Daikin AVV Installation And Maintenance Manual page 27

2-Way Modulating Valve (Steam) - 3/4"
The modulating control valves for MicroTech are designed
to regulate the flow of steam. They consist of a nickel
plated brass body and stainless steel ball valve and stem,
with a spring return, proportional actuator. The optional
valve accessory is shipped separate from the unit ventilator
for field installation to prevent shipping damage and to
provide flexibility in making the field piping connection.
Figure 74: 2-Way Modulating Valve (Steam) Dimensions
D
E F
Table 22: 2-Way Modulating Valve 3/4" – Dimensions
Valve Part No . Cv
B220HT731 7.31
Table 23: 2-Way Modulating Steam Valve 3/4" – Pressure Drop
Cv
2-Way CCV Part Connection
Maximum
No .
Rating
B220HT731 7.31
www.DaikinApplied.com
B
A
Connection Size
A
(inches)
3/4 inch 8.70" (221mm)
2 PSI 3 PSI
Size
3/4 inch 110.02 137.27
Table 20: Actuator Specifications
Power Supply
Electrical Connection
Overload Protection
Input Impedance
Feedback Output U
Angle of Rotation
Position Indication
Running Time (Motor)
Running Time (Fail-Safe)
Ambient Temperature Range
Storage Temperature Range
Table 21: Valve Body Specifications
Service
Flow Characteristic
Controllable Flow Range
Body Pressure Rating [psi]
Max Inlet Pressure (Steam)
Media Temperature Range
(Water)
C
Media Temperature Range
(Steam)
Maximum Differential Pressure
(Steam)
Max Differential Pressure
(Water)
Close-Off Pressure
B C
3.96" (101mm) 6.74" (171mm)
Pressure Drop Across the Valve
4 PSI 5 PSI
161.36 183.54
27
24 VAC ± 20%, 50/60 Hz, 24 VDC ± 10%
3ft [1m], 18 GA plenum cable with 1/2"
conduit connector
electronic throughout 0° to 95° rotation
100 k Ω for 2 to 10 VDC (0.1 mA), 500 Ω
for 4 to 20 mA
2 to 10 VDC (max 0.7 mA) for 95°
90°
visual indicator, 0° to 95° (0° is full spring
return position)
150 sec constant, independent of load
<25 sec @ -4°F to 122°F [-20°C to 50°C], <
60 sec @ -22°F [-30°C]"
-22°F to 122°F [-30°C to 50°C]
-40°F to 176°F [-40°C to 80°C]
high temperature hot water/low pressure
steam, up to 60% glycol
A-port equal percentage
75°
600
15 psi
60°F to 266°F [16°C to 130°C]
250°F [120°C]
15 psi
60 psi partially open ball, 116 psi full open
200 psi
D E
6.07" (154mm) 1.89" (48mm)
10 PSI 15 PSI
280.70 367.86
F
1.89" (48mm)
IM 817-7