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INSTALLATION INSTRUCTIONS AND PARTS IDENTIFICATION
HIGH EFFICIENCY GAS-FIRED PROPELLER UNIT HEATERS
ATTENTION: READ THIS MANUAL AND ALL LABELS ATTACHED TO THE UNIT CAREFULLY BEFORE ATTEMPTING
TO INSTALL, OPERATE OR SERVICE THESE UNITS! CHECK UNIT DATA PLATE FOR TYPE OF GAS AND
ELECTRICAL SPECIFICATIONS AND MAKE CERTAIN THAT THESE AGREE WITH THOSE AT THE POINT OF
INSTALLATION. RECORD THE UNIT MODEL AND SERIAL No. (s) IN THE SPACE PROVIDED. RETAIN FOR FUTURE
REFERENCE.
Unit No.
The use and storage of gasoline or other flammable vapors and liquids in open containers in
the vicinity of this appliance is hazardous.
can cause property damage, injury, or death. Read the installation, operating, and
maintenance instruction thoroughly before installing or servicing this equipment.
instructions to avoid exposure to fuel substances, or substances from incomplete
combustion, which can cause death or serious illness. The state of California
has determined that these substances may cause cancer, birth defects, or other
reproductive harm.
Installer Please Note: This equipment has been test fired and inspected. It has been
shipped free from defects from our factory. However, shipment and installation problems
such as loose wires, leaks, or loose fasteners may occur. It is the installer's responsibility to
inspect and correct any problem that may be found.
RECEIVING INSTRUCTIONS
Inspect shipment immediately when
received to determine if any damage
has occurred to the unit during
shipment. After the unit has been
uncrated, check for any visible
damage to the unit. If any damage is
found, the consignee should sign the
bill of lading indicating such damage
and immediately file claim for damage
with the transportation company.
09/17
If you smell gas:
1. Open windows.
2. Don't touch electrical switches.
3. Extinguish any open flame.
4. Immediately contact your gas supplier.
Improper installation, adjustment, alteration, service, or maintenance
APPROVED FOR USE IN CALIFORNIA
APPROVED FOR USE IN CALIFORNIA
Install, operate, and maintain unit in accordance with the manufacturer's
INSTALLER'S RESPONSIBILITY
Serial No.
FOR YOUR SAFETY
FOR YOUR SAFETY
260 NORTH ELM ST., WESTFIELD, MA 01085
TEL: (413) 564-5540
NXIM-2
J30-09590
FAX: (413) 562-5311
www.mestek.com
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Summary of Contents for Mestek NXIM-2
- Page 1 NXIM-2 J30-09590 INSTALLATION INSTRUCTIONS AND PARTS IDENTIFICATION HIGH EFFICIENCY GAS-FIRED PROPELLER UNIT HEATERS ATTENTION: READ THIS MANUAL AND ALL LABELS ATTACHED TO THE UNIT CAREFULLY BEFORE ATTEMPTING TO INSTALL, OPERATE OR SERVICE THESE UNITS! CHECK UNIT DATA PLATE FOR TYPE OF GAS AND ELECTRICAL SPECIFICATIONS AND MAKE CERTAIN THAT THESE AGREE WITH THOSE AT THE POINT OF INSTALLATION.
