Table of Contents
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Table of Contents
Warnings ........................................ 1
Installation/Operation .............. 2-25
Check/Test/Startup ................. 26-28
Maintenance/Service .............. 28-36
Index (by page)
Burner ................................................... 16, 29
Burner Orifice ............................................ 30
Burner Removal ........................................... 29
California Warning Label .............................. 3
Clearances .................................................... 7
Installation Codes ......................................... 2
Confined Space (UDAP) ............................... 8
Dimensions ................................................ 4-5
Disconnect, Built-in (UDAS) ................ 16, 34
Door Switch (UDAS) ............................ 19, 33
Downturn Nozzle (Option) ............................ 4
Electrical Connections ............................... 16
Fan ............................................................... 32
Fan Motor ............................................... 22, 32
Flame Rollout Switch ......................... 18, 34
Gas Piping and Pressures ........................... 12
Gas Valve ............................................... 22, 33
General .......................................................... 2
Hanging the Heater ...................................... 10
Hazard Intensity Levels ............................... 2
Heat Exchanger Maintenance ...................... 29
High Altitude ............................................ 6, 14
Ignition System ...................................... 19, 31
Limit Control ......................................... 18, 33
Location (Heater) ........................................... 9
Maintenance Schedule ............................... 28
Pressure Switch (Combustion Air) ....... 17, 33
Replacement Parts ................ See Form P-UD
Sound Data ................................................... 6
Startup .......................................................... 26
Suspending Heater ....................................... 4
Technical Data ............................................... 6
Thermostat (Option) .................................. 17
Throw (Heater) .............................................. 9
Transformer .................................................. 33
Troubleshooting ................................... 34-36
Uncrating and Preparation ........................... 3
Valve Outlet Pressure ................................... 14
Vent System ............................................... 34
Venter Motor ............................................... 32
Venting Model UDAP ........ Use Form I-V-PV
Venting Model UDAP-CV Use Form I-V-CV
Venting Model UDAS ......... Use Form I-V-SC
Warranty ......................................................... 3
Wiring Diagrams .................................... 23-25
C E R T I F I E D
Page
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.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
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.
WARNING: Gas-fired appliances are not designed for use in
hazardous atmospheres containing flammable vapors or
combustible dust, in atmospheres containing chlorinated or
halogenated hydrocarbons, or in applications with airborne
silicone substances. See Hazard Levels, page 2.
WARNING: Should overheating occur, or the gas supply fail to
shut off, shut off the manual gas valve to the appliance before
shutting off the electrical supply.
WARNING: Do not use this appliance if any part has been under
water. Immediately call a qualified service technician to inspect
the appliance and replace any gas control that has been under
water.
Series Fan-Type
Installation/Operation FORM RZ-NA I-UDA
APPLIES TO:
FOR YOUR SAFETY
FOR YOUR SAFETY
Form RZ-NA I-UDA, Mfg #195673 Rev 5, Page 1
Unit Heaters
Models UDAP and UDAS
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Table of Contents
Troubleshooting
Related Manuals for Thomas & Betts UDAP
Summary of Contents for Thomas & Betts UDAP
- Page 1 Uncrating and Preparation ... 3 Valve Outlet Pressure ... 14 Vent System ... 34 Venter Motor ... 32 Venting Model UDAP ... Use Form I-V-PV Venting Model UDAP-CV Use Form I-V-CV Venting Model UDAS ... Use Form I-V-SC Warranty ... 3 Wiring Diagrams ...
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Page 2: Hazard Intensity Levels
3. CAUTION: Failure to comply could result in minor personal injury and/or property damage. Model UDAP 30 to 125 and Model UDAS 30 to 125 are design certified by the Canadian Standards Association for use in residential, industrial, and commercial installations. -
Page 3: California Warning Label
Special Installations (Aircraft Hangars/ Repair Garages/ Parking Garages) California Warning Label Massachusetts Requirement 3. Warranty 4. Uncrating and Preparation Installations in aircraft hangars should be in accordance with ANSI/NFPA No. 409 (latest edition), Standard for Aircraft Hangars; in public garages in accordance with ANSI/NFPA No. - Page 4 5. Dimensions MODEL UDAP DIMENSIONS (inches ± 1/16) Size 12-1/8 26-5/8 13-13/16 30, 45 15-1/8 26-5/8 13-13/16 15-1/8 26-5/8 13-13/16 27-5/8 21-9/16 23-1/8 26-5/8 13-13/16 28-5/8 21-9/16 14-1/2 23-1/8 26-5/8 13-13/16 29-3/8 21-9/16 14-1/2 150, 175, 20-1/8 38-3/16 225, 250...
- Page 5 MODEL UDAS DIMENSIONS (inches ± 1/16) Size 12-1/8 26-5/8 10 13-13/16 30, 45 15-1/8 26-5/8 13 13-13/16 27 15-1/8 26-5/8 13 13-13/16 27-5/8 21-9/16 7-7/8 23-1/8 26-5/8 21 13-13/16 28-5/8 21-9/16 14-1/2 6-1/2 23-1/8 26-5/8 21 13-13/16 29-3/8 21-9/16 14-1/2 6-1/2 150, 20-1/8 38-3/16 16 175,...
