Daikin REMQ120PTJU, Engineering Data

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EDUS39-802A-R2_a
48 REYQ-P Heat Recovery (208-230V)
REYQ144PTJU
[Explanation of symbols] Hp : Level difference (ft) between indoor and outdoor units where
indoor unit in inferior position
H
M
: Level difference (ft) between indoor and outdoor units where
indoor unit in superior position
L
: Equivalent pipe length (ft)
α
: Capacity correction factor
[Diameter of pipe (standard size)]
1. Rate of change in cooling capacity
0.97
0.97
0.95
0.95
0.92
0.92
0.90
0.90
1.0
1.0
40
120
120 240
400
80
280
240
360
200
80
0
200
600
280
440
160
520
560
0
40
320
0
160 120
480
40
80
160
Hp (ft) H
M
(ft)
L (ft)
1.0
1.0
2. Rate of change in heating capacity
0
80 40
280
0
240 160 200
80 40
160 120
120
80
40
200
240
160
320
280
360
0
120
Hp (ft)
H
M
(ft)
L (ft)
[Notes] 1. These figures illustrate the rate of change in capacity of a standard indoor unit system at
maximum load (with the thermostat set to maximum) under standard conditions. Moreover, under partial load conditions there is only a minor deviation from the rate of change in capacity shown in the above figures.
2. With this outdoor unit, evaporating pressure constant control when cooling, and condensing
pressure constant control when heating is carried out.
3. Method of calculating A/C (cooling/heating) capacity:
The maximum A/C capacity of the system will be either the total A/C capacity of the indoor units obtained from capacity characteristic table or the maximum A/C capacity of outdoor units as mentioned bellow, whichever smaller. Calculating A/C capacity of outdoor units
•
Condition: Indoor unit combination ratio does not exceed 100%. Maximum A/C capacity of outdoor units = A/C capacity of outdoor units obtained from capacity
characteristic table at the 100% combination
× Capacity change rate due to piping length to the
farthest indoor unit
•
Condition: Indoor unit combination ratio exceeds 100%. Maximum A/C capacity of outdoor units = A/C capacity of outdoor units obtained from capacity
characteristic table at the combination
× Capacity change rate due to piping length to the
farthest indoor unit
4. When overall equivalent pipe length is 295.3ft or more, the diameter of the main liquid pipes
(outdoor unit-branch sections) must be increased. When level difference is 164.0ft or more, the diameter of the main liquid pipe (outdoor unit-branch sections) must be increased. [Diameter of above case]
liquid
Model
REYQ144PYDN REYQ144PTJU
φ
5/8
6. In the combination which does not include cooling only indoor unit, Calculate the
equivalent length pipe by the following when you calculate cooling capacity.
200ft
Indoor unit
100ft
Equivalent length
Outdoor unit
Branch
BS unit
Equivalent length
(Example)
5. When the main sections of the interunit liquid pipe diameters are increased the overall equivalent
length should be calculated as follows. (Heating only)
200ft
Indoor unit
100ft
Equivalent length
Outdoor unit
Branch
BS unit
Liquid pipe : Size increase
Equivalent length
(Example)
In the above case (Heating)
Overall equivalent length = 200ft × 0.3 + 100ft = 160ft The correction factor in capacity when Hp = 0ft is thus approximately 1.0.
liquid
Model
REYQ144PYDN REYQ144PTJU
φ
1/2
In the above case (Cooling)
Overall equivalent length = 200ft × 0.5 + 100ft = 200ft The correction factor in capacity when Hp = 0ft is thus approximately 0.96.
Overall equivalent length = Equivalent length to main pipe × 0.5 + Equivalent length after branching Overall equivalent length = Equivalent length to main pipe × 0.3 + Equivalent length after branching
3D058629