Reznor VCT Installation, Operation And Maintenance Manual
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Reznor VCT Installation, Operation And Maintenance Manual

Gas-fired radiant heater
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GAS-FIRED RADIANT HEATER INSTALLATION, OPERATION,
AND MAINTENANCE
• Failure to follow safety warnings exactly could result in serious injury, death, or property
damage.
• Improper installation, adjustment, alteration, service, or maintenance can cause serious injury,
death, or property damage.
• Installation and service must be performed by a qualified installer, service agency, or the gas
supplier.
• Be sure to read and understand the installation, operation, and service instructions in this
manual.
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Leave the building immediately.
• Immediately call your gas supplier from a phone remote from the building. Follow the gas
supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
DO NOT DESTROY. PLEASE READ CAREFULLY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
Revision: VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0
MODELS VCS, VCT, VPS, AND VPT
 ⚠ DANGER ⚠ 
FIRE OR EXPLOSION HAZARD
WHAT TO DO IF YOU SMELL GAS
Supersedes: — (Original Version)

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  • Page 1 Revision: VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0 Supersedes: — (Original Version) GAS-FIRED RADIANT HEATER INSTALLATION, OPERATION, AND MAINTENANCE MODELS VCS, VCT, VPS, AND VPT  ⚠ DANGER ⚠  FIRE OR EXPLOSION HAZARD • Failure to follow safety warnings exactly could result in serious injury, death, or property damage.

  • Page 2: Table Of Contents

    INSTALLATION RECORD (TO BE COMPLETED BY INSTALLER)........44 VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 3: General Information

    CAUTION: A caution statement describes a potentially hazardous situation that if not avoided, can result in minor or moderate personal injury and/or property damage . NOTE: A note provides important information that should not be ignored . VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 4: Warranty

    • These heaters are approved for use in the United States and Canada by the Canadian Standards Association (CSA) . Models VCS and VCT are designed for outdoor or non-residential indoor spaces . Models VPS and VPT are designed for non-residential indoor spaces . Standard heaters are approved for installation elevations of 0–2,000 feet (0–610 meters) for the US and 0–4,500 feet (0–1,370 meters) for Canada .

  • Page 5: Installation Codes

    300 grade stainless steel . Care should be taken to separate these vapors from the combustion process . This may be done by wise location of the unit with regard to exhausters or prevailing wind directions . VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 6: Dimensions

    82 (209) @ 15° 78 (199) @ 25° 170, 200 86 (219) 48 (122) 71 (181) @ 35° 11 (28) 48 (122) 20 (51) 61 (155) @ 45° 50 (127) @ 55° With end caps installed . VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...
  • Page 7 END VIEW (ANGLED INSTALLATION) ABOVE ABOVE BURNER BURNER ABOVE ABOVE REFLECTOR OUTLET UNVENTED SERVICE SERVICE DISTANCE DISTANCE SIDE VIEW SIDE UNVENTED UNVENTED OUTLET END VIEW (L-TUBE HEATER) RETURN END VIEW (U-TUBE HEATER) Figure 2. Clearances (Refer to Table VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 8: Weights

    3 (natural gas units only) 4 (propane units only) 060, 080, 100 — — 100, 125 — 2 (propane units only) — 4 (natural gas units only) — 060, 080, 100, 125 — — — On natural gas units only . VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...
  • Page 9 Figure 3. Tube Arrangements VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...
  • Page 10 Codes for U-tubes, L-tubes, and 5-foot straight tubes are as follows: U-tube = VPU, L-tube = VPL, and 5-foot straight tube = VPH . NOTE: When the system has a U- or L-tube, refer to Table 6 to determine if a turbulator and/or burner insert is required . VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...
  • Page 11 Codes for U-tubes, L-tubes, and 5-foot straight tubes are as follows: U-tube = VPU, L-tube = VPL, and 5-foot straight tube = VPH . NOTE: When the system has a U- or L-tube, refer to Table 6 to determine if a turbulator and/or burner insert is required . VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...
  • Page 12 Codes for U-tubes, L-tubes, and 5-foot straight tubes are as follows: U-tube = VPU, L-tube = VPL, and 5-foot straight tube = VPH . Table 6 NOTE: When the system has a U- or L-tube, refer to to determine if a turbulator and/or burner insert is required . VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...
  • Page 13 Figure 4. Assembly Overview—S20 and S30 VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...
  • Page 14 SYSTEM CONFIGURATIONS—CONTINUED Figure 5. Assembly Overview—S40 and S50 VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...
  • Page 15 Figure 6. Assembly Overview—S60 and S70 VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...
  • Page 16 SYSTEM CONFIGURATIONS—CONTINUED Figure 7. Assembly Overview—S80 VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...
  • Page 17 3'3" 3'3" Figure 8. Assembly Overview—U20 and U40 VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...
  • Page 18 SYSTEM CONFIGURATIONS—CONTINUED 3'3" 3'3" Figure 9. Assembly Overview—U60 and U80 VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 19: Installation

