31
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Installation and Operation Instructions
900300-00, 01/2018
Innovative Hearth Products
DRT35ST and DRT35PF Direct-Vent Gas Fireplaces
Step 8. VERIFYING APPLIANCE OPERA-
TION
With gas line installed run initial system
checkout before closing up the front of the unit.
Follow the pilot lighting instructions provided
in the Installation and Operation Instructions
manual. For piezo igniter location see
Figure
51
on
Page 29
(millivolt appliances only).
NOTE:
Lighting Instructions are also found on
the literature tag tied to the gas piping next
to the gas valve. To access the tag, open the
lower control compartment door (
Figure 51
) by
pushing in simultaneously the left and right top
corners of the door. (The door is hinged at the
bottom). Remove the bottom compartment door
by sliding the hinge pin, located at the door’s
left side, to the right until it disengages from
the left corner post hole. Remove the modesty
panel. To remove the modesty panel, slide the
panel forward until it contacts the cabinet bot-
tom panel, then lift straight up and tilt forward.
Remove the modesty panel carefully, so that
none of the wires become loose or disconnected.
When first lighting the appliance, it will take a
few minutes for the line to purge itself of air.
Once purging is complete, the pilot and burner
will light and operate as indicated in the instruc-
tion manual.
Subsequent lighting of the appliance will not
require such purging. Inspect the pilot flame
(remove logs, if necessary, handling carefully).
Millivolt Appliance Checkout
The pilot flame should be steady, not lifting
or floating. Flame should be blue in color with
traces of orange at the outer edge.
The top 3/8" (10 mm) at the pilot generator
(thermopile) and the top 1/8" minimum (tip)
of the quick drop out thermocouple should be
engulfed in the pilot flame.
Hinge Pin
Gas Valve
Piezo Igniter
Latch for
Glass Door
Figure 51 - front access panel removed for clarity
HI/LO (flame height
control knob)
OFF/PILOT/ON (gas control knob)
Gas Flex Line
Control Compartment
Access panel
OFF/ON Switch
MILLIVOLT
Thermocouple
Hood Igniter Rod
3/8" Min
(9 mm)
Thermopile
Pilot
Nozzels
The flame should project 1" (26 mm) beyond
the hood at all three ports
(see
Figure 52
)
.
Replace logs if removed for pilot inspection.
To light the burner; turn “ON” the remote wall
switch and rotate the gas valve control knob
counterclockwise to the “ON” position (“ON”
will be at the top side of the valve).
Electronic Appliance Checkout
To light the burner, turn ‘ON’ the unit mounted
On/Off switch or the optional remote wall switch.
Ensure the igniter lights the pilot. The pilot
flame should engulf the flame rod as shown
in
Figure 53
.
Figure 52
ELECTRONIC
Proper Flame
Adjustment
Pilot
Nozzle
3/8 To 1/2 Inch
(9 mm to 13 mm)
Ground
Electrode
Flame Rod
Hot Surface
Igniter
Figure 53
