GREE FLEXX Cold Climate Heat Pump User Guide
- September 24, 2024
- Gree
Table of Contents
FLEXX Cold Climate Heat Pump
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Specifications
- Product: Cold Climate Heat Pump
- Model: FLEXX36HP230V1AO, FLEXX60HP230V1AO
- Capacity: 36kBtu, 24kBtu, 60kBtu, 48kBtu
- Operating Modes: Standard, Strong Defrost, Energy Saving
Product Usage Instructions
Outdoor Unit Dip Switch Settings
Make sure the dip switches on the outdoor unit are set correctly
according to the desired configuration. Refer to the manual for
specific settings based on capacity and operating modes.
Refrigerant Charging
When charging the refrigerant for the FLEXX Heat Pump
Systems:
-
For FLEXX36HP230V1AO:
- Add the specified amount based on the total length of the line
set.
- Add the specified amount based on the total length of the line
-
For FLEXX60HP230V1AO:
- Add the specified amount based on the total length of the line
set.
- Add the specified amount based on the total length of the line
FAQ
Q: Can Strong Mode and Energy Saving Mode be enabled
simultaneously?
A: No, Strong Mode and Energy Saving Mode cannot be enabled at
the same time. Only one mode can be enabled at a time.
Q: Where can I find the electric version of the manual?
A: You can download an electric version of the manual from
www.greecomfort.com/flexx-quick-start-guide.
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QUICK START GUIDE
Cold Climate Heat Pump
Thank you for choosing our product. Please read this Quick Start Guide
carefully before operation and retain it for future reference. To download an
electric version of this manual visit www.greecomfort.com/flexx-quick-start-
guide
CAT NO:GREE_FLEXX_QUICK_START_08302024
PLEASE READ FIRST
Although very similar to traditional unitary heat pump systems, the FLEXX Heat
Pump Systems have a few key installation differences.
1. Each outdoor unit has two capacity and blower settings available on their
corresponding control boards. (Detailed on the next page) · The 36kBtu models
are rated for either 24kBtu or 36kBtu, nominal. · The 60kBtu models are rated
for either 48kBtu or 60kBtu, nominal. · The efficiency ratings may change with
a change in the capacity rating. · The outdoor and indoor capacities must
match.
2. Both outdoor and indoor units feature service (shut-off) valves on both
the liquid and gas (suction) valves. · The indoor unit does not contain a
nitrogen charge, but a small amount (0.55lbs) of R-410A refrigerant. · Do not
release this refrigerant to the atmosphere. · When evacuating (pulling a
vacuum), pull from both the liquid and gas (suction) valves. This will ensure
a proper evacuation has been performed and no air or other contaminants are in
the refrigeration system. This will also mean proper evacuation takes less
time.
3. The “W1” terminal activates the electric heat kit (if equipped). · The
W1/DH terminal must be connected at the indoor and outdoor unit, and at the
thermostat. · The heat kit is activated during defrost by the outdoor unit’s
“D” terminal. (Some models may have “W1” instead of “D.” · For a heat pump
application, not straight cooling or dual fuel, the “W1” control wire will
connect to “W2” or “AUX” on the thermostat
4. This system contains PVE oil, not POE. Cross-contamination is prohibited.
· Replace or flush existing line sets and/or coils in a retrofit application
DO NOT DISCARD. STORE THIS INFORMATION IN A SAFE PLACE FOR FUTURE REFERENCE.
OUTDOOR UNIT DIP SWITCH SETTINGS
NOTE · FLEXX outdoor units are configurable by a set of dip switches located
in the upper right hand corner of
the Main Control Board. · By default, the capacity is set at the larger
capacity. Defrost, Power Mode, and Energy Savings are all set
for the Standard, by default. · Power must be shut off prior to changing the
dip switch settings. · The outdoor unit capacity must match the indoor unit
capacity. The Power Mode and Energy Saving
modes cannot be set simultaneously.
SA2
ON
ON
ON
1
2
Capacity
36kBtu Configuration
(Default)
FLEXX36HP230V1AO
24kBtu Configuration
DIP
OFF
OFF
3
4
NOTE The ON position of the switch is towards the word “ON” located on the dip switch bank for the FLEXX outdoor unit.
