Gree Terra GWH12TB-D3DNA1A Manual

DUCTLESS HEAT PUMP
Installation, Service & Troubleshooting
Models:
GWH09TB-D3DNA1A
GWH12TB-D3DNA1A
GWH18TC-D3DNA1A
GWH24TD- D3DNA1A

2
Table of Contents
Safety Precautions & Warnings.........................................................................................................................
Model Number Identication............................................................................................................................
Physical & Electrical Data.................................................................................................................................
Product Introduction (System Overview)......................................................................................................
Product Introduction (Refrigeration Cycles).................................................................................................
Indoor & Outdoor Components.......................................................................................................................
Operational Data................................................................................................................................................
Basic Functions 9,000/12,000 btuh Systems....................................................................................................
Basic Functions 18,000/24,000 btuh Systems..................................................................................................
Remote Control Operation................................................................................................................................
Refrigerant Lines, Connection, Evacuating and Charging............................................................................
Installation...........................................................................................................................................................
Filter Maintenance and Emergency Operation..............................................................................................
Electrical Schematics..........................................................................................................................................
Troubleshooting Outdoor Components..........................................................................................................
Fault & Status Displays.......................................................................................................................................
Error Code Diagnostics......................................................................................................................................
Disassembly of Indoor Unit 9,000/12,000 btuh Models................................................................................
Disassembly of Indoor Unit18,000 btuh Model..............................................................................................
Disassembly of Indoor Unit24,000 btuh Model..............................................................................................
Disassembly of Outdoor Unit 9,000/12,000 btuh Models..............................................................................
Disassembly of Outdoor Unit 18,000 btuh Models........................................................................................
Disassembly of Outdoor Unit 24,000 btuh Models........................................................................................
Appendix 1 - 3 Temperature Sensor Resistance Tables..................................................................................
3
4
5 - 6
7
8 - 9
10 - 11
12 - 16
17 - 26
27 - 37
38 - 39
40 - 42
43 - 47
48
49 - 56
57 - 62
63 - 70
71 - 89
90 - 97
98 - 105
106 - 112
113 - 115
116 - 118
119 - 122
123 - 128

3
Installing, starting up, and servicing air conditioner can be
hazardous due to system pressure, electrical components,
and equipment location, etc. Only trained, quali•ed
installers and service personnel are allowed to install, start-
up, and service this equipment. Untrained personnel can
perform basic maintenance functions such as cleaning
coils. All other operations should be performed by trained
service personnel. When handling the equipment, observe
precautions in the manual and on tags, stickers, and labels
attached to the equipment. Follow all safety codes. Wear
safety glasses and work gloves. Keep quenching cloth and
•re extinguisher nearby when brazing. Read the instructions
thoroughly and follow all warnings or cautions in literature
and attached to the unit. Consult local building codes and
current editions of national as well as local electrical codes.
Recognize the following safety information:
Warning: Incorrect handling could result in
personal injury or death.
Caution: Incorrect handling may result in minor
injury, or damage to product or property.
All electrical work must be performed by a qualied,
licensed electrician according to local and national
codes as well mas the instructions provided in the
manual.
• Before installing, modifying, or servicing the
system, the main electrical disconnect must be o.
ere may be more than one disconnect switch.
Lock out and tag switch with a suitable warning
label.
• Never supply power to the unit unless all wir-
ing and tubing are completed, reconnected and
checked.
• is system adopts highly dangerous electrical
voltage. Incorrect connections or inadequate
grounding can cause personal injury or death.
Refer to your local and national codes for proper
grounding.
• Have the unit properly grounded with all connec-
tions tight. Loose connections can cause overheat-
ing and a possible re hazard.
Safety Precautions & Warnings
Warning
!
Warning
!
Caution
!
!
!
• Never install the unit in a place where a combustible
gas might leak, or it may lead to •re or explosion.
• Make a proper provision against noise when the unit is
installed at a telecommunication center or hospital.
• Provide a GFIC circuit when the local or national
electric code requires it.
• Never wash the unit with water.
• Handle unit transportation with care. Use two people
when the weight exceeds the capacity for one person.
• Never touch the heat exchanger •ns with bare hands,
sharp edges could cause personal injury.
• Never touch the compressor or refrigerant tubing
without proper hand protection.
• Do not operate th unit without the air •lters in place.
• Should any emergency occur, stop the unit and
disconnect the electrical supply.
• Properly insulate tubing running inside the room to
prevent water damage from condensation.
Warning
All installation or repair work shall be performed by your
dealer or a specialized subcontractor as there is the risk of
•re, electric shock, explosion or injury
!
Warning
Pressurized Refrigerant
Personal injury could result in failure to follow this warning.
System contain oil and refrigerant under high pressure,
proper refrigerant handling techniques should be
completed by a quali•ed technician.
!
Warning
Live Electrical Components
Personal injury, property damage, or death could result in
failure to follow this warning.
Follow all electrical precautions when servicing this
system, it may be necessary to service or troubleshoot with
live electrical circuits. All work should be completed by a
quali•ed technician.
!

