Carrier 40VM Series User manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 19-40VM001-06 Printed in U.S.A. Form 40VM-1SM Pg 1 8-19 Replaces: New
Service Manual
40VM Series
Indoor Units and Controllers for
Variable Refrigerant Flow (VRF) Heat Pump System

2
TABLE OF CONTENTS
INDOOR UNITS................................................................................................................................................................................3
General Information.......................................................................................................................................................................3
Refrigerant Circuit.........................................................................................................................................................................5
Operating Temperature Range.......................................................................................................................................................6
Function and Control.....................................................................................................................................................................7
REMOTE CONTROLLERS............................................................................................................................................................23
Wireless Remote Controller.........................................................................................................................................................23
Address Setting............................................................................................................................................................................24
Wired Remote Controller.............................................................................................................................................................25
TROUBLESHOOTING...................................................................................................................................................................38
Error Code List............................................................................................................................................................................38
Wiring Diagrams.........................................................................................................................................................................39
Indoor Electric Control Box Details............................................................................................................................................50
Indoor Main Board Instructions...................................................................................................................................................58
Troubleshooting from Indoor Unit...............................................................................................................................................64
Troubleshooting from Remote Controller....................................................................................................................................75
APPENDIX......................................................................................................................................................................................79

3
INDOOR UNITS
General Information
INDOOR UNIT MODEL NUMBER NOMENCLATURE
Fig. 1 —Model Nomenclature (Indoor Units)
Table 1 —Indoor Unit Capacity
INDOOR UNIT CAPACITY 5 7 9 12 15 18 24 30 36 48 54 72 96
4-Way Cassette 40VMF • • • • • • • •
Compact 4-Way Cassette 40VMC • • • • •
1-Way Cassette 40VMI • • • • • • •
High Wall 40VMW • • • • • • • •
Low Static Duct 40VML • • • • • •
Medium Static Duct 40VMM • • • • • • • • •
High Static Duct 40VMH • • • • • • •
Vertical AHU 40VMV • • • • • • •
Underceiling/Floor 40VMU • • • • • • •
Floor Console Recessed 40VMR • • • • • •
Outside Air 40VMA • • • • •
40 VM F 007 A - - 3
Digit # 1,2: Product Series
40 - Indoor Fan Coil Unit
Digit # 3,4: Model Letters
VM - Carrier VRF
Digit # 12: Electrical
3 - 208/230-1-60
Digit # 5: Model Number Modifier
A - Outside Air
C - Compact 4-Way Cassette Digit # 11: Not Defined
D - Multiport Distribution Controller - Blank
F - 4-Way Cassette
H - High Static Duct Digit # 10: Not Defined
L - Low Static Duct
- Blank
M - Medium Static Duct
Digit # 9: Not Defined
R - Floor Console Recessed
A - Design Revision
U - Underceiling / Floor
V - Vertical AHU
W - High Wall
Digit # 6,7,8: Cooling Capacity (Btu/h)
009 - 9,000 012 - 12,000
015 - 15,000 018 - 18,000
024 - 24,000 030 - 30,000
036 - 36,000 048 - 48,000
I - 1-Way Cassette
005 - 5,000 007 - 7,000
054 - 54,000 072 - 72,000
096 - 96,000

4
INDOOR UNITS LINEUP
Figure 2 - 4-Way Cassette
(40VMF)
Figure 3 - Compact 4-Way
Cassette (40VMC)
Figure 4 - High Static Duct
(40VMH)
Figure 5 - High Wall
(40VMW)
Figure 6 - Low Static Duct
(40VML)
Figure 7 - Medium Static Duct
(40VMM)
Figure 8 - Underceiling / Floor
(40VMU)
Figure 9 - Floor Console
Recessed (40VMR)
Figure 10 - Vertical AHU
(40VMV)
Figure 11 - Outside Air
(40VMA)
Figure 12 - 1-Way Cassette
(40VMI)

