7
■Dx-Coil design guideline
•AHU / DX-Coil Notes & Features:-
Cooling & Heating output figures are based on calculations and ‘general’ test data. All figures are to be taken as
approximations. The properties of the 3
rd
Party DX-Coil will have an effect on the performance of the Outdoor units.
The DX Coil must be suitable for R410A.
The design should allow operation as both an Evaporator and a Condenser
(Features: Multiple circuits / Liquid Capillary Distributor / Gas Header)
The counter flow principle must be observed for the DX coil design
A Drain Pan must be fitted (even if only used in Heat mode) due to defrost cycles
It is recommended to fit droplet eliminator plates in the discharge air stream if used
in cooling mode.
• Dx-coil design guideline
Be sure to refer to the guideline for 3
rd
party Coil and AHU design to ensure the operation.
Capacity code
012
015
018
021
024
030
036
042
048
060
072
096
Tonnage
1
1.25
1.5
1.75
2
2.5
3
3.5
4
5
6
8
Cooling Capacity
12
15.4
18
21
24
30
36
42
48
60
72
96
Air volume
(cfm)
Standard
350
450
550
650
800
850
950
1,150
1,250
1,650
2,150
2,500
Min.
280
360
440
520
640
680
760
920
1,000
1,320
1,720
2,000
Max.
420
540
660
780
960
1,020
1,140
1,380
1,500
1,980
2,580
3,000
Coil internal
volume
(inch
3
)
Standard
40
50
60
70
80
100
120
140
150
200
250
310
Min.
34
43
51
60
68
85
102
119
128
170
213
264
Max.
46
58
69
81
92
115
138
161
173
230
288
357
Number
of circuits
by U-Pipe
diameter
5/16”
Min.
2
3
3
3
3
4
5
6
6
6
8
10
Max.
3
4
4
4
4
6
8
8
8
8
12
14
3/8”
Min.
2
2
2
2
2
3
3
4
4
4
6
8
Max.
2
3
3
3
3
4
5
6
6
6
10
12
1/2 “
Min.
2
2
2
2
2
2
2
3
3
3
4
5
Max.
2
2
2
2
2
2
3
3
3
4
6
6
Distributor Orifice
size (ID inch)
Min.
0.10
0.10
0.12
0.12
0.14
0.16
0.17
0.20
0.20
0.21
0.25
0.27
Max.
0.12
0.12
0.14
0.14
0.16
0.18
0.20
0.24
0.24
0.24
0.28
0.32
Design evaporating
temperature
44°F
Suction Superheat
8°F
Evaporator air suction
temp.
80°F (DB) / 67°F (WB)
Design condensing
temperature
126°F
Sub cooling
12°F
Condenser air suction
temp.
70°F (DB)
Diversity
60 to 110%
Cooling ”Air ON” temp.
(*1)
59°F to 75°F (WB)
Heating ”Air ON” temp.
(*1)
59°F to 83°F (DB)