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SKP70…U.. Air/Gas Ratio Controlling Actuators

Technical Instruction

155-516P25

Rev. 2, December,1998

Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as
design improvements are introduced. © 1998 Siemens Building Technologies.

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Landis Division
1000 Deerfield Parkway
Buffalo Grove, IL  60089-4513
USA

Document No. 155-516P25
Printed in the U.S.A.
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(Dimensions given in inches; millimeters shown in parentheses.)

Summary of Contents for SKP Series

Page 1: ...he combustion air pressure without the need for an additional constant gas pressure regulator Since three functions safety shutoff constant pressure regulation and air gas ratio control can be performed by a single valve fewer components and fittings are required to assemble a gas train reducing both the size and the weight of the gas train significantly The total pressure drop across the gas trai...

Page 2: ... 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 P P P Pr r r ro o o odu du du duc c c ct t t t N N N Nu u u um m m mb b b be e e er r r rs s s s T T T Ta a a ab b b bl l l le e e e 1 1 1 1 P P P Pr r r ro o o od d d du u u uc c c ct t t t N N...

Page 3: ...imensions See Figure 6 Specification for valves See gas valve Technical Instruction No 155 512P25 Connections Conduit connection inch NPSM adapter Gas air combustion chamber pressure connections NPT Operating characteristics Output force 100 lb 450 N Maximum stroke 0 7 18 mm Opening time for maximum stroke 12 s Closing time 0 8 s Control signal Reference input signal Combustion air pressure Contro...

Page 4: ... pressure acts on the regulator causing the air diaphragm to move to the left and close the regulating hydraulic bypass valve When the actuator is powered the gas valve begins to open The downstream differential gas pressure immediately begins to increase until the downstream gas pressure is in balance with the air pressure in accordance with the pressure ratio adjusted on the regulator The bypass...

Page 5: ... SKP70 leakage due to diaphragm rupture stops when the burner shuts off and the valve is closed Conventional regulators continue to leak and therefore have to be vented to the outdoors N N N No o o ot t t te e e e To avoid oscillation do not oversize the VG valve See Technical Instruction No 155 512P25 F F F Fi i i ig g g gu u u ur r r re e e e 1 1 1 1 S S S SK K K KP P P P7 7 7 70 0 0 0 U U U U O...

Page 6: ...c c ce e e e The pressure connection pipes should be as short as possible to allow the regulator to react to sudden changes The connection pipe for the combustion chamber pressure must be installed so that condensing flue gases cannot enter into the regulator but run back into the combustion chamber If necessary a water separator must be installed W W W WA A A AR R R RN N N NI I I IN N N NG G G G ...

Page 7: ...oximately 90 of full capacity 3 Measure CO2 or O2 content in the flue gases and correct the ratio by adjusting screw until optimum values are obtained fine setting 4 Return to low fire and measure the CO2 or O2 content in the flue gases If necessary correct the setting by adjusting screw until optimum values are obtained 5 Limit the damper position for low fire operation If considerable parallel d...

Page 8: ... Fi Fi Fitt tt tt tti i i in n n ng g g g A A A AG G G GA A A A78 78 78 78 F F F Fi i i ig g g gu u u ur r r re e e e 4 4 4 4 A A A AG G G GA A A A7 7 7 78 8 8 8 O O O Op p p pe e e er r r ra a a at t t ti i i io o o on n n n F F F Fi i i ig g g gu u u ur r r re e e e 5 5 5 5 A A A AG G G GA A A A7 7 7 78 8 8 8 A A A Ad d d dj j j ju u u us s s st t t tm m m me e e en n n nt t t ts s s s Function ...

Page 9: ... d di ii ing ng ng ng T T T Te e e ec c c chn hn hn hno o o ol ll log og og ogi ii ie e e es s s s I I I In n n nc c c c Landis Division 1000 Deerfield Parkway Buffalo Grove IL 60089 4513 USA Document No 155 516P25 Printed in the U S A P P P Pa a a age ge ge ge 9 9 9 9 o o o of f f f 9 9 9 9 D D D Di i i im m m me e e en n n ns s s si i i io o o on n n ns s s s F F F Fi i i ig g g gu u u ur r r re...

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