4
Safety Considerations & Warnings
Model Number Identication
G W H 24 TB - D 3 D N A 1 A/I
Gree
Wall Mount
C = Cooling Only
H = Heat Pump
Nominal Capacity
09 = 9,000 BTUH
12 = 12,000 BTUH
18 = 18,000 BTUH
24 = 24,000 BTUH
30 = 30,000 BTUH
36 = 36,000 BTUH
42 = 42,000 BTUH
48 = 48,000 BTUH
Product Series
TERRA - TB/TC/YD
EVO+- AB/AC
NEO - MA/MA/MA/MA/LB
RIO - KF/KG
A = 110v
D = 208/230v
R410a
DC Inverter
T1
Panel No.
Revision No.
I = Indoor Unit
O = Outdoor Unit

5
Model GWH09TB-D3DNA1A GWH12TB-D3DNA1A
System Type Heat Pump
Power Supply 208-230V / 60Hz 208-230V / 60Hz
Rated Current Cooling Amps 5.7 6.0
Rated Current Heating Amps 7.0 7.5
System Performance
Cooling Cap (Min/Max) Btu/h 9,000 (3,500-9,600) 12,000 (3,100-13,000)
Heating Cap (Min/Max) Btu/h 9,800 (2,200-11,000) 13,000 (2,400-14,000)
SEER/EER 27 / 14.5 25 / 12.8
HSPF/COP 9.0 / 3.8 9.0 / 3.5
Indoor Unit
Air!ow
T/H/MH/M/ML/L/mute CFM 418/300/282/247/218/182/118 453/312/288/259/221/182/118
Sound Pressure Level
T/H/MH/M/ML/L/mute dBa 42/38/36/34/30/26/23 44/38/36/34/30/26/24
Unit Size (WxHxD) Inches 34.1 x 11.5 x 8.2 34.1 x 11.5 x 8.2
Package Size (WxHxD) Inches 37.2 x 14.9 x 11.7 37.2 x 14.9 x 11.7
Net/Gross Weight Lbs 24 / 31 24 / 31
Outdoor Unit
Compressor Type DC Inverter-Driven
Sound Pressure Level dBa 49 49
Unit Size (WxHxD) Inches 35.4 x 23.5 x 14.9 35.4 x 23.5 x 14.9
Package Size (WxHxD) Inches 37.3 x 25.4 x 16.5 37.3 x 25.4 x 16.5
Net/Gross Weight Lbs 86 / 90 87 / 92
Refrigerant/Charge Oz. R410A / 45.9 R410A / 45.9
Installation
Line Set Size (Liq-Suc) Inches 1/4” - 1/2” 1/4” - 1/2”
Pre-Charge Feet 25 25
Max Line Run Feet 50 66
Max Elevation Feet 33 33
MCA Amps 10 10
MOCP Amps 15 15
Wire Size to Outdoor
Unit, # of wires AWG 14 14
Wire Size / # Wires AWG 14 / 4 14 / 4
Note: The manufacturer reserves the right to modify the design and/or change the speci"cations without notice. Please
refer to speci"c installation manual for current information.
Physical & Electrical Data, cont.

