Carrier 38VMA Series User manual

38VMH072-432
Outdoor Unit for
Variable Refrigerant Flow (VRF) Heat Pump System
Service Manual
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 17-38VMH001-06 Printed in U.S.A. Form 38VMH-1SM Pg 1 10-17 Replaces: NEW

Table of Contents
I. General Information ........................................................................................................................................................... 4
1. Model Number Nomenclature .................................................................................................................................. 4
2. Capacity Range .......................................................................................................................................................... 5
3. Outdoor Units Lineup ................................................................................................................................................ 6
4. Indoor Units Lineup ................................................................................................................................................... 6
5. Combination Table..................................................................................................................................................... 7
6. Refrigerant Charge Calculation .................................................................................................................................. 7
II. Refrigerant Circuit............................................................................................................................................................... 8
1. Refrigerant Circuit Diagram ....................................................................................................................................... 8
2. Functional Parts Layout ........................................................................................................................................... 11
3. Refrigerant Flow for Each Operational Mode.......................................................................................................... 13
a. 38VMA072, 096, 120HDS ................................................................................................................................ 13
b. 38VMA144HDS ................................................................................................................................................ 17
III. Function and Control ........................................................................................................................................................ 21
1. Operation Mode ...................................................................................................................................................... 21
2. Basic Control............................................................................................................................................................ 22
a. Normal Operation............................................................................................................................................ 22
b. Capacity Calculation ........................................................................................................................................ 22
c. Compressor Control......................................................................................................................................... 26
Compressor Operating Priority................................................................................................................................ 26
3. Electronic Expansion Valve Control ......................................................................................................................... 28
a. Cooling Electronic Expansion Valve Control .................................................................................................... 28
b. Heating Electronic Expansion Valve Control .................................................................................................... 28
4. Fan Control .............................................................................................................................................................. 29
a. Cooling Fan Control ......................................................................................................................................... 30
b. Fan Control Process ......................................................................................................................................... 30
c. Heating Fan Control ......................................................................................................................................... 30
IV. Special Control.................................................................................................................................................................. 31
1. Startup Control ........................................................................................................................................................ 31
2. Oil Return Operation ............................................................................................................................................... 31
3. Overload Control ..................................................................................................................................................... 33
4. Stopping Operation ................................................................................................................................................. 33
V. Protection Control ............................................................................................................................................................ 35
1. High Pressure Protection Control ............................................................................................................................ 35
2. Low Pressure Protection Control ............................................................................................................................. 35
3. Discharge Pipe Protection Control........................................................................................................................... 35
4. Inverter Protection Control...................................................................................................................................... 36
a. Inverter Overcurrent Protection Control ......................................................................................................... 36
b. Inverter Fin Temperature Control .................................................................................................................... 36
5. Other Control........................................................................................................................................................... 37
a. Outdoor Unit Rotation..................................................................................................................................... 37
b. Sequence of Outdoor Unit Rotation ................................................................................................................ 37
c. Timing of Outdoor Unit Rotation..................................................................................................................... 37
6. Cooling Operation Prohibition................................................................................................................................. 37
7. Heating Operation Prohibition ................................................................................................................................ 37
VI. Field Settings..................................................................................................................................................................... 38
2

