Reznor CAUA Manual
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Reznor CAUA Manual

Reznor CAUA Manual

Gas-fired indoor vertical (upflow), power-vented heater
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Operation, Maintenance, and Service
Model CAUA
with Optional Cased
Cooling Coil
KEEP THIS BOOKLET FOR MAINTENANCE
If you smell gas:
1. Open windows.
2. Don't touch electrical switches.
3. Extinguish any open flame.
4. Immediately call your gas supplier.
The use and storage of gasoline or other flammable vapors
and liquids in open containers in the vicinity of this appli-
ance is hazardous.
WARNING: Improper installation, adjustment, alteration,
service, or maintenance can cause property damage, injury,
or death. Read the installation, operation, and maintenance
instructions thoroughly before installing or servicing this
equipment.
WARNING: Gas-fired appliances are not designed for use
in hazardous atmospheres containing flammable vapors or
combustible dust. See Hazard Levels on page 2.
AND SERVICE REFERENCE.
FOR YOUR SAFETY
Form O-CAUA (Version A)
Obsoletes Form O-CAUA
Applies to:
Model CAUA
Gas-Fired Indoor
Vertical (Upflow),
Power-Vented Heater
CQS
CQS
Form O-CAUA, P/N 164772 R4, Page 1

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  • Page 1 Read the installation, operation, and maintenance instructions thoroughly before installing or servicing this equipment. WARNING: Gas-fired appliances are not designed for use in hazardous atmospheres containing flammable vapors or combustible dust. See Hazard Levels on page 2. Form O-CAUA, P/N 164772 R4, Page 1...

  • Page 2: Table Of Contents

    2. MAINTENANCE A Model CAUA will operate with a minimum of maintenance. To ensure long life and satisfactory performance, a heater that is operated under normal condi- tions should be inspected and cleaned at the start of each heating season. If...

  • Page 3: Maintenance Procedures

    Size Disposable Filters *Application requires 2" permanent; do not 150, 200 (6) 16x16 - 2" Filters use pleated filters. 250, 300 (8) 16x16 - 2" Filters 350, 400 (12) 16x16 - 2" Filters Form O-CAUA, P/N 164772 R4, Page 3...

  • Page 4: Gas Valve

    Observe the gas pressure. There should be no loss of gas pressure on the manometer. If the manometer indicates a loss of pressure, replace the combination gas valve before placing the heater in operation. Form O-CAUA, Page 4...

  • Page 5: Burner Maintenance

    Wipe the inside refrigerant coil cleaner, of the burner tubes clean. (Cleaning the burners with an aerosol degreaser is and compressed air) highly recommended as the degreaser will retard future buildup of dirt.) Form O-CAUA, P/N 164772 R4, Page 5...

  • Page 6: Ignition System

    Do not attempt to disassemble the igni- tion control module. However, each heating season the lead wires should be checked for insulation deterioration and good connections. Proper operation of the direct spark ignition system requires a minimum flame signal of 1.0 microamps as measured by a microampmeter. Form O-CAUA, Page 6...

  • Page 7: Cleaning The Heat Exchanger

    WARNING: Do not use this appliance if any part has been un- der water. Immediately call a qualified service technician to inspect the appliance and replace any gas control which has been under water. WARNING: If you turn off the power supply, turn off the gas. See Hazard Levels, Page 2. Form O-CAUA, P/N 164772 R4, Page 7...

  • Page 8: Service - Control Location, Operation, And Service

    Valve Service: The valve has no field-repairable parts. Carefully remove external dirt accumulation from the valve and check wiring connections. Refer to Form I-CAUA, Paragraph 6.1, for instructions on checking manifold pressure. Valve The gas valve must be checked annually to ensure that the valve is shutting off gas flow completely;...

  • Page 9: Combustion Air Proving Switch

    The main burners will remain off until the system has cooled and/or the flue system resistance is reduced. The table below lists the approxi- mate water column negative pressure readings and switch setpoints for sea level operating conditions. Form O-CAUA, P/N 164772 R4, Page 9...

  • Page 10: Limit Control

    TABLE 4). 350-400 112752 225°F Function: The venter assembly provides a metered flow of combustion air 3.3.5 Venter Motor to the burner and exhausts the products of combustion to the outside atmo- and Wheel Assembly sphere. Form O-CAUA, Page 10...

  • Page 11: Transformer

    7. Install the assembled venter motor and wheel. Follow the wiring diagram to connect the venter wires. Close the access panel. 3.3.6 Transformer Function: The 40VA transformer reduces the supply voltage to a 24-volt circuit in order to operate the 24-volt controls. Form O-CAUA, P/N 164772 R4, Page 11...

  • Page 12: Blower Motor And Drive

    The function of the motor and drive is to provide airflow through the heat replacing a belt, see exchanger and supply air to the space. Model CAUA units are equipped either Maintenance Section, with a direct-drive or a belt-drive blower and motor.
  • Page 13 When in the heating mode, the temperature of the "mixed" return and outside air entering a standard Model CAUA heater must always be 35°F or above. Only when the heater is factory equipped with makeup air Option AD4 can the entering air temperature be below 35°F.

  • Page 14: Troubleshooting

    Heating and GA2, Cooling IMPORTANT NOTE: The standard GA3, To minimize cooling energy consumption and equipment Model CAUA is designed for a maxi- GA4, cycling, when the sensor detects a low enthalpy (heat mum temperature rise of 75°F. Above GA5, 2-Position content in a lb of air) in the outside air, the control will open 35°F (2°C) outside air temperature, any...
  • Page 15 8. Incorrect polarity. 8. Reverse 115V line connections at ignition control module. No heat (Heater 1. Incorrect manifold pressure or orifices. 1. Check manifold pressure (See Form I-CAUA, Paragraph 6.1). Operating) 2. Cycling on limit control. 2. Check airflow. 3. Improper thermostat location or adjustment.

  • Page 16: Index

    REFERENCES Description ....................Form Model CAUA Installation Manual ............I-CAUA Model ACU or Option C Cased Cooling Coil Installation ..I-CAUA-CC Optional Discharge Plenum Installation Instructions ....I-CAUA-DP Optional Filter Cabinet Installation Instructions ....... I-CAUA-FC Optional Inlet Air Mounting Base Installation Instructions ..I-CAUA-IB Optional Mixing Box Installation Instructions ......I-CAUA-MB...

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