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Thomas & Betts RZ405 - page 1
Mfg No. 164771, Page 1 APPLIES TO: Installation Model CAUA Gas-Fired, Indoor , V ertical (Upflow) Power-V ented Heater INST ALLA TION FORM RZ 405 (V ersion B) Obsoletes Form RGM 405 (V ersion A) T able of Contents Installation and Operation ........................... Paragraphs 1-18 .... Pages 1-18 Optional Accessories ............................ ...
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Thomas & Betts RZ405 - page 2
Form 405, Page 2 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" ...
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Thomas & Betts RZ405 - page 3
Mfg No. 164771, Page 3 Corner indicators for cutting inlet air opening J 2-1/2 (64mm) 2-1/8 (54mm) 16 (406mm) 3-5/8 (92mm) 1 (25mm) 13-1/4 (337mm) Alternate Gas Connection 16 (406mm) 2-1/8 (54mm) 1-1/2 (38mm) Corner indicators for cutting inlet air opening K 6. Dimensions Figure 1 - Dimensions of Model CAUA NOTE: Composit ...
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Thomas & Betts RZ405 - page 4
Form 405, Page 4 7. V enting and Combustion Air W ARNING: 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. Safe operation of any power-vented gas-fired e ...
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Thomas & Betts RZ405 - page 5
Mfg No. 164771, Page 5 2 (51mm) 2 (51mm) 6 (152mm) H F E G D C B Figure 2 - Attach Combustion Air Pipe 1) Remove door panel. 2) Cut out the hole. 3) Slide pipe down through hole. 4) If collar is oval, form pipe to fit. Attach pipe to collar with sheetmetal screws and seal the connection. Collar for connecting combustion air pipe Use tin sn ...
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Thomas & Betts RZ405 - page 6
Form 405, Page 6 Instructions and Requirements for Installing Horizontal V ent T erminal/Combustion Air Inlet Option CC6 4. Pipe Diameter and Length Maximum Pipe Length from Heater to Concentric Adapter - minimum length is five feet (1524mm) Model Pi pe D i ameter Maximum 90° Elbow 45° Elbow CAUA V e nt Inlet Air Length Equals* Equals* 150-200 5 ...
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Thomas & Betts RZ405 - page 7
Mfg No. 164771, Page 7 2. Prepare clearance hole through the outside wall for a 6" diameter pipe (Size 150 or 200) or an 8" diameter pipe (Size 250, 300, 350, or 400). Outside wall construction thickness should be between 1" (25mm) minimum and 30" (762mm) maximum. The larger diameter combustion air pipe serves as clearance for t ...
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Thomas & Betts RZ405 - page 8
Form 405, Page 8 Figure 5D - Installation of a T ypical Separated- Combustion Unit with Horizontal V ent and Combustion Air Pipes (Option CC6) Building Overhang 3 ft (914mm) minimum 6-15/16 (176mm) V ent Pipe - PITCH TO DRAIN Adjoining Building 3 ft (914mm) minimum Thimble W all 16(406mm) minimum 24(610mm) minimum IMPORT ANT NOTE: Exhaust ...
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Thomas & Betts RZ405 - page 9
Mfg No. 164771, Page 9 Collar for combustion air pipe. V ent Pipe - when a taper-type reducer is required in the vent pipe; it must be no more than 6 (152mm) from the box. Seal the seam in the vent pipe. Concentric Adapter Box Combustion air pipe Field-supplied mounting brackets Install seal in vent pipe opening Install the vent pipe by insertin ...
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Thomas & Betts RZ405 - page 10
Form 405, Page 10 4) V ent System Support Lateral runs should be supported every six feet (1.8M) using a non-combus- tible material, such as strap steel or chain. Do not rely on the heater for support of either horizontal or vertical vent pipe. Figure 8 - Alternate V ent Directions Specific V enting Requir ements ( read all before installing ) 1) V ...
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Thomas & Betts RZ405 - page 11
Mfg No. 164771, 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, in ...
