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Honeywell S8921D Скачать руководство пользователя страница 1

Copyright © 1998 Honeywell Inc. • All Rights Reserved

X-XX UL

INSTALLATION INSTRUCTIONS

S8921D

Hot Surface Ignition Module

APPLICATION

The S8921D Hot Surface Ignition Module controls the
operation of an LP or natural gas fired direct ignition
heating appliance that includes a combustion air blower
and an air proving switch. The S8921D ignites the main
burner with a 120 Vac hot surface igniter (Norton 271 or
equivalent). A flame rectification safety circuit monitors
the main flame through a remote flame sense rod. The
system provides up to five trials for ignition before
lockout if the appliance fails to light or loses flame during
the heating cycle. An automatic recycle feature initiates a
new ignition trial if the call for heat remains for one hour
after lockout due to failure to light.

Because it has a special operating sequence that limits
the time that the combustion air blower is energized
when the appliance is not delivering heat, the S8921D is
well suited for agricultural and other applications where
cold air flow into the heated space is highly undesirable.

SPECIFICATIONS

Electrical Ratings:

Control Voltage: 24V, 60 Hz.

Valve Contact Rating: 2A.
Current Draw: .4A plus valve load.

Line Voltage: 120 Vac, 60 Hz.

Contact Rating at 120 Vac.
Hot Surface Igniter: 5A.
Combustion Air Blower: 3 FLA, 10 LRA.

IMPORTANT:

The S8921D is to be used only in a 60 Hz
system. Be sure the system is not 50 Hz.

Hot Surface Igniter:
Norton Model 271 or equivalent.

NOTE:

If an igniter other than a Norton Model 271 is
used, the igniter must meet the following
minimum specifications required over the life of
the igniter:
—

Igniter must reach 1832

°

F (1000

°

C) within

17 seconds with 102 Vac applied.

—

Igniter must maintain at least 500M ohm
insulation resistance between the igniter
leadwires and the igniter mounting bracket.

—

Igniter must not develop an insulating layer
on its surface (over time) that would
prevent flame sensing.

—

Igniter surface area immersed in flame
must not exceed one-fourth of the
grounded area immersed in flame. This
would prevent flame sensing.

—

Igniter current draw at 132 Vac must not
exceed 5A.

Flame Sensor:
Separate sensor required.

Air Proving Switch:
SPNO air proving switch required.

Prepurge:
0 seconds.

Igniter Warmup:
17 seconds (first trial).
27 seconds (second through fifth trials).

Ignition Trial:
7 seconds.

Ignition Activation Period:
4 seconds.

Between Trial Delay:
0 seconds.

Flame Failure Response Time:
Less than 0.8 second at 1 uA flame signal.

Flame Current:
0.8 uA dc minimum.

Ambient Operating Temperature:
-40

°

F to +175

°

F (-40

°

C to +79

°

C).

Approvals:
International Approval Services (IAS) Design Certified:

Report No. C2030018.

69-0924-2

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Содержание S8921D

Страница 1: ... 60 Hz Contact Rating at 120 Vac Hot Surface Igniter 5A Combustion Air Blower 3 FLA 10 LRA IMPORTANT The S8921D is to be used only in a 60 Hz system Be sure the system is not 50 Hz Hot Surface Igniter Norton Model 271 or equivalent NOTE If an igniter other than a Norton Model 271 is used the igniter must meet the following minimum specifications required over the life of the igniter Igniter must r...

Страница 2: ...A 4 enclosure is recommended for the ignition module see the Electronic Ignition Service manual 70 6604 Corrosive Chemicals Corrosive chemicals can attack the module and gas control eventually causing a failure If chemicals are used for routine cleaning avoid contact with the controls Where chemicals are suspended in air as in some industrial or agricultural applications NEMA 4 enclosure is recom ...

Страница 3: ...ly before doing any work on the unit Disconnect and tag the wires from the old module Label each wire as it is removed Remove the old module from its mounting location Mount New Ignition Module Mount the new module in the same location as the old module Protect the module from exposure to water moisture corrosive chemicals and excessive dust and grease Make certain that the ambient temperature at ...

Страница 4: ...ormer has adequate VA The ignition module requires 0 4A at 24 Vac Add the current draws of all other devices in the control circuit including the pilot and main valves in the gas control and multiply by 24 to determine the total VA requirement of these components Add this total to 9 6 VA for the ignition module The result is the minimum transformer VA rating Use a Class II trans former when replac...

Страница 5: ... gas control is energized 5 Gas control is energized for the trial for ignition time This time can be measured by connecting a voltmeter range set to measure approximately 24 Vac across the gas valve terminals 6 After the trial for ignition the between trial delay begins and the combustion air blower is turned off 7 The second trial begins with the hot surface igniter warmup followed by the combus...

Страница 6: ...nition The gas control opens for the ignition trial time The hot surface igniter stays powered for the ignition activation period and then the igniter turns off Near the end of the ignition trial time the flame rectification sensing circuit determines if the main burner flame is present If so the gas control remains open and the burner operation phase begins Burner Operation When the main burner i...

Страница 7: ...onsiderations are Cycling frequency Appliances that may cycle 20 000 times annually should be checked monthly Intermittent use Appliances that are used seasonally should be checked before shutdown and again before the next use Consequence of unexpected shutdown Where the cost of an unexpected shutdown would be high the system should be checked more often Dusty wet or corrosive environment Since th...

Страница 8: ... of module Re establish call for heat Check for 24 Vac across VALVE and VALVE GND terminals during trial for ignition Note Voltage present only during trial for ignition after air proving switch confims combustion air flow Replace module Check replace wiring to gas control Check replace gas control Note Ignition module will continue ignition cycle to lockout after 5 trials for ignition Troubleshoo...

Страница 9: ...em Checks Step 1 Check wiring harness Make sure 1 Connections to the ignition module air proving switch and gas control are clean and tight 2 Hot surface ignition cable provides good electrical continuity Step 2 Check ignition system grounding Nuisance shutdowns are often caused by a poor or erratic ground A common ground is required for the module flame sensor and main burner 1 Check for good met...

Страница 10: ...69 0924 2 10 S8921D HOT SURFACE IGNITION MODULE ...

Страница 11: ...69 0924 2 11 S8921D HOT SURFACE IGNITION MODULE ...

Страница 12: ...ted Honeywell Limitée 155 Gordon Baker Road North York Ontario M2H 3N7 69 0924 2 J S Rev 6 98 Home and Building Control Honeywell Inc Honeywell Plaza P O Box 524 Minneapolis MN 55408 0524 www honeywell com Printed in U S A on recycled paper containing at least 10 post consumer paper fibers ...

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