Mitsubishi Electric MXZ-4C36NAHZ Operating manual

TECHNICAL & SERVICE MANUAL
CONTENTS
TECHNICAL CHANGES......................................... 2
1. SAFETY PRECAUTION....................................3
2. OVERVIEW OF UNITS......................................6
3. SPECIFICATIONS............................................10
4. DATA................................................................ 14
5. OUTLINES AND DIMENSIONS...................... 36
6. WIRING DIAGRAM......................................... 40
7.
NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION.... 47
8. TROUBLESHOOTING.................................... 52
9.
PRECAUTIONS AGAINST REFRIGERANT LEAKAGE
....141
10. DISASSEMBLY PROCEDURE......................142
No. OCH573
REVISED EDITION-E
MXZ-4C36NAHZ MXZ-4C36NAHZ-U1
MXZ-5C42NAHZ MXZ-5C42NAHZ-U1
MXZ-8C48NAHZ MXZ-8C48NAHZ-U1
MXZ-8C48NA MXZ-8C48NA-U1
MXZ-8C60NA-U1
PAC-MKA50BC
PAC-MKA30BC
PAC-MKA51BC
PAC-MKA31BC
HFC
utilized
R410A
Februray 2018
Notes:
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[Model Name]
<Outdoor unit>
MXZ-4C36NAHZ
MXZ-5C42NAHZ
MXZ-8C48NAHZ
MXZ-8C48NA
MXZ-8C60NA
<Branch box>
PAC-MKA50BC
PAC-MKA30BC
PAC-MKA51BC
PAC-MKA31BC
PARTS CATALOG (OCB573)
[Service Ref.]
OUTDOOR UNIT: MXZ-4C36NAHZ
BRANCH BOX: PAC-MKA51BC
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TECHNICAL CHANGES
MXZ-4C36NAHZ MXZ-4C36NAHZ-U1
MXZ-5C42NAHZ MXZ-5C42NAHZ-U1
MXZ-8C48NAHZ MXZ-8C48NAHZ-U1
MXZ-8C48NA MXZ-8C48NA-U1
Service ref. have been changed as follows.
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OCH573E

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Cautions for units utilizing refrigerant R410A
1-1. ALWAYS OBSERVE FOR SAFETY
Use new refrigerant pipes.
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency 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.
Use a vacuum pump with a reverse flow check
valve.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil, etc.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigera-
nt will change and the efficiency will be lowered.
Flare tool
Electronic refrigerant
charging scale
Vacuum pump adaptor
Size adjustment gauge
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools for R410A
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil, etc.
If large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil, etc.
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 specified thickness.
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the
unit is being used, serviced, or disposed of.
Correct refrigerant is specified 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.
Use the specified refrigerant only.
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.
1-2. CAUTIONS RELATED TO NEW REFRIGERANT
Before obtaining access to terminal, all supply
circuit must be disconnected.
1 SAFETY PRECAUTION
OCH573E

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Unit
Electronic weighing scale
[3] Service tools
(1) Use the below service tools as exclusive tools for R410A refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
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[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.
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OCH573E

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1-3. Cautions for refrigerant piping work
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37RROVIRU5$7KHIROORZLQJWDEOHVKRZVZKHWKHUFRQYHQWLRQDOWRROVFDQEHXVHGRUQRW
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
1/32 [0.8]
1/32 [0.8]
1/32 [0.8]
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 R22
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
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
6.35
9.52
12.70
15.88
19.05
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.
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OCH573E


2 OVERVIEW OF UNITS
2-1. CONSTRUCTION OF SYSTEM
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OCH573E

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Indoor unit (Ceiling concealed type)
Indoor unit
(Wall mounted type)
Outdoor unit Branch box
2-2. SYSTEM OUTLINE
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2-2-1. System example
2-2-2. Method for identifying
Ŷ2XWGRRUXQLW
Development No. : A, B, ···,etc.
Power supply
N: Single phase 208/230 V 60Hz
Multi type heat pump
inverter outdoor unit
Indicates equivalent to rated cooling capacity.
(kBTU/h)
Number of connectable indoor units (MAX.)
Control and refrigerant
A : New A control and R410A
Model type
M X Z-4 88C NA
P A C-MK A5 1 B C
HZ-U1
Sub-number
(Indispensable)
Optional parts
Model type
Branch box (Controller)
Number of branches
5 : 5 branches
3 : 3 branches
Marketable area
A: America, Canada
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OCH573E

