Mitsubishi Electric NTXMSM36A142BA Operating manual

TECHNICAL & SERVICE MANUAL
OUTDOOR UNIT
No. OCHT810
REVISED EDITION-A
HFC
utilized
R410A
September 2023
Note:
• Specifications have been
changed in REVISED
EDITION-A.
Model name
indication
PARTS CATALOG (OCBT810)
CONTENTS
1. SAFETY PRECAUTION ·······················2
2. OVERVIEW OF UNITS ························ 5
3. SPECIFICATIONS ···························· 11
4. DATA·············································· 14
5. OUTLINES AND DIMENSIONS ··········· 36
6. WIRING DIAGRAM ··························· 37
7. NECESSARY CONDITIONS
FOR SYSTEM CONSTRUCTION········· 40
8. TROUBLESHOOTING ······················· 55
9. ELECTRICAL WIRING ·····················133
10. REFRIGERANT PIPING TASKS ·········139
11. DISASSEMBLY PROCEDURE ···········147
12. REMOTE CONTROLLER ··················168
<Outdoor unit>
[Model Name]
NTXMSM36A142BA
NTXMSM48A182BA
NTXMSM60A182BA
NTXMSH36A142BA
NTXMSH42A152BA
NTXMSH48A182BA
OCHT810 is void.

2
OCHT810A
Cautions for units utilizing refrigerant R410A
1-2. CAUTIONS RELATED TO NEW REFRIGERANT
1SAFETY PRECAUTION
1-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply circuit must be disconnected.
Precautions during the repair service
• Do not perform the work involving the electric parts with wet
hands.
• Do not pour water into the electric parts.
• Do not touch the refrigerant.
•
Do not touch the hot or cold areas in the refrigerating
cycle.
• When the repair or the inspection of the circuit needs
to be done without turning o󰀨 the power, exercise great
caution not to touch the live parts.
•
When opening or closing the valve below freezing
temperatures, refrigerant may spurt out from the gap
between the valve stem and the valve body, resulting in
injuries.
Preparation before the repair service
• Prepare the proper tools.
• Prepare the proper protectors.
• Provide adequate ventilation.
• After stopping the operation of the air conditioner, turn
o󰀨 the power-supply breaker.
• Discharge the condenser before the work involving the
electric parts.
Use new refrigerant pipes.
Avoid using thin pipes.
Use a vacuum pump with a reverse ow check
valve.
Vacuum pump oil may ow back into refrigerant cycle and
that can cause deterioration of refrigerant oil, etc.
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that
can cause deterioration of refrigerant oil or malfunction of
compressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigera-
nt will change and the e󰀩ciency will be lowered.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a ame, poisonous gases will be released.
Use the following tools specically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A
refrigerant.
Tools for R410A
Gauge manifold Flare tool
Charge hose Size adjustment gauge
Gas leak detector Vacuum pump adaptor
Torque wrench Electronic refrigerant
charging scale
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contaminants
such as sulfur, oxides, dirt, shaving particles,
etc.,
which are hazard to refrigerant cycle.
In addition, use pipes with specied thickness.
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil, etc.
Store the piping indoors, and keep both ends of
the piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
If dirt, dust or moisture enters into refrigerant cycle, that
can cause deterioration of refrigerant oil or malfunction of
compressor.
Follow the instructions below to prevent abrasive
components contained in sandpaper and cutting
tools from entering the refrigerant circuit because
those components can cause failures of the
compressor and valves.
• To deburr pipes, use a reamer or other deburring tools,
not sandpaper.
• To cut pipes, use a pipe cutter, not a grinder or other tools
that use abrasive materials.
• When cutting or deburring pipes, do not allow cutting
chips or other foreign matters to enter the pipes.
• If cutting chips or other foreign matters enter pipes, wipe
them o󰀨 the inside of the pipes.

3
OCHT810A
2
Electronic weighing scale
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
[1] Cautions for service
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them.
[2] Additional refrigerant charge
When charging directly from cylinder
(1) Check that cylinder for R410A on the market is a syphon type.
(2) Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
No. Tool name Specifications
1Gauge manifold · Only for R410A
· Use the existing fitting specifications. (UNF1/2)
· Use high-tension side pressure of 768.7 PSIG [5.3 MPa.G] or over.
2Charge hose · Only for R410A
· Use pressure performance of 738.2 PSIG [5.09 MPa.G] or over.
3Electronic weighing scale —
4Gas leak detector · Use the detector for R134a, R407C or R410A.
5Adaptor for reverse flow check · Attach on vacuum pump.
6Refrigerant charge base —
7Refrigerant cylinder · Only for R410A · Top of cylinder (Pink)
· Cylinder with syphon
8Refrigerant recovery equipment —
Use the specied refrigerant only.
Never use any refrigerant other than that specied.
Doing so may cause a burst, an explosion, or re when
the unit is being used, serviced, or disposed of.
Correct refrigerant is specied in the manuals and on the
spec labels provided with our products.
We will not be held responsible for mechanical failure,
system malfunction, unit breakdown or accidents caused
by failure to follow the instructions.
The refrigerant oil applied to are and ange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
If large amount of mineral oil enters, that can cause
deterioration of refrigerant oil, etc.
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the e󰀩ciency will be
lowered.
Do not use refrigerant other than R410A.
If other refrigerant (R22, etc.) is used, chlorine in refrige-
rant can cause deterioration of refrigerant oil, etc.
Do not pump down the system when a gas leak
has been detected.
The intake of air or other gases causes abnormally high
pressure in the refrigeration cycle, which may cause
explosion or injury.