DIP#1 ON
OFF
Capacity
FLEXX60HP230V1AO
60kBtu Configuration
(Default)
48kBtu Configuration
DIP#1 ON
OFF
Defrost
FLEXX36HP230V1AO FLEXX60HP230V1AO
Standard (Default)
Strong Defrost
DIP#2 ON
OFF
Operating Modes
DIP#3
Standard (Default)
OFF FLEXX36HP230V1AO
FLEXX60HP230V1AO
Energy Saving
OFF
DIP#4 OFF ON
ON Strong Mode
OFF
GREE FLEXX QUICK START GUIDE | 3
OUTDOOR UNIT DIP SWITCH SETTING DESCRIPTION (Continued)
DEFROST
· Standard Defrost Mode is the default setting from the factory. · Strong
Defrost Mode is used in cold but high humidity environments such as areas near
large bodies of water.
Select Strong Defrost Mode if it is common practice to extend defrost timing
or increase the frequency of defrost cycles in the area where the system is
installed. · In other cases where Standard Defrost Mode has been deemed
insufficient, ensure the system is in good working order, the outdoor coil is
clean, and the system is charged properly before changing the defrost setting
to Strong Defrost Mode.
STRONG MODE
· In Strong Defrost Mode, the compressor will increase its speed at a higher
rate than in Standard Defrost Mode, to reduce the ramp up time.
· Strong Defrost Mode may be enabled if Standard Defrost Mode is deemed
insufficient by the customer but note it is less efficient.
· Always ensure the system is in good working order before enabling Strong
Defrost Mode.
ENERGY SAVING MODE
· In Energy Saving Mode, the compressor will increase its speed at a lower
slower rate. This can increase efficiency of the unit and provide additional
dehumidification than the Standard or Strong modes.
· Example: Energy Saving Mode may be used when the new system is replacing a
system that was a half-ton smaller than the FLEXX being installed. (The FLEXX
is not available in 1.5, 2.5 or 3.5 ton capacities, therefore FLEXX would be
set for the next highest capacity such as 2, 3 or 4 ton.)
· The indoor CFM rating should also be reduced to match a normal CFM rating
for the half-ton system design. This would mean that the set point would most
likely be satisfied before reaching the system’s full rated nominal capacity,
reducing energy usage and improving dehumidification in cooling mode.
NOTE Strong Mode and Energy Saving Mode cannot be enabled at the same time.
Only one mode can be enabled.
GREE FLEXX QUICK START GUIDE | 4
REFRIGERANT CHARGING
· It is recommended to install a new 3/8″ X 3/4″ line set. · Filter driers are
not recommended. Follow industry best practices for refrigerant piping.
FLEXX 2/3 Ton – FLEXX36HP230V1AO
Model
Add:
Total Length of Line Set:
Add:
Less than 31 Feet None
96 to 98 Feet 1 lb 7 Oz.
32 Feet
2 Oz.
99 to 101 Feet 1 lb 8 Oz.
33 to 35 Feet 3 Oz. 102 to 104 Feet 1 lb 9 Oz.
36 to 39 Feet 4 Oz. 105 to 107 Feet 1 lb 10 Oz.
40 to 42 Feet 5 Oz.
108 to 110 Feet 1 lb 11 Oz.
43 to 45 Feet 6 Oz.
111 to 114 Feet 1 lb 12 Oz.
46 to 48 Feet 7 Oz.
115 to 117 Feet 1 lb 13 Oz.
49 to 51 Feet
8 Oz.
118 to 120 Feet 1 lb 14 Oz.
52 to 54 Feet 9 Oz.
121 to 123 Feet 1 lb 15 Oz.
55 to 57 Feet 10 Oz. 124 to 126 Feet 2 lb
58 to 60 Feet 11 Oz. 127 to 129 Feet 2 lb 1 Oz.
61 to 64 Feet 12 Oz. 130 to 132 Feet 2 lb 2 Oz.
65 to 67 Feet 13 Oz. 133 to 135 Feet 2 lb 3 Oz.
