Schwank SET - SETU Owner's Manual

Two stage low intensity tube type infrared heaters
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Model
SET - SETU
LOW INTENSITY TUBE TYPE INFRARED HEATERS
INSTALLATION / OWNER'S MANUAL
WARNING
SAFETY ALERT:
This heater must be installed and serviced only by a trained gas service techni-
cian. Failure to comply could result in personal injury, death, fire and/or property
damage.
Do not store or use gasoline or other flammable vapours and liquids in the
vicinity of this or any other gas fired appliance.
IF YOU SMELL GAS:

Extinguish any open flame
Do not attempt to light this or any other appliance

Don't touch any electrical switch, or telephone

Immediately call your gas supplier from a neighbor's phone

Follow any and all instruction from your gas supplier

If your gas supplier is not available, call the fire department

FIELD CONVERTIBILITY:
This appliance is field con-
vertible to LP gas.
&
TWO STAGE
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, injury or death.
Read the installation and operating and maintenance instruc-
tions thoroughly before installing or servicing this equipment.
Keep this manual in a secure place .
Record for future reference:
Model #:
Serial #:
(located on heater rating label)
Model
ITT - ITTU
SET(U)-F / ITT(U)-F Manual
IM091221
RD: FEB 2014
RL: 8B

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Summary of Contents for Schwank SET - SETU

  • Page 1 Model Model SET - SETU ITT - ITTU & TWO STAGE LOW INTENSITY TUBE TYPE INFRARED HEATERS INSTALLATION / OWNER’S MANUAL Improper installation, adjustment, alteration, service or WARNING maintenance can cause property damage, injury or death. Read the installation and operating and maintenance instruc- tions thoroughly before installing or servicing this equipment.
  • Page 2 The Manufacturer. Unauthorized use or distribution of this publication is strictly prohibited. Schwank Group Schwank and InfraSave brands 5285 Bradco Boulevard Mississauga, Ontario,L4W 2A6 PO Box 988, 2 Schwank Way Waynesboro, Georgia 30830 Customer & Technical Services Phone: 877-446-3727 Fax: 866-361-0523 e-mail: csr@schwankgroup.com www.schwankgroup.com...
  • Page 3: Table Of Contents

    SET / SETU and ITT / ITTU SERIES GAS FIRED INFRARED LOW INTENSITY TUBE TYPE TABLE OF CONTENTS TOPIC ..PAGE TOPIC ……...PAGE 14. ELECTRICAL AND THERMOSTAT....30 IMPORTANT INFORMATION - READ FIRST 15. HIGH ALTITUDE INSTALLATION ....30 APPLICATION ..........4 16.
  • Page 4: Application

    WARNING Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or death. Read and understand this installation and op- eration manual thoroughly prior to assembly, installation, operation or service to this appliance. This heater must be installed and serviced only by a trained gas service techni- cian.
  • Page 5: Heater Expansion

    WARNING Heater Expansion It is a normal condition that during heat-up and cool-down a tube heater will expand and contract. Allowances for heater expansion must be made in the gas connection, venting and combustion air ducting. Improper installation, alteration, or adjustment can result in property damage, injury or death.
  • Page 6: Tube 'Glow

    WARNING Tube “GLOW” It is a normal condition that the combustion tube (1st tube) can appear to “glow red”. For inputs up to 150,000 Btuh, the top surface of the tube can appear red where heat is trapped between the reflector and the tube. The stainless steel tube used for inputs 175,000 and greater can ap- pear to entirely glow red.
  • Page 7: Clearances Figure & Table

    FIGURE 1 MINIMUM CLEARANCES TO COMBUSTIBLES* - refer to Table 1 for values NOTE: A ‘PEEL & STICK’ SIGN IS SUPPLIED: USE AN INDELIBLE MARKER TO ENTER VALUES ‘H’, ‘S’, ‘F’, & ‘B’ ON . POST THE SIGN ADJACENT TO THE HEATER THERMOSTAT OR IN A See next page for details.
  • Page 8: Stacking Height Sign

    tolerance which may degrade at lower temperatures are protected to prevent degrada- tion. Examples of low heat tolerance materials include vinyl siding, fabrics, some plas- tics, filmy materials, etc. VENT END CLEARANCE: Clearances from the vent pipe are determined by local or national installation codes, but must not be less than 6 inches (15 cm).
  • Page 9: Labor Requirements

