Mr. Heater GAS FIRED INFRA-RED WORKSHOP HEATER MH25LP / MH25NG Operation And Owner's Manual page 7

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" -
20 hex nut.
E. Position the heater as shown in Figure 3 and slide
the heater mounting clip over the bracket and install
1/4"-20x3/4"
24" MIN
HEXHEAD BOLT
HEATER WALL
MOUNTING
BRACKET
9"
1/4" X 2-1/2" LONG
LAG SCREWS
(2 REQUIRED)
58"
Model # MH25NG/LP
Figure 3. Heater Mounting Information
CEILING
HEATER
MOUNTING
CLIP
1/4"-20
HEX NUT
GAS
CONTROL
VALVE
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)
THERMOSTAT (SEE INSTRUCTIONS
INCLUDED WITH THERMOSTAT
FLOOR
HS25NG/LP
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.
FLUE
DEFLECTOR
HEATER
REFLECTOR
UNFINISHED
SIDE
7
Installation instructions and Owner's Manual
FINISHED
SIDE
FLANGE
PREDRILLED
HOLES