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2-3. TYPICAL COMBINATION EXAMPLE
Branch box is located INSIDE of condominium
Branch box
(Inside)
Installing branch box indoors
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Branch box (5-branches type)
Outdoor unit
SEZ-18 MSZ-12 MSZ-12 MSZ-09 MSZ-09
Living Dining Bedroom (1) Bedroom (2)
Master
bedroom
Indoor unit type (capacity class)
Rated capacity (cooling) (kBTU/h)
06
6
09
9
12
12
15
15
24
24
18
18
30
30
36
36
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Example:
Total rated capacity
60 62.4 kBTU/h
MSZ-09 = 9
+
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SEZ-18 = 18
MSZ-12 = 12
MSZ-12 = 12
MSZ-09 = 9
OCH573E

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2-4. SIMPLIFIED PIPING SYSTEM
Piping connection size
Liquid
Gas
{3/8 inch
[9.52 mm]
{5/8 inch
[15.88 mm]
The piping connection size differs according to the type and capacity of indoor units.
Match the piping connection size of branch box with indoor unit.
If the piping connection size of branch box does not match the piping connection size of
indoor unit, use optional different-diameter (deformed) joints to the branch box side.
(Connect deformed joint directly to the branch box side.)
AB
{3/4 inch*
[19.05 mm]
* MXZ-8C60NA only
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A
BB B BB
Branch box
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2 branches pipe (joint)
: optional parts
Branch box #1
Branch box #2
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3 SPECIFICATIONS
3-1. OUTDOOR UNIT :
MXZ-4C36/5C42/8C48NAHZ(-U1), MXZ-8C48NA(-U1), MXZ-8C60NA-U1
Conversion formula:
kcal/h = kW o860
BTU/h = kW o3412
CFM = m3/min o35.31
Service Ref. MXZ-4C36NAHZ(-U1) MXZ-5C42NAHZ(-U1)
Standard performance
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Conversion formula:
kcal/h = kW o860
BTU/h = kW o3412
CFM = m3/min o35.31
OCH573E


kW
A
inch (mm)
inch (mm)
inch (mm)
lb (kg)
inch (mm)
inch (mm)
inch (mm)
inch (mm)
Connectable number of indoor units
Power supply
Input
Running current
External finish
Dimensions
Weight
Piping
connection
(Flare)
Width
Depth
Height
Branch (indoor side)
Main (outdoor side)
Liquid
Gas
Liquid
Gas
Maximum 3
15 (6.7 )
[1/4 (6.35) × 3 {A,B,C}
[3/8 (9.52) × 3 {A,B,C}
Maximum 5
16 (7.4)
[1/4 (6.35) × 5 {A,B,C,D,E}
[3/8 (9.52) × 4 {A,B,C,D},
[1/2 (12.7) × 1{E}
PAC-MKA50BC
PAC-MKA51BC
PAC-MKA30BC
PAC-MKA31BC
Single phase, 208/230 V, 60 Hz
0.003
0.05
Galvanized sheets
17-23/32 (450)
11-1/32 (280)
6-11/16 (170)
[3/8 (9.52)
[5/8 (15.88)
*
Model name
3-2. BRANCH BOX: PAC-MKA50BC PAC-MKA51BC PAC-MKA30BC PAC-MKA31BC
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OCH573E


4
4-1. SELECTION OF COOLING/HEATING UNITS
DATA
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
 ,QGLYLGXDO5DWHG,QGRRU8QLW&DSDFLW\&7
ik
×
k=1
,QGLYLGXDO,QGRRU Temperature Correction Coef. Įk ) (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
&7
i
L&7
o
Maximum Capacity(CT
max
) = CT
i
L&7
i
Need to select smaller
outdoor unit?
Does it fulfill the load of
each room?
Outdoor Unit Input = Rated Outdoor Unit Input ×
c
DYH
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
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c
DYH)AYHUDJH,QGRRUWHPSSRZHULQSXW&RHI
c
DYH)
c
DYH ^F k
× (M
k
0
k
)}
n
k=1
n
k=1
c
DYH ^F k
× (M
k
0
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
: 1XPEHUSDUWRIWKHNLQGRRUXQLWPRGHOHJ3ĺ
&7
im
× Įm )
n
m=1
,QGLYLGXDO,QGRRU8QLW&DSDFLW\&7
ik
= CT
max
×
CT
ik
× Įk
Outdoor Unit Input = Rated Outdoor Unit Input ×
c
DYH
× (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
OCH573E


