MXG461B Series Modulating Control Valve Technical Instructions
with Magnetic Actuator Document Number 125-4461
May 3, 2006
Siemens Building Technologies, Inc. Page 7
Connecting the Z366
Stem Heater
The Z366 includes connectors for the
stem heater.
The stem heater is designed for a
24 Vac power supply.
SVAL0091R1
Figure 13. Z366 Stem Heater.
Specifications
Electrical
Low-voltage use only Class 2 (SELV, PELV)
24 Vac
Operating voltage 24 Vac +15/-10%
Frequency 45 to 65 Hz
Typical power consumption See Table 1 P
med
Standby <1 W (valve fully closed)
Nominal apparent power See Table 1, S
NA
Suitable fuse Slow, see Table 1, I
N
24 Vdc
Operating voltage 20 to 30 Vdc
Functional data, actuator Input
Positioning signal Y 0/2 to 10 Vdc or 0/4 to 20 mA, or
0 to 20 Vdc Phs
Impedance 0/2 to 10Vdc 100K ohm//5nF
0/4 to 20 mA 240 ohm//5nF
Forced control
Impedance 22K ohm
Closing the valve (Z connected to G0) <1 Vac; <0.8 Vdc
Opening the valve (Z connected to G0) >6 Vac; >5 Vdc
No function (Z not wired) Phase-cut or positioning signal Y
active
Output
Position feedback signal voltage 0/2 to 10 Vdc; load resistance > 500Ω
current 0/4 to 20 mA; load resistance
< 500Ω
Stroke measurement Inductive
Nonlinearity
+3% of end value
Functional data, valve Nominal pressure ANSI 125 (PN 16)
Operating pressure p
e
max
1)
232 psi (16 bar)
Pressure differential Δp
v
max
See Table 1
Leakage A → AB Maximum 0.05% C
V
B → AB Depends on application data
(0.2% C
V
)
Water temperature
2)
–4°F to 248°F (–20°C to 120°C)
Valve characteristic
3)
Equal percentage or linear, optimized
near the closing point
Resolution ΔH/H
100 >1 : 1000 (H = Stroke)
Type of operation Modulating
Position when de-energized A → AB closed
Orientation: Upright to horizontal
Positioning time <2 seconds
1. Tested at 1.5 × PN (24 bar), similar to DIN 3230-3
2. For medium temperatures <32°F (0°C), the Z366 stem heating element is required.
3. Can be selected via DIP switch.
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