    1. LABOR REQUIRMENTS Two persons are required to safely install this equipment. Wear gloves and other required safety protection. INSTALLATION IN COMMERCIAL AIRCRAFT HANGARS Low intensity radiant tube heaters are suitable for use in aircraft hangars when installed in ac- cordance with the latest edition of the Standard for Aircraft Hangars, ANSI/NFPA No 409 in the USA, or the Canadian Natural Gas and Propane Installation Code, B149.1.
  • Page 10: Pre-Installation Survey

    WARNING Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or death. Read and understand this installation and operation manual thoroughly prior to assembly, installation, operation or service to this appliance. This heater must be installed and serviced only by a trained gas service technician. Do not store or use gasoline or other flammable vapours and liquids in the vicinity of this or any other gas fired appliance.
  • Page 11: Mounting Clearances

    6. MOUNTING CLEARANCES This heater must be mounted with at least the minimum clearances between the heater and combustibles as shown in FIG-1, TABLE 1, Page 7. It is the installer’s responsibility to ensure that building materials with a low heat tolerance which may degrade at lower temperatures are protected to prevent degradation.
  • Page 12: Heater Placement Guidelines

    TABLE 2: GUIDELINES FOR HEATER PLACEMENT DISTANCE – OUTSIDE WALL MAXIMUM TO HEATER LONG AXIS MODEL DISTANCE (PARALLEL TO WALL) IN “FEET” MOUNTING BETWEEN “Straight” or HORIZONTAL HEIGHT HEATERS ANGLE “U-Tube” ft (m) ft (m) ft (m) SET / ITT 200/140 18 –...
  • Page 13: Elbow Kit Dimensions

    90° elbows (JS-0528-SM) are shipped as a kit with one coupler, and two reflector end caps. The SET / ITT is available in a “U-Tube” model - SETU / ITTU - using a 180° turn box. A double wide reflector covers the double tube run. Alternately, for a 180° elbow, order 2 x 90° kits that connect to create a 180°.
  • Page 14: Suspending The System

    8. SUSPENDING THE SYSTEM - GENERAL Inadequate or improper suspension of the tube heater can result in collapse of the system, property damage, and personal injury or death. It is the installer’s responsibility to ensure that the hardware and structural sup- ports from which the heater is suspended are sound and of adequate strength to support the weight and expansion forces of the heater.
  • Page 15: Straight Tube System

    9 INSTALLATION OF HANGERS, TUBES AND BURNER TURBULATOR NOTES: 1. 200,000 x 60 ft & 70 ft: REMOVE SHORT PIECE OF TURBULATOR FROM UP- STREAM END OF LAST TUBE PRIOR TO INSTALLATION OF TUBE 2. Turbulators are ALWAYS installed at the vent end of the heater. SET / ITT STRAIGHT TUBE SYSTEM ~ BURNER AND TUBE INSTALLATION 1) Install Hangers:...
  • Page 16 FIGURE 7: STRAIGHT TUBE TYPICAL HANGER & SUPPORT SPACINGS 6” MIN. to 24” MAX. SUSPEND ALL TUBES BY TWO (2) HANGERS PER 10’ LENGTH, LOCATE HANGERS BETWEEN 6” to 24” FROM EACH TUBE CONNECTION. 1ST & 2ND TUBES FROM BURNER END: INSTALL WELDED SEAM FACING DOWNWARD. 1 - END CAP 4B - JS-0532-VC 4”...
  • Page 17: U' Tube System

    SETU / ITTU ‘U’-TUBE SYSTEM ~ BURNER AND TUBE INSTALLATION TURBULATOR NOTES: Turbulators are ALWAYS installed at the vent end of the heater. 200,000 x 60 FT & 70 FT: REMOVE 4 ft TURBULATOR PIECE FROM UPSTREAM END OF LAST TUBE PRIOR TO INSTALLATION OF TUBE 1) Install Hangers using chain or other suitable suspension hardware at each side of the hanger: See Figure 11 next page i: Two hangers for first section (from burner), and one hanger for each additional section...
  • Page 18 FIGURE 11 ‘U’-TUBE TYPICAL HANGER & SUPPORT SPACING SUSPEND FIRST TUBES BY TWO (2) HANGERS, THEN SUBSEQUENT SECTIONS BY ONE HANGER LOCATE HANGERTS BETWEEN 6” to 18” FROM EACH TUBE COUPLER. INSTALL FIRST AND SECOND TUBES (FROM BURNER END) WITH WELDED SEAM FACING DOWNWARD. 1 - END CAP 4B - JS-0532-VC 4”...
  • Page 19: Special Coupling - 175 & 200 Mbh