4
OCHT810A
Cautions for refrigerant piping work
New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is same as
for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the working pressure
of R410A is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.
Thickness of pipes
Because the working pressure of R410A is higher compared to R22, be sure to use refrigerant piping with thickness shown
below. (Never use pipes of 7/256 in [0.7 mm] or below.)
2Dimensions of flare cutting and flare nut
The component molecules in HFC refrigerant are smaller compared to conventional refrigerants. In addition to that, R410A
is a refrigerant, which has higher risk of leakage because its working pressure is higher than that of other refrigerants.
Therefore, to enhance airtightness and strength, flare cutting dimension of copper pipe for R410A has been specified sepa-
rately from the dimensions for other refrigerants as shown below. The dimension B of flare nut for R410A also has partly
been changed to increase strength as shown below. Set copper pipe correctly referring to copper pipe flaring dimensions for
R410A below. For 1/2 and 5/8 inch pipes, the dimension B changes.
Use torque wrench corresponding to each dimension.
3Tools for R410A (The following table shows whether conventional tools can be used or not.)
1/4
3/8
1/2
5/8
3/4
Ø6.35
Ø9.52
Ø12.70
Ø15.88
Ø19.05
1/32 [0.8]
1/32 [0.8]
1/32 [0.8]
5/128 [1.0]
5/128 [1.0]*
1/32 [0.8]
1/32 [0.8]
1/32 [0.8]
5/128 [1.0]
5/128 [1.0]
Nominal
dimensions
(in)
Diagram below: Piping diameter and thickness
Outside
diameter (mm)
Thickness : in [mm]
R410A
*Use 1/2 H or H pipes.
R22
1/4
3/8
1/2
5/8
3/4
Ø6.35
Ø9.52
Ø12.70
Ø15.88
Ø19.05
11/32-23/64 [ 9.1]
1/2-33/64 [13.2]
41/64-21/32 [16.6]
49/64-25/32 [19.7]
—
9.0
13.0
16.2
19.4
23.3
Nominal
dimensions (in)
Flare cutting dimensions
Outside
diameter (mm)
Dimension A ( )
0
-0.4
Unit : in [mm]
R410A R22
1/4
3/8
1/2
5/8
3/4
Ø6.35
Ø9.52
Ø12.70
Ø15.88
Ø19.05
43/64 [17.0]
7/8 [22.0]
1-3/64 [26.0]
1-9/64 [29.0]
17.0
22.0
24.0
27.0
36.0
Nominal
dimensions (in)
Flare nut dimensions
Outside
diameter (mm)
Dimension B
Unit: in [mm]
R410A R22
—
Gauge manifold
Charge hose
Gas leak detector
Refrigerant recovery equipment
Refrigerant cylinder
Applied oil
Safety charger
Charge valve
Vacuum pump
Flare tool
Bender
Pipe cutter
Welder and nitrogen gas cylinder
Refrigerant charging scale
Vacuum gauge or thermis-
tor vacuum gauge and
vacuum valve
Charging cylinder
Air purge, refrigerant charge
and operation check
Gas leak check
Refrigerant recovery
Refrigerant charge
Apply to flared section
Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant
Prevent gas from blowing out
when detaching charge hose
Vacuum drying and air
purge
Flaring work of piping
Bend the pipes
Cut the pipes
Weld the pipes
Refrigerant charge
Check the degree of vacuum. (Vacuum
valve prevents back flow of oil and refri-
gerant to thermistor vacuum gauge)
Refrigerant charge
Tool exclusive for R410A
Tool exclusive for R410A
Tool for HFC refrigerant
Tool exclusive for R410A
Tool exclusive for R410A
Ester oil, ether oil and
alkylbenzene oil (minimum amount)
Tool exclusive for R410A
Tool exclusive for R410A
Tools for other refrigerants can
be used if equipped with adop-
ter for reverse flow check
Tools for other refrigerants
can be used by adjusting
flaring dimension
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants
can be used
Tool exclusive for R410A
Tools and materials Use R410A tools Can R22 tools be used?
(Usable if equipped
with adopter for rever-
se flow)
(Usable by adjusting
flaring dimension)
Can R407C tools be used?
Ester oil, ether oil:
Alkylbenzene oil: minimum amount
(Usable if equipped
with adopter for rever-
se flow)
(Usable by adjusting
flaring dimension)
: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
: Tools for other refrigerants can be used under certain conditions.
: Tools for other refrigerants can be used.
Dimension A
Dimension B
1

45
OCHT810A
2OVERVIEW OF UNITS
2-1. Auxiliary HEATING ON/OFF CONTROL SET-UP
(1) Auxiliary heating operation controls another heat source that depends on the main system's
operations, which means the interlock operation shown in "b)" will be possible.
a) Indoor unit must be R410A UL model for this function to operate.
b) Different Indoor unit applications that can be applied:
(2) Outdoor unit DIPSW5-4 for auxiliary heating control:
Set DIPSW5-4 when power is turned off at unit.
OFF: Disable auxiliary Heating Function (Initial setting)
ON: Enable auxiliary Heating Function
(3) Determine required indoor fan speed during defrost mode:
To set the fan speed, see the chapter referring to heater control in the indoor unit’s Technical &
Service Manual.
OC
Electric Heating
or
Hot water Heating
4 way
Cassette
type
Ceiling
Suspended
type
Wall
Mounted
type
Floor
Standing
type
Ducted
type

6
OCHT810A
When the set temperature ranges overlap, the previously set pattern (1, 2 or 3) has a priority.
The stage 1 has the highest priority, 2 the second and then 3.
b) Based on above chart listed the sequence of operation on "On ambient decrease"
Stage 1: (TH7 ≥50°F [10
˚C ]): the outdoor unit runs in HP mode.
Stage 2: (TH7 = 50 to −13°F [10
to −25 ˚C ]): the outdoor unit runs in HP mode with auxiliary heating.
Stage 3: (TH7 ≤−13°F [−25
˚C ]): Auxiliary heating only (Outdoor unit is OFF).
c) Based on above chart listed the sequence of operation on "On ambient increase"
Stage 3: (TH7 ≤32°F [0
˚C ]): Auxiliary heating only (Outdoor unit is OFF).
Stage 2: (TH7 ≥32 to 68
˚F [0 to 20 ˚C ]): Auxiliary heating with outdoor unit in HP mode.
Stage 1: (TH7 ≥68
˚F [20 ˚C ]): Outdoor unit in HP mode only.
(4) Determine fan speed setting during indoor thermo-OFF conditions:
a) These settings are done within Indoor DIPSW1-7 and DIPSW1-8, see chart below for options.
b) Recommended SW1-7 OFF and SW1-8 ON will determine airflow based on "Setting on the remote controller".
(5) Setting outdoor unit and auxiliary heat switch over temperatures
When the DIPSW 5-4 is set to "ON", the outdoor unit and the contact output operates as shown below.
a)Outdoor default setting and operations are shown below:
Auxiliary heating
signal
Fan speed
setting
Fan speed
setting
OC IC3 IC2 IC1
RA17°C RA19°C RA21°C
20°C 20°C 20°C
Thermo - ON Thermo - ON Thermo - OFF
Baseboard Heating
Thermo condition OFF ON
SW1-7 SW1-8
OFF OFF Very low Setting
on remote
controller
ON OFF Low
OFF ON Setting on remote
controller
ON ON Stopped
Stage 1
A
mb. decreasing - Outdoor unit HP operation
Amb. increasing - Defrost : Heater contact ON signal
- Other than defrost : Contact OFF
Stage 2
- Outdoor unit HP operation
- Heater contact ON signal
Stage 3
- Outdoor unit OFF (Standby)
- Heater contact ON signal
TH7 = Outdoor temperature
a
− 13°F
[ −25 °C]
b
32°F
[ 0 °C]
c
50°F
[ 10 °C]
d
68°F
[ 20 °C]

7
OCHT810A
(6) Locally procured wiring
A basic connection method is shown.
(i.e. interlocked operation with the electric heater with the fan speed setting on high)
Recommended circuit
CN24
CN22
X
+
X
Remote control Board Relay circuit Adapter
Indoor unit
control board
Outdoor unit
control board
Electric Heater power source
Electric
Heater
Red 1
White 2
Dip switch
SW5-4 "ON"
Preparations in the field Maximum cable length
is 10 m (32ft)
Red 1
Red 2
YellowGreen
FS1
FS2
FS1
FS2
R
S
R
S
CN24
H2
88H
H1
88H
26H
88H
1-phase power
supply
208V, 230V/60Hz
Control board
FS1, 2 ----- Thermal fuse
H1, H2 ----- Heater
26H --------- Overheat protection
thermostat
88H --------- Electromagnetic contactor
Wiring diagram
For relay X use the specifications given below operation coil
Rated voltage: 12 V DC
Power consumption: 0.9 W or less
*Use the diode that is recommended by the relay manufacturer at both ends of the relay coil.
The length of the electrical wiring for the PAC-YU24HT is 2 meters (6-1/2 ft)
To extend this length, use sheathed 2-core cable.
Control cable type: CVV, CVS, CPEV, or equivalent.
Cable size: 0.5 mm2to 1.25 mm2(AWG22 to AWG16)
Do not extend the cable more than 10 meters (32 ft).

