Table of Contents
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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
Index
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
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
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.
C E R T I F I E D
Table of Contents
By Page No.
Index
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
Gas-Fired, Indoor, Vertical (Upflow)
INSTALLATION FORM RZ 405 (Version B)
Obsoletes Form RGM 405 (Version A)
APPLIES TO:
By Page No.
Index
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
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
FOR YOUR SAFETY
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
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
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).
Model CAUA
Power-Vented Heater
Installation
By Page No.
Mfg No. 164771, Page 1
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Summary of Contents for Thomas & Betts RZ405
- Page 1 C E R T I F I E D 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 Index By Page No. Belt Drive ...
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Page 2: Uncrating And Preparation
GENERAL (Cont'd) Separated-combustion units are designed to separate the air for com- bustion and the flue products from the environment of the building in which the unit is installed. Separated-combustion appliances are rec- ommended for use in dust laden and some corrosive fume environments or in buildings with negative pressure (up to .15"... -
Page 3: Dimensions
6. Dimensions Figure 1 - Dimensions of Model CAUA Top View Front View NOTE: Composite drawings are not proportional for all sizes. Dimensions (inches + or - 1/8") Size A 38 34-3/4 36 7-1/4 3-3/4 12-1/2 38 34-3/4 36 7-1/4 3-3/4 12-1/2 50 34-3/4 48 7-1/4 4-3/8 12-3/4 27-1/4 50 34-3/4 48... -
Page 4: Installation Should Be Done By A Qualified Agency In Accordance With The
7. Venting and Combustion Air WARNING: The vent must be installed in accordance with national and local regulations. Failure to provide proper venting could result in death, serious injury and/or property damage. This unit must be installed with a vent to the outside of the building. -
Page 5: Separated-Combustion Installation
7A. Venting and Combustion Air Requirements for Separated-Combustion Installation (must use either Option CC2 or CC6) Specific Requirements (read all before installing) Comply with the specific requirements and instructions in the following paragraphs and illustrations. 1. Combustion Air Inlet Diameter is 5" for Sizes 150 and 200 and 6" for Sizes 250, 300, 350, and 400. - Page 6 7. Venting and Combustion Air (cont'd) 7A. Venting and Combustion Air Requirements for Separated-Combustion Installation (must use either Option CC2 or CC6) (cont'd) 4. Pipe Diameter and Length Maximum Pipe Length from Heater to Concentric Adapter - minimum length is five feet (1524mm) Model Pipe Diameter Maximum 90°...
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Page 7: Vent And Combustion Air
Minimum Clearances for Vent Termination Location (all S tructure directions unless specified) Forced air inlet within 10 ft 3 ft (0.9m) above (3.1m) Combustion air inlet of 6 ft (1.8m) another app liance Door, window, or gravity air 4 ft (1.2m) horizontally inlet (any building op ening) 4 ft (1.2m) below 1 ft (30cm) above... - Page 8 7. Venting and Combustion Air (cont'd) 7A. Venting and Combustion Air Requirements for Separated-Combustion Installation (must use either Option CC2 or CC6) (cont'd) Figure 5D - Installation of a Typical Separated- Combustion Unit with Horizontal Vent and Combustion Air Pipes (Option CC6) Side View Instructions and Requirements for Installing a Vertical Vent Terminal/Combustion Air Inlet (Requires Concentric Adapter Kit, Option CC2)
- Page 9 "X" is the length of combustion air pipe required through and above the roof "X" must equal roof thickness plus clearance required for anticipated snow plus ridge and/or parapet clearance "X" must not exceed 60" (1524mm) cause the pipe diameter does not change); plus bracket length; plus the width of the roof;...
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Page 10: Confined Space Installation
7. Venting and Combustion Air (cont'd) 7B. Venting and Combustion Air Requirements for Power Vent Drawing Combustion Air from THE INSIDE SPACE and Venting Flue Products to the Outdoors (vent cap is required) If the environment has a positive pressure and is such that it is not detrimental to combustion air, this system may be installed. - Page 11 5) Condensation Any length of single-wall vent pipe exposed to cold air or run through an unheated area or an area with an ambient temperature of 45°F or less must be insulated along its entire length with a minimum of 1/2" foil-faced fiberglass, 1-1/2# density insulation. Where extreme conditions are anticipated, install a means of con- densate disposal.
