Schwank supraSchwank - 40 SERIES Installation instructions

SP-MSU4-CX-09D
Supra/Primo - 40 Manual
RD: FEB 2009
RL: 9E
BA
SCHWANK GAS FIRED
INFRARED HEATERS
supraSchwank – 40
primoSchwank – 40
SERIES
HIGH EFFICIENCY
COMBINED INTENSITY
INSTALLATION /
OWNER’S
MANUAL
FOR YOUR SAFETY
If you smell gas:
1) Open windows
2) Don’t touch electrical switches
3) Extinguish any open flame
Immediately call your gas supplier
FOR YOUR SAFETY:
Do not store or use gasoline or other flam-
mable vapours and liquids in the vicinity
of this or any other appliance.
If you smell Gas:
>Extinguish any open flames
>Don’t touch electrical switches
>Call your Gas supplier immediately
FIELD CONVERTIBILITY:
“The conversion shall be carried out in ac-
cordance with the requirements of the
authorities having jurisdiction and in
accordance with the requirements of the
B149.1-00 ( latest edition)
INSTALLATION CODE” in Canada, and
the ANSI Z223.1 (latest edition) in the U.S.A.

SP-MSU4-CX-09D
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RD: FEB 2009
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NOTICE:
Schwank Inc., reserves the right to make
changes to equipment and specifications
without obligation or notification.
All codes are current at the time of printing.
This publication, or parts thereof, may not be re-
produced in any form, without prior written
consent from Schwank Inc. Unauthorized
use or distribution of this publication
is strictly prohibited.
Schwank Group
5285 Bradco Boulevard
Mississauga, Ontario,
L4W 2A6
phone: [phone]
fax: [phone]
PO Box 988
Waynesboro,
Georgia,USA 30830
Phone: [phone]
Technical Support: 1-877-446-3727
Fax: [phone]
e-mail: [email protected]
http://www.schwankgroup.com

SP-MSU4-CX-09D
Supra/Primo - 40 Manual
RD: FEB 2009
RL: 9E
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1. GENERAL ..................................................................1
2. INSTALLATION REQUIREMENTS ........................1
2.1 INSTALLATION IN AIRCRAFT HANGARS....1
2.2 INSTALLATION IN COMMERCIAL
GARAGES.............................................................2
2.3 INSTALLATIONS OTHER THAN SPACE
HEATING..............................................................2
2.4 MOUNTING CLEARANCES ..............................2
2.5 HEATER MOUNTING.........................................2
2.6 VENTILATION REQUIREMENTS.....................3
2.7 GAS PRESSURE...................................................3
2.8 ELECTRICAL REQUIREMENTS &
THERMOSTATION CONTROL..........................4
3. INSTALLATION PROCEDURES .............................4
4. LIGHTING INSTRUCTIONS ....................................5
5. SHUT DOWN INSTRUCTIONS................................5
6. AIR BORNE PARTICLES..........................................5
7. SERVICE GUIDE.......................................................5
8. SPECIFICATIONS AND DIMENSIONS..................6
8.1 DIMENSION DIAGRAM.....................................6
8.2 MOUNTING HARDWARE .................................6
8.3 HORIZONTAL MOUNTING DIAGRAM...........7
8.4 SUGGESTED MOUNTING DISTANCE FOR
COMFORT............................................................7
8.5 HORIZONTAL MOUNTING DISTANCE TO
COMBUSTIBLES.................................................8
8.6ANGLE MOUNTING DISTANCE TO
COMBUSTIBLES.................................................8
9. HIGH ALTITUDE INSTALLATIONS....................10
10. SEQUENCE OF OPERATION FOR S87C .............10
10.1 ELECTRICAL WIRING DIAGRAM .............11
10.2 ELECTRICAL WIRING DIAGRAM USA ....12
10.3 TROUBLESHOOTING GUIDE .....................13
11. SPARK IGNITION CIRCUIT..................................16
12. START UP SHEET..................................................17
13. OPTIONAL COMPONENTS ..................................19
14. LIMITED WARRANTY..........................................23
TOPIC PAGE NUMBER TOPIC PAGE NUMBER
supraSchwank – 40
primoSchwank – 40
HIGH EFFICIENCY COMBINED INTENSITY
GAS FIRED INFRA-RED HEATERS
TABLE OF CONTENTS

