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INSTALLATION INSTRUCTIONS AND PARTS IDENTIFICATION
XH/BXH 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.
05/2024
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
HXIM-1
J30-10655
TEL: (413) 564-5540
www.mestek.com
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Summary of Contents for Mestek XH
- Page 1 J30-10655 INSTALLATION INSTRUCTIONS AND PARTS IDENTIFICATION XH/BXH 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 STANDARD COMBUSTION – GENERAL SAFETY INFORMATION ......3 VERTICALLY VENTED (CAT. IV) ....... 20 Installation Codes ............3 SEPARATED COMBUSTION – Special Precautions ............ 3 TWO PIPE VENTING ..........21-22 SPECIFICATIONS ............4 SEPARATED COMBUSTION – 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 Gas-Fired Propeller Unit Heater "G" "D" "B" "F" CONDENSATE DRAIN "J" "A" OPENING "R" "E" "P" "H" OPENING Bottom View Front View "C" 37-1/4" (945mm) ELECTRICAL CONNECTION "K" 36-3/16" (918mm) COMBUSTION AIR LED INDICATOR FLUE "L"... - Page 5 Table 1 - Performance and Dimensional Data - High Efficiency Unit Heater Unit Capacity (MBH) PERFORMANCE DATA† Input Maximum - BTU/Hr. 50,000 100,000 150,000 200,000 250,000 300,000 350,000 400,000 (kW) (14.6) (29.3) (43.9) (58.6) (73.2) (87.9) (102.5) (117.2) Output - BTU/Hr.
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Page 6: Installation
INSTALLATION Do not install unit heaters in In Canada, installation must be in accordance with the latest corrosive or flammable atmospheres! Premature edition of CSA B149 “Installation Codes for Gas Burning failure of, or severe damage to the unit will result! Appliances and Equipment.”... - Page 7 Table 2 - Heat Throw Data “ZH” “H” “X” “Y” “Z” Notes: 1. All throw data figures are approximations. Allowances should be made for optimum performance, altitude, etc. 2. "NR" - Units are not recommended at these mounting heights. 3. Heat throw figures were determined with all unit louvers set to a 45 degree angle. 4.
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Page 8: Clearances
CLEARANCES: Each Gas Unit Heater shall be Make sure that the structure located with respect to building construction and other to which the unit heater is to be mounted is equipment so as to permit access to the Unit Heater. capable of safely supporting its weight. - Page 9 Figure 3B - High Efficiency Unit Heater Suspension (for sizes 250/400) CAT-10748A Figure 3C - Heater Mounting: Steel Construction (for all sizes)
- Page 10 Figure 3D - Heater Mounting: Wood Construction Joists (for sizes 50/200) WASHER JOIST & NUT 2" X 6" LAG BOLTED ACROSS JOISTS LAG BOLT 3/8'' THREADED & WASHER THREADED INSERT UNIT HEATER CAT-10065B 50/200 SIZES Figure 3E - Heater Mounting: Wood Construction Joists (for sizes 250/400) NUT &...
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Page 11: 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 4, a 1 inch pipe is needed. this unit until a supply line pressure/leak test has been completed. -
Page 12: 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 13: Installation - Condensate Piping
INSTALLATION – CONDENSATE PIPING The condensate trap provided with Do not use thread sealing tape in the unit must be installed. The condensate trap is lieu of thread sealant. Parts of the thread sealing designed to provide backpressure for the correct tape may break off and prevent the condensate trap operation of the unit. -
Page 14: Electrical Connections
ELECTRICAL CONNECTIONS diagram, and wire accordingly. Avoid mounting the thermostat in the following locations: 1. Cold Areas - Outside walls or areas where drafts HAZARDOUS VOLTAGE! may affect the operation of the control. DISCONNECT ALL ELECTRIC 2. Hot Areas - Areas where the sun's rays, radiation, POWER INCLUDING REMOTE or warm air currents may affect the operation of the DISCONNECTS BEFORE... - Page 15 ELECTRICAL CONNECTIONS (continued) Figure 7A – Unit Wiring Diagram, High Efficiency Gas-Fired Propeller Unit Heater Size 50, Equipped with Natural Gas or Propane (LP) Gas, Single Stage...
- Page 16 ELECTRICAL CONNECTIONS (continued) Figure 7B – Unit Wiring Diagram, High Efficiency Gas-Fired Propeller Unit Heater Size 100, Equipped with Natural Gas or Propane (LP) Gas, Single Stage...
- Page 17 ELECTRICAL CONNECTIONS (continued) Figure 7C – Unit Wiring Diagram, High Efficiency Gas-Fired Propeller Unit Heater Size 150, Equipped with Natural Gas or Propane (LP) Gas, Single Stage...
- Page 18 ELECTRICAL CONNECTIONS (continued) Figure 7D – Unit Wiring Diagram, High Efficiency Gas-Fired Propeller Unit Heater Size 200, Equipped with Natural Gas or Propane (LP) Gas, Single Stage...
- Page 19 ELECTRICAL CONNECTIONS (continued) Figure 7E – Unit Wiring Diagram, High Efficiency Gas-Fired Propeller Unit Heater Sizes 250/400, Equipped with Natural Gas or Propane (LP) Gas, Single Stage...
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Page 20: Venting - General Guidelines
VENTING – GENERAL GUIDELINES ANSI now organizes vented Category I Category IV 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- Condensing Condensing... - Page 21 VENTING – GENERAL GUIDELINES Table 6 - Vent Systems Termination Clearance Requirements Minimum Clearance for Termination Locations Structure/Object CANADA Door, window, or gravity vent inlet; 9 in. for 10,000 to 50,000 BTU/Hr input; 12 in. for input 9 in. (230mm) for 10,000 to 50,000 BTU/Hr input; 12 in. combustion air inlet for other appliances exceeding 50,000 BTU/Hr.
