Technical Instructions
Document No. 155-516P25
Rev. 2, December, 1998
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9
Siemens Building Technologies, Inc.
Landis Division
St
St
St
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a
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t
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up
up
up,
,
,
, c
c
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n
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d
d
d....
W
W
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A
A
AR
R
R
RN
N
N
NIIIIN
N
N
NG
G
G
G::::
When firing at maximum burner capacity,
ensure that the SKP70… /VG… is no
no
no
notttt 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.
S
S
S
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e
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errrrvi
vi
vi
vic
c
c
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e
There are no serviceable parts on the SKP70… series actuators. If inoperative, replace the
actuator. Tag wires before servicing.
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Prrrress
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Fitt
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5
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5.
.
.
. A
A
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AG
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A
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A7
7
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78
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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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SK
SK
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SKP
P
P
P7
7
7
70
0
0
0....1
1
1
110
10
10
10U
U
U
U..
..
..
..
SK
SK
SK
SKP
P
P
P7
7
7
70
0
0
0....1
1
1
111
11
11
11U
U
U
U..
..
..
..
SK
SK
SK
SKP
P
P
P7
7
7
70
0
0
0....1
1
1
191
91
91
91U
U
U
U..
..
..
..
SK
SK
SK
SKP
P
P
P7
7
7
70
0
0
0....1
1
1
192
92
92
92U
U
U
U....
.