8
OCHT810A
Connectable indoor unit lineup
Model type Model name 04 05 06 08 12 15 18 24 27 30 36 48 54 72
Ceiling
Cassette
4-way ow TPLFYP EM14** ●●●● ●●●
2 by 2 TPLFYP FM14** ● ●●●●
1-way flow TPLFYP BM14** ●●●●
Ceiling Concealed TPEFYP MA14** ●●●●●●●●●●●
MS14** ●●●●●●
MH14** ●●●●●●●●
MH140*●*
Wall Mounted TPKFYP KM14** ● ●
LM14** ● ●●●●●
Ceiling Suspended TPCFYP KM14** ● ● ● ●
Floor
standing
Exposed TPFFYP CS14** ●●●●●●
Concealed RE14** ●●●●●●
Multi-position air
handling unit
TPVFYP AM14** ●● ●● ●●●●
* Only NTXMSM60 is connectable.
Outdoor unit 4HP 4.5HP 5HP 7HP
NTXMSM36A142BA
NTXMSH36A142BA NTXMSH42A152BA NTXMSM48A182BA
NTXMSH48A182BA NTXMSM60A182BA
Applicable
indoor unit
Capacity 04 to 36 04 to 54 04 to 72
Number of units 1 to 11 1 to 12
Total system
capacity range 50 to 130% of outdoor unit capacity
Remote controller Name M-NET remote controller MA remote controller
Model number PAR-F27MEA-E, TAR-U01MEDU TAR-40MAA
Functions • A handy remote controller for use in conjunction
with the Melans centralized management system.
• Addresses must be set.
• Addresses setting is not necessary.
Model name CMY-Y62-G-E CMY-Y64-G-E CMY-Y68-G-E
Number of branches 2 4 8
2-2. SYSTEM CONSTRUCTION

9
OCHT810A
Outdoor unit Model name NTXMSM36A142BA
NTXMSH36A142BA NTXMSH42A152BA NTXMSM48A182BA
NTXMSH48A182BA NTXMSM60A182BA
Horse power 4HP 4.5HP 5HP 7HP
Applicable
indoor unit
Capacity class Type 06 to Type 36
Caution: The indoor unit which rated capacity exceeds
36 kBtu/ h (Type 36) can NOT be connected.
Number of units 2(*1) to 4 2(*1) to 5 2(*1) to 8 2(*1) to 8
Total system
capacity range
33 to 130% of outdoor
unit capacity
29 to 130% of outdoor
unit capacity
25 to 130% of outdoor
unit capacity
20 to 130% of outdoor
unit capacity
12 to 46.8 kBtu/h 12 to 54.6 kBtu/h 12 to 62.4 kBtu/h 12 to 78 kBtu/h
Branch box that can
be connected
Number of units 1 or 2
Connectable indoor unit lineups (Heat pump inverter type)
Model type Model name 06 09 12 15 18 24 30 36
Wall-mounted Deluxe N*XWPH*A112A*
N*XWPH**B112A*●●●●●
Standard N*XWST**A112A*
N*XWST**B112A*●●●●●●
Ducted Low static*3 *4 N*XDKS**A112A*●●●●
P-series mid static*3 *4 *PEADA0**1AA80*●●●●●●●
1-way ceiling cassette N*XUKS**A112A**6
N*XUKS**A112B*● ● ● ●
4-way ceiling
cassette
P-series 22*22 N*XCKS**A112A*●●●
P-series 33*33 *PLA0A0**1EA70**5 ● ●●●●
Floor standing N*XFKS**A112A*●●●●
Standard Multi-position air handler*2 N*XAMT**A112A*● ●●●●
●Models other than NTXMSM60A182BA (For each connected branch box)
Number of connecting
multi-position unit Constraints
2
Any indoor units other than ducted units are not connectable.
1
· The total system wide capacity should be 130% or below
including the ducted unit.
· Only 1 ducted unit can be included in the connection.
Option Optional accessories for indoor units and outdoor units are available.
Branch box TAC-MKA52BC TAC-MKA32BC
Number of branches
(Indoor unit that can be connected) 5 (MAX. 5 units) 3 (MAX. 3 units)
Note: A maximum of 2 branch boxes can be connected to 1 outdoor unit.
●NTXMSM60A182BA (For each connected branch box)
Number of connecting
multi-position unit
Constraints
2
Any indoor units other than ducted unit are not
connectable.
1
· The total system wide capacity should be 100% or
below including the ducted unit.
· Only 1 ducted unit can be included in the connection.
*3 For NTXMSM60A182BA; When connecting the N*XDKS and *PEAD-series units, the total system wide capacity per 1 branch box should be 100% or below
including the
ducted unit s. (Only if connecting to branch box)
*4 When not outside units 60: A branch box can connect to maximum 3 of the
ducted unit s. When connecting with 3 of the ducted unit sper 1 branch box, other
indoor units cannot be connected.
When outside units 60: A branch box can connect to maximum 2 of the
ducted unit s. When connecting with 1 and over 1 of the ducted unit s, the total ability
including of the ducted unit s is 100% and below 100%.
*5 When 1 or more TPLA0A0 units is connected, the number of the maximum connectable indoor units is decreased as follows:
3 for NTXMSM36A142BA and NTXMSH36A142BA, 4 for NTXMSH42A152BA, and 6 for NTXMSM48A182BA, NTXMSH48A182BA and NTXMSM60A182BA
*6 Only NTXMSM36/48 and NTXMSH36/42/48 are connectable.
*1 Only one
unit connection is possible with ducted unit.
*2
When connecting a multi-position unit(s), set additional constraints as follows. For connections other than those specied below, consult your dealer.
Note:Select a model according to the connection method.
2- branch pipe (joint), Optional parts Model name Note
Using 1 branch box No required
Using 2 branch boxes MSDD-50AR-E Connection method: are
MSDD-50BR-E Connection method: brazing
2-3 SYSTEM CONSTRUCTION( BRANCH BOX SYSTEM)

10
OCHT810A
2-4. SYSTEM SPECIFICATIONS
(2) Method for identifying
(1) Outdoor Unit
Smart Multi
Capacity class
Unit Configuration
M = Multi-split outdoor unit
Maximum number of connectable
N*X,T(A)P*A series indoor units
N T X 3 6M S M A 1 4 2 B A
Cooling/Heating capacity indicates the maximum value at operation under the following condition.
Cooling Indoor D.B. 80°F/W.B. 67°F: [D.B. 26.7°C/W.B. 19.4°C]
Outdoor D.B. 95°F/W.B. 75°F: [D.B. 35°C/W.B. 23.9°C]
Heating Indoor D.B. 70°F/W.B. 60°F: [D.B. 21.1°C/W.B. 15.6°C]
Outdoor D.B. 47°F/W.B. 43°F: [D.B. 8.3°C/W.B. 6.1°C]
Outdoor
unit Model name NTXMSM36A142BA NTXMSH36A142BA NTXMSH42A152BA NTXMSM48A182BA NTXMSH48A182BA NTXMSM60A182BA
Capacity Cooling (kBtu/h) 36 42 48 60
Heating (kBtu/h) 41 42 48 50 54 66

