3. CENTER OF GRAVITY ................................................................................................................................... 19
6-1. Correction by temperature....................................................................................................................... 25
6-2. Correction by total indoor......................................................................................................................... 35
6-3. Correction by refrigerant piping length..................................................................................................... 39
6-4. Correction at frost and defrost ................................................................................................................. 42
6-5. Operation temperature range .................................................................................................................. 43
8. UNIT SELECTION........................................................................................................................................... 45
8-1. Indoor and outdoor unit selection ............................................................................................................ 45
Approximate minimum
audible limit on
continuous noise
Standard
Low
50/60Hz
50/60Hz
Sound level of PUHY-RP200YJM-A (-BS)
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
Approximate minimum
audible limit on
continuous noise
Standard
Low
50/60Hz
50/60Hz
Sound level of PUHY-RP250YJM-A (-BS)
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
5. SOUND LEVELS
Sound level of PUHY-RP300YJM-A (-BS)
90
80
Standard
Low
50/60Hz
50/60Hz
70
60
50
40
Octave band sound level (dB)
30
Approximate minimum
20
audible limit on
continuous noise
10
631252505001k2k4k8k
Octave band central frequency (Hz)
Standard
Low noise mode
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
Approximate minimum
audible limit on
continuous noise
Standard
Low
50/60Hz
50/60Hz
Sound level of PUHY-RP500YSJM-A (-BS)
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
Approximate minimum
audible limit on
continuous noise
Standard
Low
50/60Hz
50/60Hz
Sound level of PUHY-RP400YSJM-A (-BS)
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
Approximate minimum
audible limit on
continuous noise
Standard
Low
50/60Hz
50/60Hz
Sound level of PUHY-RP550YSJM-A (-BS)
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
Approximate minimum
audible limit on
continuous noise
Standard
Low
50/60Hz
50/60Hz
Sound level of PUHY-RP450YSJM-A (-BS)
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
Approximate minimum
audible limit on
continuous noise
Standard
Low
50/60Hz
50/60Hz
Sound level of PUHY-RP600YSJM-A (-BS)
OUTDOOR UNITS 22
5. SOUND LEVELS
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
Approximate minimum
audible limit on
continuous noise
Standard
Low
50/60Hz
50/60Hz
Sound level of PUHY-RP800YSJM-A (-BS)
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
Approximate minimum
audible limit on
continuous noise
Standard
Low
50/60Hz
50/60Hz
Sound level of PUHY-RP700YSJM-A (-BS)
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
Approximate minimum
audible limit on
continuous noise
Standard
Low
50/60Hz
50/60Hz
Sound level of PUHY-RP850YSJM-A (-BS)
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
10
20
30
40
50
60
70
80
90
631252505001k2k4k8k
NC-40
NC-30
NC-20
NC-60
NC-50
NC-70
Octave band central frequency (Hz)
Octave band sound level (dB)
Approximate minimum
audible limit on
continuous noise
Standard
Low
50/60Hz
50/60Hz
Sound level of PUHY-RP900YSJM-A (-BS)
OUTDOOR UNITS 24
6. CAPACITY TABLES
6. CAPACITY TABLES
6-1. Correction by temperature
CITY MULTI could have various capacities at different designing temperatures. Using the nominal cooling/heating capacity values
and the ratios below, the capacity can be found for various temperatures.
PUHY-
Nominal
Cooling
Capacity
Input
RP200YJM-A RP250YJM-A
kW
BTU/h
kW
22.4
76,400
5.68
28.0
95,500
8.28
1.3
1.2
1.1
1.0
0.9
0.8
Ratio of cooling capacity
0.7
0.6
1.2
1.1
1.0
0.9
0.8
Ratio of power input
0.7
0.6
Indoor Temperature
PUHY-
Nominal
Heating
Capacity
Input
RP200YJM-A RP250YJM-A
kW
BTU/h
kW
25.0
85,300
5.69
31.5
107,500
7.83
0.5
-5051015202530354045
233241505968778695104113
1.4
1.3
1.2
1.1
1.0
0.9
0.8
Ratio of heating capacity
0.7
0.6
1.1
1.0
0.9
Ratio of cooling capacity and power inputOutdoor temperature
Indoor Temperature
0.8
Ratio of power input
0.7
0.6
0.5
-20
-4
-15
5
OUTDOOR UNITS
-10
14
Ratio of heating capacity and power inputOutdoor temperature
-5
23
0
32
5
41
10
50
15
59
25
6. CAPACITY TABLES
Ratio of cooling capacity and power inputOutdoor temperature
Ratio of heating capacity and power inputOutdoor temperature
-5051015202530354045
233241505968778695104113
1.1
1.2
1.0
0.9
0.8
0.7
0.6
0.5
Ratio of power input
-20
-4
-15
5
-10
14
-5
23
0
32
5
41
10
50
15
59
0.6
0.8
0.9
1.0
0.7
0.6
0.5
0.4
Ratio of power input
1.4
1.3
1.1
1.0
0.9
0.8
0.7
1.2
Ratio of cooling capacity
Indoor Temperature
1.3
1.2
1.0
0.9
0.8
0.7
1.1
Ratio of heating capacity
Indoor Temperature
Nominal
Cooling
Capacity
Input
kW
BTU/h
kW
Nominal
Heating
Capacity
Input
kW
BTU/h
kW
Nominal
Cooling
Capacity
Input
kW
BTU/h
kW
Nominal
Heating
Capacity
Input
kW
BTU/h
kW
PUHY-
RP300YJM-A RP350YJM-A
PUHY-
RP300YJM-A RP350YJM-A
PUHY-
RP400YSJM-A
PUHY-
RP400YSJM-A
33.5
114,300
9.37
40.0
136,500
12.28
37.5
128,000
9.86
45.0
153,500
13.12
45.0
153,500
11.87
50
170,600
11.38
OUTDOOR UNITS 26
6. CAPACITY TABLES
PUHY-
Nominal
Cooling
Capacity
Input
PUHY-
Nominal
Cooling
Capacity
Input
PUHY-
Nominal
Cooling
Capacity
Input
RP450YSJM-A
kW
BTU/h
kW
50.0
170,600
14.40
RP550YSJM-A P600YSJM-A
kW
BTU/h
kW
63.0
215,000
18.58
RP650YSJM-A
kW
BTU/h
kW
73.0
249,100
22.0
RP500YSJM-A
56.0
191,100
16.96
69.0
235,400
19.94
1.4
1.3
1.2
1.1
1.0
0.9
Ratio of cooling capacity
0.8
0.7
1.2
1.1
1.0
0.9
0.8
Ratio of power input
0.7
0.6
Indoor Temperature
PUHY-
Nominal
Heating
Capacity
Input
PUHY-
Nominal
Heating
Capacity
Input
PUHY-
Nominal
Heating
Capacity
Input
RP450YSJM-A
kW
BTU/h
kW
191,100
RP500YSJM-A
56.0
13.42
RP550YSJM-A RP600YSJM-A
kW
BTU/h
kW
69.0
235,400
17.69
RP650YSJM-A
kW
BTU/h
kW
81.5
278,100
22.70
63.0
215,000
15.67
76.5
261,000
20.13
0.5
-5051015202530354045
233241505968778695104113
1.3
1.2
1.1
1.0
0.9
0.8
Ratio of heating capacity
0.7
0.6
1.1
1.0
0.9
Ratio of cooling capacity and power inputOutdoor temperature
Indoor Temperature
0.8
Ratio of power input
0.7
0.6
0.5
-20
-4
-15
5
OUTDOOR UNITS
-10
14
Ratio of heating capacity and power inputOutdoor temperature
-5
23
0
32
5
41
10
50
15
59
27
6. CAPACITY TABLES
Ratio of cooling capacity and power inputOutdoor temperature
Ratio of heating capacity and power inputOutdoor temperature
-5051015202530354045
233241505968778695104113
1.1
1.2
1.0
0.9
0.8
0.7
0.6
0.5
Ratio of power input
-20
-4
-15
5
-10
14
-5
23
0
32
5
41
10
50
15
59
0.6
0.9
1.0
1.1
0.8
0.7
0.6
0.5
Ratio of power input
1.4
1.3
1.1
1.0
0.9
0.8
0.7
1.2
Ratio of cooling capacity
Indoor Temperature
1.3
1.2
1.0
0.9
0.8
0.7
1.1
Ratio of heating capacity
Indoor Temperature
Nominal
Cooling
Capacity
Input
kW
BTU/h
kW
Nominal
Heating
Capacity
Input
kW
BTU/h
kW
Nominal
Cooling
Capacity
Input
kW
BTU/h
kW
Nominal
Heating
Capacity
Input
kW
BTU/h
kW
PUHY-
RP700YSJM-A RP750YSJM-A
PUHY-
PUHY-
RP800YSJM-A
PUHY-
80.0
273,000
23.59
85.0
290,000
25.07
88.0
300,300
21.35
95.0
324,100
23.63
90.0
307,100
27.19
100.0
341,200
25.44
RP700YSJM-A PR750YSJM-A
RP800YSJM-A
OUTDOOR UNITS 28
6. CAPACITY TABLES
PUHY-
Nominal
Cooling
Capacity
Input
RP850YSJM-A RP900YSJM-A
kW
BTU/h
kW
96.0
327,600
28.57
101.0
344,600
29.61
1.3
1.2
1.1
1.0
0.9
Ratio of cooling capacity
0.8
0.7
1.1
1.0
0.9
0.8
0.7
Ratio of power input
0.6
0.5
Indoor Temperature
PUHY-
Nominal
Heating
Capacity
Input
RP850YSJM-A RP900YSJM-A
kW
BTU/h
kW
108.0
368,500
27.97
113.0
385,600
29.73
0.4
-5051015202530354045
233241505968778695104113
1.2
1.1
1.0
0.9
0.8
Ratio of heating capacity
0.7
0.6
1.1
1.0
0.9
Ratio of cooling capacity and power inputOutdoor temperature
Indoor Temperature
0.8
Ratio of power input
0.7
0.6
0.5
-20
-4
-15
5
OUTDOOR UNITS
-10
14
Ratio of heating capacity and power inputOutdoor temperature
-5
23
0
32
5
41
10
50
15
59
29
6. CAPACITY TABLES
Ratio of cooling capacity and power inputOutdoor temperature
Ratio of heating capacity and power inputOutdoor temperature
-5051015202530354045
233241505968778695104113
1.1
1.2
1.0
0.9
0.8
0.7
0.6
0.5
Ratio of power input
-20
-4
-15
5
-10
14
-5
23
0
32
5
41
10
50
15
59
0.6
1.0
1.2
1.4
1.6
0.8
0.6
0.4
0.2
Ratio of power input
1.3
1.2
1.0
0.9
0.8
0.7
0.6
1.1
Ratio of cooling capacity
Indoor Temperature
1.3
1.4
1.2
1.0
0.9
0.8
0.7
1.1
Ratio of heating capacity
Indoor Temperature
Nominal
Cooling
Capacity
Input
kW
BTU/h
kW
Nominal
Heating
Capacity
Input
kW
BTU/h
kW
RP200YJM-A RP250YJM-A
22.4
76,400
5.68
28.0
95,500
8.28
25.0
85,300
5.69
31.5
107,500
7.83
RP200YJM-A RP250YJM-A
Correction by temperature (High Heating Performance Mode)
CITY MULTI could have various capacities at different designing temperatures. Using the nominal cooling/heating capacity values and the ratios below, the capacity can be found for various temperatures.