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Page 22: Standard Combustion - Horizontally Vented (Cat. Iv)
STANDARD COMBUSTION – HORIZONTALLY VENTED UNIT HEATERS (CATEGORY IV) 5. Vent shall be terminated with a 90 degree elbow or This appliance uses a positive tee. The vent terminal must be at least 12 inches (305 pressure venting system. All joints must be mm) from the exterior of the wall that it passes through sealed completely to prevent leakage of flue to prevent degradation of the building material by flue... -
Page 23: Standard Combustion - Vertically Vented (Cat. Iv)
STANDARD COMBUSTION – VERTICALLY VENTED UNIT HEATERS (CATEGORY IV) 4. Vent shall be terminated with a 180 degree elbow This appliance uses a positive or two 90 degree elbows. Vent system terminations pressure venting system. All joints must be for these appliances shall NOT terminate in an sealed completely to prevent leakage of flue area where the condensate or vapor could create products into occupied spaces. -
Page 24: 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 25 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 26: 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 In Canada, construct all combustion air and vent pipes When the unit is to be used in a separated vent system, for this unit of CSA or ULC certified Schedule 40 PVC,... - Page 27 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 50 Single Termination - 100 unit, 2 inch (51 mm) concentric vent kit. b.
- Page 28 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 Figures15, 16, and 17. Also refer to Table 6 for vent (18"...
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Page 29: Operation
OPERATION – HIGH EFFICIENCY GAS-FIRED PROPELLER UNITS DIRECT SPARK IGNITION EXPLANATION OF CONTROLS: 8. The float switch interrupts the flow of electric current 1. The unit heater is equipped with a power vent to the ignition control and gas valve, interrupting the system that consists of a power venter motor and flow of gas to the gas burner if the condensate is blower, pressure switches, and sealed flue collector. -
Page 30: Shut Down
OPERATION – HIGH EFFICIENCY GAS-FIRED PROPELLER UNITS DIRECT SPARK IGNITION (continued) SHUT DOWN 6. Turn the thermostat to the lowest point and determine that the power venter motors shut off and the burners 1. Turn the valve selector lever to the “OFF” position. are extinguished. -
Page 31: Gas Input Rate
GAS INPUT RATE Check the gas input rate as follows (Refer to 2. PROPANE GAS: A high fire manifold pressure of 10.0 in. W.C. (2.5 kPa) must be maintained for proper GENERAL SAFETY INFORMATION section for metric operation of the unit heater. Follow steps "a" through conversions): "e"... -
Page 32: High Altitude Deration
HIGH ALTITUDE DERATION This unit heater has been manufactured utilizing adjustment label to the unit, and record adjusted standard burner orifices and gas pressure setting as manifold pressure, altitude of the unit installation and per the specifications shown on the unit rating plate. the technician’s name and date on the label using a permanent marker. - Page 33 HIGH EFFICIENCY GAS-FIRED UNIT HEATER TROUBLESHOOTING GUIDE SYMPTOMS POSSIBLE CAUSE(S) CORRECTIVE ACTION 1. Flame pops back. 1. Burner orifice too small. 1. Refer to GAS INPUT RATE, Main Burner Orifice Schedule. Check with local gas supplier for proper orifice size and replace.
- Page 34 SYMPTOMS POSSIBLE CAUSE(S) CORRECTIVE ACTION 11. Fan will not run. 1. Loose electrical connections. 1. Check and tighten wires on fan circuit. 2. Defective motor or overload. 2. Test for 115V on terminal ACC1 and “L2” if voltage is present replace motor. 3.
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Page 35: Main Ignition Board Flash Codes
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 occurred. Line voltage power can cause product damage, severe injury or death. Only a trained experienced service technician should perform this troubleshooting. -
Page 36: Maintenance
MAINTENANCE PERIODIC SERVICE 3. To clean or replace the burners, remove burner NOTICE: The heater and vent system should be side access panel. Disconnect field supplied union checked once a year by a qualified technician. before unit gas connection. Remove screws holding manifold in place and rotate out of the way. -
Page 37: Warranty
LIMITED WARRANTY High Efficiency Gas-Fired 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 21 - Heat Exchanger COMBUSTION VESTIBULE PANEL TUBE ASSEMBLY COIL ASSEMBLY TURN VESTIBULE PANEL TURBULATOR TURN COVER GASKET TURN COVER CAT-10751A Figure 22 - Propeller Motor/Fan Assembly FAN BLADE OSHA FAN GUARD PLATE OSHA FAN GUARD HARDWARE RUBBER GROMMET HARDWARE... -
Page 39: Terminal Block
Figure 24 - Power Venter Assembly Figure 25 - Direct Spark Ignition System FLUE COLLECTOR ASSEMBLY BURNER BRACKET FLAME SENSOR FLUE COLLECTOR GASKET DRAFTER MOUNTING PLATE ORIFICE SELF-DRILL SCREW, #8-18 BURNER INDUCER MANIFOLD SPARK IGNITOR THREADED HEX INSERT, #10-24 DRAFTER GASKET GAS VALVE CAT-10755A CAT-10085A... -
Page 40: Unit Number Description
FT FM GT AL GC SV MT MS DL (Internal Use Only) 1, 2 - Unit Type [UT] 12 - Motor Type [MT] XH/BXH - High Efficiency Gas-Fired Propeller Unit Heater 1 - Open Drip Proof 3, 4, 5 - Capacity [CA] 13 - Blower Motor Sizes [MS]... -
Page 41: 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 www.mestek.com...
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