10 11
OCHT810A
3SPECIFICATIONS
Service Ref. NTXMSM36A142BA NTXMSM48A182BA
Indoor type Non-Ducted Mix Ducted Non-Ducted Mix Ducted
Cooling
Capacity Rated*1Btu/h 36,000 36,000 36,000 48,000 48,000 48,000
Rated power consumption*1W2,400 2,740 3,190 3,665 4,090 4,615
Current input (208/230V) A11.7/10.6 13.4/12.1 15.6/14.1 17.9/16.2 20.0/18.1 22.5/20.4
EER2 Btu/h/W 15.00 13.15 11.30 13.10 11.75 10.40
SEER2 -23.00 19.30 15.60 23.00 18.85 14.70
Heating
Capacity Rated 47°F*1Btu/h 41,000 41,000 41,000 50,000 50,000 50,000
Capacity Max. 17°F*2Btu/h 36,000 36,000 36,000 43,000 43,000 43,000
Capacity Max. 5°F Btu/h 29,000 29,000 29,000 35,400 35,400 35,400
Rated power consumption 47°F*1W3,005 3,250 3,535 3,665 4,075 4,580
Current input (208/230V) A14.7/13.3 15.9/14.3 17.3/15.6 17.9/16.2 19.9/18.0 22.4/20.2
COP 47°F*1W/W 4.00 3.70 3.40 4.00 3.60 3.20
HSPF2 / -11.00/8.75 9.80/8.05 8.60/7.40 10.40/8.35 9.35/7.90 8.30/7.50
Power supply 1-phase 208/230 V, 60 Hz
Breaker Size/Maximum over current protection 30 A/64 A (When power is supplied separately)
40 A/70 A (When power is supplied from the outdoor unit)
Minimum circuit ampacity 36 A (When power is supplied separately)
42 A (When power is supplied from the outdoor unit)
Indoor unit
connectable
Total capacity 50 to 130% of outdoor unit capacity
Model/Quantity *3CITY MULTI 04 - 36/11 04 - 54/12
Branch box 06 - 36/4 06 - 36/8
Sound pressure level
(measured in anechoic room) dB <A> 49/53 51/54
Refrigerant
piping diameter
Liquid pipe inch (mm) 3/8 (ø9.52)
Gas pipe inch (mm) 5/8 (ø15.88)
Fan Type × Quantity Propeller fan × 2
Airow rate m³/min 110
L/s 1,834
cfm 3,885
Control, Driving mechanism DC control
Motor output kW 0.074 × 2
External static press. 0
Compressor Type × Quantity Scroll hermetic compressor x 1
Manufacture Mitsubishi Electric Corporation
Starting method Inverter
Motor output kW 2.8 3.4
Case heater kW 0
Lubricant FV50S 78oz. (2.3L)
External nish Galvanized Steel Sheet <Munsell 3Y 7.8/ 1.1>
External dimension H × W × D mm 1,338 × 1,050 × 330 (+25)
inch 52-11/16 × 41-11/32 × 13 (+1)
Protection
devices
High pressure protection High pressure switch
Inverter circuit (COMP./FAN) Overcurrent detection, Overheat detection (Heat sink thermistor)
Compressor protection Compressor thermo, Overcurrent detection
Fan motor protection Overheating/Voltage protection
Refrigerant Type × original charge R410A 10 lbs. 9 oz. (4.8kg)
Control Linear Expansion Valve
Net weight lb (kg) 271 (123)
Heat exchanger Cross n and tube
HIC circuit (HIC: Heat Inter-Changer) HIC circuit
Defrosting method Reversed refrigerant circuit
Guaranteed operation range (Cooling) D.B 23 to 115°F [ D.B.-5 to 46°C ] *4*5*6
(Heating) D.B.-13 to 70°F [D.B. -25 to 21°C ]
Remarks Details on foundation work, duct work, insulation work, electrical wiring, power source switch, and
other items shall be referred to the Installation Manual.
Due to continuing improvement, above specications may be subject to change without notice.
*1Rating conditions Cooling Indoor : D.B. 80°F/W.B. 67 °F [D.B.26.7°C/W.B. 19.4°C]
Outdoor : D.B. 95°F [D.B. 35.0°C]
Heating Indoor : D.B. 70°F [D.B. 21.1°C]
Outdoor : D.B. 47°F/W.B. 43°F [D.B. 8.3°C/W.B. 6.1°C]
*2Conditions Heating Indoor : D.B. 70°F [D.B. 21.1°C]
Outdoor : D.B. 17°F/W.B. 15°F [D.B. −8.3°C/W.B. −9.4°C]
*3 It cannot be connected mixed CITY MULTI indoor unit and branch box indoor unit.
*4 D.B. 5 to 115°F [D.B. -15 to 46°C], when an optional Air Outlet Guide is installed.
However, this condition does not apply to the indoor units listed in *5.
*5 50 to 115°F (10 to 46°C) D.B.: When connecting TPKFYP004/006/008/012LM14**, TPFFYP006/008/012CS14**, and TPFFYP006/008/012RE14** type indoor unit.
*6 When the temperature is below D.B. 50°F [D.B. 10°C] with branch box system, noise could potentially occur.
Note: Refer to the indoor unit's service manual for the indoor units specications.
Conversion formula:
kcal/h = kW o860
Btu/h = kW o3412
CFM = m3/min o35.31

12
OCHT810A
Service Ref. NTXMSH36A142BA NTXMSH42A152BA NTXMSH48A182BA
Indoor type
Non-Ducted Mix Ducted Non-Ducted Mix Ducted Non-Ducted Mix Ducted
Cooling
Capacity Rated*1Btu/h 36,000 36,000 36,000 42,000 42,000 42,000 48,000 48,000 48,000
Rated power consumption*1W2,400 2,740 3,190 3,135 3,500 3,965 3,665 4,090 4,615
Current input (208/230V) A 11.7/10.6 13.4/12.1 15.6/14.1 15.3/13.8 17.1/15.4 19.4/17.5 17.9/16.2 20.0/18.1 22.5/20.4
EER2 Btu/h/W 15.00 13.15 11.30 13.40 12.00 10.60 13.10 11.75 10.40
SEER2 - 23.00 19.30 15.60 21.50 18.85 14.70 23.00 18.85 14.70
Heating
Capacity Rated 47°F*1Btu/h 42,000 42,000 42,000 48,000 48,000 48,000 54,000 54,000 54,000
Capacity Max. 17°F*2Btu/h 42,000 42,000 42,000 48,000 48,000 48,000 54,000 54,000 54,000
Capacity Max. 5°F Btu/h 38,500 38,500 38,500 44,000 44,000 44,000 47,000 47,000 47,000
Rated power consumption 47°F*1W3,080 3,330 3,620 3,435 3,805 4,265 3,960 4,400 4,950
Current input (208/230V) A 15.0/13.6 16.3/14.7 17.7/16.0 16.8/15.2 18.6/16.8 20.8/18.8 19.3/17.5 21.5/19.4 24.2/21.8
COP 47°F*1W/W 4.00 3.70 3.40 4.10 3.70 3.30 4.00 3.60 3.20
HSPF2 / - 12.00/10.65 10.95/9.70 9.90/8.80 11.10/9.80 10.10/9.30 9.10/8.80 11.50/9.80 10.15/9.05 8.80/8.30
Power supply 1-phase 208/230 V, 60 Hz
Breaker Size/Maximum over current protection 40 A/80 A (When power is supplied separately)
45 A/86 A (When power is supplied from the outdoor unit)
Minimum circuit ampacity 45 A (When power is supplied separately)
51 A (When power is supplied from the outdoor unit)
Indoor unit
connectable
Total capacity 50 to 130% of outdoor unit capacity
Model/Quantity *3 CITY MULTI 04 - 36/11 04 - 54/12 04 - 54/12
Branch box 06 - 36/4 06 - 36/5 06 - 36/8
Sound pressure level
(measured in anechoic room) dB <A> 49/53 50/54 51/54
Refrigerant
piping diameter
Liquid pipe inch (mm) 3/8 (ø9.52)
Gas pipe inch (mm) 5/8 (ø15.88)
Fan Type × Quantity Propeller fan × 2
Airow rate m³/min 110
L/s 1,834
cfm 3,885
Control, Driving mechanism DC control
Motor output kW 0.074 × 2
External static press. 0
Compressor Type × Quantity Scroll hermetic compressor × 1
Manufacture Mitsubishi Electric Corporation
Starting method Inverter
Motor output kW 2.8 2.9 3.4
Case heater kW 0
Lubricant FV50S 78oz. (2.3L)
External nish Galvanized Steel Sheet <Munsell 3Y 7.8/ 1.1>
External dimension H × W × D mm 1,338 × 1,050 × 330 (+25)
inch 52-11/16 × 41-11/32 × 13 (+1)
Protection
devices
High pressure protection High pressure switch
Inverter circuit (COMP./FAN) Overcurrent detection, Overheat detection (Heat sink thermistor)
Compressor protection Compressor thermo, Overcurrent detection
Fan motor protection Overheating/Voltage protection
Refrigerant Type x original charge R410A 10 lbs. 9 oz. (4.8kg)
Control Linear Expansion Valve
Net weight lb (kg) 278 (126)
Heat exchanger Cross n and tube
HIC circuit (HIC: Heat Inter-Changer) HIC circuit
Defrosting method Reversed refrigerant circuit
Guaranteed operation range (Cooling) D.B 23 to 115°F [D.B.-5 to 46°C] *4*5*6
(Heating) D.B. -13 to 70°F [D.B. -25 to 21°C]
Remarks Details on foundation work, duct work, insulation work, electrical wiring, power source switch, and other items
shall be referred to the Installation Manual.
Due to continuing improvement, above specications may be subject to change without notice.
*1Rating conditions Cooling Indoor : D.B. 80°F/W.B. 67 °F [D.B.26.7°C/W.B. 19.4°C]
Outdoor : D.B. 95°F [D.B. 35.0°C]
Heating Indoor : D.B. 70°F [D.B. 21.1°C]
Outdoor : D.B. 47°F/W.B. 43°F [D.B. 8.3°C/W.B. 6.1°C]
*2Conditions Heating Indoor : D.B. 70°F [D.B. 21.1°C]
Outdoor : D.B. 17°F/W.B. 15°F [D.B. −8.3°C/W.B. −9.4°C]
*3 It cannot be connected mixed CITY MULTI indoor unit and branch box indoor unit.
*4 D.B. 5 to 115°F [D.B. -15 to 46°C], when an optional Air Outlet Guide is installed.
However, this condition does not apply to the indoor units listed in *5.
*5 50 to 115°F (10 to 46°C)D.B.: When connecting TPKFYP004/006/008/012LM14**, TPFFYP006/008/012CS14**, and TPFFYP006/008/012RE14** type indoor unit.
*6 When the temperature is below D.B. 50°F [D.B. 10°C] with branch box system, noise could potentially occur.
Note: Refer to the indoor unit's service manual for the indoor units specications.
Conversion formula:
kcal/h = kW o860
Btu/h = kW o3412
CFM = m3/min o35.31

