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Series Fan-Type
Unit Heaters
Installation/Operation FORM RZ-NA I-UDA
APPLIES TO: Models UDAP and UDAS
Table of Contents
Page
FOR YOUR SAFETY
Warnings ........................................ 1
What to do if you smell gas:
Installation/Operation .............. 2-25
• Do not try to light any appliance.
Check/Test/Startup ................. 26-28
Maintenance/Service .............. 28-36
Do not touch any electrical switch; do not use any phone in
your building.
Index (by page)
Bu
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Hazard Levels of HAZARD INTENSITY LEVELS 1. DANGER: Failure to comply will result in severe personal injury or Warnings in this death and/or property damage. Manual 2. WARNING: Failure to comply could result in severe personal injury or death and/or property damage. 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 1. General Canadian Standards Association for use in residential, i
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Installations in aircraft hangars should be in accordance with ANSI/NFPA No. 409 Special Installations (latest edition), Standard for Aircraft Hangars; in public garages in accordance (Aircraft Hangars/ with ANSI/NFPA No. 88A (latest edition), Standard for Parking Structures; and Repair Garages/ for repair garages in accordance with ANSI/NFPA No. 88B (latest edition), Stan- dard for Repair Garages. In Canada, installations in aircraft hangars should be in Parking Garages) accordance with the req
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5. Dimensions
FIGURE 1 - Model UDAP, Power Vented Fan Model
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FIGURE 3 - Model UDAS, Separated Combustion Fan
Model
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6. Technical Data (Data applies to both Models UDAP and UDAS unless noted otherwise.) TECHNICAL DATA - Sizes 30 - 125 Size 30 45 60 75 100 125 BTUH 30,000 45,000 60,000 75,000 105,000 120,000 Input Heating Capacity kw 8.8 13.2 17.6 22.0 30.8 35.2 Thermal Efficiency (%) 828383838383 A BTUH 24,600 37,350 49,800 62,250 87,150 99,600 Output Heating Capacity kw 7.2 11.0 14.6 18.3 25.6 29.2 Natural 1/2 1/2 1/2 1/2 1/2 1/2 B Gas Connection (inches) Propane 1/2 1/2 1/2 1/2 1/2 1/2 C Vent Connection
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If the heater is being installed at an elevation above 2000 ft (610M), the input rate 7. High Altitude will have to be derated. This is done by adjusting the valve outlet pressure. Operation In addition, if the heater is being installed at an altitude above 6000 ft (1830M), the pressure switch will have to be changed. If ordered with the unit as Option DJ20 or DJ21, the pressure switch is shipped separately. Gas valve adjustment for Adjusting the valve outlet pressure is done after the heater is
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This heater must be supplied with the air that enters into the combustion process 9. Combustion and is then vented to the outdoors. Sufficient air must enter the equipment location Air - applies to to replace that exhausted through the heater vent system. In the past, the infiltra- tion of outside air assumed in heat loss calculations (one air change per hour) was Model UDAP assumed to be sufficient. However, current construction methods using more insu- lation, vapor barriers, tighter fitting a
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Use the sound data in Paragraph 6, clearances in Paragraph 8; the combustion air 10. Unit Heater requirements in Paragraph 9; the throw tables, mounting height requirements, and location recommendations below; the weights in Paragraph 11; and the venting Location requirements in the Venting Manual to determine where to suspend the heater. Heater Throw %$
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FIGURE 6 - Throw for Fan Models UDAP and UDAS NOTE: Throws listed are wit
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For best results, the heater should be placed with certain rules in mind. In general, 10. Unit Heater a unit should be located from 8 to 12 feet (2.4-3.7M) above the floor. Units should Location always be arranged to blow toward or along exposed wall surfaces, if possible. Where two or more units are installed in the same room, a general scheme of air (cont’d) circulation should be maintained for best results. Suspended heaters are most effective when located as close to the working zone as poss
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FIGURE 7A - Suspending Be sure the threaded hanger rods the Heater with Rods from are locked to the heater as the Threaded Nut Retainers illustrated. (either two or four point ()*
suspension)
