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

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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

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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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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

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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

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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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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