    9.3 SPECIAL COUPLING: 175,000 & 200,000 Btuh NOTE: The joint of 1ST & 2ND tubes of 175,000 & 200,000 heaters experience strong forces of expansion. Follow instructions below for special coupling of the tubes. SPECIAL COUPLER INSTALLATION Note the 2 holes opposite each other at the swaged end of the first tube (flanged) Install the first tube with 2 holes (swaged end) at the 3 and 9 o’clock position, with the welded seam located in the lower half of tube, facing downward Slide the loosened tube coupler on to the first tube, past the swage...
  • Page 20: Reflector Installation

    10. REFLECTOR INSTALLATION NOTE: Ensure that you are installing a single reflector - reflectors can ‘stick together’ in packaging - take care to separate them. SET / ITT - STRAIGHT TUBE : After burner and tubes have been installed, slide the re- flectors one at a time into the wire hangers.
  • Page 21 FIGURE 15 REFLECTOR EXTENSIONS (OPTIONAL - IF REQUIRED ) Reflector Extension Kit JS-0509-KT Includes:  Qty 1 x 10 ft long x 10 inch deep reflector extension  Qty 3 x “S” Hooks Reflector extensions may be installed one or both sides 1.
  • Page 22: Flue Venting

    WARNING 11. FLUE VENTING Inadequate venting of a heater may result in asphyxiation, carbon monoxide poisoning, injury or death. This heater may use a vent connection or indirect venting system to remove products of combustion from the space. Seal all vent connections with high temperature sealant.
  • Page 23 heaters must be controlled by a single common thermostat or “ON/OFF” switch.  Install a minimum 36 inch (91 cm) length of minimum 26 gauge single walled 4” (10 cm) di- ameter vent pipe on the system, and a minimum 12 inch (30 cm) before any Tee or Elbow. ...
  • Page 24  Use approved 4" (10 cm) (JA-0528-XX) or 6" (15 cm) (JA-0529-XX) horizontal wall vent ter- minal or a high-wind termination cap approved by a recognized certification agency  Install termination cap a minimum of 18 inches (45 cm) from the outside wall to the inside edge of terminal opening to alleviate back pressure caused by turbulent wind conditions (See Fig.
  • Page 25: Combustion Air Duct

    FIGURE 19 ERTICAL VENT THROUGH THE ROOF It is the sole responsibility of the installer to ad- Approved here to all current local codes and/or ANSI 24” Z223.1 / CSA.B149.1 latest editions for all vent- 60 cm ing requirements, and practices. Approved ...
  • Page 26 12. COMBUSTION AIR DUCTING Do not install filters on the combustion air intake. Ensure adequate clearance around the air intake to allow sufficient combustion air supply to the heater. This heater requires optional 4” Fresh Air Intake Adapter JS-0532-SE to connect an out- side combustion air duct.
  • Page 27: Gas Supply

    GAS SUPPLY - HEATER EXPANSION - FLEXIBLE GAS CONNECTION The gas supply must be installed to the heater using:  USA: an approved Stainless Steel Flexible Gas Connector certified for use on an infrared radiant tube heater (ANSI Z21.24 CSA 6.10); ...
  • Page 28: Heater Expansion

    NOTE: Access to the manifold pressure test port is on the top of the valve. A 3/16" Allen Wrench is necessary to check this. When checking or setting the manifold pressure, a water manometer should be used. Gauges which measure in ounces per square inch or pounds per square inch are not accurate enough to properly measure or set the pressure.
  • Page 29 FIGURE 20 ORIENTATION OF FLEXIBLE GAS CONNECTOR The flexible gas connector MUST be installed in the orientation shown below as required by national installation codes and by the certification standard of this heater. This orientation protects the flexible gas connector from damage due to movement during heater expansion.
  • Page 30: Electrical And Thermostat

    145VA. The heater includes a 24V/120V relay switch and is to be controlled by a Honeywell FocusPRO 5000 Series TH5220D1037 (or equivalent) 24V Digital Thermostat - Schwank/ InfraSave P/N JS-0569-DT. Maximum power flow for internal 24V burner components is 21VA.
  • Page 31: Wiring Diagram Fenwal Dsi