SP-MSU4-CX-09D
Supra/Primo - 40 Manual
RD: FEB 2009
RL: 9E
BA

SP-MSU4-CX-09D
Supra/Primo - 40 Manual
RD: FEB 2009
RL: 9E
BA
Page 1
The Schwank gas fired infra-red combined
intensity heaters are suitable to be installed
for heating of non-residential indoor or out-
door spaces. Installation of the supra-
Schwank / primoSchwank heaters must
conform to all Schwank heating installation
design procedures including ventilation. All
installations in Canada must conform to local
and national code requirements including the
current CSA-B149.1 installation code for gas
burning appliances and equipment, and Cana-
dian Electrical Code part 1 CSA C22.1 latest
edition must be observed. All installations in
the U.S.A. must conform to local and na-
tional code requirements including, National
Fuel Gas code ANSI Z223.1 and the National
Electrical Code ANSI/NFPA No 70 Due to
ever changing standards and requirements,
revision to our equipment and installation
procedures may be necessary. In case of dis-
crepancies, the latest installation manual will
take priority. It is beyond the scope of these
instructions to embrace all conditions.
All system piping must be supported in
accordance with acceptable practice, local
codes, and all applicable standards. (latest
edition).
1. GENERAL
2. INSTALLATION REQUIREMENTS
The Schwank Combined Intensity Heaters
are suitable for use in aircraft hangars when
installed in accordance with the following.
A. A minimum clearance of 10 ft above
either the highest fuel storage compart-
ment or the highest engine enclosure of
the highest aircraft which may occupy the
hangar. The clearance to the bottom of the
heater shall be measured from the upper
surface of either the fuel storage compart-
ment or the engine enclosure, whichever
is higher from the floor.
B. A minimum clearance of 8 ft must be
maintained from the bottom of the heater
in other sections of the aircraft hangars,
such as offices and shops, which commu-
nicate with areas for servicing or storage.
Refer to sections 8.3 and 8.5 for proper
mounting clearances to combustibles.
C. Heaters must be located so as to be pro-
tected from damage by aircraft and other
objects, such as cranes and movable scaf-
folding.
D. Heaters must be located so as to be acces-
sible for servicing and adjustment.
2.1 INSTALLATION IN AIRCRAFT HANGARS
GAS FIRED INFRA-RED
SUPRASCHWANK/PRIMOSCHWANK 40
INSTALLATION INSTRUCTIONS

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Page 2
2.3 INSTALLATIONS OTHER THAN SPACE HEATING
Use for process applications will void the
C.S.A. certification and require governing
authority field certification at the installer’s /
owner’s responsibility and expense.
2.4 MOUNTING CLEARANCES
2.5 HEATER MOUNTING
The primoSchwank / supraSchwank Com-
bined Intensity Heater must be mounted with
minimum clearances as shown in sections 8.3
and 8.5. It should also be located with
WARNING: The Schwank Combined Intensity Heaters cannot be in-
stalled inside degreasing plants, nor can they be in an area
where chlorine, fluorine or bromine are present.
The Schwank Combined Intensity Heaters are
approved for both horizontal and angle
mounting. When angle mounting, the short
axis may be rotated to a maximum of 30 de-
grees. The Venturi alignment varies with NG
and LPG applications. Therefore it is very im-
IMPORTANT:
For either horizontal or angle mounting, the long axis of the heater body
must be level. Use only non-combustible mounting hardware. Diagrams 2
on page 6 illustrate typical suspension hardware that is approved.
respect to building construction and equip-
ment so as to provide sufficient clearance
and accessibility for servicing and cleaning
of burners and ignition control.
important, and critical to install the heaters
with the venturi positioned as per the manu-
facturers instructions. Improper angle
mounting can result in damage to the heater
or unsafe operation.
2.2 INSTALLATION IN COMMERCIAL GARAGES
The Schwank Combined Intensity Heaters
are suitable for use in commercial garages
when installed in accordance with ANSI/
NFPA No. 88B 1985 (latest edition), which
states clearances to combustible construction
or material in storage, from heater and vent,
must conform to standard NFPA No. 54
(ANSI Z223.1 latest edition), in
the U.S.A. and the CSA B149, and
CAN1.2.16-M81 in Canada. “Overhead
heaters shall be installed at least (8) feet
above the floor”. In addition, they shall be
located high enough to maintain the mini-
mum distance to combustibles, as shown on
the heater rating plate, between the heater
and any vehicles parked below the heater

