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Thomas & Betts RZ-NA 441-OMS Operating And Maintenance

Indoor or outdoor, gas, direct-fired, makeup air/ heating systems
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SECTION ...................... 2-4
Configuration ................................. 2
Maintenance Schedule ................... 2
1A. Blower Bearings .............................. 3
1B. Blower Belts ................................... 3
2. Filters ................................................. 3
3. Manifold Gas Pressure ...................... 3
4. Air Pressure ....................................... 4
SECTION ................... 5-15
Controls - Location ....................... 5
Diagnostic Lights .............................. 5
FOR YOUR SAFETY
WARNING: The use and storage of gasoline or
other flammable vapors and liquids in the vicinity
of this appliance is hazardous.
If you smell gas:
1. Open windows.
2. Don't touch electrical switches.
3. Extinguish any open flame.
4. Immediately call your gas supplier.
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.
C E R T I F I E D

TABLE OF CONTENTS

Page
9. Air Pressure Switches ........................ 6
•Low Air Flow Switch ...................... 6
•High Air Flow Switch ...................... 6
Flow Switches ................................ 6
10. Ignition System ................................ 6
Pressure Switches ............................. 7
•Direct-Fired Burner ........................ 7
AG33, AG35, AG36 ...................... 7
•Electronic Modulation Gas Control
Option AG37 ................................. 7
References: Installation Manual, Form RZ 441
Replacement Parts Manual, Form RZ 741
INDOOR OR OUTDOOR, GAS,
DIRECT-FIRED, MAKEUP AIR/
HEATING SYSTEMS
(Specifications subject to change without notice.)
Operation/Maintenance/Service
Applies to:
Page
•Manifold Arrangements ................. 8
•Gas Pressure Switches .................... 8
13. Door Switch ..................................... 9
14. Inlet Air Controls ............................ 9
•Air Flow Dampers ........................... 9
•Damper Motor ................................. 9
•Potentiometer .................................. 9
•Pressure Null Switch ....................... 9
15. Dirty Filter Switch ......................... 10
17. Firestat ........................................... 10
18. Freezestat ....................................... 10
19. Troubleshooting ............................. 11
the circuit board)
Index ................................................... 12
KEEP THIS BOOKLET
FOR MAINTENANCE AND
SERVICE REFERENCE.
Operating/Maintenance/Service
Instructions
The information in this manual applies to Model Series DV, di-
rect-fired heating/makeup air systems. As with any gas burning
equipment, regular maintenance procedures are required to en-
sure continued safety, reliability and efficiency of the installa-
tion.
If service is required, this system should be serviced only by a
qualified service person. Service information in this booklet is
intended as a guideline for a qualified gas-fired equipment ser-
vice person.
Form RZ-NA 441-OMS
Model Series DV
Page
Mfg No. 161442
Page 1

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Summary of Contents for Thomas & Betts RZ-NA 441-OMS

  • Page 1: Table Of Contents

    INDOOR OR OUTDOOR, GAS, DIRECT-FIRED, MAKEUP AIR/ HEATING SYSTEMS (Specifications subject to change without notice.) Operation/Maintenance/Service Form RZ-NA 441-OMS Model Series DV Page •Manifold Arrangements ... 8 •Gas Pressure Switches ... 8 12. Outside Air Ambient Cutoff ... 8 13.

  • Page 2: Maintenance Section

    DANGER: The gas burner in this direct gas-fired system 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 result is incomplete combustion which produces carbon monoxide, a poisonous gas that can cause death.

  • Page 3: Blower Bearings

    1. Drive Components The blower, motor and drive components are located in the blower cabinet at the top of the system. Systems with horizontal discharge have a cabinet with eight removable door panels. Systems with vertical discharge have a cabinet with six removable door panels. Remove the panels required to access the components being serviced.

  • Page 4: Air Pressure

    4. Air Pressure Profile plate sensing tubes should be checked quarterly and cleaned no less than semiannually. If the sensing tubes become even partially blocked, false pressure readings may be relayed. To clean, remove the screened end caps. Clean the screens and the tubes, if necessary. Re- place the cleaned end caps.

  • Page 5: Operation/Service Section

    Operation/Service Section Controls - Location, Operation, and Service To service this system, it is necessary to understand the normal operation of the controls and the function of the diagnostic circuit board. Refer to the electrical box drawing in Figure 7 and to the individual illustrations to identify and locate each of the controls.

  • Page 6: Emergency Cut Off Limit Control

    8. Temperature Limit Safety Controls (cont'd) • Emergency Cut Off Limit Control Function: The emergency cut off is a fus- ible link high temperature limit which pro- vides one-time redundant protection against overheating. If the temperature sensitive limit control malfunctions, the electrically activated emergency cutoff will shutdown the system.

  • Page 7: Electronic Modulation Gas Control Option Ag37

    tioning properly. If the ignition controller locks out and there is no other cause, the controller module must be replaced. 11. Gas Train Including Direct-Fired Burner, Gas Control Systems, Manifold Arrange-ments, and Gas Pressure Switches Direct-Fired Burner Function: The design of the direct-fired burner and the con- trolled velocity of air at the burner ensure complete combustion through the full range of burner sizes and gas inputs as determined by the gas control system.

  • Page 8: Manifold Arrangements

    11. Gas Train Including Direct-Fired Burner, Gas Control Systems, and Manifold Arrangements (cont'd) Service - All Maxitrol Controls: tions. A qualified service person should refer to the Maxitrol Trouble- shooting Guides for assistance in identifying problems and determining the correct solution. None of the Maxitrol controls have field replace- able parts.

  • Page 9: Door Switch

    Burner shutdown or modulating operation will depend on the tem- perature rise between the outside air and the discharge air setting. • may remain on continuous low fire. If the outside air control is set too high, the burner will continuously burn on low fire as long as the control switch is set to "winter".

  • Page 10: Photohelic Pressure Switch

    14. Inlet Air Controls (cont'd) Pressure Null Switch (cont'd) building pressure. It maintains a selected positive or negative pressure setpoint by changing the amount of outside air being introduced to the building through modulating outside air damper. As more pressure is required in the building, the pressure null switch activates the damper motor driving the outside air damper towards the full open position (causing the bypass return air damper to go toward the closed posi-...

  • Page 11: Guide (Check The Diagnostic Lights On

    19. Troubleshooting Chart 1 - General Troubleshooting Guide (Check the diagnostic lights on the circuit board) Symptom or Problem 1. Disconnect switch is closed, but "control power" light is not lit. 2. Disconnect switch is closed, but "firestat normal" light is not lit. 1. See causes and remedies for Problem 1 above. 3.

  • Page 12: Index

    19. Troubleshooting (cont'd) Chart 1 (cont'd) - General Troubleshooting Guide (Check the diagnostic lights) Symptom or Problem (cont'd) 14. Disconnect closed; blower and burner switches in run position; control switch is in "winter" position; "control power", high gas normal; "low gas normal";...

This manual is also suitable for:

Dv series

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