Daikin RXTQ-TAVJ9A Manual page 50

RXTQ-TAVJ9A / TAVJUA
-Confirm capacity correction factor by piping length and level difference (K1)
(K1) = 0.94
-Calculate capacity correction factor by piping heat loss (K2)
(K2) = 1 + (heat loss factor per feet of piping × (equivalent piping length – 25 ft.)) / 100
In cooling mode, heat loss factor per feet at 93°F is calculated as below.
(R) Heat loss factor per feet = 0.072
Using "Equivalent piping length = 100 ft." and "Heat loss factor per feet = 0.0922",
(K2) = 1 + (0.0922 × (100 – 25)) / 100 = 1.07
Cooling
41°F
Heat loss factor per feet
of piping (%)
0.000
Heating
5°F
Heat loss factor per feet
of piping (%)
0.328
-Calculate the corrected capacity of RXTQ60TAVJUA (C) by using (K1) and (K2).
Corrected capacity of RXTQ60TAVJUA (C) = (B) × (K1) / (K2) (add defrost correction factor for heating capacity)
Therefore (C) = 62.7 × 0.94 / 1.07 = 55.1 MBH
If the corrected capacity (C) is the same or greater than the required total heat load (A), selection is complete.
If (C) < (A), return to Procedure [3]–2 and provisionally select a larger outdoor unit.
In this example, 55.1 MBH (C) > 49.8 MBH (A), so there is no need to select a larger outdoor unit.
100
10
+ (0.098 – 0.072
*2 *1
Ambient temperature
50°F 59°F 68°F
0.000 0.013 0.030
Ambient temperature
14°F 23°F 32°F
0.305 0.282 0.256
) × (93 – 86 ) / (95 – 86
*2 *3 *4 *5 *4
77°F 86°F 93°F
*4
0.046 0.072 (R)
*2
41°F 50°F 59°F
0.233 0.210 0.187
48
) = 0.0922
95°F 104°F
*3 *5
0.098 0.125
*1
68°F
0.161
EDUS331608C-D