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Thomas & Betts RZ405 - page 12
Form 405, Page 12 Combustion Air Knockout V enter Outlet Electrical Gas 6-3/8 (162mm) 4-1/8 (105mm) 2-3/8 (60mm) A B 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. IMPOR T ANT NOTE: If a Mo ...
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Thomas & Betts RZ405 - page 13
Mfg No. 164771, Page 13 Sizing a Gas Supply Line 9. Gas Piping and Pressures W ARNING: 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 SUPPL ...
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Thomas & Betts RZ405 - page 14
Form 405, Page 14 3 4 2 1 (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. Instructions to Check Manifold Pressure (when unit is operating): 1) With the manual va ...
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Thomas & Betts RZ405 - page 15
Mfg No. 164771, Page 15 Limit Control Supply Wiring T erminal Block (behind the gas valve) (Line voltage enters the control compartment through a hole in the top of the heater cabinet.) Thermostat T erminal Strip (Thermostat wires enter the control compartment through a hole in the right side of the heater cabinet.) Contactors Gas V alve Ignition C ...
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Thomas & Betts RZ405 - page 16
Form 405, Page 16 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). Belt ...
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Thomas & Betts RZ405 - page 17
Mfg No. 164771, Page 17 TYPICAL WIRING DIAGRAMS Figure 17 - T ypical W iring Diagram for Model CAUA with Direct-Drive Blower Motor(s) 208 OR 230/1/60 GRD G BK OPTIONAL DISCONNECT SWITCH CONT ACTS HEA T SPEED W MOTOR BLOWER L1 L2 PROTECTED INHERENTL Y COOL SPEED CONT ACTS BL BK W BL W BK BK W INHERENTL Y PROTECTED BLOWER MOTOR G GRD BL BL BK BK W W ...
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Thomas & Betts RZ405 - page 18
Form 405, Page 18 Figure 18 - T ypical W iring Diagram for Models CAUA with Belt-Drive Blower Motor 40 V A. CONTROL BK BL 24V LINE VOL T BR TRANSFORMER Y LINE GROUND PSW HI LIMIT HI LIMIT PRESSURE SWITCH HIGH LIMIT W G R 24V AC FLAME SENSING PROBE FLAME SENSE IGNITOR HV LEAD ROLLOUT LED BK BK BL BL BL BL R Y Y R BR BR R BR R CHASSIS GRND. BURNER GR ...
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Thomas & Betts RZ405 - page 19
Mfg No. 164771, Page 19 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 t ...
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Thomas & Betts RZ405 - page 20
Form 405, 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. T o ada ...
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Thomas & Betts RZ405 - page 21
Mfg No. 164771, Page 21 20. Discharge Plenum (Sizes 350 and 400 only) The optional discharge plenum is designed to be used with a screened mounting base (Paragraph 21) to create a "packaged stand-alone" upflow system that circulates building air . However , the discharge plenum may also be used in place of ductwork in applications that do ...
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Thomas & Betts RZ405 - page 22
Form 405, Page 22 T op V iew of Gas V alve used on CAUA 150 and 200 Control Knob on T op of Gas V alve used on CAUA 250 - 400 Check/T est/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, ...
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Thomas & Betts RZ405 - page 23
Mfg No. 164771, Page 23 DANGER: The gas burner in this gas-fired equipment is designed and equipped to provide safe and economically controlled complete combustion. However , if the installation does not permit the burner to receive the proper supply of combustion air , complete combustion may not occur . The r esult is incomplete combustion which ...
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Thomas & Betts RZ405 - page 24
Form 405, Page 24 ©2001 Thomas & Betts Corporation, All rights reserved. Printed in the U.S.A. MANUF ACTURER OF HEA TING, COOLING, AND VENTILA TING SYSTEMS T rademark Note: Reznor ® is registered in the United States and other countries. (800) 695-1901; www .ReznorOnLine.com 2/01 YL Form RZ 405 (V ersion B) ...
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