To select high heating performance mode, DipSW 3-7 must be set to ON. (In the low ambient temperature, heating capacity
and power input become higher than those under standard mode.)
OUTDOOR UNITS 30
6. CAPACITY TABLES
PUHY-
Nominal
Cooling
Capacity
Input
PUHY-
Nominal
Cooling
Capacity
Input
RP300YJM-A RP350YJM-A
kW
BTU/h
kW
33.5
114,300
9.37
RP400YSJM-A
kW
BTU/h
kW
45.0
153,500
11.87
40.0
136,500
12.28
1.4
1.3
1.2
1.1
1.0
0.9
Ratio of cooling capacity
0.8
0.7
1.2
1.1
1.0
0.9
0.8
Ratio of power input
0.7
0.6
Indoor Temperature
PUHY-
Nominal
Heating
Capacity
Input
PUHY-
Nominal
Heating
Capacity
Input
RP300YJM-A RP350YJM-A
kW
BTU/h
kW
37.5
128,000
9.86
RP400YSJM-A
kW
BTU/h
kW
50
170,600
11.38
45.0
153,500
13.12
0.5
-5051015202530354045
233241505968778695104113
1.4
1.2
1.0
0.8
0.6
0.4
Ratio of heating capacity
0.2
0.0
1.4
1.2
1.0
Ratio of cooling capacity and power inputOutdoor temperature
Indoor Temperature
0.8
Ratio of power input
0.6
0.4
0.2
-20
-4
-15
5
OUTDOOR UNITS
-10
14
Ratio of heating capacity and power inputOutdoor temperature
-5
23
0
32
5
41
10
50
15
59
31
6. CAPACITY TABLES
Ratio of cooling capacity and power inputOutdoor temperature
Ratio of heating capacity and power inputOutdoor temperature
-5051015202530354045
233241505968778695104113
1.1
1.2
1.0
0.9
0.8
0.7
0.6
0.5
Ratio of power input
-20
-4
-15
5
-10
14
-5
23
0
32
5
41
10
50
15
59
0.6
0.5
1.2
1.4
1.6
1.0
0.8
0.6
0.4
Ratio of power input
1.4
1.3
1.1
1.0
0.9
0.8
0.7
1.2
Ratio of cooling capacity
Indoor Temperature
1.3
1.2
1.0
0.9
0.8
0.7
1.1
Ratio of heating capacity
Indoor Temperature
Nominal
Cooling
Capacity
Input
kW
BTU/h
kW
Nominal
Heating
Capacity
Input
kW
BTU/h
kW
Nominal
Cooling
Capacity
Input
kW
BTU/h
kW
Nominal
Heating
Capacity
Input
kW
BTU/h
kW
Nominal
Cooling
Capacity
Input
kW
BTU/h
kW
Nominal
Heating
Capacity
Input
kW
BTU/h
kW
50.0
170,600
14.40
56.0
191,100
16.96
56.0
191,100
13.42
63.0
215,000
15.67
63.0
215,000
18.58
69.0
235,400
19.94
69.0
235,400
17.69
76.5
261,000
20.13
73.0
249,100
22.0
81.5
278,100
22.70
PUHY-
RP450YSJM-A
RP500YSJM-A
PUHY-
PUHY-
RP550YSJM-A P600YSJM-A
PUHY-
PUHY-
RP650YSJM-A
RP450YSJM-A
RP500YSJM-A
RP550YSJM-A RP600YSJM-A
RP650YSJM-A
PUHY-
OUTDOOR UNITS 32
6. CAPACITY TABLES
Nominal
Cooling
Capacity
Input
Nominal
Cooling
Capacity
Input
RP700YSJM-A PR750YSJM-A
kW
BTU/h
kW
80.0
273,000
23.59
RP800YSJM-A
kW
BTU/h
kW
90.0
307,100
27.19
85.0
290,000
25.07
1.4
1.3
1.2
1.1
1.0
0.9
Ratio of cooling capacity
0.8
0.7
1.2
1.1
1.0
0.9
0.8
Ratio of power input
0.7
0.6
Indoor Temperature
Nominal
Heating
Capacity
Input
Nominal
Heating
Capacity
Input
RP700YSJM-A PR750YSJM-A
kW
BTU/h
kW
88.0
300,300
21.35
RP800YSJM-A
kW
BTU/h
kW
100.0
341,200
25.44
95.0
324,100
23.63
0.5
-5051015202530354045
233241505968778695104113
1.4
1.2
1.0
0.8
0.6
0.4
Ratio of heating capacity
0.2
0.0
1.4
1.2
1.0
Ratio of cooling capacity and power inputOutdoor temperature
Indoor Temperature
0.8
Ratio of power input
0.6
0.4
0.2
-20
-4
-15
5
OUTDOOR UNITS
-10
14
Ratio of heating capacity and power inputOutdoor temperature
-5
23
0
32
5
41
10
50
15
59
33
6. CAPACITY TABLES
Ratio of cooling capacity and power inputOutdoor temperature
Ratio of heating capacity and power inputOutdoor temperature
-5051015202530354045
233241505968778695104113
1.0
1.1
0.9
0.8
0.7
0.6
0.5
0.4
Ratio of power input
-20
-4
-15
5
-10
14
-5
23
0
32
5
41
10
50
15
59
0.2
1.0
1.2
1.4
0.8
0.6
0.4
0.2
Ratio of power input
1.3
1.1
1.0
0.9
0.7
0.8
1.2
Ratio of cooling capacity
Indoor Temperature
1.4
1.0
0.8
0.6
0.4
1.2
Ratio of heating capacity
Indoor Temperature
Nominal
Cooling
Capacity
Input
kW
BTU/h
kW
Nominal
Heating
Capacity
Input
kW
BTU/h
kW
96.0
327,600
28.57
101.0
344,600
29.61
108.0
368,500
27.97
113.0
385,600
29.73
PUHY-
RP850YSJM-A RP900YSJM-A
PUHY-
RP850YSJM-A RP900YSJM-A
OUTDOOR UNITS 34
6. CAPACITY TABLES
Capacity(kW)
Input(kW)
Total capacity of indoor units
10.0
10.0
20.0
30.0
40.0
50.0
0.0
5.0
50100200300150250350
100200300400500
Capacity(kW)
Input(kW)
Total capacity of indoor units
10.0
20.0
30.0
40.0
50.0
2.5
5.0
10.0
15.0
7.5
12.5
RP200RP250
PUHY-RP200, 250YJM-A (-BS)
PUHY-RP300, 350YJM-A (-BS)
Cooling
Heating
Cooling
Heating
RP300RP350
Cooling
Heating
Cooling
Heating
6-2. Correction by total indoor
CITY MULTI system have different capacities and inputs when many combinations of indoor units with different total capacities
are connected. Using following tables, the maximum capacity can be found to ensure the system is installed with enough capacity
for a particular application.