68 to 70 Feet 14 Oz. 136 to 139 Feet 2 lb 4 Oz.
71 to 73 Feet 15 Oz. 140 to 142 Feet 2 lb 5 Oz.
74 to 76 Feet
1 lb
143 to 145 Feet 2 lb 6 Oz.
77 to 79 Feet 1 lb 1 Oz. 146 to 148 Feet 2 lb 7 Oz.
80 to 82 Feet 1 lb 2 Oz. 149 to 151 Feet 2 lb 8 Oz.
83 to 85 Feet 1 lb 3 Oz. 152 to 154 Feet 2 lb 9 Oz.
86 to 89 Feet 1 lb 4 Oz. 155 to 157 Feet 2 lb 10 Oz.
90 to 92 Feet 1 lb 5 Oz. 158 to 160 Feet 2 lb 11 Oz.
93 to 95 Feet 1 lb 6 Oz. 161 to 164 Feet 2 lb 12 Oz.
164 Feet is Max. Length
FLEXX 4/5 Ton – FLEXX60HP230V1AO
Model
Add:
Total Length of Line Set:
Add:
Less than 31Feet None 65 to 67 Feet 13 Oz.
32 Feet
2 Oz. 68 to 70 Feet 14 Oz.
33 to 35 Feet 3 Oz.
71 to 73 Feet 15 Oz.
36 to 39 Feet
4 Oz.
74 to 76 Feet
1 lb
40 to 42 Feet 5 Oz. 77 to 79 Feet 1 lb 1 Oz.
43 to 45 Feet 6 Oz. 80 to 82 Feet 1 lb 2 Oz.
46 to 48 Feet 7 Oz. 83 to 85 Feet 1 lb 3 Oz.
49 to 51 Feet 8 Oz. 86 to 89 Feet 1 lb 4 Oz.
52 to 54 Feet 9 Oz. 90 to 92 Feet 1 lb 5 Oz.
55 to 57 Feet 10 Oz. 93 to 95 Feet 1 lb 6 Oz.
58 to 60 Feet 11 Oz. 96 to 98 Feet 1 lb 7 Oz.
61 to 64 Feet 12 Oz.
98 Feet is Max. Length
GREE FLEXX QUICK START GUIDE | 5
COLD WEATHER STARTUP
The FLEXX outdoor unit is factory equipped with a crankcase heater. · In
outdoor temperatures below 32°F (0°C), ensure that power is applied to the
outdoor unit for a minimum of 8
hours prior to startup. · Upon power application, check the operation of the
crankcase heater by removing the front access panel,
opening the compressor blanket, and checking to see if the crankcase heater is
hot. · The crankcase heater ensures that liquid refrigerant is not present in
the compressor before startup. · Liquid refrigerant is not compressible and
will force the compressor oil out of the compressor. This will damage
the compressor.
INSTALLATION TIP To make the best use of the 8 hour preheat, do the following:
- Set the outdoor and indoor units 2. Install the refrigerant piping 3.
Perform a leak check 4. Pull a 500 micron vacuum 5. Connect line voltage to
the outdoor unit 6. Weigh in additional charge, if needed 7. Open the indoor
and outdoor shutoff valves 8. Power on the outdoor unit 9. Complete all other
installation items once power is applied to the outdoor unit
GREE FLEXX QUICK START GUIDE | 6
ELECTRIC HEAT KIT PRECAUTIONS
ANY FIELD WIRING, IF PRESENT, ON L1/L2 MUST BE DISCONNECTED PERMANENTLY PRIOR
TO HEAT KIT INSTALLATION! ALL POWER FOR THE AIR HANDLER WILL BE PROVIDED
THROUGH THE HEAT KIT BREAKER! FAILURE TO DISCONNECT ALL FIELD WIRING ON THE
L1/L2 TERMINAL CAN RESULT IN FIRE!