13
OCHT810A
Service Ref. NTXMSM60A182BA
Indoor type Non-Ducted Mix Ducted
Cooling
Capacity Rated*1Btu/h 60,000 60,000 60,000
Rated power consumption*1W4,515 5,065 5,770
Current input (208/230V) A 21.9/19.8 24.6/22.3 28.0/25.4
EER2 Btu/h/W 13.30 11.85 10.40
SEER2 - 20.00 17.75 15.50
Heating
Capacity Rated 47°F*1Btu/h 66,000 66,000 66,000
Capacity Max. 17°F*2Btu/h 65,000 65,000 65,000
Capacity Max. 5°F Btu/h 46,500 46,500 46,500
Rated power consumption 47°F*1W4,720 5,175 5,690
Current input (208/230V) A 22.9/20.7 25.2/22.8 27.7/25.0
COP 47°F*1W/W 4.10 3.74 3.40
HSPF2 / - 10.50/8.65 9.55/8.05 8.60/7.45
Power supply 1-phase 208/230 V, 60 Hz
Breaker Size/Maximum over current protection 40 A/80 A (When power is supplied separately)
50 A/90 A (When power is supplied from the outdoor unit)
Minimum circuit ampacity 45 A (When power is supplied separately)
55 A (When power is supplied from the outdoor unit)
Indoor unit
connectable
Total capacity 50 to 130% of outdoor unit capacity
Model/Quantity*3CITY MULTI 04 - 72 /12
Branch box 06 - 36 / 8
Sound pressure level
(measured in anechoic room) dB <A> 58/59
Refrigerant
piping diameter
Liquid pipe inch (mm) 3/8 (ø9.52)
Gas pipe inch (mm) 3/4 (ø19.05)
Fan Type × Quantity Propeller fan × 2
Airow rate m³/min 138
L/s 2,300
cfm 4,879
Control, Driving mechanism DC control
Motor output kW 0.200 × 2
External static press. 0
Compressor Type × Quantity Scroll hermetic compressor x 1
Manufacture Mitsubishi Electric Corporation
Starting method Inverter
Motor output kW 3.9
Case heater kW 0
Lubricant FVC68D 78oz. (2.3L)
External nish Galvanized Steel Sheet <Munsell 3Y 7.8/ 1.1>
External dimension H × W × D mm 1,338 × 1,050 × 330 (+25)
inch 52-11/16 × 41-11/32 × 13 (+1)
Protection
devices
High pressure protection High pressure switch
Inverter circuit (COMP./FAN) Overcurrent detection, Overheat detection(Heat sink thermistor)
Compressor protection Compressor thermo, Overcurrent detection
Fan motor protection Overheating/Voltage protection
Refrigerant Type x original charge R410A 11 lbs. 4 oz. (5.1kg)
Control Linear Expansion Valve
Net weight lb (kg) 300 (136)
Heat exchanger Cross n and tube
HIC circuit (HIC: Heat Inter-Changer) HIC circuit
Defrosting method Reversed refrigerant circuit
Guaranteed operation range (Cooling) D.B 23 to 115°F [D.B.-5 to 46°C] *4*5*6
(Heating) D.B. -13 to 70°F [D.B. -25 to 21°C]
Remarks Details on foundation work, duct work, insulation work, electrical wiring, power source switch, and
other items shall be referred to the Installation Manual.
Due to continuing improvement, above specications may be subject to change without notice.
*1Rating conditions Cooling Indoor : D.B. 80°F/W.B. 67 °F [D.B.26.7°C/W.B. 19.4°C]
Outdoor : D.B. 95°F [D.B. 35.0°C]
Heating Indoor : D.B. 70°F [D.B. 21.1°C]
Outdoor : D.B. 47°F/W.B. 43°F [D.B. 8.3°C/W.B. 6.1°C]
*2Conditions Heating Indoor : D.B. 70°F [D.B. 21.1°C]
Outdoor : D.B. 17°F/W.B. 15°F [D.B. −8.3°C/W.B. −9.4°C]
*3 It cannot be connected mixed CITY MULTI indoor unit and branch box indoor unit.
*4 D.B. 5 to 115°F [D.B. -15 to 46°C], when an optional Air Outlet Guide is installed.
However, this condition does not apply to the indoor units listed in *5.
*5 50 to 115°F (10 to 46°C) D.B.: When connecting TPKFYP004/006/008/012LM14**, TPFFYP006/008/012CS14**, and TPFFYP006/008/012RE14** type indoor unit.
*6 When the temperature is below D.B. 50°F [D.B. 10°C] with branch box system, noise could potentially occur.
Note: Refer to the indoor unit's service manual for the indoor units specications.
Conversion formula:
kcal/h = kW o860
Btu/h = kW o3412
CFM = m3/min o35.31