5
Refrigerant Circuit
Fig. 13 — Refrigerant Circuit Schematic Diagrams for Indoor Units (40VMA)
Fig. 14 —Refrigerant Circuit Schematic Diagrams for Indoor Units (40VMC, F, H, I, L, M, R, U, V, W)
Table 2 —Refrigerant Circuit Component Function
NO. NAME SYMBOL FUNCTION
1 Room or return air temperature sensor T1 (T0 for 40VMA) Used for thermostat control
2 Inlet pipe temperature sensor T2A Used to calculate subcooling (SC) when heating
3 Outlet pipe temperature sensor T2B Used to calculate superheated (SH) when cooling
4 Electronic expansion valve EEV Used to control SH in cooling and SC in heating
5 Room temperature sensor TA (Only for 40VMA) Used to stabilize outlet air temperature by controlling fan speed or EEV opening
6 Solenoid valve SVD (Only for 40VMA) Used to prevent refrigerant trapping in the heat exchanger
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6
Table 3 —List of Electronic Expansion Valve Types
● 500 Pulses
☐2000 Pulses
Operating Temperature Range
The 40VMA (outside air) functions are cooling, heating, and fan operation.
Other indoor units can operate in cooling, heating, auto, fan, and dry mode.
COOLING MODE —
Indoor unit (except 40VMA) thermal OFF is activated when the return air temperature is below 59°F WB.
HEATING MODE —
Indoor unit (except 40VMA) thermal OFF is activated when return air temperature is above 84°F DB.
Table 4 —40VMC, F, H, I, L, M, R, U, V, W
Table 5 —40VMA
CAPACITY INDEX 5 7 9 12 15 18 24 30 36 48 54 72 96
1-Way Cassette (40VMI) ●●●●●●●
4-Way Cassette (40VMF) ● ● ● ● ● ● ● ●
High Wall (40VMW) ☐☐☐☐☐☐☐☐
Medium Static Duct (40VMM) ☐☐☐☐☐ ●●●●
Low Static Duct (40VML) ☐☐☐☐☐☐
Vertical Air Handing Unit (40VMV) ● ● ● ● ● ● ●
High Static Duct (40VMH) ● ● ● ● ● ● ●
Outside air (40VMA) ● ● ● ● ●
Compact 4-Way Cassette (40VMC) ● ● ● ● ●
Underceiling/Floor (40VMU) ● ● ● ● ● ● ●
Floor Console Recessed (40VMR) ☐☐☐☐☐
Mode Inside Temperature
Cooling 50~75°FWB
Heating 54~86°FDB
Mode Inside Temperature
Cooling and
Fan 41~109°FWB
Heating 23~109°FDB

7
Function and Control
ELECTRONIC EXPANSION VALVE OPERATION — Electronic expansion valves of the indoor unit regulate the refrigerant
flow to control superheat during cooling operation and subcooling during heating operation.
Table 6 —List of 500P EEV Opening in Cooling Mode
Table 7 —List of 2000P EEV Opening in Cooling Mode
500P EEV Operation Driver
When the indoor unit receives the following signal:
• Signal to turn OFF
• Indoor unit error signal
• Indoor unit turns to fan mode
• Indoor unit turns to thermo-OFF
• Indoor unit shut down due to low temperature protection on the evaporator
The EEV’s control uses the following logic:
• If the outdoor unit shuts down without cooling capacity requirement:
The EEVs keep previous opening for three minutes.
Then EEVs conduct 300P opening (EEV whose opening is not equal to zero will close to 0P first, then open to 300P).
• If the cooling capacity requirement of the outdoor unit is not equal to 0, the EEVs keep the previous opening for 25 seconds
after the indoor unit turns off, then close to -16P to reset the opening and standby.
When the indoor unit receives the turn ON signal, the EEVs control uses the following logic:
CAPACITY INDEX INITIAL OPENING MINIMUM OPENING MAXIMUM OPENING
7~18 120 54 480
24 120 54 480
30 120 54 480
36 120 54 480
Larger than 48 120 54 480
CAPACITY INITIAL OPENING MINIMUM OPENING MAXIMUM OPENING
Less than 12 300 104 2000
15~18 200 104 2000
24 300 104 2000
30 400 104 2000
Larger than 36 400 104 2000