AIR HANDLER DIP SWITCH SETTINGS
NOTE · The FLEXX Air Handlers are configurable by a set of dip switches
located on the main control board. For
proper operation, ensure that the air handler blower settings match the
outdoor unit capacity and ducting design. Power must be off prior to changing
the dip switch settings. · There are 8 static pressure settings for the
blower. · Air handler’s control box Dip Switches are located on the Main
Control Board inside the air handler control box. · By default, the blower is
set at Speed 4. · Dip switch settings are on the following two pages. · As
with all air handling equipment, a duct system with a design that exceeds the
capabilities of the installed equipment will result in customer discomfort,
limited performance, and reduced equipment life.
GREE FLEXX QUICK START GUIDE | 7
AIR HANDLER DIP SWITCH SETTINGS (Continued)
NOTE · Only the “HEAT (SA2)” dip switches are adjusted.
· The “COOL (SA1)” dip switches must remain in the “ON” position.
Model Speed 1 Speed 2 Speed 3 Speed 4 Speed 5 Speed 6 Speed 7 Speed 8
FLEXX24HP230V1BH
HEAT (SA2) COOL (SA1)
ON
DIP
ON
DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
1 234
1 234
Model Speed 1 Speed 2 Speed 3 Speed 4 Speed 5 Speed 6 Speed 7 Speed 8
FLEXX36HP230V1BH
HEAT (SA2) COOL (SA1)
ON
DIP
ON
DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
1 234
1 234
GREE FLEXX QUICK START GUIDE | 8
AIR HANDLER DIP SWITCH SETTINGS (Continued)
Model Speed 1 Speed 2 Speed 3 Speed 4 Speed 5 Speed 6 Speed 7 Speed 8
FLEXX48HP230V1BH
HEAT (SA2) COOL (SA1)
ON
DIP
ON
DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
1 234
1 234
Model Speed 1 Speed 2 Speed 3 Speed 4 Speed 5 Speed 6 Speed 7 Speed 8
FLEXX60HP230V1BH
HEAT (SA2) COOL (SA1)
ON
DIP
ON
DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
12 ON
34 DIP
1 234
1 234
GREE FLEXX QUICK START GUIDE | 9
CHECKING STATIC PRESSURE
To properly utilize the below fan charts it is required to determine Total
Static. · Supply static must be measured in the supply trunk after the air
handler and before branch ducts or registers in
the airflow stream as shown in the figure above · Return static must be
measured in the return trunk towards the air handler after any branch returns,
return
grilles or filters · Keep in mind static pressure drop will increase with a
wet coil (cooling mode) vs dry coil (fan on or heating mode)
NOTE · Total static includes everything the air handler is working against,
supply duct return duct, branch duct,
register boots, elbows, filter grille, filter and so on. · Total Static is the
difference between supply positive pressure and return negative pressure.
Supply Plenum
AIR HANDLER Blower
A Coil
Return Plenum
Supply Duct
POSITIVE PRESSURE NEGATIVE PRESSURE
Return Duct
Filter
DIGITAL MANOMETER
GREE FLEXX QUICK START GUIDE | 10
AIR HANDLER AIRFLOW RATINGS
The following CFM ratings are with a dry coil and included filter. For wet
coil ratings, use 0.92 as the correction factor for the CFM.