OUTDOOR UNITS
35
6. CAPACITY TABLES
Capacity(kW)
Input(kW)
Total capacity of indoor units
20.0
10.0
10.0
15.0
30.0
40.0
50.0
60.0
0.0
5.0
200300400500600700800
Capacity(kW)
Input(kW)
Total capacity of indoor units
30.0
40.0
50.0
60.0
70.0
0.0
5.0
15.0
20.0
10.0
Cooling
Heating
Cooling
Heating
Cooling
Heating
Cooling
Heating
RP500RP550
RP400RP450
PUHY-RP400, 450YSJM-A (-BS)
PUHY-RP500, 550YSJM-A (-BS)
200300400500600
OUTDOOR UNITS 36
6. CAPACITY TABLES
Capacity(kW)
Input(kW)
Total capacity of indoor units
50.0
40.0
30.0
20.0
60.0
70.0
80.0
90.0
0.0
10.0
200300400500600700800900
3004005006007008009001000
Capacity(kW)
Input(kW)
Total capacity of indoor units
40.0
20.0
60.0
80.0
100.0
120.0
0.0
10.0
30.0
20.0
RP600RP650
PUHY-RP600,650YSJM-A (-BS)
PUHY-RP700,750YSJM-A (-BS)
Cooling
Heating
Cooling
Heating
Cooling
Heating
Cooling
Heating
RP700RP750
OUTDOOR UNITS
37
6. CAPACITY TABLES
Capacity(kW)
Input(kW)
Total capacity of indoor units
40.0
20.0
60.0
80.0
100.0
120.0
0.0
10.0
40.0
30.0
400600800100014001200
400500600700800120090010001100
Capacity(kW)
Input(kW)
Total capacity of indoor units
60.0
40.0
80.0
100.0
120.0
140.0
0.0
10.0
30.0
20.0
Cooling
Heating
Cooling
Heating
Cooling
Heating
RP900
RP800RP850
PUHY-RP800, 850YSJM-A (-BS)
PUHY-RP900YSJM-A (-BS)
OUTDOOR UNITS 38
6. CAPACITY TABLES
PUHY-RP400YSJM-A (-BS)
Piping equivalent length (m)
Cooling capacity correction factor
200
300
400
520
0.70
0.75
0.80
0.85
0.90
0.95
1
020406080100120140
PUHY-RP450YSJM-A (-BS)
Piping equivalent length (m)
Cooling capacity correction factor
225
338
450
585
0.75
0.80
0.85
0.90
0.95
1
020406080100120140
PUHY-RP500YSJM-A (-BS)
Piping equivalent length (m)
Cooling capacity correction factor
250
375
500
650
0.70
0.75
0.80
0.85
0.90
0.95
1
020406080100120140
PUHY-RP550YSJM-A (-BS)
Piping equivalent length (m)
Cooling capacity correction factor
275
413
550
715
0.70
0.75
0.80
0.85
0.90
0.95
1
020406080100120140
6-3. Correction by refrigerant piping length
6-3-1. Cooling capacity correction
PUHY-RP200YJM-A (-BS)
1
100
0.95
0.90
0.85
0.80
0.75
Cooling capacity correction factor
0.70
020406080100120140
PUHY-RP250YJM-A (-BS)
Piping equivalent length (m)
1
0.95
0.90
0.85
0.80
0.75
Cooling capacity correction factor
0.70
020406080100120140
Piping equivalent length (m)
150
200
260
125
188
250
325
PUHY-RP300YJM-A (-BS)
1
0.95
0.90
0.85
0.80
0.75
Cooling capacity correction factor
0.70
020406080100120140
PUHY-RP350YJM-A (-BS)
Piping equivalent length (m)
1
0.95
0.90
0.85
0.80
0.75
Cooling capacity correction factor
0.70
020406080100120140
Piping equivalent length (m)
150
225
300
390
175
263
350
455
OUTDOOR UNITS
39
6. CAPACITY TABLES
PUHY-RP600YSJM-A (-BS)
Piping equivalent length (m)
Cooling capacity correction factor
300
450
600
780
0.70
0.75
0.80
0.85
0.90
0.95
1
020406080100120
PUHY-RP800YSJM-A (-BS)
Piping equivalent length (m)
Cooling capacity correction factor
400,
600
800
1040
0.70
0.75
0.80
0.85
0.90
0.95
1
020406080100120
PUHY-RP650YSJM-A (-BS)
Piping equivalent length (m)
Cooling capacity correction factor
325,
488
650
845
0.70
0.75
0.80
0.85
0.90
0.95
1
020406080100120
PUHY-RP850YSJM-A (-BS)
Piping equivalent length (m)
Cooling capacity correction factor
425
637
850
1105
0.70
0.75
0.80
0.85
0.90
0.95
1
020406080100120
PUHY-RP700YSJM-A (-BS)
Piping equivalent length (m)
Cooling capacity correction factor
350,
525
700
910
0.70
0.75
0.80
0.85
0.90
0.95
1
020406080100120
PUHY-RP900YSJM-A (-BS)
Piping equivalent length (m)
Cooling capacity correction factor
450
675
900
1170
0.70
0.75
0.80
0.85
0.90
0.95
1
020406080100120
PUHY-RP750YSJM-A (-BS)
Piping equivalent length (m)
Cooling capacity correction factor
375,
563
750
975
0.70
0.75
0.80
0.85
0.90
0.95
1
020406080100120
OUTDOOR UNITS 40
6. CAPACITY TABLES
PUHY-RP600, 650YSJM-A (-BS)
020406080100120
Heating capacity correction factor
0.95
1.00
Piping equivalent length (m)
0.90
PUHY-RP700, 750, 800YSJM-A (-BS)
020406080100120
Heating capacity correction factor
0.95
1.00
Piping equivalent length (m)
0.90
PUHY-RP850, 900YSJM-A (-BS)
020406080100120
Heating capacity correction factor
0.95
1.00
Piping equivalent length (m)
0.90
6-3-2. Heating capacity correction
PUHY-RP200, 250YJM-A (-BS)
1.00
0.95
Heating capacity correction factor
0.90
020406080100120140
PUHY-RP300, 350YJM-A (-BS)
1.00
0.95
Piping equivalent length (m)
Heating capacity correction factor
0.90
020406080100120140
PUHY-RP400, 450, 500, 550YSJM-A (-BS)
1.00
0.95
Heating capacity correction factor
0.90
020406080100120140
6-3-3. How to obtain the equivalent piping length
1. PUHY-RP200YJM-A (-BS)
Equivalent length = (Actual piping length to the farthest indoor unit ) + (0.35 x number of bent on the piping) [m]
2. PUHY-RP250, 300YJM-A (-BS)
Equivalent length = (Actual piping length to the farthest indoor unit ) + (0.42 x number of bent on the piping) [m]
3. PUHY-RP350YJM-A (-BS)
Equivalent length = (Actual piping length to the farthest indoor unit ) + (0.47 x number of bent on the piping) [m]
Equivalent length = (Actual piping length to the farthest indoor unit ) + (0.50 x number of bent on the piping) [m]
5. PUHY-RP700, 750, 800YSJM-A (-BS)
Equivalent length = (Actual piping length to the farthest indoor unit ) + (0.70 x number of bent on the piping) [m]
6. PUHY-RP850, 900YSJM-A (-BS)
Equivalent length = (Actual piping length to the farthest indoor unit ) + (0.80 x number of bent on the piping) [m]
Piping equivalent length (m)
Piping equivalent length (m)
OUTDOOR UNITS
41
6. CAPACITY TABLES
6-4. Correction at frost and defrost
Due to frost at the outdoor heat exchanger and the automatic defrost operation, the heating capacity of the outdoor unit can be
calculated by multiplying the correction factor shown in the table below.
The angle of the branch pipe is within against the horizontal plane.
2. The length of the straight part of pipe connected in front of the twinning pipe must be 500mm or longer.
Removing, cutting and bending the twinning kit will cause damage the unit.
3. Pipe diameter is indicated by inside diameter.
Note 1. Reference the attitude angle of the branch pipe below the fig.
15
7. OPTIONAL PARTS
7-1. OUTDOOR TWINNING KIT
For PUHY-RP-YSJM, following optional Outdoor Twinning Kit is needed to use to combine to refrigerant flows of its PUHY-RPYJM. Details of selecting the proper kit should be referred to the System Design Section.
OUTDOOR UNITS 44
8. UNIT SELECTION
8. UNIT SELECTION
8-1. Indoor and outdoor unit selection
(1) Selecting indoor units
1) Calculate the thermal road of each room.
2) Based on the thermal load corrected for indoor unit return air temperature, select appropriate indoor unit models.
Refer to the correction factor diagram for the outdoor unit whose capacity is the closest to the total thermal load of the
system (Qi). Refer to “CAPACITY TABLES (Indoor unit)” and “6. CAPACITY TABLES.”
