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Technical Instructions SKPx5.xxxUx Electro Ͳ hydraulic actuators
Document Number CC1N7643us
December 10, 2018
Page 8 Siemens AG Building Technologies
Specifications
Continued
Operation /
installation
Outlet pressure spring range 0" to 8.5" w.c.
(standard, unpainted spring, AGA29)
SKP25.xxxUx
for SKP25.0xxUx models 6" to 48" w.c. (yellow spring, AGA22)
40" to 100" w.c. (red spring, AGA23)
for SKP25.411U1 models 1.5 to 10 psi (standard, yellow spring, AGA22)
8.5 to 20 psi (red spring, AGA23)
With air pressure loading in SKP25.0xxUx models ± 0.4" w.c. bias (black spring AGA28)
With zero governor in SKP25.611U1 0.4" to – 4" w.c. bias
Maximum sensing line pressure / leakage test
pressure
20 psi
Maximum sensing line vacuum 3 psi
Minimum sensing line diameter 1/4" inside diameter
Minimum distance between sensing line and gas
valve outlet
5 times the pipe diameter (could be less if proven
with application)
Minimum time required for high to low fire load
changes
4 seconds (depending on valve stroke)
SKP55.xxxUx Differential pressure ratio 1:1
Permissible pressure differences during operation
for accurate control
Gas: minimum 0.1" w.c.
Gas: maximum 80" w.c.
Air: minimum 0.1" w.c.
Air: maximum 80" w.c.
Low fire bias range Ͳ 0.4 to 0.4" w.c.
Minimum distance of impulse pipe connections 3 pipe diameters before and 5 pipe diameters after
any valve, damper, elbow, coupling, or flow
disruption
SKP75.xxxUx Setting range of gas to air pressure ratio Pg / Pa from 0.4:1 to 9:1
Permissible pressures:
Min. air pressure for accurate control 0.2" w.c. (Pa Ͳ Pc)
Max. air pressure: with setting Pg/Pa <2 20" w.c. (Pa Ͳ Pc)
Max. air pressure: with setting Pg/Pa >2 12" w.c. (Pa Ͳ Pc)
(with higher air pressures use AGA78)
Min. downstream gas pressure for accurate control 0.4" w.c. (Pa Ͳ Pc or Pg Ͳ Pa)
Max. downstream gas pressure 40" w.c. at any Pg/Pa setting during operation
Minimum distance between gas sensing line and
gas valve outlet (SKP75.xxxUx)
5 times the pipe diameter
)
NOTE:
When the combustion chamber pressure Pc is connected, the above pressures should be
considered pressure differentials Pg Ͳ Pc and Pa Ͳ Pc.