1. Instruction on Advanced Operation Mode.............................................................................................................. 39
2. How to Set Advanced Mode Codes ......................................................................................................................... 39
a. Instruction for Advanced Mode....................................................................................................................... 40
b. Refrigerant Recycling Operation ...................................................................................................................... 41
c. Snow-Blowing Function ................................................................................................................................... 41
VII. Troubleshooting................................................................................................................................................................ 42
a. 0E0: Communication Fault Between ODUs ..................................................................................................... 43
b. 0E2: Communication Error Between ODU and IDU......................................................................................... 44
c. 0E4: T3 or T4 Temperature Sensor Error ......................................................................................................... 45
d. 0E5: Voltage Protection ................................................................................................................................... 46
e. 0E8: Incorrect ODU Address ............................................................................................................................ 47
f. 20HO 10H0: Communication Error Between Main Control Board Chip and Compressor Drive Chip ............. 47
g. 0H1: Communication Error Between Main Control Chip and Communication Chip....................................... 48
h. 0H2~0H3: Incorrect Number of ODUs ............................................................................................................. 48
i. 0H7: Incorrect Number of IDUs ....................................................................................................................... 49
j. 0H8: High Pressure Sensor Error...................................................................................................................... 50
k. 0Hb: Low Pressure Sensor Error ...................................................................................................................... 51
l. 10F1 20F1: PTC Error ....................................................................................................................................... 52
m. 0F3~0F5: Temperature Sensor Error................................................................................................................ 53
n. 0F6: Electronic Expansion Valve Error ............................................................................................................. 54
o. 10Hd 20Hd: Follower Unit Error ...................................................................................................................... 54
p. 0P1: Current Leakage Error.............................................................................................................................. 55
q. 0P1: Discharge Temperature Switch or High Pressure Protection................................................................... 56
r. 0P2 0H5: Low Pressure Protection .................................................................................................................. 57
s. 0P3: Over Current Protection for Compressor ................................................................................................ 58
t. 0P4 0H6: Discharge Temperature Protection .................................................................................................. 59
u. 0P5: High Temperature Protection for Pipe Temperature ............................................................................... 60
v. 0H9 0P9: DC Fan Protection............................................................................................................................. 61
w. Suitable for the Model 38VMA***HDS5-1 ...................................................................................................... 62
x. Suitable for the Model 38VMA***HDS6-1 ...................................................................................................... 64
y. 0C7 0PL: High Module Temperature Protection .............................................................................................. 66
z. L0~L9 10H4 / 20H4: Compressor INV Module Protection ............................................................................... 68
Error Display: ........................................................................................................................................................... 68
Applicable Models: .................................................................................................................................................. 68
Error Definition:....................................................................................................................................................... 69
Possible Causes:....................................................................................................................................................... 69
AtL: Ambient Temperature Limit Operation ............................................................................................................ 76
VIII. Appendix........................................................................................................................................................................... 77
1. Wiring Diagram........................................................................................................................................................ 77
2. Electronic Control Box Layout.................................................................................................................................. 81
3. High Pressure Sensor Voltage Characteristics**...................................................................................................... 91
IX. Bill of Material (BOM)....................................................................................................................................................... 92
1. 38VMA072HDS5-1, 38VMA096HDS5-1, 38VMA120HDS5-1 ................................................................................... 92
2. 38VMA144HDS5-1................................................................................................................................................... 97
3. 38VMA072HDS6-1, 38VMA096HDS6-1, 38VMA120HDS6-1 ................................................................................. 103
4. 38VMA144HDS6-1................................................................................................................................................. 108
3

I. General Information
1. Model Number Nomenclature
Figure 1 – Model Nomenclature (Outdoor Unit)
Figure 2 – Model Nomenclature (Indoor Units)
4

Table 1 – Indoor Unit Capacity Chart
Connectable Indoor Unit Capacity
Index *
7 9 12 15 18 24 30 36 48 54 72 96
Outside air 40VMA
•
•
•
•
•
4-way cassette 40VMF
•
•
•
•
•
•
•
•
Compact 4-way cassette 40VMC
•
•
•
•
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
•
•
•
•
•
•
* For example: The capacity index of 40VMF009---3 and 40VMV024 is 9 and 24 respectively.
2. Capacity Range
Connected capacity ratio =
Total capacity index of the indoor units
Capacity index of the outdoor units
Keep a proper connected capacity ratio for the entire system.
Table 2 - Connected Capacity Ratio
Min. combination ratio Max. combination ratio
40VMH for all IDUs *1 ,
40VMV for all IDUs 40VMA connected with other IDUs At least one 40VMH *1 or 40VMV connected Other indoor unit models
50% 100% 100% *2 130% *3 135%
NOTES
*1 When 40VMH048, 054, 072, 096---3 is installed.
*2 When outside air units (40VMA) and standard indoor units are connected, the total capacity index of the 40VMA must be
limited to 30% or less of the capacity index of the outdoor unit.
*3 When the total capacity of 40VMH048, 054, 072, 096---3 or 40VMV exceeds 30%, the combination must not exceeds 100%.
5