3) Calculate the total capacity of the indoor units in the system (N).
(2) Selecting outdoor units
1) Based on the total capacity of the indoor units (N), tentatively select the capacity of the outdoor unit (X).
The total capacity of the indoor units to be connected to a given outdoor unit (N) should not exceed the maximum
connectable capacity of the outdoor unit.
2) The tentatively selected standard capacity of the outdoor unit (X) will be defined as Qs.
* If the total capacity of the indoor units that are connected to a given outdoor unit exceeds 100% of the outdoor unit
capacity (X), refer to the outdoor unit partial load capacity table, find the capacity that corresponds to the total capacity
N, and use it as the standard outdoor unit capacity (Qs).
3) Obtain the maximum outdoor unit capacity (Qm) by multiplying Qs (standard outdoor unit capacity) by the following
correction factors: piping length, outside air temperature, and defrost (heating).
Find the piping length correction factor from the diagram that corresponds to the total indoor unit capacity (N).
Qm = Qs x Piping length correction factor x Outside air temperature correction factor
x Defrost correction factor (heating only) x Pipe diameter correction factor
Outside air temperature correction factor
Piping length correction factor
Defrost correction factor (heating only)
Pipe diameter correction factor (applicable only if non-standard size pipes are connected)
4) Make sure the maximum outdoor unit capacity Qm is equal to or greater than the total thermal load Qi.
If Qm is smaller than Qi, reconsider the outdoor unit capacity (X) so that Qm ≥ Qi will hold true.
5) After selecting indoor and outdoor units, calculate the apportioned indoor unit capacity, and make sure that the formula
"Thermal load ≤ Indoor unit capacity" will hold true for each room.
If the thermal load exceeds the indoor unit capacity in one or more rooms, increase the indoor unit size as long as doing so
will not exceed the maximum connectable capacity of the outdoor unit. Then, start over from step 1) above. If the
maximum connectable capacity is exceeded by increasing the indoor unit capacity, increase the outdoor capacity as well,
then start over from step 1) above.
Refer to 6-1.
Refer to 6-3.
Refer to 6-4.
Refer to 8-3.
Calculate the indoor/outdoor unit capacities and check for unit compatibility by
considering both the heating and the cooling loads. If the formula Qm ≥ Qi does not
hold true for either cooling or heating, reconsider the outdoor unit capacity (X).
OUTDOOR UNITS
45
8. UNIT SELECTION
(3) Obtaining the unit capacity
(4) Notes
A. If the apportioned indoor unit capacity obtained in step 5) on the previous page is equal to or greater than the rated
indoor unit capacity, the following formula will be used to calculate the indoor unit capacity: "Rated capacity x return air
temperature correction factor x piping length correction factor (x pipe diameter correction factor)".
B. If the apportioned indoor unit capacity obtained in step 5) on the previous page is smaller than the rated indoor unit
capacity, the following formula will be used to calculate the indoor unit capacity: "Apportioned indoor unit capacity x
return air temperature correction factor."
* The standard outside air temperatures used to obtain the return air temperature correction factor is 35ºCDB for cooling
and 6ºCWB for heating.
* If non-standard size pipes are connected, use the pipe diameter correction factors for the main pipes, merge pipes, and
branch pipes.
When deciding the outside air temperature to calculate unit capacity requirements, take into consideration the possible
temperature rise around the outdoor unit due to short-cycling. (When installing outdoor units collectively on the rooftop or if
outdoor units are surrounded by walls or other objects, it is recommended to set the outside temperature as 43ºC for
calculation.)
If you want to take sensible heat load into consideration, refer to the relevant catalogs for information on sensible heat
factor when selecting indoor units.
OUTDOOR UNITS 46
8. UNIT SELECTION
8-2. Calculation samples
(1) To connect indoor units using the standard pipes
Design conditions
<Cooling>
<Heating>
<Miscellaneous information>
A. Calculating the cooling load
a) The thermal load (13.5 kW/room), indoor unit return air temperature correction factor, and piping length correction
factor are used to calculate the required indoor unit capacity, based on which a 125 model of indoor unit is tentatively
selected. (Because the total thermal load is 27 kW, the air temperature correction diagram for the 250 model outdoor
unit will be used.)
b) Because the total capacity of indoor units (N) is 250, the 250 model outdoor unit is tentatively selected.
Based on the above, the standard capacity Qs will be 28 kW.
c) The correction values obtained from the air temperature correction factor graph and the piping length correction factor
graph for the 250 model outdoor units are as follows:
If the standard capacity Qs is corrected for indoor/outside air temperatures and piping length, the maximum outdoor unit
capacity Qm can be obtained as follows: Qm = 28 x 0.99 x 0.97 = 26.8 kW.
The result shows that the thermal load Qi (27 kW) exceeds the unit capacity Qm, so a larger 300 model outdoor unit
needs to be selected.
d) For the 300 model units, the outside air temperature correction factor is 0.99. The piping length correction factor that
can be obtained from the diagram for the system whose total indoor unit capacity is 250 would be 0.96.
Because the standard outdoor unit capacity Qs is 33.5 kW, the maximum outdoor unit capacity Qm can be obtained
using the following formula: Qm = 33.5 x 0.99 x 0.96 = 31.8 kW. The result 31.8 kW is greater than the Qi (27 kW), so
the maximum capacity Qm meets the capacity requirement.
e) Compare the thermal loads on the indoor units, using the maximum outdoor unit capacity apportioned to each indoor
unit and taking the indoor unit return air temperature correction factors into consideration. The correction factor for the
return air temperature at 18.5ºCWB is 0.99 (at the standard outside dry-bulb temperature of 35ºC), and this value can
be plugged into the following formula to obtain the capacity.
32.1 kW x 125/250 x 0.99 = 15.8 kW
The result shows that the capacity (15.8 kW) is greater than the thermal load (13.5 kW), and based on this result, two
125 model indoor units and one 300 model outdoor unit can be selected.
B. Calculating the heating load
Next, you will calculate the heating load and unit capacity requirements, using the models that were selected in the
previous section.
a) The standard capacity (Qs) of the tentatively selected 300 model outdoor unit is 37.5 kW.
b) Use this value in the following formula to obtain the maximum outdoor unit capacity Qm as shown below:
Qm = 37.5 x 1.00 x 0.965 x 0.975 = 35.2 kW, (where the outside air temperature is 5ºCWB, capacity correction factor
is 1.00 (at the standard indoor dry-bulb temperature of 20ºC), defrost correction factor is 0.965, piping length is 50 m,
and capacity correction factor is 0.975).
The result shows that the Maximum outdoor unit capacity Qm (35.2 kW) exceeds the heating load Qi (29 kW).
c) You can now check to see if this value will meet the capacity requirement for each indoor unit by using the following
formula: 35.2 x 125/250 x 0.96 = 16.8 kW (where the indoor unit return air temperature correction factor at 21ºCDB is
0.96) (standard outside temperature at 6ºC). The result shows that the unit capacity (16.8 kW) exceeds the thermal
load for each room (14.5 kW).
Based on the above calculation, the following indoor and outdoor units can be selected.
Indoor units: 125 model x 2 units
Outdoor unit: RP300 model
C. Calculating the capacity requirement
a) The cooling capacity of the tentatively selected outdoor unit apportioned to each indoor unit is 15.8 kW, which exceeds
the rated cooling capacity of the 125 model unit (14.0 kW). The actual cooling capacity under the specified conditions is
calculated as follows: 14.0 x 0.99 x 0.97 = 13.4 kW (where the return air temperature correction factor at the standard
outside temperature of 35ºCDB is 0.99 and the piping length correction factor is 0.97).
b) The heating capacity of the tentatively selected outdoor unit apportioned to each indoor unit is 16.8 kW, which exceeds
the rated cooling capacity of the 125 model unit (16.0 kW). The actual heating capacity under the specified conditions is
calculated as follows: 16.0 x 0.95 x 0.975 = 14.8 kW (where the return air temperature correction factor at the standard
outside temperature of 6ºCWB is 0.95 and the piping length correction factor is 0.975).
Indoor design dry-bulb temperature: 26ºC/Indoor design wet-bulb temperature: 18.5ºC
Outdoor design dry-bulb temperature: 36ºC
Cooling load: 13.5 kW for each of the two rooms
Indoor design dry-bulb temperature: 21ºC
Outdoor design wet-bulb temperature: 5ºC
Heating load: 14.5 kW for each of the two rooms
Main piping: ø28.58 x 45 m, Branch piping: ø19.05 x 5 m (Equivalent indoor and outdoor piping length: 50 m)
Outside air temperature 36ºCDB
Piping length: 50 m
Capacity correction factor 0.99 (at the standard indoor wet-bulb temperature of 19ºC)
Capacity correction factor: 0.97
OUTDOOR UNITS
47
8. UNIT SELECTION
(2) To connect indoor units using non-standard pipes
A. Calculating the cooling load
B. Calculating the heating load
Next, we will calculate the heating load, using the models that are selected based on the cooling load calculation.
