Hot Water Sizing Method For Honeywell Mixing Valve Selection - Honeywell MX Serie Manual Del Usuario

Hot Water Sizing Method For Honeywell Mixing Valve Selection

1. Determine Fixture Units – Table 2
2. Using Total Fixture Units determine load in Gpm from Table 3.
3. Select product based on minimum flow requirement and allowable pressure drop (20 Psi).
Fixture Units
Fixture Private Public
Lavatory
Kitchen Sink
Bathtub
Separate Shower
Clothes Washer
Dish Washer
EXAMPLE: A system with 40 Lavatory (Private), 40 Bathtubs (private) and 5 Lavatory (public) has total fixture count of
130 fixture units. From Table 3 - 130 fixture unit = 38 Gpm
Fixture Units Gpm
2
6
10
14
20
24
30
34 16.5
40 18.5
45
50
Table 4. Single High Capacity MX Series Mixing Valve Selection Chart
Min Flow
Product GPM
MX127LF 1
MX128LF 2.5
MX129LF 3.5
MX130LF 5
MX131LF 8
MX132LF 12
This sizing method is a general guideline. Please refer to local building and plumbing codes for additional guidance.
Table 2. Fixture Unit Worksheet.
# of Fixtures (multiply by) Fixture Units Equals
1 2
2 4
2 4
2 4
2 4
1 2
Table 3. Domestic Hot Water Demand – Load Data.
Fixture Units
2 55
4.5 60
6.5 70
8.5 80
11 90
13 100
15 130
160
200
20 260
21 300
Outlet Size
Inch 5
1" 9
1¼" 21
1½" 30
2" 40
2½" 76
3" 112
Fixture Unit Calculation
x
x
x
x
x
x
Gpm
23
24
27
29
31
33
38
43
49
58
64
System Differential Pressure Drop (PSI)
10 15
13 15
29 36
43 52
57 70
108 132
158 194
5
MX SERIES VALVES
Total
=
=
=
=
=
=
Total
Fixture Units Gpm
350 72
400 78
450 86
500 93
550 100
600 107
650 115
700 122
750 130
800 134.5
1000 156
20 25
18 20
42 47
60 68
80 90
152 170
224 250
38-00035EFS—01
30
22
51
74
99
186
274