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Page 6: Technical Data
Smaller and/or larger vent and combustion air pipe diameters may be permissible. For Model UDAS refer to the Venting Installation Manual for Separated Combustion Units. For Model UDAP refer to the Venting Installation Manual for Power Vented units. For a Model UDAP with Option AV6, refer to the Venting Installation Manual for Common Venting. -
Page 7: Clearances
FIGURE 4 - Installing High Altitude Pressure Switch required above 6000 ft (1830M) elevation Model UDAP Size High Altitude Switch P/N Negative Pressure OFF Setpoint "w.c. Label color Model UDAP-CV with Option AV6 for Common Venting Size High Altitude Switch P/N Negative Pressure OFF Setpoint "w.c. Label color Model UDAS... - Page 8 Under ALL conditions, enough air must be provided to ensure there will not be a negative pressure condition within the equipment room or space. WARNING: Model UDAP and UDAP-CV power-vented unit heaters are designed to take combustion air from the space in which the unit is installed and are not designed for connection to outside combustion air intake ducts.
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Page 9: Location Recommendations
Dimensions X, Y, and Z (feet) Model UDAP and Model UDAS with Standard Horizontal Louvers at Mounting Heights of 5 - 18 ft 5 ft 30 -21° 40 -20°... -
Page 10: Hanging The Heater
Before suspending the heater, check the supporting structure to be used to verify that it has sufficient load-carrying capacity to support the weight of the unit. Model UDAP Size Model UDAS... - Page 11 FIGURE 7A - Suspending the Heater with Rods from the Threaded Nut Retainers (either two or four point suspension) WARNING: Unit must be level for proper operation. Do not place or add additional weight to the suspended heater. Hazard Levels, page 2. FIGURE 7B - Swivel Connectors to Suspend the Heater from 1”...
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Page 12: Gas Piping And Pressures
12. Gas Piping Pressures Sizing Supply Specific Gravity for Propane Gas -- 1.6 (Propane Gas -- 2550 BTU/Cubic Ft) Line Length 1/2" Pipe Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane 20’ 30’ 40’ 50’ 60’ 70’... - Page 13 FIGURE 10 - Gas connection is at the pipe nipple that extends outside the cabinet Illustration shows both a vertical and horizontal gas supply; requirements are the same. Valve Outlet or Orifice Pressure Setting NOTE: Gas Conversion Kits are available for changing from propane gas to natural gas or natural gas to propane gas.
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Page 14: Valve Outlet Pressure
12. Gas Piping Pressures (cont’d) Derate by Valve Outlet Pressure Adjustment for High Altitude Operation This adjustment can only be done after the heater is in operation. It is included in the startup procedures. NOTE: If elevation is above 6000 ft (1830M), a high altitude pressure switch is required;... - Page 15 High Altitude Capacity Changes BTUH Inputs and Capacities by Altitude in the UNITED STATES for Model UDAP and Model UDAS Thermal Normal ALTITUDE Output Input Capacity Feet Meters Size 30 0-2000 0-610 30000 24600 2001-3000 611-915 28200 23124 3001-4000 916-1220...
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Page 16: Electrical Supply And Connections
Model UDAS supply wiring connects to leads located inside a sealed electrical box. To maintain the sealing feature of the electrical box, always replace the cover plate. Model UDAP supply wiring connects directly to leads on the integrated circuit board. -
Page 17: Thermostat (Option)
The combustion air proving switch is a pressure sensitive switch that monitors air pressure to ensure that proper combustion airflow is available. On Model UDAP, the switch is a single pole/normally open device which closes when a negative pressure is sensed in the venter housing. -
Page 18: Vent System
The two Tables on the left below list the approximate water column negative pres- sure readings and switch setpoints for sea level operating conditions for Model UDAP and Model UDAP-CV heaters. The Table on the right lists the approximate water column differential pressure readings and switch setpoints for sea level op- erating conditions for Model UDAS heaters. -
Page 19: Ignition System
19. Door Switch - Model UDAS only 20. Ignition System FIGURE 14 – DSI Integrated Control Module (circuit board) Spark Transformer Control Status - Green LED Codes Steady ON... Normal Operation, No call for heat Fast Flash ... Normal Operation, Call for heat 1 Flash ... - Page 20 20. Ignition System (cont’d) Normal Heat Cycle Operating Sequence (cont’d) Abnormal Heat Cycle Functions Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 20 When the pressure switch is proven closed, the control begins the prepurge time. If flame is present any time while in prepurge, the prepurge time is restarted. If flame is present long enough to cause lockout, the control responds as defined in “Fault Modes, Undesired Flame”.