    CL22 Two-stage thermostat Combustion air inlet adapter kit for model VPS unit size 200 Combustion air inlet adapter kit for models VCS, VCT, and VPT Wind and rain hood kit for models VCS and VCT DJ20 High-elevation conversion kit for installations at elevations >2000 feet Heater Assembly ⚠...
  • Page 20 . Slide coupler over tube joint . b . Moving between coupler pins or bolts, apply equal pressure to tighten each in turn . DO NOT OVERTIGHTEN . c . Complete assembly by installing self-tapping retention zip screws . Figure 12. Typical Coupler VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...
  • Page 21 . Alternate slip with non-slip overlaps over entire length of tube assembly as shown in e . Install corner reflectors over L- and U-tube sections . MINIMUM 1/8 INCH DETAIL A DETAIL B Figure 14. Non-Slip and Slip Reflector Bracket Overlaps VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...
  • Page 22 11 . For unvented heaters, install 4-inch 90-degree elbow on end of tube assembly terminated with vent cap as Figure 17 . Note that the vent cap may extend below the minimum heater mounting requirement of 8 shown in feet (2 .4 meters) above the floor . Figure 17. Vent Cap on Unvented Heater VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 23: Heater Suspension

    • The use of turnbuckles for heater suspension is recommended for convenience in leveling the system. Use either a Reznor turnbuckle kit or field-supplied steel, stainless steel, or malleable iron turnbuckles.

  • Page 24: Vent Connections

    • Use appropriate venting materials . • All connections must be properly sealed . • Heaters are certified as Category III for vertical and horizontal vent installations . Refer to Table 9 for approved Category III vent manufacturers . VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 25: Vertical Venting

    . • All vertical vent piping must be 4 inches in diameter . • The maximum recommended vent length is 25 feet (7 .6 meters) with a maximum of two elbows . VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 26: Horizontal Venting

    A clear silicone sealant normally used to protect concrete driveways may be used to protect masonry materials from discoloration and deterioration. If discoloration is an esthetic problem relocate the vent or install a vertical vent. VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...
  • Page 27 7 (2 .1) above Grade (ground level) 3 (0 .9) above Does not apply to the inlet of a direct vent appliance . Do not terminate the vent directly above a gas meter or service regulator . VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 28: Fresh Air Intake

    • Test pressures above 1/2 psi—disconnect the heater and manual valve from the gas supply line to be tested. Cap or plug the supply line. • Test pressures below 1/2 psi—before testing, close the manual valve on the heater. VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 29: Gas Supply Piping

    . Refer to National Fuel Gas Code for additional information on line sizing . Table 12. Gas Supply Line Sizes Diameter of Pipe (Inches) 1-1/4 1-1/2 Length of Pipe Gas Type (Feet) Cubic Feet per Hour 1100 2100 1281 1650 1007 1450 1270 1105 1050 VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 30: Supply Piping Connections

    • Leak-test all connections by brushing on a leak-detecting solution . Bleed trapped air from gas lines as needed . • If a 36-inch stainless flexible connector (option CE4) is ordered with the heater, it is shipped separately . Pressure Table 13 . drop values for option CE4 are listed in Figure 22. Gas Connections VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...
  • Page 31 Figure 23. Flexible Gas Connection Table 13. Pressure Drop Values for Option CE4 Unit Size Input (BTUh) for Models VCS and VCT 60,000 80,000 100,000 125,000 150,000 170,000 200,000 Input (BTUh) for Models VPS and VPT 50,000 75,000 100,000 125,000...

