Technical Instructions
Document No. 155-516P25
Rev. 2, December, 1998
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9 Siemens Building Technologies, Inc.
Landis Division
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When firing at maximum burner capacity,
ensure that the SKP70… /VG… is no
nono
not
tt
t in the
fully open position. If this is the case, either the
gas valve is sized too small or the gas supply
pressure is too low.
Auxiliary and Proof of
Closure Switch (
See
Terminal Designations)
Adjust the auxiliary switch (if provided) according to the wiring diagram located on the
inside of the terminal box cover. The proof of closure switch is non-adjustable.
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There are no serviceable parts on the SKP70… series actuators. If inoperative, replace the
actuator. Tag wires before servicing.
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Function The air is blown out continuously into the atmosphere through the restrictor D
2
. The air
undergoes a drop in pressure across the restrictor D
1
. The relationships are shown in the
diagram (Figure 5).
Example: Given p
1
= 70 mbar, D
1
= 1.5 mm, D
2
= 1.7 mm
Find: Pressure signal P
2
for SKP70…
P
2
= 26 mbar
Reducing T-fitting AGA78 is supplied ready for mounting, complete with D
1
= 1.5 mm and
D
2
= 1.7 mm. An additional restrictor D
2
with a diameter of 2 mm is included in the
packing.
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