3. Outdoor Units Lineup
Outdoor unit capacity range is from 6 to 36 Ton. Maximum number of connectable indoor unit is 64 with connected capacity ratio
up to 135%.
Figure 3 – 6-12 Ton (Single Module) Figure 4 – 14-24 Ton (Dual Module)
Figure 5 – 26-36 Ton (Triple Module)
4. Indoor Units Lineup
Figure 6 - 4-Way Cassette (40VMF)
Figure 7 - Compact 4-Way Cassette (40VMC)
Figure 8 - High Static Duct (40VMH)
Figure 9 - High Wall (40VMW)
Figure 10 - Low Static Duct (40VML)
Figure 11 - Medium Static Duct( 40VMM)
Figure 12 - Underceiling / Floor (40VMU)
Figure 13 - Floor Console Recessed (40VMR)
Figure 14 - Vertical AHU (40VMV)
Figure 15 - Outside Air (40VMA)
6

5. Combination Table
6. Refrigerant Charge Calculation
Based on the field installed refrigerant pipe and system layout, additional refrigerant charge may be required. Add additional
refrigerant based on the calculation below.
Figure 16 - Calculating Refrigerant Charge
R* Amount of additional refrigerant to be charged.
Capacity (Ton) Standard combination Maximum Quantity of Connectable
Indoor Units
Model (208/230V-3Ph-60Hz) Model (460V-3Ph-60Hz) Combination type
6 38VMA072HDS5-1 38VMA072HDS6-1 6 13
8 38VMA096HDS5-1 38VMA096HDS6-1 8 16
10 38VMA120HDS5-1 38VMA120HDS6-1 10 20
12 38VMA144HDS5-1 38VMA144HDS6-1 12 26
14 38VMA168HDS5-1 38VMA168HDS6-1 6 + 8 29
16 38VMA192HDS5-1 38VMA192HDS6-1 8 + 8 33
18 38VMA216HDS5-1 38VMA216HDS6-1 8 + 10 36
20 38VMA240HDS5-1 38VMA240HDS6-1 10 + 10 39
22 38VMA264HDS5-1 38VMA264HDS6-1 12 + 10 46
24 38VMA288HDS5-1 38VMA288HDS6-1 12 + 12 50
26 38VMA312HDS5-1 38VMA312HDS6-1 10 + 8 + 8 53
28 38VMA336HDS5-1 38VMA336HDS6-1 10 + 10 + 8 56
30 38VMA360HDS5-1 38VMA360HDS6-1 10 + 10 + 10 59
32 38VMA384HDS5-1 38VMA384HDS6-1 12 + 10 + 10 63
34 38VMA408HDS5-1 38VMA408HDS6-1 12 + 12 + 10 64
36 38VMA432HDS5-1 38VMA432HDS6-1 12 + 12 + 12 64
+ +
Total length of liquid pipe size
at 7/8 in.
(ft) × 0.255 (lbs/ft)
Total length of liquid pipe size
at 3/4 in.
(ft) × 0.181 (lbs/ft)
Total length of liquid pipe size
at 5/8 in.
(ft) × 0.120 (lbs/ft)
+ +
Total length of liquid pipe size
at 1/2 in.
(ft) × 0.080 (lbs/ft)
Total length of liquid pipe size
at 3/8 in.
(ft) × 0.040 (lbs/ft)
Total length of liquid pipe size
at 1/4 in.
(ft) × 0.015 (lbs/ft)
+
R*=
+
Number of Y-joints
Equivalent pipe length of 1.6 ft.
7

