Operation
900414-00 12/2015
Innovative Hearth Products
MHD 35/40 Series Direct-Vent Gas Fireplaces
52
Burn-in Period
The first few times this fireplace is operated, there will be an odor from the curing of paint and the burning off of the
lubricants used in the manufacturing process. Depending on usage, the burn-in period may take a few hours or a few
days.
NOTE:
Ventilate the site during the burn-in period. The resulting odor and haze may set off a smoke detector. Do not
operate the blower during the burn-in period.
A white film may develop on the glass front during the first few fires as part of the burn-in period. The glass
should be kept clean during the burn-in period to prevent the film from baking on—making it very difficult to
remove (
Cleaning the glass door on
Page 59
)
.
Accessing the Control Compartment
NOTE:
If the door is difficult to open/close, remove it as instructed and straighten the door tabs
(
Figure 46
)
.
1.
Access the control compartment by holding the control compartment door by the top and gently lifting it up,
then rotating it away from the fireplace.
Closing the Control Compartment
1.
Swing the door gently up and then lift and set the door so it catches in the upright, closed position.
Removing the Control Compartment Door
1.
Remove the bottom, left screw
(
Figure 45
)
inside the control compartment securing the control compartment
door. Retain the screw for later reinstallation.
2.
Position the left side door tab
(
Figure 46
)
out of the tab groove and align it with the vertical slot
(
Figure 44
)
.
Figure 45 - Control compartment door slots
Figure 46 - Control compartment door tabs
Vertical
slot
Screw
hole
Tab pivot
hole
Tab
groove
Door
tabs
3.
Lift the left side of the control compartment door with the tabs in the vertical slot until the tabs clear the slot,
disengaging the left side of the door from the fireplace.
4.
Pull the door to the left to disengage the right side door tabs, and remove the door. Store the control
compartment door in a secure location until reinstallation.
Gas Controls
The standard controls for fireplace operation are located in the control compartment, below the glass door
(
Figure 36,
Page 39
)
. Optional control switches are also available.
Millivolt and electronic gas control systems operate differently.
• Millivolt Fireplaces
(
Figure 1, Page 9
)
Familiarize yourself with the gas control valve and the lighting procedure
(
Page 65
)
.
Millivolt Fireplaces
Detailed lighting instructions are found on
Page 65
. Also, millivolt fireplace lighting instructions are found on the
pull-out lighting instructions attached to the gas control valve.
When the pilot is lit, the main burner can be turned ON/OFF using a wall switch, remote control, optional on-unit
rocker switch (FRS), or wall thermostat.
If the millivolt fireplace is equipped with an optional remote switch (wall switch, remote control, rocker switch, or
wall thermostat) and the pilot is lit, the fireplace main burner can be turned ON/OFF using the optional switch.
