and 3/8-in. Dec rative grille
Ceiling
7. Verify that the seal between decorative grille
and Ceiling Cassette main body is tight all the
way around the unit to prevent air leak. Use the
height adjustment screws to adjust the gap.
1918