Design conditions
<Cooling>
<Heating>
<Miscellaneous information>
a) The thermal load of 13 kW per room and the indoor unit return air temperature correction factor are used to calculate
the required indoor unit capacity, based on which a 125 model of indoor unit is tentatively selected. (Because the total
thermal load is 26 kW, the air temperature correction diagram for the 250 model outdoor unit will be used.)
b) Because the total capacity of indoor units (N) is 250, the 250 model outdoor unit is tentatively selected.
Based on the above, the standard capacity Qs will be 28 kW.
c) The correction values obtained from the air temperature correction factor graph and the piping length correction factor
graph for the 250 model outdoor units are as follows:
d) For the 300 model, the outside air temperature correction factor is 0.99, the pipe diameter correction factor for a 45 m
pipe with a diameter of ø25.4 is 0.98, and the piping length correction factor is 0.96 (read from the diagram for the unit
whose total indoor unit capacity N is 250).
Where the standard outdoor unit capacity Qs is 33.5 kW, the maximum outdoor unit capacity Qm can be obtained as
follows: Qm = 33.5 x 0.99 x 0.98 x 0.96= 31.2 kW. This value is greater than the thermal load Qi (27 kW), and the
maximum capacity Qm satisfies the capacity requirements.
e) Compare the thermal loads on the indoor unit side, using the maximum outdoor unit capacity apportioned to each
indoor unit and taking the indoor unit return air condition correction factors into consideration. The correction factor for
the return air temperature at 18.5ºC is 0.99 (at the standard outside dry-bulb temperature of 35ºC), and the pipe
diameter correction factor for a 5 m pipe with a diameter of ø15.88 connected to a 125-model unit is 0.99. These
values can be plugged into the following formula to obtain the capacity.
31.8 kW x 125/250 x 0.99 x 0.99=15.5 kW.
The result shows that the capacity (15.5 kW) is greater than the thermal load of 13.5 kW, and based on this result, two
125 model indoor units and one 300 model outdoor unit can be selected.
a) The standard capacity Qs of the tentatively selected (during cooling load calculation) 300 model outdoor unit is 37.5
kW.
The standard capacity Qs is corrected for indoor/outside air temperatures and piping length to obtain the maximum
outdoor unit capacity Qm as follows: Qm = 37.5 x 1.00 x 0.975 x 0.975 = 35.6 kW.
The result shows that the Maximum outdoor unit capacity Qm (35.6 kW) exceeds the heating load Qi (29 kW).
b) The correction values obtained from the air temperature correction factor graph and the piping length correction factor
graph for the 300 model outdoor units are as follows:
c) You can now check to see if this value will meet the capacity requirement for each indoor unit by using the following
formula: 35.6 x 125/250 x 0.96 x 0.99 = 16.9 kW (where the correction factor for the indoor unit return air temperature
of 21ºCDB is 0.96 (standard outside temperature at 6ºC), and the pipe diameter correction factor for a 5 m branch pipe
with a diameter of ø15.88 connected to a 125 models is 0.99. The result shows that the unit capacity 16.9 kW exceeds
the thermal load for each room (14.5 kW).
Based on the above calculation, the following indoor and outdoor units can be selected.
Indoor units: 125 model x 2 units
Outdoor unit: RP300 model
The standard capacity Qs is corrected for indoor/outside air temperatures, piping length, and pipe diameter to obtain the
maximum outdoor unit capacity Qm as follows: Qm = 28 x 0.99 x 0.97 x 0.98 = 26.3 kW. Because this value does not
meet the thermal load Qi (27 kW), a larger 300 model outdoor unit needs to be selected.
Indoor design dry-bulb temperature: 26ºC/Indoor design wet-bulb temperature: 18.5ºC
Outdoor design dry-bulb temperature: 36ºC
Cooling load: 13.5 kW for each of the two rooms
Indoor design dry-bulb temperature: 21ºC
Outdoor design wet-bulb temperature: 5ºC
Heating load: 14.5 kW for each of the two rooms
Main piping: ø25.4 x 45 m, Branch piping: ø15.88 x 5 m (Equivalent indoor and outdoor piping length: 50 m)
Outside air temperature 36ºCDB
Piping length: 50 m
Main piping: ø25.4 x 45 m
Capacity correction factor 0.99 (at the standard indoor wet-bulb temperature of 19ºC)
Capacity correction factor: 0.97
Pipe diameter correction factor: 0.98
Outside air temperature 5ºCWB
Piping length: 50 m
Capacity correction factor 1.00 (at the standard indoor dry-bulb temperature of 20ºC)
Defrost correction factor is 0.975
Capacity correction factor: 0.975
OUTDOOR UNITS 48
8. UNIT SELECTION
<Capacity requirement calculation flow chart>
Obtain the thermal load (Qi).
Correct for the indoor unit return air temperature.
Determine the capacity for each indoor unit.
Calculate the total indoor unit capacity (N).
Select the outdoor unit capacity (X).
Correct the standard outdoor unit capacity (Qs)
for outside air temperature and piping length to
obtain the corrected capacity (Qm).
Thermal load Qi > Corrected capacity Qm
NO
Apportion the corrected outdoor unit capacity (Qm)
to each indoor unit.
Multiply the apportioned capacity by the indoor
unit temperature correction factor, and make sure it
is equal to or greater than the thermal load.
YES
Select the outdoor unit one rank higher
in capacity.
Finish
(calculations to be done for both cooling and heating)
OUTDOOR UNITS
49
8. UNIT SELECTION
8-3. Pipe diameter correction factor
8-3-1. Correction factors for the outdoor units and main pipe diameter
PUHY-RP200YJM-A
1
0.90
0.80
0.70
Pipe diameter correction factor
0.60
020406080100
Equivalent main piping length (m)
PUHY-RP250YJM-A
1
0.90
0.80
0.70
Pipe diameter correction factor
Ø
25.4
Ø
22.2
Ø
19.05
Ø
25.4
Ø
22.2
PUHY-RP350YJM-A
1
0.90
0.80
0.70
Pipe diameter correction factor
0.60
0 20406080100
Equivalent main piping length (m)
PUHY-RP400YSJM-A
1
0.90
0.80
0.70
Pipe diameter correction factor
Ø
28.58
Ø
25.4
Ø
28.58
0.60
0 20406080100
Equivalent main piping length (m)
PUHY-RP300YJM-A
1
0.90
0.80
0.70
Pipe diameter correction factor
0.60
020406080100
Equivalent main piping length (m)
Ø
Ø
25.4
22.2
0.60
020406080100
Equivalent main piping length (m)
PUHY-RP450YSJM-A
1
0.90
0.80
0.70
Pipe diameter correction factor
0.60
0 20406080100
Equivalent main piping length (m)
Ø
28.58
OUTDOOR UNITS 50
8. UNIT SELECTION
Equivalent main piping length (m)
Ø
28.58
1
0.90
0.80
0.60
0.70
Pipe diameter correction factor
PUHY-RP500YSJM-A
020406080100
Equivalent main piping length (m)
Ø
28.58
Ø
34.93
1
0.90
0.80
0.60
0.70
Pipe diameter correction factor
PUHY-RP650YSJM-A
0 20406080100
Equivalent main piping length (m)
Ø
28.58
1
0.90
0.80
0.60
0.70
Pipe diameter correction factor
PUHY-RP550YSJM-A
0 20406080100
Equivalent main piping length (m)
Ø
34.93
1
0.90
0.80
0.60
0.70
Pipe diameter correction factor
PUHY-RP700YSJM-A
020406080100
Ø
28.58
Equivalent main piping length (m)
1
0.90
0.80
0.60
0.70
Pipe diameter correction factor
PUHY-RP600YSJM-A
020406080100
Equivalent main piping length (m)
Ø
34.93
1
0.90
0.80
0.60
0.70
Pipe diameter correction factor
PUHY-RP750YSJM-A
0 20406080100
OUTDOOR UNITS
51
8. UNIT SELECTION
PUHY-RP800YSJM-A
1
0.90
0.80
0.70
Pipe diameter correction factor
0.60
020406080100
Equivalent main piping length (m)
Ø
34.93
OUTDOOR UNITS 52
8. UNIT SELECTION
Branch piping length (m)
Ø
12.7
1
0.90
0.80
Pipe diameter correction factor
P50
01040
20
30
Ø
25.4
Ø
22.2
Branch piping length (m)
1
0.90
0.80
Pipe diameter correction factor
P250
01040
20
30
Ø
15.88
Branch piping length (m)
1
0.90
0.80
Pipe diameter correction factor
P100, P125, P140
01040
20
30
Ø
22.2
Ø
19.05
Branch piping length (m)
1
0.90
0.80
Pipe diameter correction factor
P200
01040
20
30
8-3-2. Correction factors for the indoor units and branch pipe diameter
OUTDOOR UNITS
53
8. UNIT SELECTION
8-3-3. Correction factors for the downstream indoor units and the pipes at the downstream of
the branch pipe
P81~P40
1
0.90
Pipe diameter correction factor
0.80
01040
Equivalent main piping length (m)
20
30
P161~P200
1
0.90
Ø
15.88
Ø
Ø
22.2
19.05
P331~P400
1
0.90
Pipe diameter correction factor
0.80
01040
Equivalent main piping length (m)
20
30
P401~P630
1
0.90
Ø
28.58
Ø
28.58
Pipe diameter correction factor
0.80
01040
Equivalent main piping length (m)
20
30
P201~P300
1
0.90
Pipe diameter correction factor
0.80
01040
Equivalent main piping length (m)
20
30
Ø
22.2
Pipe diameter correction factor
0.80
01040
Equivalent main piping length (m)
20
30
P631~P650
1
0.90
Pipe diameter correction factor
0.80
01040
Equivalent main piping length (m)
20
30
Ø
34.93
Ø
28.58
OUTDOOR UNITS 54
8. UNIT SELECTION
Equivalent main piping length (m)
Ø
34.93
1
0.90
0.80
Pipe diameter correction factor
P651~P800
01040
20
30
OUTDOOR UNITS
55
I.Optional parts for the heat source units1. JOINT
3. CENTER OF GRAVITY ................................................................................................................................... 62
6-1. Correction by temperature....................................................................................................................... 65
6-2. Correction by total indoor......................................................................................................................... 67
6-3. Correction by refrigerant piping length..................................................................................................... 68
6-4. Correction by port counts of the BC controller......................................................................................... 70
6-5. Correction at frost and defrost ................................................................................................................. 70
6-6. Operation temperature range .................................................................................................................. 71
7. UNIT SELECTION........................................................................................................................................... 72
7-1. Indoor and outdoor unit selection ............................................................................................................ 72
Approximate minimum
audible limit on
continuous noise
Standard
Low
50/60Hz
50/60Hz
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
Sound level of PURY-RP300YJM-A (-BS)
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
Approximate minimum
audible limit on
continuous noise
Standard
Low
50/60Hz
50/60Hz
Sound level of PURY-RP200YJM-A (-BS)
When Low Noise Mode is set,the A/C system's capacity is limited. The system could return to normal operation
from Low Noise Mode automatically in the case that the operation condition is severe.
