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Mfg No. 164771, Page 1
APPLIES TO: Installation
Model CAUA
Gas-Fired, Indoor, Vertical (Upflow)
Power-Vented Heater
INSTALLATION FORM RZ 405 (Version B)
Obsoletes Form RGM 405 (Version A)
Table of Contents
Installation and Operation ...........................Paragraphs 1-18 .... Pages 1-18
Optional Accessories ................................ Paragraphs 19-21 .. Pages 19-21
Check Installation and Start-Up ........................Paragraph 22 .. Pages 22-23
FOR YOUR SAFETY
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
Index By Page No.
Belt Drive ............................................. 15
Blower Motor and Drive ...................... 15
Check/Test/Start-Up ............................. 22
Clearances ................................................ 2
Combustion Air ...................................... 4
Combustion Air Proving Switch ........... 15
Concentric Adapter ............................ 2, 5
Condensate Drain .......................... 14
Confined Space Installation .................. 10
Cased Cooling Coil (Model ACU) ..... 2, 19
Control Location Illustration ................. 15
Dimensions ............................................. 3
Index By Page No.
Motor Amps ......................................... 16
Mounting the Heater .............................. 2
Start-Up................................................. 22
Thermostat ........................................... 14
Uncrating and Preparation ...................... 2
Vent and Combustion Air ....................... 4
Determine Type of Vent ........................ 4
Power Vent Only Installation ......... 10-11
Separated-Combustion Installation ... 5-9
Warranty .................................................. 2
Wiring Diagrams .............................. 17-19
Index By Page No.
Discharge Plenum (Optional) ............ 2, 21
Duct Connections ................................. 12
Electrical Supply and Connections ....... 14
Filter Cabinet (Optional) .................. 2, 20
Gas Piping and Pressures ..................... 13
Gas Valve .............................................. 16
General .................................................... 1
Hazard Intensity Levels ......................... 2
Ignition System ..................................... 16
Inlet Base (Optional) ......................... 2, 21
Installation Codes ................................... 2
Mixing Cabinet (Optional) .............. 2, 21
FOR YOUR SAFETY
What to do if you smell gas:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call
your fire department.
WARNING: Improper installation, adjustment,
alteration, service, or maintenance can cause
property damage, injury, or death. Refer to this
manual. For assistance or additional information,
consult a qualified installer, service agency, or the
gas supplier.
WARNING: Gas-fired appliances are not
designed for use in hazardous atmospheres
containing flammable vapors or combustible dust.
See Hazard Levels, page 2.
GENERAL
Installation should be done by a qualified agency in accordance with the
instructions in this manual and in compliance with all codes and re-
quirements of authorities having jurisdiction. The instructions in this
manual apply to the heater model shown below.
Model Description
CAUA Gas-Fired,
Power-Vented,
Vertical (Upflow)
Heater
C E R T I F I E D
REFERENCES:
Operation/Maintenance/Service Manual, Form RZ 405-OMS
Installation Manual for Model ACU Cooling Coil, RZ 405-CC
Gas Conversion Instructions for Model CAUA, RZ 405-GC
Model CAUA heaters are design-certified by the Canadian Standards
Association (CSA) to ANSI Z83.6 and CGA 2.6-M96 for industrial/
commercial installations in the United States and Canada. Heaters are
available for use with either natural or propane gas. The type of gas, the
firing rate, and the electrical characteristics are on the unit rating plate.
A Model CAUA heater requires installation of an inlet air duct or an
optional inlet air base and a supply duct or an optional discharge ple-
num. This heater may be installed as a separated-combustion system
(taking combustion air from outside) or as a power-vented system
(taking combustion air from the space where the heater is installed).
Installation Manual for Optional Filter Cabinet, RZ 405-FC
Installation Manual for Optional Mixing Box, RZ 405-MB
Installation Instructions for Optional Inlet Base, RZ 405-IB
Installation Instructions for Optional Discharge Plenum, RZ 405-DP