MXZ-SM36NAMHZ Service Manual

17
OCH789
Capacity of indoor unit
(kBtu/h)
Model Number
for indoor unit
Model 04 Model 05 Model 06 Model 08 Model 12 Model 15 Model 18 Model 24 Model 27 Model 30 Model 36 Model 48 Model 54
Model
Capacity
4.5 5.6 6.7 9.0 13.5 17.0 20.0 27.0 30.0 34.0 40.0 54.0 60.0
(7) Comparison with Essential Load
Against the essential load 30.3 kBtu/h, the maximum system capacity is 32.4 kBtu/h: Proper outdoor units have been selected.
(8) Calculation of Maximum Indoor Unit Capacity of Each Room
CTx = CTi, thus, calculate by the calculation below
Room1
Indoor Unit Rating × Indoor Design Temperature Correction
= 15.0 × 1.02
= 15.3 kBtu/h
OK: fulfills the load 13.6 kBtu/h
Room2
Indoor Unit Rating × Indoor Design Temperature Correction
= 18.0 × 0.95
= 17.1 kBtu/h OK: fulfills the load 16.7 kBtu/h
Go on to the heating trial calculation since the selected units fulfill the cooling loads of Room 1, 2.
<Heating>
Design Condition
Outdoor Design Wet Bulb Temperature 35.6ºF (2.0ºC)
Total Heating Load 34.4 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 328 ft
Model
name
Capacity class
06 09 12 15 18 24 30 36
SVZ - - 12.0 - 18.0 27.0 34.0 40.0
SLZ-KF - 10.2 13.7 17.1 - - - -
SEZ-KD - 10.9 13.6 18.0 17.2 - - -
MFZ-KJ - 10.9 13.0 18.0 21.0 - - -
MLZ-KP - 10.9 13.0 - 21.0 - - -
MSZ-FH 6.0 10.9 13.6 18.0 20.3 - - -
MSZ-FS 6.0 10.9 13.6 18.0 20.3 - - -
MSZ-GL 6.0 10.9 14.4 18.0 21.6 27.6 - -
MSZ-EF - 10.9 13.0 18.0 21.0 - - -
PEAD - 10.9 13.5 15.7 18.0 26.0 34.0 40.0
PLA - - 13.5 - 18.0 26.0 34.0 40.0
2. Heating Calculation
(1) Temporary Selection of Indoor Units
Room1
PEFY-P15 17.0 kBtu/h (Rated)
20.0 kBtu/h (Rated)
Room2
PEFY-P18
(2) Total Indoor Units Capacity
P15 + P18 = P33
(3) Selection of Outdoor Unit
The P36 outdoor unit is selected as total indoor units capacity is P33
MXZ-SM36NAM 42.0 kBtu/h
(4) Total Indoor Units Capacity Correction Calculation
Room1
Indoor Design Dry Bulb Temperature Correction (69.8ºF)
1.00 (Refer to Figure 4)
Room2
Indoor Design Dry Bulb Temperature Correction (73.4ºF)
0.92 (Refer to Figure 4)
CTi = Σ (Indoor Unit Rating × Indoor Design Temperature Correction)
= 17.0 × 1.00 + 20.0 × 0.92
= 35.4 kBtu/h
Total Indoor Units Capacity (CTi)
Figure 4 Indoor unit temperature correction
To be used to correct indoor unit only
Figure 5 Outdoor unit temperature correction
To be used to correct outdoor unit only
15 16 17 18 19 20 21 22 23 24 25 26 27
59 60.8 62.6 64.4 66.2 68 69.8 71.6 73.4 75.2 77 78.8 80.6
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
Ratio of heating capacity
Indoor Temperature
[°C D.B.]
[°F D.B.]
Indoor
Temperature
-25
-20 -15 -10 -5 0 5 10
15
-13
-4 5 14 23 32 41 50
59
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
Ratio of heating capacity
Outdoor Temperature
[°C W.B.]
[°F W.B.]
21.1°C (70.0°F) D.B.