8
Fig. 15 —500P EEV Operation Driver
Initial EEV opening
Is Pe 14.5psi?
Keep the EEV
open for five minutes
NO
YES
Pump down order
NO
EEV Superheated
degree control
EEV open to 200P
for 3min
7~12K: EEV open to 350P,
15~30K: EEV open to 300P,
36~54K: EEV open to 250P.
Is DSH27F?
YES
NO
NO
Is Pe44psi?
YES
Is Startup time
30min ?
Pe 17psi,
or Tdsh 45,
or Pc 464psi
Is Pe22psi?
YES
NO
EEV Superheated
degree control until initial
EEV opening three minutes
YES
EEV -16P until close
YES
NO
YES
NO
EEV open to 200P for one
minute, if Pe 14.5psi, the
next time EEV opening
+80P until 480P

9
2000P EEV Operation Driver
When the indoor unit receives the following signal:
• Signal to turn OFF
• Indoor unit error signal
• Indoor unit turns to fan mode
• Indoor unit turns to thermo-OFF
• Indoor unit shut down due to low temperature protection of the evaporator
The EEV’s control uses the following logic:
• If the outdoor unit shuts down without cooling capacity requirement:
The EEVs keep previous opening for three minutes. Then EEVs conduct 1200P opening (EEVs whose opening is not equal to
zero will close to 0P first, and then open to 1200 P).
• If the cooling capacity requirement of the outdoor unit is not equal to 0, the EEVs keep the previous opening for 25 seconds
after the indoor unit turns off, and then close to -40P to reset the opening and open to 224P (Standby).
When the indoor unit receives the turn ON signal, the EEVs controls use the following logic:
Fig. 16 —2000P EEV Operation Driver
Initial EEV opening
Is Pe 14.5psi?
Keep the EEV
open for five minutes
NO
YES
Pump down order
NO
EEV Superheated
degree control
EEV open to
1000P for three minutes
Is DSH 27F?
YES
NO
7~12K: EEV open to 1200P,
15~30K: EEV open to 1000P,
36~54K: EEV open to 800P.
NO
Is Pe 44psi?
YES
Is startup time
30 minutes?
Pe 17psi,
or Tdsh 45,
or Pc 464psi
Pe 36psi?
YES
NO
EEV Superheated
degree control until initial
EEV opening three minutes
YES
YES
NO EEV -40P until close,
then open to 24P
YES
NO
EEV open to 1000P for one
minute, if Pe 14.5psi, the
next time EEV opening
+400P until 2000P

10
SUPERHEAT CONTROL
This function is used to adjust the opening of the electronic expansion valve so that superheat (SH) will reach a targeted superheat
value (SHS).
The superheat is calculated by reading the temperature of the gas pipe thermistor (T2B) and the temperature of the liquid pipe
thermistor (T2A) of the indoor unit.
SH = T2B - T2A SH: Evaporator outlet superheat (°F)
SHS: Target SH value T2B: Indoor unit gas pipe temperature (°F)
T2A: Indoor unit liquid pipe temperature (°F)
DSH: Discharge superheat of outdoor unit
40VMC, F, H, I, L, M, R, U, V, W Series
Initial SHS = 9°F for the first ten minutes after outdoor unit starts. SHS corrections are made according to the following logic:
Table 8 —SHS Correction by DSH of Outdoor Unit
HEATING OPERATION
Startup and Stop Control of 5000P EEV
When the indoor unit receives any of the following signal:
• signal to turn off
• indoor unit error signal
• indoor unit turns to thermo-off
The EEV’s control uses the following logic:
• If the outdoor unit shuts down without heating capacity requirement:
The EEVs keep the previous opening for three minutes.
Then EEVs conduct 300P opening (EEV whose opening is not equal to 0 will close to 0P first, then open to 300P).
• If the heating capacity requirement of the outdoor unit is not equal to 0:
The EEVs keep previous opening for 25 seconds after the indoor unit turns off, and then close to -16P to reset the opening and
open to 72P (Standby).
When the indoor unit receives the signal to turn ON, the EEV’s control uses the following logic:
Fig. 17 —For Heat Pump and Single Phase-VRF
SHS
Correction
Heat Pump VRF, Single-Phase VRF Heat Recovery
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6+6 
6+6 
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 6+6 
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6+6 
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6+6 
6+6 
6+6 
6+6 
All the
indoor units
open to OP
Compressor starts > 200s
Pc > 362 psi
Pc-Pe > 123 psi
T2a > 89.6°F
Heat Pump VRF
Single Phase VRF
Capacity
requirement = 0
Capacity
requirement = 0
Startup Signal
72P standby opening
First open to max. opening
for one minute, and then
open to initial opening for
4 minutes

