Reznor CAUA Installation Manual
Reznor CAUA Installation Manual

Reznor CAUA Installation Manual

Gas conversion kit installation for gas-fired indoor heater

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GAS CONVERSION KIT INSTALLATION FOR GAS-FIRED INDOOR
HEATER
The gas conversion kits in these instructions are for model CAUA heaters equipped with specific single-stage or
two-stage gas valves. The kits are for operation at sea level. When converting a unit with a two-stage valve (option
AG2), check for the valve manufacturer. If the unit has a two-stage White-Rodgers valve, a new two-stage gas valve
is required.
Gas Valve Identification
In order to verify which conversion kit is compatible with your heater, it is necessary to know the type of gas valve on
the heater. Refer to the unit rating plate for the complete model number of the heater. Also, refer to the manufacturer's
name and number found on the gas valve. Match the model number of the valve to the one listed in the kit—if different,
contact your manufacturer representative to select and verify parts required for gas conversion.

Important Safety Information

Please read all information in this manual thoroughly and become familiar with the capabilities and use of your
appliance before attempting to operate or maintain this unit. Pay attention to all dangers, warnings, cautions, and
notes highlighted in this manual. Safety markings should not be ignored and are used frequently throughout to
designate a degree or level of seriousness.
DANGER: A danger statement describes a potentially hazardous situation that if not avoided, will result in severe
personal injury or death and/or property damage.
WARNING: A warning statement describes a potentially hazardous situation that if not avoided, can result in severe
personal injury and/or property damage.
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.
• 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.
• 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 neighbor's phone. 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.
Supersedes: CP-CAUA-GC (01-18) PN170635R9
MODEL CAUA

GENERAL INFORMATION

 ⚠ DANGER ⚠ 
FIRE OR EXPLOSION HAZARD
WHAT TO DO IF YOU SMELL GAS
Revision: CP-CAUA-GC (04-21) 170635-A

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Summary of Contents for Reznor CAUA

  • Page 1 MODEL CAUA GENERAL INFORMATION The gas conversion kits in these instructions are for model CAUA heaters equipped with specific single-stage or two-stage gas valves. The kits are for operation at sea level. When converting a unit with a two-stage valve (option AG2), check for the valve manufacturer.
  • Page 2 AG2), check for the valve manufacturer. If equipped with a Honeywell (HW) valve, select the kit listed in Table 1 Table • All kits include the quantity of orifices required for the largest size of heater. Extra burner orifices may not be returned for credit. CP-CAUA-GC (04-21) 170635-A...
  • Page 3 164866 2.10 mm 97359 1.25 mm 11830 11833 97359 1.25 mm 0–2000 US or Canada 11830 11835 9789 45870 61653 1.55 mm 84853 97359 1.25 mm 11830 38678 97359 1.25 mm 2001–3000 11830 45870 11834 45871 9789 CP-CAUA-GC (04-21) 170635-A...
  • Page 4 Table 4. Components Required for Converting Unit with Two-Stage White-Rodgers Gas Valve Two-Stage Gas Valve Unit Brass Reducing Bushing Size Plug (3/4- to 1/2-Inch) Natural Gas Propane 177396 37385 177398 107367 177397 — Used only for natural gas to propane conversions. CP-CAUA-GC (04-21) 170635-A...
  • Page 5 NOTE: Depending on when the unit was manufactured, there will be either two or three burner covers. If two, there will be right and left covers that extend over the front of the unit. If three, there will be right and left covers and a separate front cover. CP-CAUA-GC (04-21) 170635-A...
  • Page 6 When no leaks are detected, turn OFF gas supply at shutoff valve upstream of combination gas valve. 6. Restore electrical power and gas supply: a. Turn ON electrical power. b. Turn ON gas supply and relight heater in accordance with instructions on heater. CP-CAUA-GC (04-21) 170635-A...
  • Page 7 Connect manometer to 1/8-inch output pressure tap on valve (see Figure REGULATOR 1/8" OUTLET SCREW REGULATOR PRESSURE SCREW INLET PRESSURE 1/8" OUTLET INLET PRESSURE PRESSURE SINGLE-STAGE VALVES HIGH-FIRE LOW-FIRE REGULATOR SCREW REGULATOR SCREW INLET PRESSURE TAP 1/8" OUTLET PRESSURE TAP TWO-STAGE VALVE Figure 2. Gas Valves CP-CAUA-GC (04-21) 170635-A...
  • Page 8 9. Fill out conversion tape and adhere to clean, dry surface near unit rating plate. 10. Close control access panel. Specifications and illustrations subject to change without notice or incurring obligations. ©2021 Nortek Global HVAC LLC, O’Fallon, MO. All rights reserved. CP-CAUA-GC (04-21) 170635-A...

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