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Page 2: Table Of Contents
TABLE OF CONTENTS DESCRIPTION ............. 2 SEPARATED COMBUSTION – GENERAL SAFETY INFORMATION ......3 TWO PIPE VENTING ..........18-19 Installation Codes ............3 SEPARATED COMBUSTION – Special Precautions ............ 3 CONCENTRIC VENTING ........... 20 SPECIFICATIONS ............4 Horizontal Sidewall Mounting ......20-22 Performance &... -
Page 3: General Safety Information
GENERAL SAFETY INFORMATION Failure to comply with the general Do not attempt to convert the safety information may result in extensive heater for use with a fuel other than the one property damage, severe personal injury, or intended unless using a factory provided death. -
Page 4: Specifications
SPECIFICATIONS Figure 2 - Dimensional Drawing – High Efficiency Unit Heater "L" CONNECTION "D" CONNECTION "T" FLUE "P" "E" "G" "H" "J" "A" "C" "U" "W" "B" "N" "K" CAT-10081B... - Page 5 Table 1 - Performance and Dimensional Data - High Efficiency Unit Heater Unit Capacity (MBH) PERFORMANCE DATA† Input - BTU/Hr. 100,000 200,000 300,000 400,000 (kW) (29.3) (58.6) (87.9) (117.2) Output - BTU/Hr. 96,000 192,000 285,000 384,000 (kW) (28.1) (56.3) (83.5) (112.5) Thermal Efficiency Free Air Delivery -...
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Page 6: Installation
INSTALLATION AIR FOR COMBUSTION: The unit heater shall be Do not install unit heaters in corrosive or flammable atmospheres! Premature installed in a location in which the facilities for failure of, or severe damage to the unit will result! ventilation permit satisfactory combustion of gas, proper venting, and the maintenance of ambient air at safe limits under normal conditions of use. -
Page 7: Suspension Of Units
INSTALLATION (continued) Make sure that the structure Ensure that all hardware used in to which the unit heater is to be mounted is the suspension of each unit heater is more than capable of safely supporting its weight. Under adequate for the job. Failure to do so may result in no circumstances must the gas lines, the venting extensive property damage, severe personal injury, system or the electrical conduit be used to support... - Page 8 Figure 3C - Heater Mounting: Steel Construction (for all sizes) Figure 3D - Heater Mounting: Wood Construction Joists (for sizes 100/200) WASHER JOIST & NUT 2" X 6" LAG BOLTED ACROSS JOISTS LAG BOLT 3/8'' THREADED & WASHER THREADED INSERT UNIT HEATER CAT-10065A 100/200 SIZES...
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Page 9: Installation - Gas Piping
INSTALLATION – GAS PIPING 200,000 BTU/Hr To avoid damage or possible = 200 Cu. ft./hr. 1,000 BTU/cu. ft. personal injury, do not connect gas piping to Using Table 2, a 1 inch pipe is needed. this unit until a supply line pressure/leak test has been completed. -
Page 10: Pipe Installation
INSTALLATION – GAS PIPING (continued) PIPE INSTALLATION NOTICE: Use pipe joint sealant resistant to the action of liquefied petroleum gases regardless of gas conducted. 1. Install the gas piping in accordance with applicable local codes. 2. A field provided lock-up type high pressure regulator Check all pipe joints for leakage must be used to limit the supply pressure to a using a soap solution or other approved method. -
Page 11: Electrical Connections
ELECTRICAL CONNECTIONS 1. Cold Areas - Outside walls or areas where drafts may affect the operation of the control. HAZARDOUS VOLTAGE! 2. Hot Areas - Areas where the sun's rays, radiation, or warm air currents may affect the operation of the DISCONNECT ALL ELECTRIC control. -
Page 12: Unit Wiring Diagrams
ELECTRICAL CONNECTIONS (continued) Figure 7A – Unit Wiring Diagram, High Efficiency Unit Heater Size 100, Equipped with Natural or Propane (LP) Gas, Modulating with Outside Air Reset (Master) - Page 13 ELECTRICAL CONNECTIONS (continued) Figure 7B – Unit Wiring Diagram, High Efficiency Unit Heater Size 200, Equipped with Natural or Propane (LP) Gas, Modulating with Outside Air Reset (Master)
