Brochure

Data Sheet ESBE VTA Series Lead Free Thermostatic Mixing Valves
4
VDKIS322 © Danfoss 07/2016
Domestic Hot
Water Sizing:
Flow Capacity:
The ow rate through the VTA series
valve at any given pressure drop can be
determined from the capacity diagram.
For domestic hot water systems the VTA series
can be sized based on the number of xture
units the valve will supply.
Process in selecting the appropriate valve:
1. Determine the type and number of xtures
to be supplied by the mixing valve.
2. Assign xture units from Table 1 for each
xture type.
3. Add the total number of xture units.
4. Conrm the mixing valve has sucient
capacity.
Example:
A residential home with 2-1/2
baths (3 bathroom sinks and 2 baths), kitchen (1
kitchen sink and a dish washer), and a clothes
washer. Hot water supply from the water heater
is ¾”.
The total xture units is (3x1) + (2x2) + (1x2) +
(1x1) + (1x2) = 12 xture units.
Table 1. Fixture Units
Bathroom sink 1
Kitchen Sink 2
Bath 2
Shower 2
Clothes Washer 2
Dish Washer 1
VTA Series Capacity
Size Fixture Units
All except 1” NPT 16
1” NPT 30
Note: certain xtures such as
hot tubs, roman tubs or spa
showers may require a high
volume of hot water. The VTA
series may not be capable of
providing sucient hot water
to these xtures.
Flow vs. Pressure Drop for
VTA Series of Valves
Flow Pattern:
Supply
(Hydronic)
Mixed
Return
(Hydronic)
Cold
(DHW)
Hot
(DHW)
The VTA series provides a mixing ow pattern
for both a domestic hot water (DHW) application
and for hydronic heating systems. If a diverting
ow pattern is required refer to the VTA572 Data
Sheet located on www.na.heating.danfoss.com
(Code No.: 31700200).
1” NPT Cv 4.1
All others
Cv 1.9