6
Note: The manufacturer reserves the right to modify the design and/or change the speci•cations without notice. Please
refer to speci•c installation manual for current information.
Model GWH18TC-D3DNA1A GWH24TD-D3DNA1A
System Type Heat Pump
Power Supply 208-230V / 60Hz 208-230V / 60Hz
Rated Current Cooling Amps 7.4 8.5
Rated Current Heating Amps 7.8 10.3
System Performance
Cooling Cap (Min/Max) Btu/h 18,000 (4,600-22,180) 24,000 (6,826-29,352)
Heating Cap (Min/Max) Btu/h 19,000 (3,400-24,900) 25,000 (7,509-37,543)
SEER/EER 21 / 12.0 21 / 12.0
HSPF/COP 9.8 / 3.5 9.2 / 3.3
Indoor Unit
Air!ow
T/H/MH/M/ML/L/mute CFM 588/512/465/418/371/330/282 706/647/589/530/471/412/353
Sound Pressure Level
T/H/MH/M/ML/L/mute dBa 51/48/45/43/39/36/33 52/49/47/45/43/41/38
Unit Size (WxHxD) Inches 40.1 x 12.6 x 9.1 46.4 x 12.8 x 10.4
Package Size (WxHxD) Inches 43.2 x 15.6 x 13.4 49.2 x 16.2 x 14.0
Net/Gross Weight Lbs 31 / 42 40 / 53
Outdoor Unit
Compressor Type DC Inverter-Driven
Sound Pressure Level dBa 56 56
Unit Size (WxHxD) Inches 37.6 x 27.6 x 15.6 38.6 x 31.1 x 16.8
Package Size (WxHxD) Inches 40.5 x 29.5 x 18.0 42.6 x 33.7 x 19.2
Net/Gross Weight Lbs 110 / 121 153 / 164
Refrigerant/Charge Oz. R410A / 56.4 R410A / 77.6
Installation
Line Set Size (Liq-Suc) Inches 1/4” - 5/8” 1/4” - 5/8”
Pre-Charge Feet 25 25
Max Line Run Feet 82 98
Max Elevation Feet 33 33
MCA Amps 15 20
MOCP Amps 25 30
Wire Size to Outdoor Unit, #
of wires AWG 10 10
Wire Size / # Wires AWG 14 / 4 14 / 4
Physical & Electrical Data, cont.

7
e Terra Ductless split heat pumps are a single zone
unit available in size from 9000 btuh to 24, 000 btuh
providing heating and cooling. All comfort settings
are controlled by a remote control. e Terra unit has
many features to enhance comfort and eciency. e
operation of these features will be explained later in
this service manual.
Superior inverter technology is used to control capac-
ity while maintaining maximum eciency. e Terra
systems are equipped with G10 inverter technology
providing precise control over the compressor frequen-
cy based on operating pressures and temperatures.
Should an abnormal condition occur, the soware will
adjust the compressor frequency or shut down the
system indicating the appropriate fault.
e indoor unit contains a digital display, which will
indicate the current fault. e evaporator, swing mo-
tors, fan motors and circuit board are also components
of the indoor unit. e indoor units have a bypass
switch to bypass the remote control if lost or batteries
fail. is will be explained later in this service manual.
e systems require R410A and are pre-charged for 25’
of lineset. Please refer to your installation manual for
additional charge for linesets longer than 25’.
e systems use a PVE oil and should require no ad-
ditional oil. All Terra units utilize an Oil Return Mode
which will return oil to the compressor should the
need arise.
System Overview
Product Introduction
Circuit Board with
G10 Technology
Compressor
Indoor Display

8
Indoor Unit
Outdoor Unit
Heat Exchanger
Heat
Exchanger
Inverter
Compressor
Temperature
Sensor
4-way
Accumulator
Compressor
Refrigeration Components
Product Introduction
High
Pressure
Switch
Temperature
Sensor
Strainer
Note;
Component locations may vary depending on models.

9
Indoor Unit
Outdoor Unit
Heat Exchanger
Heat
Exchanger
Inverter
Compressor
Accumulator not
on all sizes
4-way
valve
Electronic
expansion
valve
Filter
Cooling Mode
A. Hot gas is discharged from the compressor. e temperature of the gas in monitored by the Discharge Tem-
perature sensor and sent to the outdoor control panel.
B. e hot gas is directed through the 4-way valve, then enters the outdoor coil. e hot gas will be slightly sub-
cooled, however there are no pressure ports to take measurements.
C. e subcooled liquid will enter the lter to remove contaminates.
D. e subcooled liquid will enter the Electronic Expansion Valve (EEV) and will be regulated to about a 10 de-
gree F superheat level. e EEV will adjust its ow based upon the temperature sensor readings. e adjust-
ment process and compressor speed are controlled by the outdoor circuit board.
E. e refrigerant leaving the EEV will be in a low pressure/temperature saturated state. is cold saturated re-
frigerant will move through the coil absorbing heat. is liquid will ash to a vapor and will be superheated
to about 10 degrees F. Since this tubing is cold, it must be insulated.
F. e superheated vapor in returned to the outdoor unit’s 4-way valve.
G. e refrigerant will ow to the accumulator (not all models will have an accumulator) where liquid and
vapor are separated.
H. e refrigerant will ow to the compressor and complete another refrigeration cycle.
e control board will monitor the temperature and pressures and adjust the frequency of the compressor and
ow rate of the EEV as needed. ere are no pressure charts to evaluate temperature or pressures.
Temperature
Sensor
Product Introduction

