Installation
900378-00 04/2017
Innovative Hearth Products
MHD35 Series Direct-Vent Gas Fireplaces
38
2.
Wire the control switch within the millivolt control circuit using the 15 ft of 2-conductor wire supplied with the
unit
(
Figure 35, page 39
)
.
NOTE:
The supplied 15 ft of 2-conductor wire has one end of each conductor connected to the gas valve circuit and
the other end of each conductor placed loose inside the bottom compartment.
CAUTION
In millivolt systems, do NOT connect a wall switch to a 120 V power supply.
Wiring the Electronic Junction Box
One of the following optional controls must be used:
•
ON/OFF Wall Switch,
• Thermostat,
or
• Remote
Control.
See the
Operation
section on
Page 50
for more details.
1.
Route a 3-wire, 120 Vac, 60 Hz, 1 ph power supply to the fi replace junction box.
2.
Remove the electrical inlet cover plate from the side of the unit by removing the plate’s securing screws
(
Table 12,
page 17
)
.
3.
If unit is not supplied with a strain relief, remove the cover plate knockout. Then, feed the power supply wire
through the knockout opening and into the unit junction box.
4.
Connect the black power supply wire to the lower outlet’s red pigtail lead
(
Figures 34 and 35, page 39
)
. Connect
the white power supply wire to the outlet’s common terminal.
5.
Connect the ground supply wire to the pigtail lead attached to the outlet’s green ground screw. Restrain the inlet
power lead per NEC or local codes.
6.
If a wall-mounted ON/OFF control, High/Low switch, or thermostat is to be used, mount it in a convenient location on a wall
near the fi replace.
7.
If an optional control is to be used, wire it in the low voltage circuit
(
Figure 35, page 39
)
.
NOTE:
The supplied 15 ft of 2-conductor wire has one end of each conductor connected to the gas valve circuit
and the other end of each conductor placed loose inside the bottom compartment.
8.
After the wiring is complete, replace the cover plate.
11.
Installed Blower Information
NOTE:
For steps
12
and
13
, it may be helpful to remove the control compartment door
(
Page 52
)
.
An FBK-250 Blower comes preconfi gured in all MHD Series fi replaces. The FBK-250 offers variable speed control
and a heat-activated switch; perfect for fi replaces controlled thermostatically.