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
 ,QGLYLGXDO5DWHG,QGRRU8QLW&DSDFLW\&7
ik
×
k=1
,QGLYLGXDO,QGRRU Temperature Correction Coef. Įk ) (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
&7
i
L&7
o
Maximum Capacity(CT
max
) = CT
i
L&7
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
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c
DYH)
^F
k
× (M
k
0
k
)}
n
k=1
n
k=1
7KHSXUSRVHRIWKLVIORZFKDUWLVWRVHOHFWWKHLQGRRUDQGRXWGRRUXQLWV)RURWKHUSXUSRVHVWKLVIORZFKDUWLVLQWHQGHGRQO\for reference.
*c
k
: 2XWGRRUXQLWSRZHULQSXWFRHfficient of k indoor unit room temp. (Refer to 4-2.)
*M
k
: 1XPEHUSDUWRIWKHNLQGRRUXQLWPRGHOHJ3ĺ
AYHUDJH,QGRRUWHPSSRZHULQSXW&RHI c
DYH)
c
DYH ^F k
× (M
k
0
k
)}
n
k=1
n
k=1
Outdoor Unit Input =Rated Outdoor Unit Input × c
DYH Outdoor Unit Input = Rated Outdoor Unit Input ×
c
DYH
× (CTi )
&7
im
× Įm )
n
m=1
,QGLYLGXDO,QGRRU8QLW&DSDFLW\&7
ik
= CT
max
×
CT
ik
× Įk
Completed Selecting Units
Completed Selecting Units
[LVWKHDSSUR[LPDWHFRUUHFWLRQIXQFWLRQZKHQJUHDWHU
than 100% model size units are connected.
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)
[LVWKHDSSUR[LPDWHFRUUHFWLRQIXQFWLRQZKHQJUHDWHUWKDQ
model size units are input as connected.
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100% model size units are input as connected.
CT
i
× (CTi )
Input
Calculation
OCH573E


<Cooling>
Design Condition
Outdoor Design Dry Bulb Temperature 98.6ºF (37.0ºC)
Total Cooling Load 29.6 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 16.0 kBTU/h
<Other>
Indoor/Outdoor Equivalent Piping Length 250 ft
1. Cooling Calculation
(1) Temporary Selection of Indoor Units
Room1
MSZ-FH15
15.0 kBTU/h (Rated)
Room2
MSZ-FH18
17.2 kBTU/h (Rated)
(2) Total Indoor Units Capacity
15 + 18 = 33
(3) Selection of Outdoor Unit
The P36 outdoor unit is selected as total indoor units capacity is P33
MXZ-4C36
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)
CTL Ȉ,QGRRU8QLW5DWLQJî,QGRRU'HVLJQ7HPSHUDWXUH&RUUHFWLRQ
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N%78K
(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)
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7RWDO,QGRRU8QLWV&DSDFLW\&7L
CTo = 2XWGRRU5DWLQJî2XWGRRU'HVLJQ7HPSHUDWXUH&RUUHFWLRQî3LSLQJ/HQJWK&RUUHFWLRQ
îî
N%78K
(6) Determination of Maximum System Capacity
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CTi = 31.6 < CTo = 32.8, thus, select CTi.
CTx = CTi N%78K
(7) Comparison with Essential Load
Against the essential load 29.6 kBTU/h, the maximum system capacity is 31.6 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 8nit Rating îIndoor Design Temperature Correction
î
N%78K OK: fulfills the load 13.6 kBTU/h
Room2
Indoor 8nit Rating îIndoor Design Temperature Correction
î
N%78K OK: fulfills the load 16.0 kBTU/h
Go on to the heatin
g
trial calculation since the selected units fulfill the coolin
g
loads of Room 1
,
2.
Indoor
Temperature
Ratio of cooling capacity
Indoor Temperature
[°F W.B.]
[°C W.B.]
-15 -10 -5 0 5 10 15 20 25 30 35 40 45
514
23 32 41 50 59 68  86 95 104 113
0.5
0.6

0.8
0.9
1.0
1.1
1.2
1.3
1.4
Ratio of cooling capacity
Outdoor Temperature
[°C D.B.]
[°F W.B.]
)(19.4°C) W.B
15 16  18 19 20 21 22 23 24
59 60.8 62.6 64.4 66.2 68 69.8   
0.4
0.6
0.8
1.0
1.2
0 20 40 60 80 100 120 140 160 180 200 220 240 260


0.80
0.85
0.90
0.95
1.00
>N%78K@
>N%78K@
>N%78K@
Capacity ratio
Piping equivalent length (ft)
Total capacity of indoor unit
>N%78K@
Capacity of indoor unit
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OCH573E