10
Indoor Unit
Outdoor Unit
Heat Exchanger
Heat
Exchanger
Inverter
Compressor
Accumulator not
on all sizes
4-way
valve
Electronic
expansion
valve
Filter
Heating Mode
A. Hot gas is discharged from the compressor. e temperature of the gas in monitored by the Discharge Tem-
perature sensor and sent to the outdoor control panel.
B. e hot gas is directed through the 4-way valve to the indoor coil making the line a hot gas line.
C. e hot gas will enter the indoor coil and condense to a saturated mix as it travel through the coil and will be
slightly subcooled.
D. e refrigerant returns to the outdoor unit through the lter, then trough the EEV reducing the refrigerant
to a low pressure liquid and will maintain 10 degrees F of superheat.
E. e cold refrigerant will travel through the outdoor coil (evaporator) and will pickup heat from the outdoor
air. is will cause the cold saturated refrigerant to ash to a saturated mixture which will be superheated to
10 degrees F.
F. e superheated vapor will travel through the 4-way valve to the accumulator which will prevent liquid
oodback.
G. e superheated gas will enter the compressor for another refrigeration cycle.
e control board will monitor the temperature and pressures and adjust the frequency of the compressor and
ow rate of the EEV as needed. ere are no pressure charts to evaluate temperature or pressures.
Temperature
Sensor
Product Introduction

11
Product Introduction
Indoor Tube ermistor
Horizontal Swing Motor
Vertical Swing
Motor
Step Motor
Ambient
Temperature
Sensor
Indoor Unit Components
Terra 9,000 btuh Indoor Unit
Other Terra models may very slightly.
Indoor Circuit
Board
Fan Motor

12
Product Introduction
Outdoor Unit Components
Terra 9,000 btuh Outdoor Unit
Other Terra models may very slightly.
Compressor
4-way
Accumulator
High
Pressure
Switch
Temperature
Sensor
Strainer
Outdoor Fan Circuit Board
Note;
Component locations may vary depending on models.

13
Product Introduction
Operation Characteristic Curve

14
Product Introduction
Capacity Variation Ratio According to Temperature

15
Operation Data
Notes:
(1) Measure surface temperature of heat exchanger pipe around center of heat exchanger path U-Bend.
(2) Length of connecting tubing = 24.6 .
(3) P = Pressure PSI
T1 = Inlet and Outlet Temperature for Evaporator
T2 = Inlet and Outlet Temperature for Condenser
Product Introduction
Temperature Condition (OF) Model
Pressure
(PSI)
Heat Exchanger
Pipe Temperature Indoor Fan
Mode
Outdoor Fan
Mode
Compressor
Speed
(rps)
Indoor Outdoor T1 (OF) T2 (OF)
80.6/66.6 95/75.2
9K 135 57.2 98.6 Turbo High 46
12K 152 59 98.6 Turbo High 70
18/24K 131-160 46.4-51.8 to
51.6-57.2
167-181.4 to
98.6-118.4 Turbo High 75
Cooling
Temperature Condition (OF) Model
Pressure
(PSI)
Heat Exchanger
Pipe Temperature Indoor Fan
Mode
Outdoor Fan
Mode
Compressor
Speed
(rps)
Indoor Outdoor T1 (OF) T2 (OF)
70/60 47/43 9K 401 113 41 Turbo High 56
12K 308 107.6 41 Turbo High 73
68/59 44.6/42.8 18/24K 319-348 167-181.4
98.6-113
33.8-37.4 to
35.6-42.8 Turbo High 75
Heating