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WARNING: Unit must be level for proper Recommended maximum hanger rod length is 6 feet (1.8M). operation. Do not place or add additional weight If ordered with swivel connectors for 1” pipe, Option CK8 or CK10, at
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WARNING: This appliance is equipped for a maximum gas 12. Gas Piping supply pressure of 1/2 pound, 8 ounces, or 14 inches water column. and Supply pressure higher than 1/2 pound requires installation of Pressures an additional lockup-type service regulator external to the unit. WARNING: 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. Cap or plug the supply line. Test Pressures Below 1/2 PSI: Befor
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Leak-test all connections by brushing on a leak-detecting solution. FIGURE 10 - Gas .$ connection is at the pipe 5 6 !$ $ ,. 4
nipple that extends outside
the cabinet
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& 5 6 Measuring valve outlet
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Instructions for High Altitude Derate 12. Gas Piping 1. Determine the required valve outlet pressure for the elevation where the heater and will be operating. If unsure of the elevation, contact the local gas supplier. Valve Outlet Pressure Settings by Elevation Pressures Manifold Pressure Settings by Altitude for the UNITED STATES Altitude Natural Gas (inches w.c.) Propane Gas (inches w.c.) (cont’d) Single Stage and Two Stage Single Stage and Two Stage Feet Meters Two Stage High Fire Low Fire
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The input and/or the capacity of the heater changes with the derate. The tables High Altitude below list inputs and capacities at altitudes from sea level to 10,000 ft (3045M). Capacity Changes BTUH Inputs and Capacities by Altitude in the UNITED STATES for Model UDAP and Model UDAS Thermal Thermal Thermal Thermal Normal Minimum Normal Minimum Normal Minimum Normal Minimum ALTITUDE Output Output Output Output Input Input Input Input Input Input Input Input Capacity Capacity Capacit
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2 ® This heater has a one-piece TCORE burner assembly (patent pending) designed 13. Burner to provide controlled flame stability without lifting or flashback with either natu- ral or propane gas. The burner can be removed as a unit for inspection or service; see Maintenance Section for removal instructions. All electrical wiring and connections, including electrical grounding MUST be 14. Electrical made in accordance with the National Electric Code ANSI/NFPA No. 70 (latest edition) or, in Canada
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Make sure that the heat anticipator setting on the thermostat is 0.6 amps (or in accordance with the amperage value noted on the wiring diagram of your heater). Make thermostat connections at the terminal strip on the back of the heater. The strip has four terminals, R, G, W1, and W2; refer to the wiring diagram. FIGURE 13 - Terminal 9
4
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63'1 9
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63'/ Strip for 24-volt wiring is on the outside rear of the heater NOTE: The size of heater illustrated has a vertical ,
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The two Tables on the left below list the approximate water column negative pres- 16. Combustion 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 Air Proving water column differential pressure readings and switch setpoints for sea level op- Switch (cont’d) erating conditions for Model UDAS heaters. DANGER: Safe operation of this unit requires proper venting flow. NEVER bypass combustion ai
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All sizes of Model UDAS heaters are equipped with a door switch which prevents 19. Door Switch the heater from operating when the service door panel is open. The service panel of a Model UDAS is equipped with a pliable gasket material that fully seals the - Model door to provide added protection from building air entering the combustion zone UDAS only of the heater. (For switch location, see FIGURE 18, page 31.) This heater is equipped with a direct spark integrated control module (circuit boa
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When the pressure switch is proven closed, the control begins the prepurge time. 20. Ignition If flame is present any time while in prepurge, the prepurge time is restarted. If System flame is present long enough to cause lockout, the control responds as defined in “Fault Modes, Undesired Flame”. (cont’d) The control runs the venter motor for a 20 second prepurge time, then proceeds to the ignition trial period. Normal Heat 3) Ignition Trial Period - The control energizes the spark and main gas