Approximate minimum
audible limit on
continuous noise
Standard
Low
50/60Hz
50/60Hz
Sound level of PURY-RP250YJM-A (-BS)
5. SOUND LEVELS
OUTDOOR UNITS 64
6. CAPACITY TABLES
6. CAPACITY TABLES
6-1. Correction by temperature
CITY MULTI could have various capacities at different designing temperatures. Using the nominal cooling/heating capacity values
and the ratios below, the capacity can be found for various temperatures.
PURY-
Nominal
Cooling
Capacity
Input
PURY-
Nominal
Cooling
Capacity
Input
RP200YJM-A RP250YJM-A
kW
BTU/h
kW
22.4
76,400
5.23
RP300YJM-A
kW
BTU/h
kW
33.5
114,300
8.83
28.0
95,500
7.28
1.4
1.3
1.2
1.1
1.0
0.9
Ratio of cooling capacity
0.8
0.7
1.2
1.1
1.0
0.9
0.8
Ratio of power input
0.7
0.6
Indoor Temperature
PURY-
Nominal
Heating
Capacity
Input
PURY-
Nominal
Heating
Capacity
Input
RP200YJM-A RP250YJM-A
kW
BTU/h
kW
25.0
85,300
5.81
RP300YJM-A
kW
BTU/h
kW
37.5
128,000
9.48
31.5
107,500
7.72
0.5
-5051015202530354045
233241505968778695104113
1.3
1.2
1.1
1.0
0.9
0.8
Ratio of heating capacity
0.7
0.6
1.0
0.9
0.8
Ratio of cooling capacity and power inputOutdoor temperature
Indoor Temperature
0.7
Ratio of power input
0.6
0.5
0.4
-20
-4
-15
5
OUTDOOR UNITS
-10
14
Ratio of heating capacity and power inputOutdoor temperature
-5
23
0
32
5
41
10
50
15
59
65
6. CAPACITY TABLES
Ratio of cooling capacity and power inputOutdoor temperature
Ratio of heating capacity and power inputOutdoor temperature
-5051015202530354045
233241505968778695104113
1.1
1.2
1.0
0.9
0.8
0.7
0.6
0.5
Ratio of power input
-20
-4
-15
5
-10
14
-5
23
0
32
5
41
10
50
15
59
0.6
0.5
1.2
1.4
1.6
1.0
0.8
0.6
0.4
Ratio of power input
1.4
1.3
1.1
1.0
0.9
0.8
0.7
1.2
Ratio of cooling capacity
Indoor Temperature
1.3
1.2
1.0
0.9
0.8
0.7
1.1
Ratio of heating capacity
Indoor Temperature
Nominal
Cooling
Capacity
Input
kW
BTU/h
kW
Nominal
Heating
Capacity
Input
kW
BTU/h
kW
PURY-
RP200YJM-A RP250YJM-A
PURY-
RP200YJM-A RP250YJM-A
22.4
76,400
5.23
28.0
95,500
7.28
25.0
85,300
5.81
31.5
107,500
7.72
Nominal
Cooling
Capacity
Input
kW
BTU/h
kW
PURY-
RP300YJM-A
33.5
114,300
8.83
Nominal
Heating
Capacity
Input
kW
BTU/h
kW
PURY-
RP300YJM-A
37.5
128,000
9.48
Correction by temperature (High Heating Performance Mode)
CITY MULTI could have various capacities at different designing temperatures. Using the nominal cooling/heating capacity values and the ratios below, the capacity can be found for various temperatures.
To select high heating performance mode, DipSW 3-7 must be set to ON. (In the low ambient temperature, heating capacity
and power input become higher than those under standard mode.)
OUTDOOR UNITS 66
6. CAPACITY TABLES
Capacity(kW)
Input(kW)
Total capacity of indoor units
15.0
10.0
10.0
20.0
25.0
30.0
35.0
2.0
6.0
8.0
4.0
100200300400
100200300400500
Capacity(kW)
Input(kW)
Total capacity of indoor units
10.0
20.0
30.0
40.0
50.0
2.0
6.0
4.0
10.0
12.0
8.0
Cooling
Heating
Cooling
Heating
Cooling
Heating
RP300
RP200RP250
PURY-RP200, 250YJM-A (-BS)
PURY-RP300YJM-A (-BS)
6-2. Correction by total indoor
CITY MULTI system has different capacity and input at different total capacity of indoor unit connected. Using following tables, the
maximum capacity can be observed so as to ensure the system having enough capacity to meet the conditions.
OUTDOOR UNITS
67
6. CAPACITY TABLES
Piping equivalent length (m)
1
0.90
0.80
0.95
0.85
0.75
0.65
0.70
Cooling capacity correction factor
PURY-RP200YJM-A (-BS)
Total capacity of indoor unit
100
150
200
300
020406080100120
Piping equivalent length (m)
1
0.90
0.80
0.95
0.85
0.75
0.65
0.70
Cooling capacity correction factor
PURY-RP250YJM-A (-BS)
Total capacity of indoor unit
125
188
250
375
020406080100120
Piping equivalent length (m)
1
0.90
0.80
0.95
0.85
0.75
0.65
0.70
Cooling capacity correction factor
PURY-RP300YJM-A (-BS)
Total capacity of indoor unit
150
225
300
450
020406080100120
6-3. Correction by refrigerant piping length
CITY MULTI system can extend the piping flexibly within its limitation for the actual situation. Yet, a decrease of cooling/heating
capacity could happen correspondently. Using following correction factor according to the equivalent length of the piping shown at
6-3-1 and 6-3-2, the capacity can be observed. 6-3-3 shows how to obtain the equivalent length of piping.
6-3-1. Cooling capacity correction
OUTDOOR UNITS 68
6. CAPACITY TABLES
6-3-2. Heating capacity correction
PURY-RP200YJM-A (-BS)
1.00
0.95
0.90
Heating capacity correction factor
0.85
020406080100120
Piping equivalent length (m)
PURY-RP250YJM-A (-BS)
1.00
0.95
0.90
Heating capacity correction factor
0.85
020406080100120
Piping equivalent length (m)
PURY-RP300YJM-A (-BS)
1.00
0.95
0.90
Heating capacity correction factor
0.85
020406080100120
Piping equivalent length (m)
OUTDOOR UNITS
69
6. CAPACITY TABLES
6-3-3. How to obtain the equivalent piping length
1. PURY-RP200YJM-A (-BS)
Equivalent length = (Actual piping length to the farthest indoor unit ) + (0.35 x number of bent on the piping) [m]
2. PURY-RP250, 300YJM-A (-BS)
Equivalent length = (Actual piping length to the farthest indoor unit ) + (0.42 x number of bent on the piping) [m]
6-4. Correction by port counts of the BC controller
Indoor unit sizes P200 and P250 must be connected to 2 ports on the BC controller.
Indoor unit sizes from P100 to P140 should normally be connected to 2 ports on the BC controller (set BC controller DIP-SW 4-6
to its ON position).