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Page 3
The maximum supply pressure must be lim-
ited to 14" W.C. (0.5 psi). If the line pressure
is above 14" W.C., then a separate pressure
reducing regulator must be used. The mini-
mum pressure at the inlet to the heater regula-
tor must be equal to or greater than 6.0” w.c.
for NG and 11.0" w.c. for LPG. A sealed
regulator is supplied with the heater which
maintains the proper manifold pressure when
the main burner is operating under the fol-
lowing pressure:
A. All piping must be installed according to
local codes.
B. It is recommended to install an approved
flexible connector between the heater and
gas piping available as option from
Schwank.
C. A drip-pocket at the inlet connection must
D. On propane-fired units, a main line filter
is recommended.
E. Piping joint compounds must be resistant
to the action of liquefied petroleum gases.
F. All piping joints should be tested for
leaks with a soap and water solution.
CAUTION: Do not install any gas piping in heat zones. Do not subject heater
controls to leak test pressures when checking the main supply
piping.
2.7 GAS PRESSURE
LINE PRESSURE (inches w.c.) MANIFOLD PRESSURE (inches w.c)
AT TAP IN GAS VALVE
MINIMUM MAXIMUM
NATURAL GAS 6.0 14.0 5.0
PROPANE GAS 11.0 14.0 10.0
Natural gas models are orificed for 1000 BTU/CU FT., and propane gas models are orificed for
2500 BTU/CU FT.
2.6 VENTILATION REQUIREMENTS
In Canada it is required by law that an un-
vented heater be electrically interlocked to an
independent exhaust fan by means of an Air
Proving Switch. The exhaust fan must be
sized to create 3 Cfm for every 1000 Btu/hr
or fraction thereof, of total input of installed
equipment. Consult CSA.B149.1-00 latest
edition for requirements. In the USA when a
heater is installed unvented the system re
quires the exhausting of at least 4 Cfm per
1000 Btuh/hr on NG, and 4.5 Cfm per 1000
Btu/hr for LP. By natural or mechanical
means, or electrically interlocked to an in-
dependent exhaust fan, for the total input of
all heaters installed. Exhaust openings for
removing flue products shall be above the
level of the heaters.. Consult your local
codes and ANSI Z223.1 latest edition.

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Page 4
3. INSTALLATION PROCEDURES
A. Properly install gas line as outlined in
section 2.7, on page 3.
B. Properly connect the ignition control as-
semblies to the heater.
C. Mount heaters by using non-combustible
mounting hardware as illustrated in Dia-
grams 2 & 3 on page 7. Observe the mini-
mum clearances as outlined in sections
8.3 and 8.7.
D. Connect heater to the main gas line. It is
recommended to use a 1/2" flexible con-
nector to absorb gas line expansion and
any building vibration (available as
option from Schwank Inc.)
E. Mount thermostat at desired location,
away from direct infra-red rays of heater
and not on cold wall without sufficient
insulation backing. Install exhaust fan, air
switch and transformer, as per section
2.6, page 3 and section 2.9, page 4.
F. Check gas line for leakage by using soap
test or gas meter test. Ensure gas pressure
meets the requirements outlined in sec-
tion 2.8, page 3.
WARNING: When testing the main gas line pressure, ensure the gas shut-off
valve supplying the heater is “OFF”, otherwise damage to the
combination gas valve will result.
G. Ensure proper electrical rating in the sys-
tem by checking voltage at ignition mod-
ule terminals. To avoid system malfunc-
tion, the voltage range must be within
21.6 volts to 26.4 volts.
H. Test fire the heating system by follow-
ing the lighting instructions as shown
on the next page and on heater.
2.8 ELECTRICAL REQUIREMENTS AND THERMOSTAT CONTROL
All electrical installations must meet local
and Canadian Electrical Code Part CSA
C22.1. Single heater requires 24 Volt, 60 Hz
electrical transformer sized at 40 VA. If mul-
tiple heaters are connected to a single trans-
former, the proper transformer is 24 Volt,
60 Hz, sized at 20 VA per heater. For exam-
ple, five heaters wired together (parallel), re-
quire a transformer of 100 VA.
It is not recommended to install more than 12
heaters per zone. PROPER WIRING PO-
LARITY MUST BE MAINTAINED, par-
ticularly when grouping the heaters in a zone.
Total wiring distances of up to 200' must use
minimum 16 gauge electrical wire, and wir-
ing distances of over 200' must use minimum
14 gauge electrical wire. The heater must be
electrically grounded in accordance with the
electrical code.
The heater can be controlled by a line voltage
thermostat, a black bulb sensor with control
or “off-on” switch. Total load of all heaters
must be considered in determining the re-
quired contact rating of the controlling ther-
mostat or switch.