11
Fig. 18 —For Heat Recovery Outdoor Unit
Table 9 —List of 500P EEV Valve Opening in Heating Mode
Start and Stop Control of 2000P EEV
When the indoor unit receives any of the following signal:
• Signal to turn off
• Indoor unit error signal
• Indoor unit turns to thermo-off
The EEV’s control uses the following logic:
• If the outdoor unit shuts down without heating capacity requirement:
The EEVs keep the previous opening for three minutes. Then all EEVs conduct 1200P opening (EEVs whose opening is not
equal to zero will close to 0P first, and then open to 1200P).
• If the heating capacity requirement of the outdoor unit is not equal to 0:
The EEVs keep the previous opening for 25 seconds after the indoor unit turns off, and then close to -40P to reset the opening
and open to 224P (Standby).
When the indoor unit receives the signal to turn on, the EEV’s control uses the following logic:
Fig. 19 —For Heat Pump Capacity
Fig. 20 —For Heat Recovery Outdoor Unit
CAPACITY
INDEX
INITIAL OPENING MINIMUM OPENING MAXIMUM OPENING
HEAT PUMP AND
SINGLE PHASE VRF HEAT RECOVERY HEAT PUMP AND SINGLE PHASE VRF HEAT RECOVERY HEAT PUMP AND SINGLE PHASE VRF HEAT RECOVERY
7~24 400 330 144 120 480 480
30~54 400 330 200 160 480 480
All the
Startup signal indoor units
open to OP Heat Recovery Unit
Compressor starts 200 s
Pc 362psi
Pc - Pe 123psi
T2a 89.6°F
Reset, then open OP
Capacity
requirement = 0
Capacity
requirement = 0
First open to 120P for one
minute, and then open to
initial opening for 4
minutes
All the
indoor units
open to 24P
Compressor starts > 200s
Pc > 362 psi
Pc-Pe > 123 psi
T2a > 89.6°F
Heat Pump VRF
Single Phase VRF
Capacity
requirement = 0
Capacity
requirement = 0
Startup Signal
224P standby opening
First open to max. opening
for one minute, and then
open to initial opening for
4 minutes
All the
Startup signal indoor units
open to OP Heat Recovery Unit
Compressor starts 200 s
Pc 362psi
Pc - Pe 123psi
T2a 89.6°F
Reset, then open OP
Capacity
requirement = 0
Capacity
requirement = 0
First open to 120P for one
minute, and then open to
initial opening for 4
minutes