In cases whereby indoor unit sizes from P100 to P140 are connected to only 1port on the BC controller (set BC controller DIP-SW
4-6 to its OFF position), the cooling capacity of the indoor unit should be multiplied by a correction factor of 0.97.
6-5. Correction at frost and defrost
Due to frost at the outdoor heat exchanger and the automatic defrost operation, the heating capacity of the outdoor unit can be
calculated by multiplying the correction factor shown in the table below.
-6 to 15.5 CWB (21 to 60 FWB)15 to 24 CWB (59 to 75 FWB)
15 to 27 CDB (59 to 81 FDB)
Indoor temperature
CoolingHeating
Ref.: PURY_YHM-A_TMPRNG_EUDB_ALL
Combination of cooling/heating operation (Cooling main or Heating main)
6-6. Operation temperature range
OUTDOOR UNITS
71
7. UNIT SELECTION
(1) Selecting indoor units
(2) Selecting outdoor units
1) Calculate the thermal road of each room.
2) Based on the thermal load corrected for indoor unit return air temperature, select appropriate indoor unit models.
Refer to the correction factor diagram for the outdoor unit whose capacity is the closest to the total thermal load of the
system (Qi). Refer to “CAPACITY TABLES (Indoor unit)” and “6. CAPACITY TABLES.”
3) Calculate the total capacity of the indoor units in the system (N).
1) Based on the total capacity of the indoor units (N), tentatively select the capacity of the outdoor unit (X).
The total capacity of the indoor units to be connected to a given outdoor unit (N) should not exceed the maximum
connectable capacity of the outdoor unit.
2) The tentatively selected standard capacity of the outdoor unit (X) will be defined as Qs.
* If the total capacity of the indoor units that are connected to a given outdoor unit exceeds 100% of the outdoor unit
capacity (X), refer to the outdoor unit partial load capacity table, find the capacity that corresponds to the total capacity
N, and use it as the standard outdoor unit capacity (Qs).
3) Obtain the maximum outdoor unit capacity (Qm) by multiplying Qs (standard outdoor unit capacity) by the following
correction factors: piping length, outside air temperature, and defrost (heating).
Find the piping length correction factor from the diagram that corresponds to the total indoor unit capacity (N).
4) Make sure the maximum outdoor unit capacity Qm is equal to or greater than the total thermal load Qi.
If Qm is smaller than Qi, reconsider the outdoor unit capacity (X) so that Qm ≥ Qi will hold true.
5) After selecting indoor and outdoor units, calculate the apportioned indoor unit capacity, and make sure that the formula
"Thermal load ≤ Indoor unit capacity" will hold true for each room.
If the thermal load exceeds the indoor unit capacity in one or more rooms, increase the indoor unit size as long as doing so
will not exceed the maximum connectable capacity of the outdoor unit. Then, start over from step 1) above. If the
maximum connectable capacity is exceeded by increasing the indoor unit capacity, increase the outdoor capacity as well,
then start over from step 1) above.
Qm = Qs x Piping length correction factor x Outside air temperature correction factor
x Defrost correction factor (heating only) x Pipe diameter correction factor
Outside air temperature correction factor
Piping length correction factor
Defrost correction factor (heating only)
Pipe diameter correction factor (applicable only if non-standard size pipes are connected)
Refer to 6-1.
Refer to 6-3.
Refer to 6-4.
Refer to 8-3.
Calculate the indoor/outdoor unit capacities and check for unit compatibility by
considering both the heating and the cooling loads. If the formula Qm ≥ Qi does not
hold true for either cooling or heating, reconsider the outdoor unit capacity (X).
7. UNIT SELECTION
7-1. Indoor and outdoor unit selection
OUTDOOR UNITS 72
7. UNIT SELECTION
(3) Obtaining the unit capacity
A. If the apportioned indoor unit capacity obtained in step 5) on the previous page is equal to or greater than the rated
indoor unit capacity, the following formula will be used to calculate the indoor unit capacity: "Rated capacity x return air
temperature correction factor x piping length correction factor (x pipe diameter correction factor)".
B. If the apportioned indoor unit capacity obtained in step 5) on the previous page is smaller than the rated indoor unit
capacity, the following formula will be used to calculate the indoor unit capacity: "Apportioned indoor unit capacity x
return air temperature correction factor."
* The standard outside air temperatures used to obtain the return air temperature correction factor is 35ºCDB for cooling
and 6ºCWB for heating.
* If non-standard size pipes are connected, use the pipe diameter correction factors for the main pipes, merge pipes, and
branch pipes.
(4) Notes
When deciding the outside air temperature to calculate unit capacity requirements, take into consideration the possible
temperature rise around the outdoor unit due to short-cycling. (When installing outdoor units collectively on the rooftop or if
outdoor units are surrounded by walls or other objects, it is recommended to set the outside temperature as 43ºC for
calculation.)
If you want to take sensible heat load into consideration, refer to the relevant catalogs for information on sensible heat
factor when selecting indoor units.
OUTDOOR UNITS
73
7. UNIT SELECTION
(1) To connect indoor units using the standard pipes
A. Calculating the cooling load
B. Calculating the heating load
C. Calculating the capacity requirement
Design conditions
<Cooling>
<Heating>
<Miscellaneous information>
a) The thermal load (13.5 kW/room), indoor unit return air temperature correction factor, and piping length correction
factor are used to calculate the required indoor unit capacity, based on which a 125 model of indoor unit is tentatively
selected. (Because the total thermal load is 27 kW, the air temperature correction diagram for the 250 model outdoor
unit will be used.)
b) Because the total capacity of indoor units (N) is 250, the 250 model outdoor unit is tentatively selected.
Based on the above, the standard capacity Qs will be 28 kW.
c) The correction values obtained from the air temperature correction factor graph and the piping length correction factor
graph for the 250 model outdoor units are as follows:
d) For the 300 model units, the outside air temperature correction factor is 0.99. The piping length correction factor that
can be obtained from the diagram for the system whose total indoor unit capacity is 250 would be 0.96.
Because the standard outdoor unit capacity Qs is 33.5 kW, the maximum outdoor unit capacity Qm can be obtained
using the following formula: Qm = 33.5 x 0.99 x 0.96 = 31.8 kW. The result 31.8 kW is greater than the Qi (27 kW), so
the maximum capacity Qm meets the capacity requirement.
e) Compare the thermal loads on the indoor units, using the maximum outdoor unit capacity apportioned to each indoor
unit and taking the indoor unit return air temperature correction factors into consideration. The correction factor for the
return air temperature at 18.5ºCWB is 0.99 (at the standard outside dry-bulb temperature of 35ºC), and this value can
be plugged into the following formula to obtain the capacity.
32.1 kW x 125/250 x 0.99 = 15.8 kW
The result shows that the capacity (15.8 kW) is greater than the thermal load (13.5 kW), and based on this result, two
125 model indoor units and one 300 model outdoor unit can be selected.
a) The standard capacity (Qs) of the tentatively selected 300 model outdoor unit is 37.5 kW.
b) Use this value in the following formula to obtain the maximum outdoor unit capacity Qm as shown below:
Qm = 37.5 x 1.00 x 0.965 x 0.975 = 35.2 kW, (where the outside air temperature is 5ºCWB, capacity correction factor
is 1.00 (at the standard indoor dry-bulb temperature of 20ºC), defrost correction factor is 0.965, piping length is 50 m,
and capacity correction factor is 0.975).
The result shows that the Maximum outdoor unit capacity Qm (35.2 kW) exceeds the heating load Qi (29 kW).
c) You can now check to see if this value will meet the capacity requirement for each indoor unit by using the following
formula: 35.2 x 125/250 x 0.96 = 16.8 kW (where the indoor unit return air temperature correction factor at 21ºCDB is
0.96) (standard outside temperature at 6ºC). The result shows that the unit capacity (16.8 kW) exceeds the thermal
load for each room (14.5 kW).
Based on the above calculation, the following indoor and outdoor units can be selected.
Indoor units: 125 model x 2 units
Outdoor unit: RP300 model
a) The cooling capacity of the tentatively selected outdoor unit apportioned to each indoor unit is 15.8 kW, which exceeds
the rated cooling capacity of the 125 model unit (14.0 kW). The actual cooling capacity under the specified conditions is
calculated as follows: 14.0 x 0.99 x 0.97 = 13.4 kW (where the return air temperature correction factor at the standard
outside temperature of 35ºCDB is 0.99 and the piping length correction factor is 0.97).
b) The heating capacity of the tentatively selected outdoor unit apportioned to each indoor unit is 16.8 kW, which exceeds
the rated cooling capacity of the 125 model unit (16.0 kW). The actual heating capacity under the specified conditions is
calculated as follows: 16.0 x 0.95 x 0.975 = 14.8 kW (where the return air temperature correction factor at the standard
outside temperature of 6ºCWB is 0.95 and the piping length correction factor is 0.975).
If the standard capacity Qs is corrected for indoor/outside air temperatures and piping length, the maximum outdoor unit
capacity Qm can be obtained as follows: Qm = 28 x 0.99 x 0.97 = 26.8 kW.
