Reznor CAUA Users Manual - Manual (Page 2)

Form O-CAUA, Page 2
2.0 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 conditions should be
inspected and cleaned at the start of each heating season. If the heater is operating
in an area where an unusual amount of dust, soot, or other impurities are present in
the air, more frequent maintenance is recommended. If the system includes a cooling
coil, the coil and condensate drains should be checked at the beginning of the cooling
season.
The paragraphs that follow discuss the components and systems that require routine
inspection/maintenance. At the beginning of each section, there is a code indicating
the main reason why that maintenance procedure is necessary. The legend for that
code is shown on the left.
WARNING
If you turn off the
power supply, turn off
the gas. See Hazard
Levels, Page 2.
HAZARD INTENSITY LEVELS
1. DANGER: Failure to comply will result in severe personal injury or death
and/or property damage.
2. WARNING: Failure to comply could result in severe personal injury or
death and/or property damage.
3. CAUTION: Failure to comply could result in minor personal injury and/or
property damage.
1.0 General The operation/maintenance/service instructions in this manual apply to Reznor ® Model
CAUA upflow, separated-combustion, gas-fired heater. As with any gas-burning equip-
ment, regular maintenance procedures are required to ensure continued safety, reli-
ability, and efficiency of the installation.
If service is required, this heater should be serviced only by a qualified service techni-
cian. Service information is this booklet is intended as a guideline for a qualified gas-
fired equipment service technician.
2.1 Maintenance
Schedule
The following procedures should be carried out at least annually. Follow the instruc-
tions in Paragraph 2.2.
□
Clean the blower and motor. If equipped with a belt drive, check the belt.
□
Check the filters.
□
Check the gas valve to ensure that gas flow is being shutoff completely.
□
Check the burners for scale, dust, or lint accumulation.
□
Check the ignitor
□
Clean the venter
□
Clean the heat exchanger both internally and externally.
□
Check the vent or vent/combustion air system
□
Check the wiring for any damaged wires. Replace damaged wiring.
□
If equipped with a cooling coil, check the drain lines. Clean as needed.
1.0 General ................................................................ 2
2.0 MAINTENANCE ................................................ 2-6
2.1 Maintenance Schedule .........................................2
2.2 Maintenance Procedures .....................................3
2.2.1 Blower and Blower Motor .............................. 3
2.2.2 Filters ............................................................... 3
2.2.3 Gas Valve ......................................................... 4
2.2.4 Burner Maintenance ........................................ 4
2.2.5 Ignition System ............................................... 5
2.2.6 Cleaning the Heat Exchanger ........................ 6
2.2.7 Venter Motor and Wheel ................................. 6
2.2.8 Vent or Vent/Combustion Air System ............ 6
2.2.9 Condensate Drain ........................................... 6
3.0 SERVICE - Control Location, Operation,
and Service .................................................... 6-16
3.1 Control Locations .................................................7
3.2 Heater Rating Plate ...............................................7
3.3 Service Procedures ..............................................7
3.3.1 Operating Gas Valve ....................................... 7
3.3.2 Ignition System ............................................... 7
3.3.3 Combustion Air Proving Switch .................. 10
3.3.4 Limit Control .................................................. 10
3.3.5 Flame Rollout Switch .................................... 11
3.3.6 Venter Motor and Wheel Assembly ............. 11
3.3.7 Transformer ................................................... 12
3.3.8 Blower Motor and Drive ................................ 12
3.3.9 Blower Compartment Door Switch ............. 12
3.3.10 Inlet Air Dampers and Controls ................ 12
3.3.11 Ductstat used in Makeup Air
Gas Control ................................................. 14
3.4 Troubleshooting .................................................14
INDEX ....................................................................... 16
REFERENCES ......................................................... 16
TABLE OF CONTENTS
NOTE: Use only
factory-authorized
replacement parts.