12
Table 10 —List of 2000P EEV Valve Opening in Heating Mode
SUBCOOLING CONTROL — This function is used to adjust the opening of the electronic expansion valve (EEV) so that
subcooling (SC) will reach the target subcooling value (SCS).
Subcooling is calculated as the difference between the condensing temperature (Tc) and inlet pipe temperature (T2A) on the
indoor unit.
SC = Tc - T2A SC: Evaporator outlet subcooling (°F)
SCS: Target subcooling value Tc: Condensing temperature (°F)
T2A: Inlet pipe temperature (°F)
40VMC, F, H, I, L, M, R, U, V, W Series
Initial SCS = 9°F in the first ten minutes after the outdoor unit starts up.
The SCS corrections are made according to the following logic:
1. SCS = 9°F in test operation, trial operation, and forced heating operation.
2. Lack of refrigerant signal = OFF, SCS control uses the follow logic:
Fig. 21 —40VMC, F, H, I, L, M, R, U, V, W Series
SCS′ = the preceding SCS in the picture above.
Lack of refrigerant signals = ON, SCS = SCS′ + 3.6
3. If only one or two indoor units in the system are in heating operation, the EEV opening of these indoor units is forced to maximum
and fixed.
CAPACITY INDEX INITIAL OPENING MINIMUM OPENING MAXIMUM OPENING
≥48 1400 700 2000
36 1400 700 2000
24~30 1000 500 2000
15~18 600 500 2000
≤12 600 500 2000
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6&6 
7
6&6 

13
LOUVER CONTROL OPERATION
This control feature allows the user to set the air flow direction by controlling the position of the louver and discrete motor steps
as shown below. The range of air flow direction varies based on the indoor unit style.
Table 11 —Louver Position (40VMC, F, W)
Table 12 —Louver Position (40VMU, 40VMI)
* 40VMU048---3 only
OPERATION OF FAN IN AUTO FAN MODE
When the fan speed mode is set to Auto, the fan will run at constant speed for three minutes before determining the range based
on supply air and evaporator pipe temperature. Fan speed control is based on the following tables:
Table 13 —Fan Speed Operation in the First Three Minutes
T1: Room or return air temperature
T2A: Inlet pipe temperature
Ts: Target room temperature
Tc: Condensing temperature
ta: Air side temperature
tr: Refrigerant side temperature
INDOOR
UNIT
OPERATION
MODE
POSITION SWING FACTORY
SETTING STOP
P0 P1 P2 P3 P4 P0 P4
40VMF Cooling 15 30 40 50 60 15 60 P2 0
Heating 15 30 40 50 60 15 60 P4 0
40VMC Cooling 200 230 260 290 318 200 318 P2 0
Heating 200 230 260 290 318 200 318 P4 0
40VMW Cooling 61 65 75 85 93 61 93 P1 0
Heating 68 80 90 100 110 68 110 P4 0
INDOOR UNIT OPERATION
MODE
POSITION (VERTICAL ANGLE) SWING FACTORY
SETTING
STOP RANGE OF
HORIZONTAL
ANGLE
P0 P1 P2 P3 P4 P0 P4 VERTICAL
ANGLE
HORIZONTAL
ANGLE
40VMU Cooling 50 57 65 72 80 50 80 P3 0 32 [5,64]
Heating 80 87 95 105 110 80 110 P4 0 32 [5,64]
40VMU * Cooling 55 62 70 77 85 55 85 P3 0 60 [10,100]
Heating 80 87 95 105 110 80 110 P4 0 60 [10,100]
40VMI (05, 07, 09, 12) Cooling 25 43 60 70 80 25 80 60 0 / /
Heating 25 43 60 70 80 25 80 60 0 / /
40VMI (15, 18, 24) Cooling 25 43 60 70 80 25 80 60 0 48 [3, 93]
Heating 25 43 60 70 80 25 80 60 0 48 [3, 93]
P0
P1
P2
P3
P4
P5
RANGE COOLING OPERATION ΔTR < 21.6°F 21.6°F ≥ ΔTR < 36°F ΔTR ≥ 36°F
ΔTA = T1 – TS ΔTR = TS - T2A
1 Δta ≥ 4.5°F High High High
2 2.7°F ≥ Δta < 4.5°F High High Medium
3 0.9°F ≥ Δta < 2.7°F High Medium Medium
4 Δta < 0.9°F Medium Medium Medium
RANGE COOLING OPERATION ΔTR < 21.6°F 21.6°F ≥ ΔTR < 36°F ΔTR ≥ 36°F
ΔTA = T1 – TS ΔTR = TC - TS
1 Δta ≥ 4.5°F High High High
2 2.7°F ≥ Δta < 4.5°F Medium Medium Medium
3 0.9°F ≥ Δta < 2.7°F Medium Low Medium
4 Δta < 0.9°F Medium Low Low