    18. WIRING DIAGRAM FENWAL DSI (HONEYWELL S87J - PAGE 52) 24 VOLT TWO STAGE GAS VALVE – USING 24V TWO STAGE THERMOSTAT (FOR MULTIPLE HEATERS PER THERMOSTAT SEE NEXT PAGE) SET(U)-F / ITT(U)-F Manual IM091221 RD: FEB 2014 RL: 8B...
  • Page 32: Wiring Diagram Multiple Heaters Per 2-Stage Thermostat

    19. WIRING DIAGRAM - MULTIPLE 2-STAGE HEATERS PER 2-STAGE THERMOSTAT (FOR SINGLE HEATER PER THERMOSTAT SEE PREVIOUS PAGE) (previous page) Maximum Power Flow = 21VA SET(U)-F / ITT(U)-F Manual IM091221 RD: FEB 2014 RL: 8B...
  • Page 33: Fenwal Dsi: Sequence Of Operation

    20. FENWAL DSI: SEQUENCE OF OPERATION / FLAME RECOVERY / SAFETY LOCKOUT Power Up / Stand By Upon applying 24 volts power to 24VAC, the control will reset, perform a self check routine, initi- ate full time flame sensing, flash the diagnostic LED for up to four seconds, and enter the ther- mostat scan state.
  • Page 34 Flame Fault If at any time the main valve fails to close completely and maintains a flame, the full time flame sense circuit will detect it and energize the combustion blower. Should the main valve later close completely removing the flame signal, the combustion blower will power off following the optional post purge period.
  • Page 35: Spark Igniter Adjustment

    SPARK IGNITER ADJUSTMENT Use the following diagram to check the Igniter gap. If the gap is incorrect all adjustments should be made to the GROUND PRONG/PIN ONLY! DO NOT BEND THE IGNITER PRONG!!!! USE THE BLACK BARS BELOW AS A GUIDE FOR AD- JUSTMENT.
  • Page 36: Troubleshooting Guide: Fenwal Dsi

    21. TROUBLESHOOTING GUIDE - FENWAL DSI (also see Heater Troubleshooting next page) SYMPTOM RECOMMENDED ACTION(S) A. Miswired - check electrical supply (120Vac ± 5%) B. Transformer bad (24Vac ± 10%) 1. Dead C. Fuse/Circuit breaker bad D. Bad control (check LED for steady on) A.
  • Page 37: Troubleshooting Guide: Heater

    22. TROUBLESHOOTING GUIDE - HEATER OPERATION WARNING Improper adjustment, alteration, service or maintenance can cause property damage, injury or death. This heater must be SEQUENCE OF EVENTS (also see DSI Troubleshooting previous page)  REMEDY 120 VOLTS SUPPLY FAULT APPLY 120 VOLTS SET THERMOSTAT TO CALL FOR HEAT ...
  • Page 38 MAIN BURNER LIGHTS  CHECK FOR STRONG SPARK AT IGNITER.. (SEE PREVIOUS PAGE).  CHECK FOR 24 VAC ACROSS GAS VALVE.  CHECK OUTPUT VOLTAGE FROM CONTROL TER- MINALS TO GAS VALVE..IF NO VOLTAGE RE- PLACE CONTROL.  CHECK ELECTRICAL WIRING, AND VOLTAGE BE- TWEEN IGNITION CONTROL AND GAS VALVE.
  • Page 39: Start- Up / Commissioning Sheet

    23. START-UP / COMMISSIONING SHEET THIS EQUIPMENT HAS BEEN FACTORY FIRED AND TESTED PRIOR TO SHIPMENT. HOWEVER, THIS APPLIANCE IS NOT “PLUG & PLAY”. IT RE- QUIRES COMMISSIONING AND FIELD ADJUSTMENT / SPECIFICATIONS CONFIRMATION TO ENSURE SAFE AND EFFICIENT OPERATION. COMMISSIONING REPORT AS PER I&O MANUAL AND LOCAL CODES CONTRACTOR NAME: ................DATE........
  • Page 40 QUALIFIED INSTALLER TO COMPLETE THIS TUBE HEATER COMMISSIONING REPORT TYPE OF GAS: DOES BUILDING HAVE A NEGATIVE CONDITION: IF THIS IS A HIGH ALTITUDE AREA WHAT IS THE ALTITUDE ABOVE SEA LEVEL Feet DOES APPLICATION REQUIRE FRESH AIR TO BURNER IS HEATER EXPOSED TO CHEMICAL OR CORROSIVE ATMOSPHERE: ARE ACTUAL MINIMUM CLEARANCES AS PER TABLE 3 CAN HEATER BE AFFECTED BY OVERHEAD CRANES / VIBRATION...
  • Page 41: Heater Dimensions / Weights