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Page 5
4. LIGHTING INSTRUCTIONS
A. Open the isolation valve in the main gas
line. Turn gas control knob on the combi-
nation gas valve, to the “ON” position.
B. Switch on electrical circuit by turning the
thermostat to the highest temperature set-
ting.
C. The heater should attempt ignition and
remain lit within thirty seconds. Note that
the corresponding exhaust fan is operat-
ing properly.
D. If ignition does not occur, then cut off
electrical power by turning the thermostat
to off position.
WARNING:
A. Turn off electrical circuit for temporary
shutdown.
Under certain conditions, heater may discolour
due to ambient air borne particle deposits on the
outside surface of the delta chamber. These de-
posits in no way affect the operation of the
heater nor the manufacturer’s warranties.
5. SHUT DOWN INSTRUCTIONS
If heater back-fires during operation, then it must be turned off
immediately.
Indication of back-firing:
A. Loud ignition noise, then followed by dis-
tinct hissing sound.
B. Little or no visible burning on the ceramic
tile.
C. Combustion is taking place inside the
burner body.
Cause & remedy of back-firing:
A. Improper gas pressure entering the ven-
turi tube: - check pressure.
B. Breakage of a ceramic tile and or gasket-
ing: - replace damaged part.
C. Faulty sealing of the ceramic tile to the
burner body, caused by breakdown of
gasketing material: - contact your
Schwank distributor.
6. AIR BORNE PARTICLES
7. SERVICING GUIDE
Servicing of heater is essential for continued
efficient operation, servicing should be car-
ried out annually by qualified service person-
nel.
A. Clean the ceramic tile with compressed
air, avoid directing air stream at the gasket
material between tile and heater body.
Air pressure must be lower than 20psi.
B. Clean the venturi tubes with compressed
air.
C. Clean the reflectors.
B. Turn off the electrical circuit and turn
gas control knob to the “OFF” position

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8.0 SPECIFICATIONS AND DIMENSIONS FOR 40KW COMBINED INTENSITY
HEATERS
TABLE 1: SPECIFICATIONS
Page 6
8.2 MOUNTING HARDWARE
DIAGRAM 2: SUSPENSION HARDWARE (supplied by others)
MODEL VOLTAGE
VAC
CURRENT
AMPS
CAPACITY (BTU/HOUR)
BTUH
INPUT BTUH IR OUTPUT
supraSchwank 40 24 0.55 118,000
109,000 95,600 88,500 120
primoSchwank 40 24 0.55 150,000
137,000 101,600 89,200 79
TOTAL
WEIGHT
Lbs.
GAS
TYPE
NG
LPG
NG
LPG
8.1 DIMENSION DIAGRAM

SP-MSU4-CX-09D
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** These mounting distances are suggested and are subject to on sight conditions. If in doubt,
please contact your Schwank distributor.
8.3 HORIZONTAL MOUNTING DIAGRAM FOR COMBINED INTENSITY HEATERS
DIAGRAM 4:
Page 7
B
A
Z
SIDE VIEW CEILING
Y
8.4 SUGGESTED MOUNTING DISTANCES FOR COMFORT*
C
MODEL BOTTOM
<B>
FRONT
<A>
MAXIMUM
DISTANCE
BETWEEN
HEATERS
<Y>
MAXIMUM
DISTANCE
BETWEEN
ROWS
<Z>
primoSchwank- 40
supraSchwank-40
26’-32’
28’-34’
32”
34”
22-40’
22-40’
130’
130’

