Maintenance | Mr. Heater MH9B manual

•Depress and turn Control Knob counterclockwise to “PILOT” position and hold for 1 - 2 minutes. This may take longer to purge air from the supply hose depending on the length of the hose being used.

•Depress red spark ignition button to light pilot flame (repeat until pilot lights) and continue to hold Control Knob down and at “PILOT” position for 30-60 seconds to enable Pilot Light Safety System.

•After lighting pilot, release knob. Knob should return to fully extended position. To operate heater slightly depress knob and gently turn to lock in desired position.

•Fully turn Control Knob to “HI” position to light burner tile. Leave on “HI” position until burner tile turns bright orange.

•After burner tile has turned bright orange, adjust heat output by turning Control Knob to desired position (“LO” or “HI” setting).

Caution: Do not try to adjust heating levels by using the propane tank shut off valve.

Warning:

DO NOT OPERATE HEATER UNLESS CONTROL KNOB IS LOCKED IN A POSITION MARKED “HI”, “LO” or

“PILOT”.NEVER SET CONTROL KNOB BETWEEN LOCKED POSITIONS. POOR COMBUSTION AND HIGHER LEVELS OF CARBON MONOXIDE MAY RESULT.

•To shut off heater, shut off propane at supply tank, allow heater to use-up propane in supply line until heater shuts off, then slightly push down and turn Control Knob clockwise to “OFF” position.

•CAUTION: After turning heater off, wire guard will remain hot. Allow to thoroughly cool before storing.

•When not in use, the gas must be turned off at the LP- gas supply cylinder. As stated before allow heater to use up propane in supply line until heater shuts off. When the LP-gas supply cylinder is not disconnected from the heater, the heater and the cylinder must be stored outdoors, in a well ventilated space, out of reach of children, and must not be stored in a building, garage or any other enclosed area.

•Indoor storage of the heater is permissible only if the cylinder is disconnected and removed from the heater. Cylinders must be stored outdoors out of the reach of children and must not be stored in a building, garage or any other enclosed area.

MAINTENANCE:

Always keep the heater area clear and free from combustible materials, gasoline and other flammable vapors and liquids. Keep the vent areas (slots in the bottom and the top at the front of heater) clear at all times.

Visually inspect the pilot flame and burner periodically during use. The pilot flame should be blue in color (not yellow) and will extend beyond the thermocouple. The flame will surround the thermocouple just below the tip, see Figure 2.

Figure 2

A slight yellow flame may occur where the pilot flame and main burner flame meet. The burner should be bright orange (with a slight blue color around the border, a red-orange haze that is visible on the ceramic tile is acceptable) and without a noticeable flame. A blue flame that rolls out at the top of the ceramic tile indicates an accumulation of dust, lint or spider webs inside the casing assembly and main burner assembly. If the pilot is yellow or the burner has a noticeable flame, cleaning may be required. Use the following procedure to inspect the casing assembly and main burner assembly.

It is necessary to periodically check the burner orifice and burner venturi tube to make sure they are clear of insects/nests or spider webs that may accumulate over time. A clogged tube can lead to a fire.

1Allow heater to thoroughly cool before performing any maintenance.

2Remove disposable 1 lb. cylinder from heater or turn OFF gas supply at remote cylinder valve, and disconnect hose from heater.

3Remove wire guard from front of heater by gently bending to remove from holes in front cover.

4Remove (1) burner assembly retaining screw from bottom of the heater.

5Pull burner assembly from front of the heater.

6Inspect interior of casing assembly for accumulation of dust, lint or spider webs. If necessary, clean interior of casing assembly with a vacuum cleaner or apply air pressure. Do not damage any components within casing assembly when you are cleaning.

7Inspect and clean main burner orifice (mounted to pilot bracket with jam nut) by using a vacuum or apply air pressure at orifice opening.

8Inspect and clean pilot (mounted to bracket) by using a vacuum or apply air pressure through the holes in the pilot indicated by the arrows in Figure 2.

WARNING: Never use needles, wires, or similar cylindri- cal objects to clean the pilot to avoid damaging the

Mr. Heater Portable Buddy

Operating Instructions and Owner’s Manual 05/12/06 73432CAL Rev. L1

MH9B specifications

The Mr. Heater MH9B is a portable propane heater designed for versatility and efficiency, making it an ideal choice for various outdoor activities and indoor use in well-ventilated areas. With a compact design and powerful heating capabilities, this unit has gained popularity among campers, tailgaters, and those seeking supplemental heat in emergencies.

One of the standout features of the MH9B is its radiant heating technology. The heater emits infrared heat that warms objects and people directly within its vicinity rather than simply heating the air. This leads to efficient energy use and provides warmth almost instantly. The unit is capable of producing up to 9,000 BTUs, making it suitable for spaces up to 200 square feet. Its adjustable heat settings allow users to customize their comfort level, offering a range from 4,000 to 9,000 BTUs per hour.

Safety is a primary consideration in the design of the MH9B. It includes an automatic shut-off feature that activates if the heater tips over, ensuring that users can operate it with peace of mind. Additionally, the unit is equipped with a low-oxygen shut-off system that automatically shuts down the heater when carbon monoxide levels become dangerous, making it a safe option for indoor use in well-ventilated spaces.

The MH9B operates on standard 1 lb propane cylinders, providing a straightforward and practical fuel option. Users can also connect it to larger propane tanks with the right adapter, enhancing its usability for extended outdoor trips. The heater is lightweight, weighing only about 9 pounds, and comes with a built-in handle for easy portability, allowing users to transport it effortlessly from one location to another.

Another notable aspect of the Mr. Heater MH9B is its sturdy construction. The body is made of durable metal, ensuring longevity and the ability to withstand the rigors of outdoor use. The heater's easy-to-use control knobs are designed for quick adjustments, even when wearing gloves, making it user-friendly in various conditions.

In summary, the Mr. Heater MH9B combines innovative heating technology, safety features, portability, and durable construction, establishing itself as a reliable heating solution for both indoor and outdoor applications. Whether enjoying a camping trip or needing emergency warmth, this heater offers the comfort and efficiency to meet diverse needs.