Mr. Heater MH25LP / MH25NG operating instructions Heater Mounting Information

B.Prepare to install the heater wall mounting bracket as follows:

1.If the wall mounting bracket is to be attached to a stud and wallboard wall, refer to Figure 3 for dimensions, locate a stud, and drill two 1/8" pilot holes into the stud centerline. Use template for simplified installation.

2.If the wall mounting bracket is to be attached to a brick or masonry wall, refer to Figure 3 for dimensions. Obtain two 1/4 inch (inside diameter)expansion anchors and determine the correct drill size to be used with them. Drill the appropriate size holes in the brick or ma- sonry to accept the anchors.

C.Place the wall mounting bracket on the wall and align the two through holes on the bracket with the pilot holes or anchors. Install 1/4 inch by 2-1/2 inch lag screws through the bracket into the stud or anchors. Tighten securely.

D.Locate heater mounting clip on back of heater and select the 1/4" – 20 by 3/4" hex head bolt and 1/4" -

20hex nut.

E.Position the heater as shown in Figure 3 and slide the heater mounting clip over the bracket and install

the bolt through the clip and bracket.

F.Thread the hex nut onto the bolt and tighten securely.

G.Ensure that the selected thermostat location meets all of the above requirements. Refer to the instructions that come with the thermostat for additional grounding information and mounting instruction.

H.If the wall is of stud and wallboard construction, then use the #6 by 1 inch sheet metal screws, included with the thermostat, and mount the thermostat in the selected location.

I.If wall is brick or masonry, the appropriate anchors must be obtained to accommodate thermostat mounting screws. Use the back plate of the thermostat as a template to mark the hole locations, drill appropriate size anchor holes, install the anchors, securely attach the thermostat using the mounting screws.

J.Connect thermostat wires to gas valve as shown in Figure 4.

Figure 3. Heater Mounting Information

	CEILING
	HEATER
24” MIN	1/4”-20x3/4”	MOUNTING
		CLIP
	HEXHEAD BOLT
HEATER WALL
MOUNTING	1/4”-20
BRACKET	HEX NUT

9”	FLUE
	DEFLECTOR

GAS

CONTROL

VALVE

HEATER

REFLECTOR

1/4” X 2-1/2” LONG LAG SCREWS (2 REQUIRED)

58”

1/2” NPT GAS INLET (DO NOT EXCEED 1/2 PSI)

THERMOSTAT CABLE (SEE FIGURE 4)

#6 X 1” SHEET METAL SCREWS

(2 REQUIRED - INCLUDED WITH THERMOSTAT)

UNFINISHED

SIDE

THERMOSTAT (SEE INSTRUCTIONS INCLUDED WITH THERMOSTAT

FLOOR

FINISHED

SIDE

FLANGE

PREDRILLED

HOLES

Model # MH25NG/LP HS25NG/LP 7 Installation instructions and Owner’s Manual