16
Noise Criteria Curve Tables
Product Introduction

17
System Operation 9,000/12,000 btuh Models
Basic Functions
e compressor should stay o for at least 3 minutes before starting the unit. e compressor circuit has a 3 minute delay if
the compressor is de-energized during a run cycle. If the compressor starts from a de-energized cycle, there will be no time
delay. e compressor has a minimum runtime of 6 minutes regardless of room temperature.
1) Cooling Mode
Cooling Process
When the indoor ambient rises 2 F above the preset temperature, the unit will start the cooling cycle. e outdoor fan
and compressor will start. e indoor fan will run continuously at the selected speed. e outdoor unit will monitor the
appropriate temperatures and pressure and adjust the compressor speed and the EEV as required. If the indoor ambient is
> 2 F then the preset temperature, the compressor will increase the frequency; < 2 F the compressor will begin reducing
the frequency. e G10 technology will control compressor speed based on indoor load and compressor amperage. When
the indoor temperature is satis ed, the compressor will stop, then 30 seconds later the outdoor fan will stop.
Evaporator Freeze Protection
e so ware will monitor the indoor evaporator coil form freezing.
e following will occur 6 minutes a er the compressor has been operating in the cooling or dry mode:
If the evaporator temperature drops below 36 F, the compressor will operate at a reduced frequency. If the evaporator
is below 30 F for 3 minutes, the compressor will stop, 30 seconds later the outdoor fan will stop. In cooling mode, the
indoor fan and swing motor will remain on. If the evaporator temperature is >= 50 F and the compressor is o for at least
3 minutes, the compressor will resume its normal operation state.
Overcurrent Protection
e so ware will monitor the compressor current to maintain it in a safety and reliable operating range.
If the total current <= 6 amps, the compressor speed frequency is allowed to increase. If the current >= 7 amps, the
compressor speed frequency will not increase. If the total current >= 8 amps, the unit will operate and decrease the
compressor speed. If the current >= 9 amps, the compressor will stop and the indoor fan will stop a er 30 seconds.
2) Dry Mode
Drying Process
is feature will not take the place of a dehumidi er, it is intended to dry the  ler and slightly cool the air. If the indoor
ambient temperature is greater than the preset temperature, the unit will enter the cooling and drying mode, in which
case the compressor will operate and the indoor fan will run at a low speed. When the indoor ambient temperature is at or
below the preset temperature, the unit will operate in it previous running state. When the indoor ambient drops to more
than 2 F below the preset temperature the compressor will stop running, then 30 seconds later the outdoor fan will stop,
the indoor fan will run at low speed.
- 2F
Product Introduction

18
3)Heating Mode
Heating Process
When the indoor ambient drops 2 F below the preset temperature, the unit will start the heating cycle. e outdoor fan,
compressor and 4-way valve will operate. e indoor fan will operate in the “Cold Air Prevention” mode in which the
indoor fan will have a 2 minute delay aer the call for heating. e indoor evaporator coil temperature must reach 104 F
before the indoor fan will start, this will prevent cold air from discharging from the indoor coil. When the indoor evapo-
rator coil temperature is > 104 F, the indoor fan will operate at low speed for 1 minute. With 1 minute of operation or 2
minutes of no fan operation and the indoor evaporator coil temperature is > 108 F, the indoor fan will operate at its preset
condition.
If the indoor ambient temperature is < 9 F and > 2 F of the preset temperature, the unit will run in its original mode of
operation.
If the compressor is running and the mode is changed from cooling to heating, the 4-way valve will be energized 2-3 min-
utes later.
If the indoor ambient temperature is >= 9 F than the preset temperature, the compressor will stop and the outdoor fan will
stop aer a 30 second delay. e indoor fan will continue to operate at its preset mode.
e G10 technology will determine compressor frequency based on ambient temperatures.
System Operation 9,000/12,000 btuh Models, cont.
+9F
+ 2F
Stop heating
Basic Functions
Product Introduction