14
OCHT810A
4DATA
4-1. SELECTION OF COOLING/HEATING UNITS
How to determine the capacity when less than or equal 100% indoor model size units are connected in total:
The purpose of this flow chart is to select the indoor and outdoor units. For other purposes, this flow chart is intended only for reference.
No
Yes
Temporarily select the Indoor/Outdoor Units
Reselect the outdoor units
Reselect the indoor units
Reselect the outdoor units
Reselect the indoor units
Indoor Unit
n
Total Indoor Units Capacity (CT
i
) = ∑ (Individual Rated Indoor Unit Capacity CT
ik
×
k=1
Individual Indoor Temperature Correction Coef. αk ) (Figure 1, 4)
Outdoor Unit *1
Outdoor Unit Capacity (CT
o
) = Rated Outdoor Unit Capacity × Outdoor
Temperature Correction Coef. (Figure 2, 5) × Piping Length
Correction Coef. (Figure 3, 6) × Defrost Correction Coef. (in heating operation, Table 1)
Maximum Capacity(CT
max
) = CT
o
Yes
Completed Selecting Units
Want to change to smaller
indoor units?
Does it fulfill the load of
each room?
CT
o
≤ CT
i
L ≤ CT
o
Maximum Capacity(CT
max
) = CT
i
L ≤ CT
i
Need to select smaller
outdoor unit?
Does it fulfill the load of
each room?
Outdoor Unit Input = Rated Outdoor Unit Input ×
c
ave
Determine the load (L) and
the Indoor/Outdoor Temperature
n: Total Number of Indoor Units
k: Indoor Unit Number
Yes
No
No
No
No
Yes
No
No
Yes
Yes
Capacity
Determination
Input
Calculation
Average Indoor temp. power input Coef. (
c
ave) Average Indoor temp. power input Coef. (
c
ave)
c
ave = ∑ {c k
× (M
k
/ ∑ M
k
)}
n
k=1
n
k=1
c
ave = ∑ {c k
× (M
k
/ ∑ M
k
)}
n
k=1
n
k=1
(If indoor to outdoor connectable
capacity ratio is less than 100%, the
capacity correction is set as 100% )
*c
k
: Outdoor unit power input coefficient of k indoor unit room temp. (Refer to 4-2.)
*M
k
: Number part of the k indoor unit model (e.g. P80 → 80)
∑ (CT
im
× αm )
n
m=1
Individual Indoor Unit Capacity: CT'
ik
= CT
max
×
CT
ik
× αk
Outdoor Unit Input = Rated Outdoor Unit Input ×
c
ave
× (CT
i
)
Completed Selecting Units
(x) is the approximate correction function when less than or equal
100% model size units are input as connected.
Yes

15
OCHT810A
14
How to determine the capacity when greater than 100% indoor model size units are connected in total:
No
Yes
Temporarily select the indoor/outdoor units
Reselect the outdoor units
Reselect the indoor units
Reselect the outdoor units
Reselect the indoor units
Indoor Unit
n
Total Indoor Units Capacity (CT
i
) = ∑ (Individual Rated Indoor Unit Capacity CT
ik
×
k=1
Individual Indoor Temperature Correction Coef. αk ) (Figure 1, 4)
Outdoor Unit *1
Maximum Capacity(CT
max
) = CT
o
Yes
Want to change to smaller
indoor units?
Does it fulfill the load of
each room?
CT
o
≤ CT
i
L ≤ CT
o
Maximum Capacity(CT
max
) = CT
i
L ≤ CT
i
Need to select smaller
outdoor unit?
Does it fulfill the load of
each room?
Rated Outdoor Unit Capacity
< Total Indoor Units Capacity
Outdoor Unit Input
= Rated Outdoor Unit Input ×
Outdoor Temperature
Correction
Coef.
× (CT
i
)
Determine the load (L) and
the Indoor/Outdoor Temperature
n: Total Number of Indoor Units
k: Indoor Unit Number
Yes
Yes
No
No
No
No
Yes
No
No
No
Yes
Yes
Yes
Average Indoor temp. power input Coef. (
c
ave)
= ∑ {c
k
× (M
k
/ ∑ M
k
)}
n
k=1
n
k=1
The purpose of this flow chart is to select the indoor and outdoor units. For other purposes, this flow chart is intended only for reference.
*c
k
: Outdoor unit power input coefficient of k indoor unit room temp. (Refer to 4-2.)
*M
k
: Number part of the k indoor unit model (e.g. P80 → 80)
Average Indoor temp. power input Coef. ( c
ave)
c
ave = ∑ {c k
× (M
k
/ ∑ M
k
)}
n
k=1
n
k=1
Outdoor Unit Input =Rated Outdoor Unit Input × c
ave Outdoor Unit Input = Rated Outdoor Unit Input ×
c
ave
× (CTi )
∑ (CT
im
× αm )
n
m=1
Individual Indoor Unit Capacity: CT'
ik
= CT
max
×
CT
ik
× αk
Completed Selecting Units
Completed Selecting Units
(x) is the approximate correction function when greater
than 100% model size units are connected.
(x) refers to STANDARD CAPACITY DIAGRAM.
Outdoor Unit Capacity (CT
o
) = Rated Outdoor Unit Capacity × ( )
× Outdoor Temperature Correction Coef. (Figure 2, 5)
× Piping Length Correction Coef. (Figure 3, 6) × Defrost Correction Coef. (in heating, Table 1)
(x) is the approximate correction function when greater than 100%
model size units are input as connected.
(x) is the approximate correction function when less than or equal
100% model size units are input as connected.
CT
i
× (CTi )
Input
Calculation