The result shows that the thermal load Qi (27 kW) exceeds the unit capacity Qm, so a larger 300 model outdoor unit
needs to be selected.
Main piping: ø28.58 x 45 m, Branch piping: ø19.05 x 5 m (Equivalent indoor and outdoor piping length: 50 m)
Indoor design dry-bulb temperature: 26ºC/Indoor design wet-bulb temperature: 18.5ºC
Outdoor design dry-bulb temperature: 36ºC
Cooling load: 13.5 kW for each of the two rooms
Indoor design dry-bulb temperature: 21ºC
Outdoor design wet-bulb temperature: 5ºC
Heating load: 14.5 kW for each of the two rooms
Outside air temperature 36ºCDB
Piping length: 50 m
Capacity correction factor 0.99 (at the standard indoor wet-bulb temperature of 19ºC)
Capacity correction factor: 0.97
Next, you will calculate the heating load and unit capacity requirements, using the models that were selected in the
previous section.
7-2. Calculation samples
OUTDOOR UNITS 74
7. UNIT SELECTION
(2) To connect indoor units using non-standard pipes
Design conditions
<Cooling>
<Heating>
<Miscellaneous information>
A. Calculating the cooling load
a) The thermal load of 13 kW per room and the indoor unit return air temperature correction factor are used to calculate
the required indoor unit capacity, based on which a 125 model of indoor unit is tentatively selected. (Because the total
thermal load is 26 kW, the air temperature correction diagram for the 250 model outdoor unit will be used.)
b) Because the total capacity of indoor units (N) is 250, the 250 model outdoor unit is tentatively selected.
Based on the above, the standard capacity Qs will be 28 kW.
c) The correction values obtained from the air temperature correction factor graph and the piping length correction factor
graph for the 250 model outdoor units are as follows:
Indoor design dry-bulb temperature: 26ºC/Indoor design wet-bulb temperature: 18.5ºC
Outdoor design dry-bulb temperature: 36ºC
Cooling load: 13.5 kW for each of the two rooms
Indoor design dry-bulb temperature: 21ºC
Outdoor design wet-bulb temperature: 5ºC
Heating load: 14.5 kW for each of the two rooms
Main piping: ø25.4 x 45 m, Branch piping: ø15.88 x 5 m (Equivalent indoor and outdoor piping length: 50 m)
Outside air temperature 36ºCDB
Piping length: 50 m
Main piping: ø25.4 x 45 m
The standard capacity Qs is corrected for indoor/outside air temperatures, piping length, and pipe diameter to obtain the
maximum outdoor unit capacity Qm as follows: Qm = 28 x 0.99 x 0.97 x 0.98 = 26.3 kW. Because this value does not
meet the thermal load Qi (27 kW), a larger 300 model outdoor unit needs to be selected.
d) For the 300 model, the outside air temperature correction factor is 0.99, the pipe diameter correction factor for a 45 m
pipe with a diameter of ø25.4 is 0.98, and the piping length correction factor is 0.96 (read from the diagram for the unit
whose total indoor unit capacity N is 250).
Where the standard outdoor unit capacity Qs is 33.5 kW, the maximum outdoor unit capacity Qm can be obtained as
follows: Qm = 33.5 x 0.99 x 0.98 x 0.96= 31.2 kW. This value is greater than the thermal load Qi (27 kW), and the
maximum capacity Qm satisfies the capacity requirements.
e) Compare the thermal loads on the indoor unit side, using the maximum outdoor unit capacity apportioned to each
indoor unit and taking the indoor unit return air condition correction factors into consideration. The correction factor for
the return air temperature at 18.5ºC is 0.99 (at the standard outside dry-bulb temperature of 35ºC), and the pipe
diameter correction factor for a 5 m pipe with a diameter of ø15.88 connected to a 125-model unit is 0.99. These
values can be plugged into the following formula to obtain the capacity.
31.8 kW x 125/250 x 0.99 x 0.99=15.5 kW.
The result shows that the capacity (15.5 kW) is greater than the thermal load of 13.5 kW, and based on this result, two
125 model indoor units and one 300 model outdoor unit can be selected.
B. Calculating the heating load
Next, we will calculate the heating load, using the models that are selected based on the cooling load calculation.
a) The standard capacity Qs of the tentatively selected (during cooling load calculation) 300 model outdoor unit is 37.5
kW.
b) The correction values obtained from the air temperature correction factor graph and the piping length correction factor
graph for the 300 model outdoor units are as follows:
Capacity correction factor 0.99 (at the standard indoor wet-bulb temperature of 19ºC)
Capacity correction factor: 0.97
Pipe diameter correction factor: 0.98
Outside air temperature 5ºCWB
Piping length: 50 m
The standard capacity Qs is corrected for indoor/outside air temperatures and piping length to obtain the maximum
outdoor unit capacity Qm as follows: Qm = 37.5 x 1.00 x 0.975 x 0.975 = 35.6 kW.
The result shows that the Maximum outdoor unit capacity Qm (35.6 kW) exceeds the heating load Qi (29 kW).
c) You can now check to see if this value will meet the capacity requirement for each indoor unit by using the following
formula: 35.6 x 125/250 x 0.96 x 0.99 = 16.9 kW (where the correction factor for the indoor unit return air temperature
of 21ºCDB is 0.96 (standard outside temperature at 6ºC), and the pipe diameter correction factor for a 5 m branch pipe
with a diameter of ø15.88 connected to a 125 models is 0.99. The result shows that the unit capacity 16.9 kW exceeds
the thermal load for each room (14.5 kW).
Based on the above calculation, the following indoor and outdoor units can be selected.
Indoor units: 125 model x 2 units
Outdoor unit: RP300 model
Capacity correction factor 1.00 (at the standard indoor dry-bulb temperature of 20ºC)
Defrost correction factor is 0.975
Capacity correction factor: 0.975
OUTDOOR UNITS
75
7. UNIT SELECTION
<Capacity requirement calculation flow chart>
Obtain the thermal load (Qi).
Correct for the indoor unit return air temperature.
Determine the capacity for each indoor unit.
Calculate the total indoor unit capacity (N).
Finish
(calculations to be done for both cooling and heating)
Select the outdoor unit capacity (X).
Select the outdoor unit one rank higher
in capacity.
Apportion the corrected outdoor unit capacity (Qm)
to each indoor unit.
Multiply the apportioned capacity by the indoor
unit temperature correction factor, and make sure it
is equal to or greater than the thermal load.
Thermal load Qi > Corrected capacity Qm
YES
NO
Correct the standard outdoor unit capacity (Qs)
for outside air temperature and piping length to
obtain the corrected capacity (Qm).
OUTDOOR UNITS 76
7. UNIT SELECTION
Equivalent main piping length (m)
Ø
19.05
Ø
22.2
Ø
25.4
1
0.90
0.80
0.60
0.70
Pipe diameter correction factor
PURY-RP200YJM-A
020406080100
Equivalent main piping length (m)
Ø
22.2
Ø
25.4
1
0.90
0.80
0.60
0.70
Pipe diameter correction factor
PURY-RP250YJM-A
0 20406080100
Equivalent main piping length (m)
Ø
22.2
Ø
25.4
1
0.90
0.80
0.60
0.70
Pipe diameter correction factor
PURY-RP300YJM-A
020406080100
7-3. Pipe diameter correction factor
7-3-1. Correction factors for the outdoor units and main pipe diameter
OUTDOOR UNITS
77
7. UNIT SELECTION
7-3-2. Correction factors for the indoor units and branch pipe diameter
P50
1
0.90
Pipe diameter correction factor
0.80
01040
Branch piping length (m)
20
30
P100, P125, P140
1
0.90
Ø
12.7
Ø
15.88
P250
1
0.90
Pipe diameter correction factor
0.80
01040
Branch piping length (m)
20
30
Ø
Ø
25.4
22.2
Pipe diameter correction factor
0.80
01040
Branch piping length (m)
20
30
P200
1
0.90
Pipe diameter correction factor
0.80
01040
Branch piping length (m)
20
30
Ø
22.2
Ø
19.05
OUTDOOR UNITS 78
7. UNIT SELECTION
Equivalent main piping length (m)
Ø
15.88
1
0.90
0.80
Pipe diameter correction factor
P81~P40
01040
20
30
Equivalent main piping length (m)
1
0.90
0.80
Pipe diameter correction factor
Ø
28.58
P331~P400
01040
20
30
Equivalent main piping length (m)
Ø
22.2
Ø
19.05
1
0.90
0.80
Pipe diameter correction factor
P161~P200
01040
20
30
Equivalent main piping length (m)
Ø
28.58
1
0.90
0.80
Pipe diameter correction factor
P401~P630
01040
20
30
Equivalent main piping length (m)
Ø
22.2
1
0.90
0.80
Pipe diameter correction factor
P201~P300
01040
20
30
Equivalent main piping length (m)
Ø
28.58
Ø
34.93
1
0.90
0.80
Pipe diameter correction factor
P631~P650
01040
20
30
7-3-3. Correction factors for the downstream indoor units and the pipes at the downstream of