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