II.Refrigerant Circuit
1. Refrigerant Circuit Diagram
Figure 17 - 38VMA072, 096, 120HDS
8

Figure 18 - 38VMA144HDS
9

Table 3 - 38VMA072, 096, 120,144HDS
No. in refrigerant
system diagram
Symbol Name Major Function
A INV Inverter compressor Inverter compressor is operated on frequencies between 20 Hz and 100 Hz.
B INV1 Inverter compressor
C Heat exchanger To exchange heat with ambient environment.
D FAN A Left Inverter fan The fan is operated at 13-step rotation speed by using the inverter.
E FAN B Right Inverter fan The fan is operated at 13-step rotation speed by using the inverter.
F EXV A Electronic expansion valve Used to adjust refrigerant volume.
G EXV B Electronic expansion valve Used to adjust refrigerant volume.
H EXV C Electronic expansion valve Used to adjust sub-cooling.
I PHE Plate Heat Exchanger Used for sub-cooling liquid refrigerant from the electronic expansion valve.
J SV4 Solenoid valve Used to balance the oil between modules.
K SV7 Solenoid valve
This valve opens at a pressure of 565.6 psi to prevent pressure from
increasing.
L ST1 4-way valve Used to switch the operation mode between cooling and heating.
M H-LY1 High pressure sensor Used to detect high pressure.
N L-LY1 Low pressure sensor Used to detect low pressure.
O H-PRO High pressure switch
Used to protect the system pressure. When system pressure is too high, the
pressure switch will open. Once the pressure switch is open, compressor
will stop and will restart after 12 minutes.
P L-PRO Low pressure switch
Used to protect the system pressure. When the system pressure is too low,
the pressure switch will open. Once the pressure switch is open,
compressor will stop, and will restart after 12 minutes.
Q Pressure regulating valve
This valve opens at a pressure of 580 psig to prevent pressure from
increasing, thus resulting in no damage to functional parts due to the
increase of pressure in transportation or storage.
R Oil separator
Used to separate oil from high pressure and high temperature refrigerant,
which is pumped out during compression.
S Accumulator
Used to store the liquid refrigerant and oil. It can protect the compressor
from liquid slugging.
T T3 Thermistor (outdoor coil deicer)
Used to detect liquid pipe temperature of ODU heat exchanger, determine
defrosting operation, and others.
1 T4 Thermistor (Outdoor air) Used to detect outdoor / ambient temperature.
2 T5 Thermistor (liquid pipe) Detects temperature of liquid pipe after Plate Heat Exchanger.
3 T6 Thermistor (Plate Heat
Exchanger gas pipe)
Detects temperature of gas pipe on the evaporation side of Plate Heat
Exchanger. Used to maintain constant control on superheated of the Plate
Heat Exchanger.
4 T7 Thermistor (Accumulator outlet) Used to detect gas pipe temperature at the accumulator outlet.
5 INV Gas Thermistor (INV discharge pipe)
Used to detect discharge pipe temperature. Enables the temperature
protection control of compressor, and others.
6 INV1 Gas Thermistor (INV1 discharge pipe)
Used to detect discharge pipe temperature. Enables the temperature
protection control of compressor, and others.
10

2. Functional Parts Layout
Figure 19 - 38VMA072, 096, 120HDS
11

Figure 20 - 38VMA0144HDS
12

3. Refrigerant Flow for Each Operational Mode
a. 38VMA072, 096, 120HDS
Figure 21 – Cooling Operation
13

Figure 22 – Cooling Oil Return
14

Figure 23 - Heating Oil Return and Defrost
15

Figure 24 - Heating Operation
16

b. 38VMA144HDS
Figure 25 - Cooling Operation
17

Figure 26 - Cooling Oil Return
18

Figure 27 - Heating Oil Return and Defrost
19

Figure 28 - Heating Operation
20