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Page 21: Continuous Fan Operation
Continuous Fan Operation Fault Modes If flame is not established on the fourth trial for ignition (initial try plus 3 re-tries), the control de-energizes the gas valve and goes into lockout. The control goes to one flash on the green LED to indicate ignition failure lockout. Limit Switch Operation - The limit switch is ignored unless a call for heat is present (W energized). -
Page 22: Gas Valve
20. Ignition System (cont’d) Fault Modes (cont’d) Lockout 21. Gas Valve 22. Fan Motor Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 22 If the gas valve was sensed as closed when it should be open, and has not de- energized after the venter motor was shutoff for 15 seconds, then the venter motor is re-energized to vent the unburned gas. -
Page 23: Wiring Diagrams
23. Wiring Diagrams FIGURE 15A - Typical Wiring Diagram for Model UDAP or Model UDAS, Single Stage Form RZ-NA I-UDA, Mfg #195673 Rev 5, Page 23... - Page 24 23. Wiring Diagrams (cont’d) FIGURE 15B - Typical Wiring Diagram for Model UDAP or Model UDAS, Single Stage with Optional Air Recirculation Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 24...
- Page 25 FIGURE 15C - Typical Wiring Diagram for Model UDAP or Model UDAS, Two Stage Gas Valve Form RZ-NA I-UDA, Mfg #195673 Rev 5, Page 25...
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Page 26: Startup
24. Check Installation and Startup Check the installation prior to startup: Heater Startup: Operating Instructions and Operating Sequence Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 26 o Check to be sure that all screws used to hold shipping brackets were re- installed in the heater cabinet. -
Page 27: Check Installation After Startup
4) Turn the gas control knob clockwise to "OFF". Do not force. 5) Close the access door. o Vent System Testing Procedure - Model UDAP 1. Seal any unused openings in the venting system. 2. Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code, ANSI Z223.1 or CAN/CGA B149.1 and... -
Page 28: Maintenance Schedule
NEVER RESTRICT OR OTHERWISE ALTER THE SUPPLY OF COMBUSTION AIR TO ANY HEATER. Model UDAP units installed in a confined space must be supplied with air for combustion as required by Code and in Paragraph 9 of this heater installation manual. -
Page 29: Burner Removal
FIGURE 17.) FIGURE 17 - Burner Removal (UDAP illustrated; same process for both UDAP and UDAS) CORE This heater is equipped with a Remove any external dirt or dust accumulation. Visually check the heat exchanger for cracks and holes. If a crack or hole is observed, replace the heat exchanger. -
Page 30: Burner Orifice
27. Burner Maintenance (cont’d) Burner Removal (cont’d) Inspect and Clean the Burner Re-Install the Burner 28. Burner Orifice Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 30 size. Each baffle is held in place by one screw. For re-assembly, on the secondary air shield, mark the location (top and bottom) of each baffle. - Page 31 FIGURE 18 - Location of Controls 29. Ignition System FIGURE 19 - DSI Integrated Control Module (Circuit Board) DSI Integrated Control Module (circuit board) - See FIGURE 19. The module monitors the operation of the heater including ignition. The only replaceable com- ponent is the 3 amp Type ATC or ATO fuse.
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Page 32: Venter Motor
29. Ignition System (cont’d) Ignitor Flame Sensor 30. Fan Motor, Fan Blades, and Guard FIGURE 21 - Fan Blade Position on the Shaft Dimension A Size inches mm 9/16 Blade 1-1/2 38 2-1/8 54 2-3/8 60 125 2-5/16 59 2-3/8 60 2-1/8 54 1-5/8 67 225,... -
Page 33: Transformer
FIGURE 22 - Venter Wheel Position on Shaft Venter Motor Plate Venter Wheel, Sizes 30-75 5/16” (8mm) inside 32. Operating Gas Valve WARNING: The operating valve is the prime safety shutoff. All gas supply lines must be free of dirt or scale before connecting to the unit to ensure positive closure. -
Page 34: Troubleshooting
37. Flame Rollout Switch - Sizes 30-125 only For location, see FIGURE 18, page 31. 38. Disconnect Switch - UDAS only 39. Vent or Vent/ Combustion Air System 40. Troubleshooting DSI Integrated Control Module (Circuit Board) Trial Troubleshooting Flowchart Is there minimum flame current at the flame sensor? Is there... -
Page 35: General Troubleshooting
Check the Lights on the DSI Integrated Control Module (Circuit Board) IMPORTANT: When using a multimeter to troubleshoot the 24 volt circuit, place the meter’s test leads into the 5 or 9 pin connectors located on the ignition control. Do not remove connectors or terminals from the electrical components. -
Page 36: Troubleshooting
40. Troubleshooting (cont’d) PROBLEM (cont’d) PROBABLE CAUSE (cont’d) 10. Integrated circuit board does not power Burner will not light main valve. (cont’d) a) Loose wire connections. b) Flame sensor grounded. c) Incorrect gas pressure. d) Cracked ceramic at sensor. 1. Gas pressure too high or too low. Burner cycle on and off 2.
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