14
FAN SPEED CONTROL AFTER THE FIRST THREE MINUTES
Fig. 22 —Cooling Operation
Fig. 23 —Heating Operation
INDOOR UNIT AND OUTDOOR UNIT OPERATION MODE
Operating mode of indoor unit should be the same as outdoor unit. If not, a mode conflict error will be displayed on indoor unit.
40VMC, F, H, I, L, M, R, U, V, W Series
Table 14 —Heat Pump or Single-Phase
*1 Mode conflict on indoor units operating in a different mode than the outdoor unit.
Table 15 —Heat Recovery
*2 Indoor units connected to same port on MDC have the same operating mode.
OUTDOOR UNIT OPERATION
MODE
INDOOR UNIT OPERATION MODE
COOLING OPERATION AUTO/FAN/DRY HEATING OPERATION
OFF - - -
Cooling *1 OK OK Mode conflict
Heating *1 Mode conflict Mode conflict OK
Forced Cooling OK OK N/A
Forced Heating N/A N/A OK
Outdoor Unit Operation Mode Indoor Unit Operation Mode
Cooling Operation Auto/Fan/Dry Heating Operation
OFF - - -
Cooling *2 OK OK OK
Heating *2 OK OK OK
Forced Cooling OK OK N/A
Forced Heating N/A N/A OK
Continue operation time after first stage30 minutes
Current range initial one
Current range
3
Cooling mode
T2A 39.2°F
EEV 1.2 *(minimum opening)
Fan
speed-1
Fan
speed+1
Continue operation time after first stage60 minutes
The range of ¨ta is not in range 4
Continue operation time after first stage30 minutes
The range of ¨ta < the initial one
Cooling mode
T2A < 7.2°F five minutes after the first stage
Cooling mode
Continue operation time after stageof SH < 3.6°F lasts ten minutes
EEV opening = min
Fan speed remains
unchanged for at least
ten minutes
Continue operation time after first stage 30 minutes
Current range initial one
Current range 
Heating mode
TC < 118.4
° F
Cooling mode
Tc 
° F five minutes after the first stage
Continue operation time after first stage PLQXWHV
The range RI¨WDLVQRWLQUDQJH
Continue operation time after first stage PLQXWHV
The range RI¨WDLVQRWLQWKHUDQJHRI
Fan
speed-1
Fan speed remains
unchanged for at least
ten minutes
Fan
speed+1
Continue operation time after first stage 30 minutes
The range RI¨WDWKHLQLWLDORQH

15
40VMA Series
Table 16 —For Heat Pump or Single-Phase
*1 Mode conflict on indoor units operating in different modes than the outdoor unit.
Table 17 —Heat Recovery
*2 Indoor units connected to same port on MDC have the same operating mode.
Even though the outside air unit is in mode conflict, it will operate fan mode if the condition is satisfied (T0 is between 41°F and
109°F), but the mode conflict code (dd) will always be displayed.
Fig. 24 —Cooling
Fig. 25 —Heating
Fig. 26 —Fan
OUTDOOR UNIT OPERATING
MODE
INDOOR UNIT OPERATING MODE
COOLING OPERATION FAN HEATING OPERATION
OFF - - -
Cooling OK OK Mode conflict
Heating Mode conflict OK OK
Forced Cooling OK OK N/A
Forced Heating N/A N/A OK
OUTDOOR UNIT OPERATING
MODE
INDOOR UNIT OPERATING MODE
COOLING OPERATION FAN HEATING OPERATION
OFF - - -
Cooling *2 OK OK OK
Heating *2 OK OK OK
Forced Cooling OK OK N/A
Forced Heating N/A N/A OK