SP-MSU4-CX-09D
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8.5 HORIZONTAL - MOUNTING DISTANCE TO COMBUSTIBLES
TABLE 5: MINIMUM CLEARANCE TO COMBUSTIBLES APPROVED BY CSA,
MEASURED FROM EDGE OF BURNER
MODEL FRONT OF
HEATER
< A >
BOTTOM OF
HEATER
<B>
ENDS OF
HEATER
<C>
REAR OF
HEATER
<D>
TOP OF
HEATER
<E>
primoSchwank -40 45” 110” 48” 45” 26”
supraSchwank- 40 40” 110” 48” 40” 20”
Page 8
B
E
A
B
A
E
MODEL FRONT OF
HEATER
< A >
BOTTOM OF
HEATER
<B>
ENDS OF
HEATER
<C>
REAR OF
HEATER
<D>
TOP OF
HEATER
<E>
primoSchwank -40 78” 36” 48” 8” 48”
supraSchwank- 40 78” 36” 48” 8” 48”
8.6 ANGLE - MOUNTING DISTANCE TO COMBUSTIBLES
TABLE 5: MINIMUM CLEARANCE TO COMBUSTIBLES APPROVED BY CSA,
MEASURED FROM EDGE OF BURNER
D
A
C C
NOTE: See page 9, “Aeration Plate
Installation”

SP-MSU4-CX-09D
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RD: FEB 2009
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ForAngle mounting Only : (Aeration Plate not required for horizontal mounting)
install the Aeration Restrictor Plate supplied, onto the Lower Orifice Holder. Slide
plate inside and down over the orifice and locate the V across the bottom of the
spoke. Push the top of the plate in toward the orifice holder locking it in place us-
ing the small dimple located at the top of the plate. take care to angle the plate
during installation to avoid damaging the orifice face.
ORIFICE HOLDER ORIFICE
SUPRA / PRIMO-40 AERATION RESTRICTOR PLATE
Upper
Orifice
Holder
Lower
Orifice
Holder
AERATION RESTRICTOR PLATE
(FOR ANGLE MOUNTING 40 SERIES ONLY)
AERATION PLATE IS
REQUIRED ON THE
LOWER VENTURI
ONLY.
ANGLE MOUNTED
Page 9

SP-MSU4-CX-09D
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RD: FEB 2009
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10. SEQUENCE OF OPERATION FOR HONEYWELL S87C DSI CONTROL
1. On A call for heat the S87C DSI Control
will check for a false flame condition /
short to ground. The module will lock out
if a false flame condition is present.
(Reset is usually done from the Thermo-
stat manually).
2. Spark (30,000 volts) is generated at the
Spark Ignition Stud, for direct ignition
of the main Burner by the single Spark
Igniter.
3. Main Gas Control Valve is powered and
OPENS lighting off the Main Burner.
4. Separate Flame Sensor, relays the pres
ence of Main Burner flame back to the
DSI Control by a rectified dc voltage
signal. (TFI period)
5. If this dc signal is a minimum of 1.5 uA
(microamps) the flame remains estab-
lished and the DSI Control discontinues
the ignition spark.
6. This is the 21 second T.F.I (Trial For Ig-
nition) period where flame has to be es-
tablished first, and confirmed with a mini-
mum signal strength of 1.5 microamps
back to the DSI Control. Failing this the
DSI will go into the Safety Lockout Mode
and shut down the Burner. (Reset is
manually done from the Thermostat).
7. On a loss of power the S87 allows the sys-
tem to shut down safely. Start up is initi-
ated when power is restored
8. On a loss of Main Burner flame, the
timed T.F.I. is repeated.
Safety Lock-out occurs if the flame is
not re-established within the T.F.I
period, (Reset is manually done from
the Thermostat.)
Page 10
9. HIGH ALTITUDE INSTALLATIONS
In Canada all of our Luminous heaters are
approved for altitudes zero to 2000 ft above
sea level, or 2000 ft to 4500 ft above sea level
and must be ordered as such, for either High
or Low altitude.
In the USA if a heater is to be installed at alti-
tudes above 2000 ft, the input must be re-
duced by 4% per 1000 ft and the orifice must
be changed. (Contact your local distributor or
Schwank for further technical information).