  • Page 32: Electrical Connections

    The heater’s ignition system is controlled by a control module that controls the operation of the fan motor and the combination gas valve . The display’s codes are listed and described in the Troubleshooting Using Ignition Controller section . VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 33: Operation

    ‰ Check electrical wiring—ensure that all wire gauges are as recommended—verify that fusing or circuit breakers are adequate for load use . ‰ Check polarity—verify that line voltage exists between black L1 wire and earth ground . Burner Maintenance ‰ Remove, inspect, and re-install burner in accordance with section . VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 34: Startup

    4 . If manometer indicates that manifold gas pressure needs adjustment, set correct pressure in accordance with Table 15 by turning regulator screw on combination gas valve IN (clockwise) to increase pressure or OUT (counterclockwise) to decrease pressure . VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 35: Post-Startup Checklist

    • For vented systems, failure to provide proper venting will result in a health hazard that could cause serious personal injury or death. • Never restrict or otherwise alter the supply of combustion air to any heater. Maintain the vent or vent/combustion air system in a structurally-sound and proper operating condition. VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 36: Maintenance

    ‰ Inspect fresh air inlet duct and vent to ensure that they are free from or liable to any blockage or obstruction . ‰ Clean all dirt, lint, and grease from combustion air opening . ‰ Replace any parts that do not appear sound . ‰ Check for any damaged wiring and replace as necessary . VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 37: Maintenance Procedures

    . Disconnect gas supply at union outside of cabinet using two wrenches . 2 . For models VCS, VCT, and VPT with ducted combustion air, loosen hose clamp that secures flexible hose to fresh air inlet on side of burner cabinet and remove hose .

  • Page 38: Fan And Motor Assembly Maintenance

    13 . Re-install burner in emitter tube and tighten setscrew on burner support casting . 14 . For models VCS, VCT, and VPT with ducted combustion air, connect flexible hose to fresh air inlet on side of burner cabinet and secure using hose clamp .

  • Page 39: Combination Gas Valve Maintenance

    . 7 . Reconnect fan electrical leads and re-install fan and motor assembly using existing screws . For model VPS with ducted combustion air, re-install ducted air connections . For models VCS, VCT, and VPT, re-install fan compartment panel .
  • Page 40 MAINTENANCE—CONTINUED Maintenance Procedures—Continued Combination Gas Valve Maintenance—Continued DETAIL A DETAIL B Figure 27. Combination Gas Valve Removal—Models VCS, VCT, and VPT d . For model VPS: (1) Disconnect silicone tubes from pressure switch . Figure 28, DETAIL A) . (2) Remove and save two screws that secure front of gas valve (see...

  • Page 41: Ignition Controller Replacement

    3 . Disconnect silicone tubes from pressure switch . 4 . Mark and disconnect pressure switch wiring . 5 . For models VCS, VCT, and VPT, remove and save two screws that secure electrical panel (see Figure DETAIL A) and remove panel to access and remove pressure switch mounting screws . It may be necessary to partially disconnect panel wiring to access pressure switch mounting screws .

  • Page 42: Troubleshooting

    Two flashes Combustion pressure switch closed with blower OFF Three flashes Lockout from three ignition trials Four flashes Lockout from five flame losses Five flashes Control hardware fault detected Six flashes Lockout from five pressure switch losses VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 43: Appendix: Multiple Unit Wiring Connections (Models Vct And Vpt)

    • The external two-stage thermostat is powered via its own power supply and must output to each non-control unit—24VAC for low-fire to terminal W1 and 24VAC for high-fire to terminals W1 and W2 . Refer to the thermostat manufacturer’s literature for details . VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

  • Page 44: Installation Record (To Be Completed By Installer)

    Address Phone No. Specifications and illustrations subject to change without notice or incurring obligations . Latest version of this manual is available at www.reznorhvac.com . ©2023 Nortek Global HVAC LLC, O’Fallon, MO . All rights reserved . VCS-VCT-VPS-VPT-IOM (05-23) 1042552-0...

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