Model
FLEXX24HP230V1BH
Static Pressure (In W.c.) and CFM
Level
0
0.1 0.15 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Speed 1 1030 900 840
–
–
–
–
–
–
–
–
–
Speed 2 1080 960 900 840
–
–
–
–
–
–
–
–
Speed 3 1220 1120 1060 990 850
–
–
–
–
–
–
–
Speed 4 1390 1290 1240 1180 1070 960
–
–
–
–
–
–
Speed 5 1580 1490 1440 1390 1290 1180 1090 970 830
–
–
–
Speed 6 1720 1640 1600 1550 1450 1360 1250 1130 960
–
–
–
Speed 7 1800 1730 1680 1630 1550 1460 1370 1270 1150 970 830
–
Speed 8 1850 1820 1790 1740 1660 1580 1500 1410 1340 1200 1080 930
Model
Level
Speed 1 Speed 2 Speed 3 Speed 4 Speed 5 Speed 6 Speed 7 Speed 8
0 1150 1200 1380 1550 1710 1840 1870 1900
0.1 1050 1100 1260 1460 1650 1800 1830 1860
0.15 950 1000 1200 1390 1600 1750 1810 1840
FLEXX36HP230V1BH
Static Pressure (In W.c.) and CFM
0.2 0.3 0.4 0.5 0.6 0.7
880
–
–
–
–
–
940 850
–
–
–
–
1100 950
–
–
–
–
1310 1160 1010 830
–
–
1560 1480 1400 1310 1210 1080
1710 1640 1590 1500 1420 1330
1800 1760 1690 1620 1520 1440
1830 1790 1720 1660 1600 1540
0.8 –
930 1220 1350 1440
0.9 1100 1250 1320
1.0 960 1150 1220
GREE FLEXX QUICK START GUIDE | 11
AIR HANDLER AIRFLOW RATINGS (Continued)
Model
Level
Speed 1 Speed 2 Speed 3 Speed 4 Speed 5 Speed 6 Speed 7 Speed 8
0 1640 1680 1810 1930 2200 2240 2280 2300
0.1 1500 1560 1690 1830 2110 2190 2240 2260
0.15 1450 1500 1620 1770 2040 2145 2200 2220
FLEXX48HP230V1BH
Static Pressure (In W.c.) and CFM
0.2 0.3 0.4 0.5 0.6 0.7
1350 –
–
–
–
–
1380 1300 –
–
–
–
1550 1380 –
–
–
–
1710 1580 1430 1280 –
–
1980 1860 1720 1620 1490 1380
2100 2010 1870 1750 1615 1500
2180 2130 2080 2000 1880 1750
2190 2140 2090 2040 1980 1930
0.8 –
1380 1600 1800
0.9 1420 1700
1.0 1550
Model
Level
Speed 1 Speed 2 Speed 3 Speed 4 Speed 5 Speed 6 Speed 7 Speed 8
0 1660 1850 1920 2110 2250 2260 2300 2320
0.1 1540 1720 1800 2000 2200 2220 2260 2280
0.15 1470 1650 1730 1950 2190 2200 2230 2250
FLEXX60HP230V1BH
Static Pressure (In W.c.) and CFM
0.2 0.3 0.4 0.5 0.6 0.7
1400 –
–
–
–
–
1600 1400 –
–
–
–
1650 1480 1315 –
–
–
1860 1760 1640 1490 1325 –
2140 2040 1930 1800 1670 1520
2170 2090 2010 1910 1760 1650
2200 2150 2115 2050 1990 1920
2230 2190 2140 2080 2040 2000
0.8 –
1370 1550 1840 1950
0.9 1430 1750 1920
1.0 1380 1660 1890
GREE FLEXX QUICK START GUIDE | 12
FIELD INSTALLED TRANSITION
It is recommended to add a Field-installed Transition when the coil does not
have same dimensions as the furnace. Please see the illustration below.
NOTE Adding a proper Field-installed Transition will ensure proper airflow
across the entire coil and allow space for inspecting the coil and heat
exchanger.
GREE FLEXX QUICK START GUIDE | 13
24V CONTROL WIRING SCHEMATIC
Thermostat wiring without heat kit-B Revision Blower shutdown during defrost
NOTE Blower shuts down during defrost to prevent cold air in the space.
Thermostat wiring with heat kit-B Revision Blower shutdown during defrost
NOTE Blower shuts down and heat kit does not activate. GREE FLEXX QUICK START
GUIDE | 14
24V CONTROL WIRING SCHEMATIC (Continued)
Thermostat wiring with heat kit-B Revision Activate heat kit during defrost
NOTE Heat kit and blower runs during defrost.
Thermostat wiring for Dual Fuel
NOTE Dual Fuel Capable Thermostat is required so that the Furnace and the Heat
Pump cannot run at the same time other than when the Heat Pump is in defrost.
GREE FLEXX QUICK START GUIDE | 15
U.S. CONTACT INFORMATION TRADEWINDS, LLC E-mail: info@twciimate.com Contractor Support: 888-850-7928 I Mon-Fri 8 AM – 5 PM EST GREECOMFORT.COM
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