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Page 14: Unit Wiring Diagrams
ELECTRICAL CONNECTIONS (continued) Figure 7C – Unit Wiring Diagram, High Efficiency Unit Heater Size 300/400, Equipped with Natural or Propane (LP) Gas, Modulating with Outside Air Reset (Master) -
Page 15: Venting - General Guidelines
VENTING – GENERAL GUIDELINES Category I Category IV ANSI now organizes vented appliances into four categories. Includes non-condensing appliances Covers condensing appliances with with negative vent pressure, like the positive vent pressure. Venting Categories traditional atmospheric unit heater. NOTICE: Category I, II and III do Non- Category II Condensing... -
Page 16: Standard Combustion - Horizontally Vented (Cat. Iv)
STANDARD COMBUSTION – HORIZONTALLY VENTED UNIT HEATERS (CATEGORY IV) 5. The vent system must be installed to prevent This appliance uses a positive collection of condensate. Pitch horizontal pipes pressure venting system. All joints must be downward 1/4 inch per foot (21 mm/m) toward the sealed completely to prevent leakage of flue unit for condensate drainage. -
Page 17: Standard Combustion - Vertically Vented (Cat. Iv)
STANDARD COMBUSTION – VERTICALLY VENTED UNIT HEATERS (CATEGORY IV) 4. Vent system terminations for these appliances shall This appliance uses a positive NOT terminate in an area where the condensate pressure venting system. All joints must be or vapor could create a nuisance or hazard or sealed completely to prevent leakage of flue could be detrimental to the operation of regulators, products into occupied spaces. -
Page 18: Separated Combustion - Two Pipe Venting
SEPARATED COMBUSTION – TWO PIPE VENTING NOTE: For non-concentric venting (two wall or two roof penetrations, one for combustion air and a second for flue pipe), follow the instructions below. For concentric venting (single wall or roof penetration), follow the concentric venting instructions in SEPARATED COMBUSTION –... - Page 19 Figure 10 - Vertical Two Pipe Separated Combustion Venting, Roof Termination 24" (610 mm) MINIMUM FROM ADJACENT WALL OR BUILDING TO COMBUSTION 4.5" MINIMUM AIR INLET TERMINAL (115 mm) 4.5" MINIMUM (115 mm) 8" MINIMUM ROOF FLASHING (204 mm) REQUIRED AT ALL PENETRATIONS THROUGH THE ROOF...
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Page 20: Separated Combustion - Concentric Venting
SEPARATED COMBUSTION – CONCENTRIC VENTING NOTICE: Every Separated Combustion unit to be installed MUST use the factory-available Concentric Vent Kit. If you do not have this kit, contact the manufacturer ASAP to obtain one prior to installation. AIR INLET COLLAR When the unit is to be used in a separated vent system, In Canada, construct all combustion air and vent pipes the inlet collar located on the top panel of the unit will... - Page 21 SEPARATED COMBUSTION – CONCENTRIC VENTING (continued) 4. Cut a hole for Concentric Vent kit. Figure 15 - Horizontal Sidewall Concentric Venting, a. Cut a 4 inch (102 mm) diameter hole for size 100 Single Termination unit, 2 inch (51 mm) concentric vent kit. b.
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Page 22: Vertical Roof Mounting
SEPARATED COMBUSTION – CONCENTRIC VENTING (continued) NOTE: Keep assembly free of insulation during installation. Figure 18 - Vertical Concentric Vent Kit Installation NOTE: Maintain clearance dimensions as shown in MAINTAIN 12" (305 mm) MINIMUM MAINTAIN 12" (305 mm) MINIMUM Figures 15, 16 and 17. Also refer to Table 4 for vent (18"... -
Page 23: Gas Conversion
GAS CONVERSION REPLACE THE ORIFICES (see Figure 20) This conversion kit shall be installed 6. Remove the four screws holding the access panel by a qualified service agency in accordance with and remove the panel. the manufacturer's instructions and all applicable codes and requirements of the authority having 7. - Page 24 GAS CONVERSION Figure 21A – Gas Valve Adjustment Locations Figure 21B – Gas Valve Adjustment Location (Sizes 100/200) (Sizes 300/400) Low Fire Adjustment High Fire Adjustment Figure 21C – Run% Potentiometer on Control Board Run % Potentiometer...