16
OCHT810A
(kBtu/h)
<TP•FY series>
Model Number
for indoor unit
Model
004
Model
005
Model
006
Model
008
Model
012
Model
015
Model
018
Model
024
Model
027
Model
030
Model
036
Model
048
Model
054
Model
072
Model
Capacity 4.0 5.0 6.0 8.0 12.0 15.0 18.0 24.0 27.0 30.0 36.0 48.0 54.0 72.0
Capacity of indoor unit
<N*X, T(A)P*A series>
Model name Capacity class
06 09 12 15 18 24 30 36
N*XAMT**A112A*- - 12.0 - 18.0 24.0 30.0 36.0
N*XCKS**A112A*- 8.4 11.1 15.0 - - - -
N*XDKS**A112A*- 8.1 11.5 14.1 17.2 - - -
N*XFKS**A112A*- 9.0 12.0 15.0 17.0 - - -
N*XUKS**A112B*- 9.0 12.0 - 17.2 - - -
N*XUKS**A112A*6.0 - - - - - - -
N*XWPH**A112A*6.0 9.0 12.0 15.0 17.2 - - -
N*XWPH**B112A*6.0 9.0 12.0 15.0 17.2 - - -
N*XWST**A112A*6.0 9.0 12.0 14.0 17.2 22.5 - -
N*XWST**B112A*6.0 9.0 12.0 14.0 18.0 22.4 - -
*PEADA0**1AA80*- 9.0 12.0 15.0 18.0 24.0 30.0 36.0
*PLA0A0**1EA70*- - 12.0 - 18.0 24.0 30.0 36.0
<Cooling>
Design Condition
Outdoor Design Dry Bulb Temperature 98.6ºF (37.0ºC)
Total Cooling Load 30.3 kBtu/h
Room1
Indoor Design Dry Bulb Temperature 80.6ºF (27.0ºC)
Indoor Design Wet Bulb Temperature 68.0ºF (20.0ºC)
Cooling Load 13.6 kBtu/h
Room2
Indoor Design Dry Bulb Temperature 75.2ºF (24.0ºC)
Indoor Design Wet Bulb Temperature 66.2ºF (19.0ºC)
Cooling Load 16.7 kBtu/h
<Other>
Indoor/Outdoor Equivalent Piping Length 250 ft
0 50 100 150 200 250 300 350 400 450 500 550 600
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
1. Cooling Calculation
(1) Temporary Selection of Indoor Units
Room1
TPEFYP015 15.0 kBtu/h (Rated)
Room2
TPEFYP018 18.0 kBtu/h (Rated)
(2) Total Indoor Units Capacity
P15+ P18 = P33
(3) Selection of Outdoor Unit
The capacity class 36 is selected as total indoor units capacity is 33.
NTXMSM36A142BA 36.0 kBtu/h
(4) Total Indoor Units Capacity Correction Calculation
Room1
Indoor Design Wet Bulb Temperature Correction (68.0ºF)
1.02 (Refer to Figure 1)
Figure 1 Indoor unit temperature correction
To be used to correct indoor unit only
Figure 2 Outdoor unit temperature correction
To be used to correct outdoor unit only
Figure 3 Correction of refrigerant piping length
Room2
Indoor Design Wet Bulb Temperature Correction (66.2ºF)
0.95 (Refer to Figure 1)
CTi = Σ (Indoor Unit Rating × Indoor Design Temperature Correction)
= 15.0 × 1.02 + 18.0 × 0.95
= 32.4 kBtu/h
(5) Outdoor Unit Correction Calculation
Outdoor Design Dry Bulb Temperature Correction (98.6ºF)
0.98 (Refer to Figure 2)
Piping Length Correction (250 ft) 0.93 (Refer to Figure 3)
Total Outdoor Unit Capacity (CTo)
*1 G(CTi) is used only when greater than 100% indoor model size are connected in total,
refer to STANDARD CAPACITY DIAGRAM.
Total Indoor Units Capacity (CTi)
CTo = Outdoor Rating × G(CTi)*1 × Outdoor Design Temperature Correction
× Piping Length Correction
= 36.0 × 0.98 × 0.93
= 32.8 kBtu/h
(6) Determination of Maximum System Capacity
Comparison of Capacity between Total Indoor Units Capacity (CTi) and Total Outdoor Unit Capacity (CTo)
CTi = 32.4 < CTo = 32.8, thus, select CTi.
CTx = CTi = 32.4 kBtu/h
Indoor
Temperature
-15 -10 -5 0 5 10 15 20 25 30 35 40 45
5 14 23 32 41 50 59 68 77 86 95 104 113
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
Ratio of cooling capacity
Outdoor Temperature
[°C D.B.]
[°F D.B.]
19.4°C (67.0°F) W.B
15 16 17 18 19 20 21 22 23 24
59 60.8 62.6 64.4 66.2 68 69.8 71.6 73.4 75.2
0.4
0.6
0.8
1.0
1.2
Ratio of cooling capacity
Indoor Temperature
[°CW.B.]
[°FW.B.]
18 [kBtu/h]
27 [kBtu/h]
36 [kBtu/h]
Capacity ratio
Piping equivalent length (ft)
Total capacity of indoor unit
46.8 [kBtu/h]

17
OCHT810A
(kBtu/h)
<TP•FY series>
Model Number
for indoor unit
Model
004
Model
005
Model
006
Model
008
Model
012
Model
015
Model
018
Model
024
Model
027
Model
030
Model
036
Model
048
Model
054
Model
Capacity 4.5 5.6 6.7 9.0 13.5 17.0 20.0 27.0 30.0 34.0 40.0 54.0 60.0
Capacity of indoor unit
(7) Comparison with Essential Load
Against the essential load 30.3 kBtu/h, the maximum system capacity is 32.4 kBtu/h: Proper outdoor units have been selected.
(8) Calculation of Maximum Indoor Unit Capacity of Each Room
CTx = CTi, thus, calculate by the calculation below
Room1
Indoor Unit Rating × Indoor Design Temperature Correction
= 15.0 × 1.02
= 15.3 kBtu/h OK: fulfills the load 13.6 kBtu/h
Room2
Indoor Unit Rating × Indoor Design Temperature Correction
= 18.0 × 0.95
= 17.1 kBtu/h OK: fulfills the load 16.7 kBtu/h
Go on to the heating trial calculation since the selected units fulfill the cooling loads of Room 1, 2.
<Heating>
Design Condition
Outdoor Design Wet Bulb Temperature 35.6ºF (2.0ºC)
Total Heating Load 34.0 kBtu/h
Room1
Indoor Design Dry Bulb Temperature 69.8ºF (21.0ºC)
Heating Load 16.3 kBtu/h
Room2
Indoor Design Dry Bulb Temperature 73.4ºF (23.0ºC)
Heating Load 17.7 kBtu/h
<Other>
Indoor/Outdoor Equivalent Piping Length 328 ft
<N*X, T(A)P*A series>
Model name Capacity class
06 09 12 15 18 24 30 36
N*XAMT**A112A*- - 12.0 - 18.0 27.0 34.0 40.0
N*XCKS**A112A*- 10.2 13.7 17.1 - - - -
N*XDKS**A112A*- 10.9 13.6 18.0 17.2 - - -
N*XFKS**A112A*- 10.9 13.0 18.0 21.0 - - -
N*XUKS**A112B*- 10.9 13.0 - 21.0 - - -
N*XUKS**A112A*6.0-------
N*XWPH**A112A*6.0 10.9 13.6 18.0 20.3 - - -
N*XWPH**B112A*6.0 10.9 13.6 18.0 20.3 - - -
N*XWST**A112A*6.0 10.9 14.4 18.0 21.6 27.6 - -
N*XWST**B112A*6.0 10.9 14.4 18.0 21.6 27.6 - -
*PEADA0**1AA80*- 10.9 13.5 15.7 18.0 26.0 34.0 40.0
*PLA0A0**1EA70*- - 13.5 - 18.0 26.0 34.0 40.0