19
Defrost Process
1) e unit will enter defrost when the following conditions are met:
A. Outdoor ambient <= 41 F
B. Compressor had accumulated more than 3 hours of operation in heating mode
C. e outdoor coil <= 32 F
Note: e compressor runtime will be cleared when the outdoor ambient is > 41 F or when the compressor has started
up aer changing to cooling or drying mode and defrost has nished. e runtime will not be cleared when the unit has
stopped aer reaching the setpoint temperature, a protection fault or changing to fan mode.
ere are 3 perimeters used in the defrost algorithms, Outdoor ambient(Toutdoorambient), Outdoor tube(Toutdoortube) and
a calculated Tcompensation
Tcompensation is calculated by the following:
D. Aer power-up, for the rst defrost Tcompensation = 32 F
E. Toutdoortube > 36 F then Tcompensation = 32 F
F. Toutdoortube <= 36 F then Tcompensation = 37 F
2) When heating has operated continuously for 45 minutes, or accumulated for 90 minutes, the unit will enter defrost
mode in 3 minutes aer meeting any of the conditions below:
A. Outdoor ambient >= 41 F and outdoor coil <= 28 F
B. 28 F <= Toutdoorambient< 41 F, Toutdoortube <= 21 F
C. 23 F <= Toutdoorambient < 28 F <= Toutdoortube <= 18 F
D. 14 F <= Toutdoorambient < 23 F , Toutdoortube -Tcompensation <= (Toutdoorambient - 37 F)
3) During defrost, if run time for the compressor does not reach 3 minutes, the defrost cycle will not start for the next 2
hours. At that time the compressor stops operation and 30 seconds later the outdoor fan will stop. 30 seconds aer this the
4-way reversing valve will de-energized. Following another 30 second delay, the compressor will increase its compressor
speed for defrosting. Defrosting will last for 450 seconds or until the Toutdoortube >= 50 F, at this temperature the compres-
sor will decrease it compressor speed for 30 seconds, then will stop. In another 30 seconds the 4-way valve will energize,
the 60 seconds later the compressor and outdoor fan will start. e compressor speed for defrosting will be 85hz.
During Defrost mode, a “H1” will be displayed on the indoor front panel display indicating the user selected mode has
been overridden and the system is performing a outdoor coil defrost operation.
System Operation 9,000/12,000 btuh Models, cont.
Basic Functions
Product Introduction

20
System Protection
Cold Air Prevention (Heating mode with compressor running)
e system guards against discharging cold air in heating mode. It will delay the indoor fan until the evaporator coil has
warmed up to discharge warm, comfortable air into the room.
1) When the Tindoorambient < 75 F and the Tindoortube <= 104 F with the fan in a stopped state, the indoor fan will begin
to run at low speed aer a 2 minute delay. is will reduce cold air upon heating startup. Within 2 minutes, if
Tindoortube > 104 F, the indoor fan will run at low speed. Aer 1 minute of operation, the fan will run at the preset fan
mode. Within 1 minute of low speed operation or 2 minutes of no fan operation, with the Tindoortube > 108 F, the fan will
run at the preset mode.
2) If the Tindoorambient >= 75 F and the Tindoortube <= 108 F the indoor fan will run at low speed for 1 minute than run
at the preset mode. Aer 1 minute of low speed operation, if the and the Tindoortube > 108 F the fan will operate at its
preset mode.
Note:
e Tindoorambient in 1 & 2 above refers to the unit going into the heating mode coming out of defrost.
Overcurrent and Speed Protection (Total Current = Itotal)
e soware will monitor the compressor current draw and adjust the compressor speed in order to maintain the inverter and
compressor in a safety and reliable operating range.
A. If Itotal <= 6, an increase in frequency will be allowed
B. If Itotal >= 7, increasing the frequency is not allowed.
C. If Itotal >= 8, the compressor will decrease its frequency
D. If Itotal >= 9, the compressor will stop and the indoor fan will stop aer 30 seconds.
4)Fan Mode
Under this mode, the fan will run at the preset speed and the outdoor fan, compressor and 4-way valve will stop.
5)Auto Mode
Auto Mode Process
Setting the auto mode will run the unit in heat or cool automatically depending on Tindoorambient
1)Operating Parameters
A. If the Tindoorambient >= 79 F the unit will operate in cooling mode. e set temperature is 77 F.
B. If the Tindoorambient <= 72 F the unit will operate in heat mode. e set temperature is 68 F.
C. When the Tindoorambient <= 73 F and >= 77 F, the unit will operate in the previous state. If it is energized
for the rst time, it will run in Fan mode
D. In auto mode, the cooling frequency will be the same as the cooling only mode and the heating frequency will
be the same as the heating only mode.
2) Protection
A. In cooling operation, protection is the same as the cooling only mode
B. In heating operation, protection is the same as the heating only mode
C. When the indoor ambient temperature changes, the operation mode will be automatically selected. Once started
the compressor will have a 6 minute runtime.
System Operation 9,000/12,000 btuh Models, cont.
Basic Functions
Product Introduction