    24. BTUH INPUT RATINGS AND CORRESPONDING DIMENSIONS OVERALL APPROX OVERALL APPROX HIGH-FIRE HIGH-FIRE NOMINAL NOMINAL HEATER HEATER INPUT INPUT LENGTH LENGTH LENGTH* WEIGHT** LENGTH* WEIGHT** (FT) (FT) BTUH BTUH (FT) (LBS) (FT) (LBS) 200,000 110,000 40’ 8” 200,000 50’ 4” 110,000 175,000 100,000...
  • Page 42: Installation Dimensions

    FIGURE 21 BURNER DIMENSIONS FIGURE 22 HANGER SPACING / LENGTH - AIR INTAKE TO VENT END  POSITION BURNER END HANGER 4 INCHES (10 CM) FROM BURNER  LOCATE SYSTEM HANGERS NO LESS THAN 6 INCHES (15 CM) AND NO MORE THAN 24 INCHES (61 CM) FROM TUBE COUPLING * ANGLE BURNER SUPPORT CHAIN BACK OVER BURNER - ALLOWS TUBE SYSTEM EXPANSION Tube...
  • Page 43: Straight Tube System

    25A. BURNER & TUBE KIT ASSEMBLY CHART MODELS SET / ITT MODELS SET & ITT are approved for indoor commercial / industrial non-residential applica- tions. For outdoor, wet and harsh environment applications refer to models SPW-JZ / IWP (powder coated burner box) and/or STW-JZ / IW (stainless steel burner box). BEFORE INSTALLING: ENSURE you have the CORRECT TUBE KIT(s) for the BURNER INPUT 'SET / ITT' TUBE KIT PART # &...
  • Page 44: U' Tube System

    25B. BURNER & TUBE KIT ASSEMBLY CHART MODELS S100U / ITBU MODELS S100U & ITBU are approved for indoor commercial / industrial non-residential appli- cations. For outdoor, wet and harsh environment applications refer to models SPW-JZ / IWP (powder coated burner box) and/or STW-JZ / IW (stainless steel burner box). BEFORE INSTALLING: ENSURE you have the CORRECT TUBE KIT(s) for the BURNER INPUT SETU / ITTU TUBE KIT PART # &...
  • Page 45: Turbulators

    TURBULATORS: NOTE: Improper location of a turbulator can cause malfunction of the heater, property damage, and will void the heater warranty. Tube Heaters are supplied with all required turbulator(s) factory installed into the tube(s). Tubes with turbulators are installed at the vent end of the system configuration and are clearly labeled for easy identification.
  • Page 46 27. HIGH ALTITUDE INSTALLATION continued ORIFICE CHART - ALTITUDE CONVERSION ~ SEE NOTES ON PREVIOUS PAGE ~ FOR USE AT ALTITUDES ABOVE (FEET) Gas Orifice Drill Size / Part# MODEL USA Only USA & CANADA* Supplied 2000 3000 4000 5000 6000 7000 8000...
  • Page 47: Optional Accessories

    28. OPTIONAL ACCESSORIES JL-0800-XX #2 Lion Chain (115 lb work load) - 200 ft roll ‘S’ Hooks - 1 7/8” - package of 25 JL-0798-SH Flue Vent Terminal 4” wall horizontal JA-0528-XX 6” wall horizontal JA-0529-XX Torctite Coupler Sufficient quantity supplied with heater JA-0516-SW Use for connection of vent tee, or...
  • Page 48 Fresh Air Intake Adapter JS-0532-SE Fresh Air Intake Cap—Wall JS-0532-VC Fresh Air Intake Cap—Roof JA-0530-XX 4” roof cap JA-0531-XX 6” roof cap 2-Stage Low Voltage Digital Thermostat (24 Volts - °F or °C selectable) JS-0569-DT Not for use in corrosive or wet environments Required For MULTIPLE HEATERS per Thermostat: 24 RELAY...
  • Page 49 JS-0508-SM 90 degree Aluminized Steel Elbow (Kit includes: aluminized steel elbow, coupler, and two reflector end caps) For 180° elbow use two x JS-0508-SM, or use Model SETU / ITTU that includes 180° Turn Box Side Reflector Extension Kit- l0” deep, l0 ft long Each JS-0509-KT Includes 3 ‘S’...
  • Page 50: Burner Parts List