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Page 12: Duct Connections
8. Duct Connections and Ductwork Both inlet air ductwork and supply air discharge ductwork are required unless the heater is equipped with an optional inlet base and/or an optional discharge plenum. IMPORTANT NOTE: If a Model ACU cased cooling coil is part of the installation, it must be installed before attaching discharge ductwork. -
Page 13: Gas Piping And Pressures
9. Gas Piping and Pressures WARNING: This appliance is equipped for a maximum gas supply pressure of 1/2 pound, 8 ounces, or 14 inches water column. Supply pressure higher than 1/2 pound requires installation of an additional lockup-type service regulator external to the unit. PRESSURE TESTING SUPPLY PIPING Test Pressures Above 1/2 PSI: Disconnect the heater and manual valve from the gas supply line which is to be tested. -
Page 14: Electrical Supply And Connections
9. Gas Piping and Pressures (cont'd) Manifold Pressure Settings (cont'd) (supply) pressure must be within the specified range for the gas being used both when the heater is in operation and on standby. Incorrect inlet pressure could cause excessive mani- fold gas pressure immediately or at some future time. -
Page 15: Belt Drive
13. Combustion Air Proving Switch The combustion air proving switch is a pressure sensitive switch that monitors air pressure to ensure that proper combustion air is available. The switch is single pole/double throw with the normally open contacts closing when the proper airflow is sensed in the system. On start-up when the heater is cold, the sensing pressure is at the most negative level, and as the heater and flue system warm up, the sensing pressure becomes less negative. -
Page 16: Gas Valve
14. Blower Motor and Drive (cont'd) Adjusting Blower Speed The blower speed may be adjusted to achieve the desired outlet tem- perature, as long as the adjustment is within the temperature rise and the static pressure limits shown on the heater rating plate. Direct drive motors are factory set at medium speed for heating and high speed for cooling (if ordered). -
Page 17: Typical Wiring Diagrams
TYPICAL WIRING DIAGRAMS Figure 17 - Typical Wiring Diagram for Model CAUA with Direct-Drive Blower Motor(s) Mfg No. 164771, Page 17... - Page 18 TYPICAL WIRING DIAGRAMS (cont'd) Figure 18 - Typical Wiring Diagram for Models CAUA with Belt-Drive Blower Motor Form 405, Page 18...
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Page 19: Electrical Connections
OPTIONAL ACCESSORIES 17. Optional Cased Cooling Coil, Model ACUA, ACUB, or ACUC This cased cooling coil is designed for use with the Model CAUA upflow heater. It is shipped separately for field installation over the discharge opening of the heater. Before installing, verify that the coil cabinet is the same size as the heater cabinet. Follow the installation instructions shipped with the cooling coil (Installation Form RZ 405-CC), the wiring diagram, and the instructions provided by the compressor manufacturer. - Page 20 OPTIONAL ACCESSORIES (cont'd) 18. Optional Filter Cabinet (return air only) A filter cabinet designed for 2" pleated disposable or permanent metal filters is shipped separately for field assembly and installation. Depending on the option selected, filters are either shipped with the cabinet or are field-supplied. To adapt to a variety of applications, the heater cabinet is designed so that the filter cabinet can attach on either the right side, the left side, or the rear of the heater.
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Page 21: Discharge Plenum
Configurations/Accessories Before installing, check to be sure that the configuration of the mixing box matches the order and that any accessories ordered are part of the cabinet. Factory-installed optional accessories could include a damper motor, potentiometer, return air controller, mixed air controller, and/or filters. -
Page 22: Check/Test/Start-Up
Check/Test/Start-Up 22. Check Installation & Start-Up Check the installation prior to start-up: Check clearances from combustibles. Requirements are shown in Paragraph 4. If installed as a separated-combustion unit, check vent/combustion air system to be sure that it is installed according to the instructions in Paragraph 7A. -
Page 23: Check Installation After Start-Up
TO TURN OFF GAS TO THE APPLIANCE 1) Set thermostat to lowest setting 2) If service is to be performed, turn off all electric power to the appliance. 3) Open the access door. 4) Turn the gas control knob to "OFF" (follow instruc- tions in No. - Page 24 ©2001 Thomas & Betts Corporation, All rights reserved. Printed in the U.S.A. MANUFACTURER OF HEATING, COOLING, AND VENTILATING SYSTEMS ® Trademark Note: Reznor is registered in the United States and other countries. (800) 695-1901; www.ReznorOnLine.com Form 405, Page 24 2/01 YL Form RZ 405 (Version B)
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