- Page 25 GAS CONVERSION 14. Turn the set screw open to the number of turns listed Table 8 - CO Operation Range in Table 7. Unit Size High Fire - CO Range Low Fire - CO Range a. For Propane (LP) Gas units: (MBH) Natural gas Propane Gas...
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Page 26: Operation
OPERATION – HIGH EFFICIENCY PROPELLER UNITS DIRECT SPARK IGNITION EXPLANATION OF CONTROLS: c. Thermostat Operation, Networked: A thermostat 1. The unit heater is equipped with a power vent will determine how all units run. A Fan Only system that consists of a combustion motor and (G) demand will cause the Master to run its blower, power venter motor and blower, pressure propeller fan only. - Page 27 OPERATION – HIGH EFFICIENCY PROPELLER UNITS DIRECT SPARK IGNITION (continued) II. OA Reset Networked, Global enable • The OA DIP Switch must be ON for all Members. Similar to OA Reset standalone, a W1 call will • All units must be connected using the cause the Master to run at an input determined Network communication ports.
- Page 28 OPERATION – HIGH EFFICIENCY PROPELLER UNITS DIRECT SPARK IGNITION (continued) Space Temperature Operation: The unit Note – If the broadcast input level is below will modulate from 100% fire to the minimum any Member’s RUN potentiometer setting, input set by the Run potentiometer (Run %) that Member will run at its Run potentiometer in order to maintain the setpoint of the space setting.
- Page 29 OPERATION – HIGH EFFICIENCY PROPELLER UNITS DIRECT SPARK IGNITION (continued) h. Modbus Control: The operation of the unit can Figure 22 - Control Board, Mode Dip Switches be controlled by remote Modbus commands over RS485. See the Modbus Register list (Appendix A) for more information.
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Page 30: Start-Up
OPERATION – HIGH EFFICIENCY PROPELLER UNITS DIRECT SPARK IGNITION (continued) 7. The high limit switch interrupts the flow of electrical 6. Set (Run %) potentiometer to 100% on the control board current to the ignition control and gas valve, to force the unit to high fire. Turn clockwise (100). interrupting the flow of gas to the gas burner if the unit heater becomes overheated. -
Page 31: Gas Input Rate
GAS INPUT RATE Check the gas input rate as follows (Refer to NOTICE: See Table 6 for gas orifice sizes. GENERAL SAFETY INFORMATION section for metric HIGH EFFICIENCY UNIT HEATER – HIGH ALTITUDE conversions): DERATION This high efficiency unit heater has been manufactured Never over-fire the unit heater, as this utilizing standard burner orifices and gas pressure setting may cause unsatisfactory operation, or shorten the... -
Page 32: Pneumatic Tubing Schematic
PNEUMATIC TUBING TROUBLE SHOOTING SCHEMATIC Figure 24 - Pneumatic Tubing Schematic Ø 3/16" TUBING TO POWER VENTER PRESSURE SWITCH, HIGH PRESSURE TAP CAP, FLEX, 3/16"-1/4" OD. TEE, 1/8" X 1/8" X 1/4" ID Ø 1/8" TUBING TEE, 1/8" X 1/8" X 1/4" ID TO PRESSURE TRANSDUCER Ø... -
Page 33: Unit Troubleshooting Guide
HIGH EFFICIENCY GAS-FIRED UNIT HEATER TROUBLESHOOTING GUIDE SYMPTOMS POSSIBLE CAUSE(S) CORRECTIVE ACTION A. Yellow tip flame (some 1. Clogged air inlet filter. 1. Clean filter. yellow tipping on LP 2. Clogged main burners. 2. Clean mesh burner. gas is permissible). 3. - Page 34 SYMPTOMS POSSIBLE CAUSE(S) CORRECTIVE ACTION K. Fan will not stop. 1. Control Board is in flame failure mode. 1. Turn 115V power off to the unit, wait 10 seconds and reapply voltage to the unit. 2. Fan improperly wired. 2. Check wiring of fan circuit to wiring diagram. 3.