18
OCHT810A
0 50 100 150 200 250 300 350 400 450 500 550 600
0.70
0.75
0.80
0.85
0.90
0.95
1.00
(5) Outdoor Unit Correction Calculation
Outdoor Design Wet Bulb Temperature Correction (35.6ºF)
1.0 (Refer to Figure 5)
Piping Length Correction (328 ft)
Defrost Correction
0.94 (Refer to Figure 6)
0.89 (Refer to Table 1)
Total Outdoor Unit Capacity (CTo)
CTo = Outdoor Unit Rating × G(CTi)*1× Outdoor Design Temperature Correction
× Piping Length Correction × Defrost Correction
= 41.0 × 1.0 × 0.94 × 0.89
= 34.3 kBtu/h
(6) Determination of Maximum System Capacity
Comparison of Capacity between Total Indoor Units Capacity (CTi) and Total Outdoor Unit Capacity (CTo)
CTi = 35.4 > CTo = 34.3, thus, select CTo.
CTx = CTo = 34.3 kBtu/h
(7) Comparison with Essential Load
Against the essential load 34.0 kBtu/h, the maximum system capacity is 34.3 kBtu/h: Proper outdoor units have been selected.
(8) Calculation of Maximum Indoor Unit Capacity of Each Room
CTx = CTo, thus, calculate by the calculation below
Room1
Maximum Capacity × Room1 Capacity after the Temperature Correction/(Room1,2 Total Capacity after the Temperature Correction
= 34.3 × (17.0 × 1.00) / (17.0 × 1.00 + 20.0 × 0.92)
= 16.5 kBtu/h OK: fulfills the load 16.3 kBtu/h
Room2
Maximum Capacity × Room1 Capacity after the Temperature Correction/(Room1,2 Total Capacity after the Temperature Correction
= 34.3 × (20.0 × 0.92) / (17.0 × 1.00 + 20.0 × 0.92)
= 17.8 kBtu/h OK: fulfills the load 17.7 kBtu/h
Completed selecting units since the selected units fulfill the heating loads of Room 1, 2.
Figure 6 Correction of refrigerant piping length
*1 G(CTi) is used only when greater than 100% indoor model size are connected in total,
refer to STANDARD CAPACITY DIAGRAM.
Capacity ratio
Piping equivalent length (ft)
Total capacity of indoor unit
Table 1 Table of correction factor at frost and defrost
Outdoor Intake temperature <W.B.°F (°C)> 43(6) 37(4) 36(2) 32(0) 28(−2) 25(−4) 21(−6) 18(−8) 14(−10) 5(−15) −4(−20) −13(−25)
Correction factor 1.00 0.98 0.89 0.88 0.89 0.90 0.95 0.95 0.95 0.95 0.95 0.95
2. Heating Calculation
(1) Temporary Selection of Indoor Units
Room1
TPEFYP015 17.0 kBtu/h (Rated)
20.0 kBtu/h (Rated)
Room2
TPEFYP018
(2) Total Indoor Units Capacity
P15 + P18 = P33
(3) Selection of Outdoor Unit
The capacity class 36 is selected when the total indoor units capacity is 33.
NTXMSM36A142BA 41.0 kBtu/h
(4) Total Indoor Units Capacity Correction Calculation
Room1
Indoor Design Dry Bulb Temperature Correction (69.8ºF)
1.00 (Refer to Figure 4)
Room2
Indoor Design Dry Bulb Temperature Correction (73.4ºF)
0.92 (Refer to Figure 4)
CTi = Σ (Indoor Unit Rating × Indoor Design Temperature Correction)
= 17.0 × 1.00 + 20.0 × 0.92
= 35.4 kBtu/h
Total Indoor Units Capacity (CTi)
Figure 4 Indoor unit temperature correction
To be used to correct indoor unit only
Figure 5 Outdoor unit temperature correction
To be used to correct outdoor unit only
15 16 17 18 19 20 21 22 23 24 25 26 27
59 60.8 62.6 64.4 66.2 68 69.8 71.6 73.4 75.2 77 78.8 80.6
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
Ratio of heating capacity
Indoor Temperature
[°C D.B.]
[°F D.B.]
Indoor
Temperature
-25 -20 -15 -10 -5 0 5 10 15
-13 -4 5 14 23 32 41 50 59
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
Ratio of heating capacity
Outdoor Temperature
[°C W.B.]
[°F W.B.]
21.1°C (70.0°F) D.B.

19
OCHT810A
n: Total number of the indoor units
k: Number of the indoor unit
c
k
: Outdoor unit power input coefficient of k indoor unit room temp.
M
k
: Number part of the k indoor unit model (e.g. P80 →80)
<Cooling>
3. Power input of outdoor unit
Outdoor unit: NTXMSM36A142BA
Indoor unit 1: TPEFY015
Indoor unit 2: TPEFY018
(1) Rated power input of outdoor unit 2.40 kW
1.04 (Refer to “4-2. CORRECTION BY TEMPERATURE”.)
(2) Calculation of the average indoor temperature power input coefficient
Coefficient oftheoutdoor unit for indoor unit 1 (Outdoor temp. 98.6°F [37.0°C] D.B., Indoortemp. 68.0°F [20.0°C] W.B.)
Maximum System Capacity (CTx) = Total Outdoor unit Capacity (CTo), so use the following formula
Total Indoor units capacity
15 + 18 = 33, thus, (CTi) = 0.9 (Refer to the tables in “4-4.STANDARD CAPACITY DIAGRAM”.)
PIo = Outdoor unit Cooling Rated Power Input × Correction Coefficient of Indoor temperature × (CTi)
= 2.40 × 0.94 × 0.9
= 2.03 kW
0.85 (Refer to “4-2. CORRECTION BY TEMPERATURE”.)
Coefficient oftheoutdoor unit for indoor unit 2 (Outdoor temp. 98.6°F [37.0°C] D.B., Indoortemp. 64.4°F [18.0°C] W.B.)
Correction Coefficient of Indoor temperature = 1.04 × 15/(15 + 18) + 0.85 × 18/(15 + 18)
= 0.94
n
k=1
n
k=1
Average indoor temp. power input coefficient ( c
ave
) = ∑ {c
k
× (M
k
/ ∑ M
k
)}
(4) Outdoor power input (PIo)
(3) Coefficient of the partial load (CTi)
n: Total number of the indoor units
k: Number of the indoor unit
c
k
: Outdoor unit power input coefficient of k indoor unit room temp.
M
k
: Number part of the k indoor unit model (e.g. P80 →80)
<Heating>
(1) Rated power input of outdoor unit 3.01 kW
1.16 (Refer to “4-2. CORRECTION BY TEMPERATURE”.)
(2) Calculation of the average indoor temperature power input coefficient
Coefficient of the outdoor unit for indoor unit 1 (Outdoor temp. 26.6°F [−3°C] W.B., Indoortemp. 70°F [21.1°C] D.B.)
Maximum System Capacity (CTx) = Total Indoor unit Capacity (CTi), so use the following formula
PIo = Outdoor unit Heating Rated Power Input × Correction Coefficient of Indoortemperature × (CTi)
= 3.01 × 1.12 × 0.9
= 3.03 kW
1.09 (Refer to “4-2. CORRECTION BY TEMPERATURE”.)
Coefficient of the outdoor unit for indoor unit 2 (Outdoortemp.26.6°F [−3°C] W.B., Indoortemp. 78.8°F [26°C] D.B.)
Correction Coefficient of Indoor temperature = 1.16 × 15/(15 + 18) + 1.09 × 18/(15 + 18)
= 1.12
n
k=1
n
k=1
Average indoor temp. power input coefficient ( c
ave
) = ∑ {c
k
× (M
k
/ ∑ M
k
)}
(4) Outdoor power input (PIo)
(3) Coefficient of the partial load (CTi)
Total indoor units capacity
15 + 18 = 33, thus, (CTi) = 0.9 (Refer to the tables in “4-4. STANDARD CAPACITY DIAGRAM”.)

20
OCHT810A
4-2. CORRECTION BY TEMPERATURE
CITY MULTI could have varied capacity at di󰀨erent designing temperature. Using the nominal cooling/heating capacity value
and the ratio below, the capacity can be observed at various temperature.
Figure 7 Indoor unit temperature correction
To be used to correct indoor unit capacity only
Figure 8 Outdoor unit temperature correction
To be used to correct outdoor unit capacity only
<Cooling>
Indoor Temperature
Indoor Temperature
15 16 17 18 19 20 21 22 23 24
59 60.8 62.6 64.4 66.2 68 69.8 71.6 73.4 75.2
0.4
0.6
0.8
1.0
1.2
Ratio of cooling capacity
Indoor Temperature
[°CW.B.]
[°FW.B.]
5 14 23 32 41 50 59 68 77 86 95 104 113
-15 -10 -5 0 5 10 15 20 25 30 35 40 45
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
Ratio of cooling capacity
Outdoor Temperature
67.0°F (19.4°C) W.B.
[°C D.B.]
[°F D.B.]
5 14 23 32 41 50 59 68 77 86 95 104 113 118
0.0
0.2
0.4
0.6
0.8
1.0
1.2
Ratio of power input
Outdoor Temperature
[°C D.B.]
[°F D.B.]
68.0°F (20.0°C) W.B.68.0°F (20.0°C) W.B. 75.2°F (24.0°C) W.B.75.2°F (24.0°C) W.B. 72.0°F (22.0°C) W.B.72.0°F (22.0°C) W.B.
67.0°F (19.4°C) W.B.67.0°F (19.4°C) W.B.
64.0°F (18.0°C) W.B.64.0°F (18.0°C) W.B.
61.0°F (16.0°C) W.B.61.0°F (16.0°C) W.B.
-15 -10 -5 0 5 10 15 20 25 30 35 40 45 48