    29. REPLACEMENT PARTS SET / ITT Burner PART DESCRIPTION PART # PART DESCRIPTION PRIMARY SUPPLEMENT Burner housing (painted orange) JS-0582-XX BURNER HOUSING P.V.C. tubing set (2 x 20") JS-0572-SE PRESSURE SWITCH TUBING Burner head (45-80) JS-0510-LP 60-80 BURNER HEAD Burner head (110-200) JS-0512-XX 110-200 Burner head air rest.
  • Page 51 PART DESCRIPTION PART # PART DESCRIPTION PRIMARY SUPPLEMENT blower ring c/w 1 1/2" bird screen JS-0595-AC 80/60, 110/80 AIR INLET C/W SCREEN 155/110 NG/LP, 130/90 NG blower ring c/w 1 3/4" bird screen JS-0595-EP blower ring c/w 2" bird screen JS-0595-AE 175/200 NG blower ring c/w 2 1/8"...
  • Page 52: Tube System Parts List

    SET / ITT & SETU / ITTU TUBE SYSTEM PARTS PART DESCRIPTION PART # PART DESCRIPTION PRIMARY SUPPLEMENT 24 WIRE HANGER JS-0505-EH Small wire hanger 25 REFLECTOR JS-0502-EM Reflector (18" x 120") 26 END CAP JS-0502-ES S100 / ITB series reflector end cap 27 LOW INTENSITY TUBE JS-0501-SW-P Aluminized tube,flanged,swaged c/w ports 60-155...
  • Page 53: Dsi Control Addendum: Previous Models Honeywell S87J Dsi

    HONEYWELL S87J WIRING DIAGRAM - 24 VAC 2-STAGE THERMOSTAT (FENWAL DSI - PAGE 31; MULTIPLE HEATERS PER THERMOSTAT - PAGE 32) (CHANNEL MICRO 50N DSI - PAGES 56-58) Maximum Power Flow = 21VA The heater must be electrically grounded in accordance with the National Electrical Code. ANSI / NFPA 70 or current Canadian Electrical code CSA C22.1.
  • Page 54 HONEYWELL S87J SEQUENCE OF OPERATION The S87 ignition control module is powered by a 24v transformer and activated when the ther- mostat calls for heat. On every call for heat the S87J will delay start-up to provide a 30 second system pre-purge.
  • Page 55 HONEYWELL S87J FLAME SENSING CIRCUIT The output of the flame sensing circuit cannot be checked directly on the S87 body. Check the flame sensing circuit directly by checking the flame sensing current from the sensor to the S87 as follows. 1.
  • Page 56: Channel Micro 50N Dsi

    CHANNEL MICRO 50N: WIRING DIAGRAM: 2-STAGE THERMOSTAT CONTROL OTHER DSI’s: FENWAL SEE PAGE 31; HONEYWELL S87J - PAGES 53- 55 The heater must be electrically grounded in accordance with the National Electrical Code. ANSI / NFPA 70 or current Canadian Electrical code CSA C22.1. SET(U)-F / ITT(U)-F Manual IM091221 RD: FEB 2014...
  • Page 57 CHANNEL MICRO 50N DSI: SEQUENCE OF OPERATION The MICRO 50N is a three trial ignition control module with a 30 minute soft lockout/reset. It is powered through a safety control circuit by a 24v transformer that is activated when the thermo- stat calls for heat.
  • Page 58 CHANNEL MICRO 50N IGNITION CONTROL - SPECS The MICRO 50N is a microprocessor-based DSI (Direct Spark Ignition) control which continu- ously monitors the entire system to ensure safe operation under all conditions. Features of the MICRO 50N DSI Control include 30 second purge and 20 second ignition trial, with three ignition attempts, a diagnostic alarm output, automatic recycle on lockout (soft lock- out).
  • Page 59 Warranty is only applicable to Schwank components, other parts are limited to their own Manufacturers warranty period of one year (1 year).

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