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10.1 WIRING DIAGRAM - LUMINOUS HEATERS - 24V THERMOSTAT CONTROL
See 120V Thermostat Control on next page
DIAGRAM 11:
Page 11

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10.2 WIRING DIAGRAM - LUMINOUS HEATERS - 24V THERMOSTAT CONTROL
See 24V Thermostat Control on previous page
DIAGRAM 12:
Page 12

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cont’d
10.3 TROUBLESHOOTING GUIDE
SET THERMOSTAT TO CALL FOR HEAT
IS THE HEATER BURNING? THE SYSTEM IS WORKING PROPERLY..STOP
YES
NO
IS THERE LINE VOLTAGE TO
THE THERMOSTAT CONTROL?
→CHECK CIRCUIT BREAKERS OR FUSE
→CHECK ON/OFF SWITCH
→CHECK NIGHT TIME SET BACK CONTROL
NO
IS THERE VOLTAGE TO THE
EXHAUST FAN SYSTEM?
YES
YES
→CHECK ELECTRICAL CONNECTION FROM
THERMOSTAT TO FAN MOTOR
→CHECK THERMOSTAT, REPLACE IF
NECESSARY
NO
IS EXHAUST FAN MOTOR
OPERATING?
→CHECK EXHAUST FAN MOTOR, REPLACE
IF NECESSARY
NO
IS THERE VOLTAGE TO THE
TRANSFORMER?
YES
→CHECK ELECTRICAL CONNECTION
TO TRANSFORMER
→CHECK LINE VOLTAGE TO PRIMARY
SIDE OF TRANSFORMER
YES
NO
IS THERE VOLTAGE FROM TRANS-
FORMER TO AIR-PROVING SWITCH?
→CHECK ELECTRICAL CONNECTION FROM
TRANSFORMER TO AIR SWITCH
→CHECK TRANSFORMER, REPLACE IF
NECESSARY
NO
YES
cont’d
Page 13

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IS THERE VOLTAGE FROM AIR-
PROVING SWITCH TO IGNITION
CONTROL MODULE?
→CHECK ELECTRICAL CONNECTION FROM A I R
SWITCH TO IGNITION CONTROL MODULES
→ENSURE LOW VOLTAGE WIRES ARE
PROPERLY INSTALLED, WIRING POLARITY
IS CRITICAL
→CHECK THAT THE VA RATING ON THE
TRANSFORMER IS CORRECT.
→ENSURE AIR HOSE IS CONNECTED
PROPERLY FROM A I R S W I T C H T O
EXHAUST FAN
→CHECK AIR SWITCH, REPLACE IF
NECESSARY
YES
NO
IS THERE A SPARK AT SPARK
IGNITER?
→ENSURE THE IGNITER GAP IS 1/4" WIDE (6MM)
→ENSURE THE FLAME SENSOR IS WITHIN 1/4"
TO 1/8" ABOVE CERAMIC TILE
→CHECK SPARK IGNITER CE RAMIC FOR CRACK,
REPLACE SPARK IGNITER IF NECESSARY
→CHECK HI-VOLTAGE LEAD C O N N E C T I O N
FROM SPARK IGNITER TO IGNITION MODULE
→ENSURE HIGH VOLTAGE SPARK IS
GENERATED ON THE IGNITION CONTROL
TERMINAL BY FOLLOWING THE STEPS AS
SHOWN BELOW:
WARNING:
THIS TERMINAL CARRIES 15,000 AC VOLTS.
BEFORE REMOVING THE HIGH VOLTAGE LEAD
THE ELECTRICAL POWER TO THE SYSTEM
MUST BE SHUT OFF OR ELECTRICAL SHOCK
WILL RESULT.
SHUT OFF ELECTRICAL POWER, AND REMOVE
THE HI-VOLTAGE LEAD FROM THE TERMINAL
ON THE IGNITION CONTROL MODULE.
TURN ON ELECTRICAL POWER
PLACE A METAL CONDUCTOR 1/8" AWAY
FROM THE HI-VOLTAGE TERMINALS
WARNING: THE HANDLE ON THE METAL
CONDUCTOR MUST BE HEAVILY INSULATED.
A LONG SCREW DRIVER WITH THICK PLASTIC
INSULATION HANDLE IS IDEAL FOR THIS
APPLICATION.
IF NO SPARKING OCCURS ACROSS THE GAP
TO THE METAL CONDUCTOR, THEN THE
IGNITION CONTROL IS DEFECTIVE. SHUT OFF
ELECTRICAL POWER AND REPLACE WITH NEW
IGNITION CONTROL. RECONNECT THE HIGH
VOLTAGE LEAD.
YES
NO
cont’d
Page 14

