Unit Heater Mounting Height - Daikin UHH Installation Instructions Manual

Installation
Unit Heater Mounting Height & Mounting Height Correction Factors
Do not install unit above recommended maximum mounting heights or below the minimum height of eight feet. The
height at which unit heaters are installed is critical. See Tables 1 thru 4. Maximum mounting heights for Model UDH is
given for units with or without air diffusion accessories.
Table 1. Horiz. Air Maximum Mounting Height and Spread
Height-Ft./Spread-Ft.
Model
Size
H S
UHH-18
9
17
UHH-24
9 18
UHH-33
10 0
UHH-47
12 25
UHH-63
14 9
UHH-86
15 31
To determine how water temperatures other than 200°F affect mounting height:
Maximum Mounting Height
Table 2. Mounting Height Correction Factors – Hot Water
140
Water Temp. Drop, (°F)
Correction Factor
1.33
Note:
Factors are for use with entering air temperature ranging from 50°F to 70°F.
To determine how non-standard steam pressures (other than 2 lb.) affect mounting height:
Maximum Mounting Height
Table 3. Mounting Height Correction Factors – Steam
Steam Pressure (PSIG)
Correction Factor
Table 4. Vertical Air Maximum Mounting Height and Spread
No Deflector
Model
Height-Ft./Spread-Ft.
Type
H
S
UDH-42
17
11
UDH-59
13 0
UDH-78
14 
UDH-95
4
16
UDH-139
7
18
UDH-161
21 31
UDH-193
4

UDH-212
7
25
UDH-247
6 9
UDH-279
45
0
UDH-333
45
0
UDH-385
0 45
UDH-500
56
7
UDH-610
54
6
Data shown for standard 2 lb. Steam. 60°F entering air temperature conditions. For louvers or cone-jet, data shown for deflectors in fully-opened position.
1
For mounting height/spread at steam pressure other than  lb., multiply the value by the correction factor in Table .
 For mounting height and spread for hot water, multiply the value above by 1.06 to approximate the mounting height and spread at 200°F entering
water temperature. For entering water temperature other than 200°F, multiply the value above by 1.06 and then multiply the correction factor in Table 2.
Height-Ft./Spread-Ft.
Model
Size H
UHH-108
15
UHH-121
16
UHH-165
17
UHH-193
18
UHH-258
19
UHH-290
0
UHH-340
0
= Maximum Mounting Height
A
150 160 170 180
1.25 1.19 1.13 1.08
= Maximum Mounting Height
A
2 5 10 15
1.00 0.97 0.94 0.9
Cone-Jet Truncone
Height-Ft./Spread-Ft. Height-Ft./Spread-Ft. Height-Ft./Spread-Ft. Height-Ft./Spread-Ft. Height-Ft./Spread-Ft. Height-Ft./Spread-Ft.
H S
H
15 11 8
18 13 9
19 14 11
16 11
21
4 18 13
8 21 14
 16
31
 25 16
4 6 17
18
7 0
7 0 17
6 0 17
44 7 19
4 6 19
S


4
7
40
44
Note: Performance data for standard units at standard conditions of
46 00ºF entering water and 60ºF entering air.
× Correction Factor
S
220
190 200 210
1.04 1.00 0.97 0.94
× Correction Factor
S
20 30 40 50
0.89 0.86 0.84 0.8
1,2
One-Way Louvers
S
S H
19 13 11
25 16 14
6 17 15
6 17 15
 21 18
35  0
25
9 
9 25 
46 0 6
53 35 0
53 35 0
53 35 0
65 4 7
6 41 41
S
230 240 250 260
0.91 0.89 0.86 0.84
60 70 80 90
0.80 0.79 0.77 0.76 0.75
Two-Way Louvers 3-Cone Anemostat
H S
H
8  8
10 8 9
11 0 11
11 0 11
13 6 13
14 40 14
15 16
44
15 44 16
18 52 17
21 18
60
21 60 17
21 60 17
6 19
74
25 7 —
H
270 280 290
300
0.82 0.80 0.78
0.77
100 125 150
175
0.74 0.7
0.71
4-Cone Anemostat
S
S H
8 8

8 8 35
0 8 0
8
0 0
6 9 45
40 10 50
12
44 55
44 12 55
52 13 65
13
60 75
60 13 75
60 13 75
74 13 9
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