Introduction
Thank you for choosing the Master MH-150V-GFA-A LP Forced Air Heater. This powerful and versatile heater is designed to provide efficient warmth for large, well-ventilated spaces such as garages, construction sites, and workshops. This manual provides essential information for the safe and effective operation, maintenance, and troubleshooting of your heater. Please read all instructions carefully before use and retain this manual for future reference.
Figure 1: Master MH-150V-GFA-A LP Forced Air Heater, showing its robust yellow cylindrical body and black base.
Important Safety Information
WARNING: Failure to follow these instructions can result in fire, explosion, serious injury, or death. This heater is for use with propane gas only. Do not use other fuels.
- Ventilation: Always ensure adequate ventilation when operating this heater. This heater consumes oxygen and produces carbon monoxide. Use only in well-ventilated areas. Do not use in enclosed living spaces.
- Clearance: Maintain minimum clearances from combustible materials: 6 feet (1.8m) from the front, 2 feet (0.6m) from the top, and 2 feet (0.6m) from the sides and rear.
- Fuel: Use only LP (liquid propane) gas. Connect the heater only to a propane cylinder equipped with a POL valve. Ensure all gas connections are tight and leak-free before operation.
- Electrical: Connect the heater to a properly grounded 120V AC electrical outlet. Do not use extension cords unless they are rated for outdoor use and heavy-duty applications.
- Placement: Place the heater on a stable, level, non-combustible surface. Do not operate the heater near flammable liquids, vapors, or dust.
- Supervision: Never leave the heater unattended while operating. Keep children and pets away from the heater.
- Over-Heat Shut-Off: This heater is equipped with an automatic over-heat shut-off system. If the heater overheats, it will automatically turn off. Allow it to cool before attempting to restart.
Setup and Assembly
- Unpacking: Carefully remove the heater from its packaging. Inspect for any shipping damage. Report any damage immediately to your dealer.
- Placement: Position the heater on a firm, level surface, ensuring all safety clearances are met.
- Propane Connection: Connect the regulator hose assembly to a standard 20 lb. (or larger) LP gas cylinder. Hand-tighten the connection. Do not use tools to tighten the POL nut, as this may damage the connection.
- Leak Test: After connecting the propane tank, open the gas valve slowly and check all connections for leaks using a soap and water solution. Bubbles indicate a leak. If a leak is detected, close the gas valve immediately and tighten connections. Repeat the leak test. Do not operate the heater if a leak persists.
- Electrical Connection: Plug the heater's power cord into a grounded 120V AC, 60 Hz electrical outlet.
Operating Instructions
Figure 2: Close-up of the control panel with the temperature control knob and power switch.
Starting the Heater:
- Ensure the propane tank valve is fully open.
- Turn the thermostat control knob (Figure 2) to the desired temperature setting.
- Flip the power switch to the 'ON' position. The fan will start, and the igniter will attempt to light the burner.
- If the heater does not ignite within 10-15 seconds, turn the power switch to 'OFF', wait 5 minutes, and repeat the starting procedure.
Adjusting Heat Output:
The Master MH-150V-GFA-A features variable heat settings. Adjust the thermostat control knob (Figure 2) to increase or decrease the heat output as needed. The heater will cycle on and off to maintain the set temperature.
Shutting Down the Heater:
- Turn the power switch to the 'OFF' position.
- Close the valve on the propane cylinder.
- Allow the heater to cool completely before moving or storing.
Maintenance
Regular maintenance ensures optimal performance and extends the life of your heater. Always disconnect the heater from the power supply and propane tank before performing any maintenance.
- Cleaning: Keep the heater clean and free from dust and debris. Use a soft, dry cloth to wipe down exterior surfaces. Do not use abrasive cleaners or solvents.
- Air Intake/Outlet: Ensure the air intake and heat outlet areas are clear of obstructions.
- Hose and Regulator: Periodically inspect the propane hose and regulator for cuts, cracks, or damage. Replace if any damage is found.
- Storage: When not in use, store the heater in a dry, safe location, away from children and flammable materials. Disconnect the propane tank and store it separately in a well-ventilated area.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Heater does not ignite | No propane flow; No electrical power; Faulty igniter; Low gas pressure | Check propane tank level and valve; Ensure power cord is plugged in; Consult a qualified technician; Check regulator and hose. |
| Heater cycles on and off frequently | Thermostat set too high for ambient temperature; Insufficient ventilation; Over-heat shut-off activated | Lower thermostat setting; Ensure adequate ventilation; Allow heater to cool, then check for obstructions. |
| Low heat output | Low propane level; Partially closed propane valve; Incorrect thermostat setting | Refill or replace propane tank; Fully open propane valve; Adjust thermostat to a higher setting. |
| Unusual noise or odor | Gas leak; Internal component issue; Obstruction in fan | Immediately shut off heater and propane supply, check for leaks; Discontinue use and contact customer support. |
Specifications
- Brand: Master
- Model Number: MH-150V-GFA-A
- Heat Output: 150,000 BTU (Variable)
- Fuel Type: Propane (LP)
- Voltage: 120 Volts
- Product Dimensions: 26"D x 9"W x 15"H
- Item Weight: 18 pounds
- Special Feature: Portable
- Indoor/Outdoor Usage: Indoor (for well-ventilated spaces like garages/workshops)
- UPC: 657888101505
Warranty and Support
For warranty information or technical support, please refer to the warranty card included with your product or contact Master customer service directly. Keep your purchase receipt as proof of purchase for any warranty claims.
Contact Information: Please visit the official Master website or refer to your product packaging for the most current customer service contact details.