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<Heating>
Design Condition
Outdoor Design Wet Bulb Temperature 35.6ºF (2.0ºC)
Total Heating Load 34.4 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 18.1 kBTU/h
<Other> Indoor/Outdoor Equivalent Piping Length 230 ft
2. Heating Calculation
(1) Temporary Selection of Indoor Units
Room1
MSZ-FH15 18.0 kBUT/h (Rated)
20.3 kBUT/h (Rated)
Room2
MSZ-FH18
(2) Total Indoor Units Capacity
15 + 18 = 33
(3) Selection of Outdoor Unit
The P36 outdoor unit is selected as total indoor units capacity is P33
MXZ-4C36 45.0 kBUT/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)
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(5) Outdoor Unit Correction Calculation
Outdoor Design Wet Bulb Temperature Correction (35.6ºF)
1.0 (Refer to Figure 5)
Piping Length Correction (230 ft)
Defrost Correction
0.96 (Refer to Figure 6)
0.89 (Refer to Table 1)
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CTo = Outdoor 8nit Rating îOutdoor Design Temperature Correction îPiping Length
Correction îDefrost Correction
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(6) Determination of Maximum System Capacity
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CTi = 36.7 < CTo = 38.4, thus, select CTi.
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(7) Comparison with Essential Load
Against the essential load 34.4 kBTU/h, the maximum system capacity is 36.7 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
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N%78K OK: fulfills the load 16.3 kBTU/h
Room2
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= îîî+î
= N%78K OK: fulfills the load 18.1 kBTU/h
Completed selecting units since the selected units fulfill the heating loads of Room 1, 2.
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
Figure 6 Correction of refrigerant piping length
-4 5 142332415059
-25 -20 -15 -10 -5 0 5 10 15
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0.5
0.6
0.7
0.8
0.9
0.8
0.5
0.6
0.7
1.0
1.1
1.2
1.0
1.1
1.3
1.4
Ratio of heating capacity
Outdoor Temperature [°C W.B.]
70.0°F (21.1°C) D.B
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 W.B.]
[°C D.B.]
[°F W.B.]
Indoor
Temperature
0 20 40 60 80 100 120 140 160 180 200 220 240 260
0.70
0.75
0.80
0.85
0.90
0.95
1.00
Total capacity of indoor unit
Capacity ratio
Piping equivalent length (ft)
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OCH573E

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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 ĺ80)
<Cooling>
3. Power input of outdoor unit
Outdoor unit : MXZ-4C36
Indoor unit 1 : MSZ-FH15
Indoor unit 2 : MSZ-FH18
(1) Rated power input of outdoor unit 2.57 kW
1.04 (Refer to “4-2. CORRECTING BY TEMPERATURE”.)
(2) Calculation of the average indoor temperature power input coefficient
Coefficient of the outdoor unit for indoor unit 1 (Outdoor temp. 98.6°F [37.0°C] D.B., Indoor temp. 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)
= 2.57 × 0.94 × 0.9
= 2.2 kW
0.85 (Refer to “4-2. CORRECTING BY TEMPERATURE”.)
Coefficient of the outdoor unit for indoor unit 2 (Outdoor temp. 98.6°F [37.0°C] D.B., Indoor temp. 64.4°F [18.0°C] W.B.)
= 1.04 × 15/(15 + 18) + 0.85 × 18/(15 + 18)
= 0.94
n
k=1
n
k=1
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ave
)  ^F
k
× (M
k
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k
)}
(4) Outdoor power input (PIo)
(3) Coefficient of the partial load (CTi)
OCH573E

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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 ĺ80)
<Heating>
(1) Rated power input of outdoor unit 3.34 kW
1.34 (Refer to “4-2. CORRECTING 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 [í3°C] W.B., Indoor temp. 68.0°F [20°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 Indoor temperature × (CTi)
= 3.34 × 1.20 × 0.9
= 3.61 kW
1.09 (Refer to “4-2. CORRECTING BY TEMPERATURE”.)
Coefficient of the outdoor unit for indoor unit 2 (Outdoor temp. 26.6°F [í3°C] W.B., Indoor temp. 77.0°F [25°C] D.B.)
= 1.34 × 15/(15 + 18) + 1.09 × 18/(15 + 18)
= 1.20
n
k=1
n
k=1
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ave
)  ^F
k
× (M
k
0
k
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(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 TEMPERATURE”.)
OCH573E

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4-2. CORRECTION BY 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.]
514
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 W.B.]
[°F W.B.]
-15 -10 -5 0 5 10 15 20 25 30 35 40 45
514
23 32 41 50 59 68 77 86 95 104 113
0.0
0.2
0.4
0.6
0.8
1.0
1.2
Ratio of power input
Outdoor Temperature
[°C W.B.]
[°F W.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. 71.6°F (22.0°C) W.B.71.6°F (22.0°C) W.B.
67.0°F (19.4°C) W.B.67.0°F (19.4°C) W.B. 64.4°F (18.0°C) W.B.64.4°F (18.0°C) W.B.
60.8°F (16.0°C) W.B.60.8°F (16.0°C) W.B.
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OCH573E