16
DRAIN PUMP OPERATING SEQUENCE
When the indoor unit is in cooling mode, the drain pump operation is on. If the indoor unit stops or changes to another mode, the
drain pump runs for 40 seconds before turning OFF.
The drain pump uses the following sequence of operation:
• The float switch is tripped when the water level rises to a certain level within the drain pan.
Regardless of the indoor unit mode, the drain pump is forced to turn ON immediately.
• The float switch resets when the water level drops below a certain level in the drain pan.
The pump keeps its previous operating condition for another one minute, and then goes to normal operating conditions. Otherwise,
the thermostat turns off and returns an error if the water level does not decrease in three minutes. The preset thermostat mode
operation will not continue until the float switch is reset.
Fig. 27 —Float Switch is Tripped while Cooling Thermo-On
Fig. 28 —Float Switch is Tripped while Cooling Thermo-Off
Thermostat
(Operating)
Float switch
Drain pump
40s
3 min
ON
OFF
ON
OFF
ON
OFF
Error code ರEEರwill be reported if the float
switch is not reset within 3min
Reset
Thermostat
(Operating)
Float switch
Drain pump
1min
3 min
ON
OFF
ON
OFF
Error code ರEEರwill be reported if the float
switch is not reset within 3min
ON
OFF

17
FREEZE PROTECTION
Freeze protection control is only activated in cooling or dry operation mode. When freeze protection is activated, the cooling
demand turns to zero. The fan speed does not change and the electronic expansion valve is fully closed.
• Freeze protection is activated when the inlet pipe temperature (T2A) is < 30.2°F for 40 minutes or < 23°F for 10 minutes.
• Freeze protection is deactivated when the inlet pipe temperature (T2A) is > 44.6°F for 10 minutes or > 39.2°F for 20 minutes.
Fig. 29 —Freeze Protection
Before freeze protection operation, the compressor will stop for a period of time before restarting.
COLD BLOW PROTECTION DURING HEATING OPERATION
Cold Blow Protection is only available in heating operation and prior to other control modes (i.e. Defrost and Oil Recovery).
Fig. 30 —40VMC, F, H, I, L, M, R, U, V, W Series

18
Fig. 31 —40VMA Series
Tc: Condensing temperature for Heat Pump
Saturation temperature of PS1 at main MDC unit for Heat Recovery
Tcps: Cold Blow Protection is activated at temperature: 50°F, 59°F, 68°F, 75.2°F, 82.4°F (Factory setting: 68°F)
The louver position is only valid for indoor units with louver function.
The Cold Blow function temperature can be adjusted using the wired remote controller.
HEATER CONTROL — The heater control is conducted as follows:
• Normal Control
While in heating operation, the heater control (ON/OFF) uses the following logic.
Fig. 32 —Heater Control Logic
NOTE: The requirement is invalid while the remote controller receives fast check instruction.
• Fan Previous Operation
To protect the heater, the fan conducts the previous operation for fifteen seconds after it turns off.
• Close Operation
The heater will never open if it was set to close from the remote controller.