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Page 35: Led Troubleshooting Guide
HIGH EFFICIENCY GAS-FIRED UNIT HEATER TROUBLESHOOTING WITH LED INDICATOR ASSISTANCE No Cycling or appliance power or thermostat call for heat since appliance failure has occured. Line voltage power can cause product damage, severe injury or death. Only a trained experienced service technician should perform this trouble-shooting. -
Page 36: Maintenance
MAINTENANCE PERIODIC SERVICE Should maintenance be required, perform the following NOTICE: The heater and vent system should be inspection and service routine: checked once a year by a qualified technician. 1. Inspect the area near the unit to be sure that there is All Maintenance/Service information should be recorded no combustible material located within the minimum accordingly on the GAS EQUIPMENT START-UP AND... -
Page 37: Warranty
LIMITED WARRANTY High Efficiency Propeller Unit Heaters 1. The "Manufacturer" warrants to the original owner at original installation site that the above model Gas-Fired Heater ("the Product") will be free from defects in material or workmanship for (1) year from the date of shipment from the factory, or one and one-half (1-1/2) years from the date of manufacture, whichever occurs first. -
Page 38: Identification Of Parts
IDENTIFICATION OF PARTS Figure 25 - Component Access CAT-10089A Figure 26 - Flue Collector/Drafter Assembly Figure 27 - Air Gas Inlet Assembly MACHINE SCREW, #6-32 FLUE COLLECTOR ASSEMBLY AIR-GAS INLET COVER PLATE INLET AIR DISTRIBUTOR FLUE COLLECTOR GASKET HEX NUT, MACHINE SCREW, (3) M4x6 &... -
Page 39: Replacement Parts
Figure 28 - Heat Exchanger Components COIL ASSEMBLY COMBUSTION TUBE TURBULATOR COMBUSTION VESTIBULE PANEL CAT-10086B TURN VESTIBULE PANEL TURN COVER GASKET TURN COVER Figure 29 - Propeller Motor/Fan Assembly FAN BLADE OSHA FAN GUARD PLATE OSHA FAN GUARD HARDWARE RUBBER GROMMET HARDWARE CAT-10079A MOTOR... -
Page 40: Appendix A - Modbus Registers
APPENDIX A – MODBUS REGISTERS Input/Output Variables (Read/Write) Address Name Raw Data Type Scale Description Valid Values/Range This Modbus Address is used if the Communications settings 40001 Modbus Address 8 bit unsigned – 1 - 247 location DIP is set to Memory 0 = 1200 1 = 2400 2 = 4800... - Page 41 Input Variables (Read Only) Address Name Raw Data Type Scale Description Valid Values/Range Outside air temperature -40 – 250°F 30001 Outside Temperature 16 bit unsigned * optional -52°F if not installed Space temperature -40 – 250°F 30002 Space Temperature 16 bit unsigned -52°F if not installed * optional Stratification temperature...
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Page 42: Unit Number Description
HIGH EFFICIENCY GAS-FIRED UNIT HEATER UNIT NUMBER DESCRIPTION DIGIT – 10 11 12 13 14 15 ITEM PREFIX FT FM GT AL GC SV MT MS DL (Internal Use Only) 1, 2 - Unit Type [UT] 12 - Motor Type [MT] HU - High Efficiency Unit Heater 1 - Open Drip Proof 3, 4, 5 - Capacity [CA]... -
Page 43: Start-Up And Inspection Sheet
GAS EQUIPMENT START-UP AND INSPECTION SHEET Customer ____________________________________ Job Name & Number _________________________ PRE-INSPECTION INFORMATION With power and gas off. Type of Equip: Unit Heater Serial Number _________________________ Model Number __________________________ Name Plate Voltage: _____________ Name Plate Amperage: _____________ Type of Gas: Natural Tank Capacity _______ lbs. - Page 44 260 NORTH ELM ST., WESTFIELD, MA 01085 TEL: (413) 564-5540 FAX: (413) 562-5311 www.mestek.com...
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