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IS THERE VOLTAGE FROM IGNITION
CONTROL TO COMBINATION GAS
VALVE?
→CHECK ELECTRICAL WIRES FROM IGNITION
CONTROL TO COMBINATION GAS VALVE
→CHECK IGNITION CONTROL, REPLACE IF
NECESSARY
NO
IS GAS COMING THROUGH
ORIFICE ON THE HEATER?
YES
→ENSURE ALL GAS VALVES ARE OPEN
NO
YES
DOES THE IGNITION CONTROL
TERMINATE THE SPARKING
PROCESS AFTER THE HEATER IS
OPERATING?
→CHECK SPARK IGNITER FOR CRACKS,
REPLACE SPARK IGNITER IF NECESSARY
→ENSURE THE SENSING WIRE IS SECURELY
CONNECTED TO THE SENSING PROBE
→CLEAN THE SENSING PROBE ON THE SPARK
IGNITER
→ENSURE THE FLAME SENSOR IS WITHIN 1/4"
ABOVE THE CERAMIC TILE
→CHECK FLAME SIGNAL WITH METER, IF LOW
CHANGE SENSOR
→REPLACE WITH NEW IGNITION CONTROL
UNIT IF OTHER CHECKS ARE OK
DOES HEATER SHUT DOWN
AFTER IGNITION CEASES?
→CHECK FLAME SIGNAL USING A METER
INSTALLED IN SERIES WITH SENSOR CABLE,
CHECK (MICROAMPS) STRENGTH OF SIGNAL
FOR 1.5uA MINIMUM
YES
YES
NO
NO
STILL HAVING TROUBLE
OPERATING THE HEATER?
→REPEAT THE ABOVE TROUBLE SHOOTING
PROCEDURES
→IF THE PROBLEM PERSISTS, CONTACT YOUR
SCHWANK DISTRIBUTOR.
YES
NO
TROUBLESHOOTING
COMPLETE
→IF SIGNAL IS LOW REPLACE SENSOR AND
WIRE
Page 15

SP-MSU4-CX-09D
Supra/Primo - 40 Manual
RD: FEB 2009
RL: 9E
BA
11. SPARK IGNITION CIRCUIT
The step-up transformer in the ignition control provides spark ignition at 30,000 volts (open
circuit). To check the spark ignition circuit, proceed as follows.
1 Shut off gas supply to the gas control
2 Disconnect the ignition cable at the ignition control stud terminal to isolate the circuit from
the spark igniter or igniter/sensor
3 Prepare a short jumper lead, using heavily insulated wire such as ignition cable
CAUTION
In the next step, DO NOT allow fingers to touch either the stripped
end of the jumper or the stud terminal. This is a very high voltage circuit and
electrical shock can result.
1 Perform this test immediately upon energizing the system before the ignition control goes
into safety lockout and interrupts the spark circuit. Touch one end of the jumper firmly to
the ignition control GND terminal. (DO NOT remove the existing ground lead.) Slowly
move the other end of the jumper wire toward the stud terminal on the ignition control to
establish a spark.
2 Pull the wire away from the stud and note the length of gap at which spark discontinues.
3 A spark length of 1/8 in. (3mm) or more indicates satisfactory voltage output. If no arc can
be established, or the maximum spark is less than 1/8 in. (3mm), and power to the ignition
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