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OPERATION WITH INDOOR CAPACITY OVERLOAD
When the operating combination ratio is > 120%, the outdoor unit transmits an overload operation signal to indoor units. All indoor
units* conduct the following operations until the running combination ratio < 105%:
• Enforced low speed for all operating indoor units except for the ones in fan mode.
• The maximum opening of the electronic expansion valves decreases to 1200P for 2000P (350P for the 500P).
It will never go to overload operation when the Heat Recovery system is in simultaneous heating and cooling mode.
* If the fourth code of SW1 is set to ON and the address is set to 63#, the Mode Priority indoor unit is excluded. Only one Mode
Priority indoor unit is allowed to exist in a refrigerant system.
Refer to the dip switch settings in Appendix A of the Indoor Unit Installation Manual.
LOCKING FUNCTION
Part of the indoor unit functions can be locked from the host computer, but the locking instruction affects the remote controller
because the indoor unit will keep its current status.
• Startup locking
If the startup function is locked, the indoor unit can only answer to the startup signal, and it ignores the shutdown signal from
the remote controller.
• Shutdown locking
If the shutdown function is locked, the indoor unit can only answer to the shutdown signal, and it ignores the startup signal
from remote controller.
• The lowest cooling temperature locking
The host computer locks the lowest setting temperature for space in cooling mode. Therefore, the cooling thermostat only
answers to the setting temperature, which is equal to or higher than the locked value. The locked value will be received instead
of the setting temperature, which is lower than it for the indoor unit.
• The highest heating temperature locking
The host computer locks the highest setting temperature for space in heating mode. Therefore, the heating thermostat only
answers to setting temperatures that are < the locked value. The locked value will be received instead of the setting
temperature, which is higher than the one for the indoor unit.
• Fan speed locking
Locks the fan speed setting.
EEV AND FAN
Table 18 —Oil Recovery*
* For Heat Recovery systems, oil recovery in heating operation is the same as the defrost operation.
Operating Combination Ratio = Total capacity index of the operating indoor units
Capacity index of the outdoor unit
OIL RECOVERY
MODE
BEFORE OIL RECOVERY OIL RECOVERY OPERATING
2000P EEV 500P EEV FAN
OPERATING MODE ENERGY DEMAND OPENING OPENING
Cooling Operation
OFF -- 0 1200P 300P OFF
Error -- 0 1200P 300P OFF
Fan -- 0 1200P 300P Keep unchanged
Cooling thermo-ON Cooling Not 0 SH control SH control Keep unchanged
Cooling thermo-OFF Cooling 0 1200P 300P Keep unchanged
Heating Operation *
Heating thermo-ON Heating Not 0 1504P 480P OFF
Heating thermo-OFF -- 0 1504P 480P OFF
Error -- 0 1504P 480P OFF
OFF -- 0 1504P 480P OFF

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Table 19 —Defrosting Operation (For Heat Recovery Only)
Table 20 —Defrosting Operation (For Heat Pump and Single Phase VRF Only)
When receiving the signal for defrosting completion, the opening of the heating thermo-ON indoor unit is 240P for 500P-
Opening EEV and 960P for 2000P-EEV. It will remain like this for three minutes, and then go to normal control.
The thermo-OFF or fan mode indoor unit will recover standby or fan mode control after defrost completion.
Fig. 33 —Defrosting Operation
Fan Speed Setting in Cooling Thermo-OFF
This can be set from the wired remote controller. The default setting is holding on the current speed.
Fan Speed Setting in Heating Thermo-OFF
It is invalid for Heat Pump and Mini-VRF systems to set fan speed in heating thermo-OFF, but for Heat Recovery systems, it can
be set from the wired remote controller. The default setting is OFF.
BEFORE DEFROSTING DEFROST OPERATING
2000P EEV 500P EEV FAN
OPERATING MODE ENERGY DEMAND < 1 MIN [1,3] MIN ≥ 3 MIN < 1 MIN [1,3] MIN ≥ 3 MIN
Cooling Thermo-ON Cooling Not 0 800P 800P 1504P 120P 120P 300P Keep unchanged
Cooling Thermo-OFF Cooling 0 800P 800P 1504P 120P 120P 300P Keep unchanged
Heating Thermo-ON Heating Not 0 504P 800P 1504P 72P 120P 300P OFF
Heating Thermo-OFF Heating 0 504P 800P 1504P 72P 120P 300P OFF
OFF None 0 800P 800P 800P 120P 120P 120P OFF
Error -- 0 800P 800P 800P 120P 120P 120P OFF
Fan None 0 800P 800P 800P 120P 120P 120P Keep unchanged
BEFORE DEFROSTING DEFROSTING OPERATING
2000P EEV 500P EEV FAN
OPERATING MODE ENERGY DEMAND OPENING OPENING
Heating Thermo-ON Heating Not 0 1504P 480P OFF
Heating Thermo-OFF Heating 0 1504P 480P OFF
OFF None 0 1504P 480P OFF
Error -- 1504P 480P OFF
Tsh=55°F (Default) or
Tsc=85°F
62°F (ǻt=0 & ǻF=2°F)