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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UL listed, FM approved, CGA and AGA certified, IRI approvable, ISO 9001 certified;
European, Australian and Japanese approved versions available.
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Safety shutoff function, pressure regulating function and air/gas ratio control in one
compact unit.
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Simplifies commissioning and reduces startup time.
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Maintains air/gas ratio when the air flow is disrupted.
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Automatic compensation for combustion chamber back pressure fluctuations.
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No mechanical wear or play that causes drifting.
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Compensation for air temperature fluctuations.
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Visual stroke position indicator.
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Can be mounted in any location.
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Optional auxiliary switches available.
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Excellent tracking characteristics
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SKP70… series actuators can be combined with ½-inch to 5-inch VG… series gas valve
bodies. VG… series gas valves are ordered as separate items (
See
VG…U.. Technical
Instruction No. 155-512P25).
If the combustion air pressure exceeds the permissible value of 12” or 20” w.c. (
See
Specifications), the pressure must be reduced by means of a pressure reducing T-
fitting (
See
Figure 4, AGA78).
A motorized pressure reducing control (SQN37… ) can also be installed in the air
impulse line to continuously optimize combustion when used in conjunction with an
oxygen trim system.
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SKP70.110U17 110-120 Vac No —
SKP70.111U17 110-120 Vac Auxiliary SPDT
SKP70.191U17 110-120 Vac Proof of Closure SPST
SKP70.192U17 110-120 Vac
Proof of Closure
& Auxiliary
SPST
SPST
SKP70.110U27 220-240 Vac No —
SKP70.111U27 220-240 Vac Auxiliary SPDT
SKP70.192U27 220-240 Vac
Proof of Closure
& Auxiliary
SPST
SPST
AGA78
Air pressure reducing T-fitting
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WARNING:
Personal injury/loss of life may occur if a
procedure is not performed as specified.
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