Daikin AVV - Page 27

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