Valor G4 780MNGK User manual

WARNING
This conversion kit shall be installed by
a qualified service agency in accordance
with the manufacturer’s instructions and
all applicable codes and requirements
of the authority having jurisdiction. If
the information in these instructions is
not followed exactly, a fire, explosion
or production of carbon monoxide
may result causing property damage,
personal injury or loss of life. The
qualified service agency is responsible
for the proper installation of this kit. The
installation is not proper and complete
until the operation of the converted
appliance is checked as specified in the
manufacturer’s instructions supplied with
the kit.
Use this manual in conjunction with the
installation manual supplied with the
appliance.
780MNGK / 780MPGK Gas Conversion Kit
Use with Valor G4 780M Heater Models ONLY
INSTALLATION MANUAL
G4 Series
4007968-02
©2021, Miles Industries Ltd.
Kit Contents
• 1 Pilot injector
• 1 Main burner injector elbow
• 1 Air shutter
• 1 Pilot shield
• 1 Minimum rate bypass screw
• 1 Set of conversion labels
Tools Required
• Wrenches, to disconnect gas line
• Phillips (+) screwdriver, to remove burner module
• Small (jewelers size) flat blade screwdriver, to set
pressure
• Small flat blade screwdriver, to release pressure tap
on valve
• Needle nose pliers, to remove bypass screw
• Hex (Allen) wrench, 4 mm or 5/32”, to remove pilot
injector
• Manometer, to set pressure
Specifications
*bThis appliance is certified for use from 0–4500 feet. For
altitudes above 4500 feet, see local codes.
Model 780MN 780MP
Gas Natural Propane
Altitude (Ft.)* 0-4,500 feet*
Input Maximum (Btu/h) 28,000 28,000
Input Minimum (Btu/h) 14,000 14,000
Manifold Pressure (in w.c.) 3.2” 10.5”
Minimum Supply Pressure (in w.c.) 5” 11”
Maximum Supply Pressure (in w.c.) 10” 14”
Main Burner Injector Marking 850 300
Pilot Injector Marking 51 30
Min. Rate By-Pass Screw 185 125

General Notes Regarding Conversion
The conversion may be done before or after the
appliance is installed into the cavity. However, if the unit
has been installed, it must be removed from the cavity
(see below). Also, the gas must be connected to set the
manifold pressure.
Prepare the Appliance
1. Locate gas shut offvalve and isolate gas supply.
2. Remove any installed trims, fronts, and doors.
3. Remove the window.
4. If the fireplace is already installed:
a. Remove the fuel bed. Be careful with fuel bed
as components are fragile.
b. Remove liner panels.
c. Disconnect the exhaust slide screws (2 screws
at top front of unit).
d. Pull the unit out while disconnectingthe
exhaust slide. Leave the vents and slider
hangingin the chimney.
5. Remove left shroud (2 screws).
6. Remove the side cover (2 screws at left, 3 at the
front).
7. Remove burner cover (2 screws).
Note
Consult your Installation Manual for details on the
steps in this section.
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7. Replace the burner. The stem on the end of the air
shutter must mate with the vertical slot in the link
bracket. No nut is required.
8. Connect the fuel supply line and tighten the nut. The
burner angle may need adjusting to better align in-
jector threads with the fuel line nut while tightening.
9. Reattach the burner supports (4 screws).
10. Air shutter stopper, if equipped.
This part is no longer necessary. If the appliance has
an air shutter stopper, remove the 2 screws retain-
ing it, discard it and reinstall the 2 screws to plug the
holes. This part is no longer used
If appliance equipped
with air shutter
stopper, remove
and discard. Re-use
screws to plug holes.
Air shutter stopper
removed
Replace Burner Injector
1. Undo burner supports (4 screws).
2. Unscrew the nut at the end of the burner fuel
supply line, and lift the burner and supports out of
the fireplace (complete with injector elbow at-
tached).
3. Unscrew and disengage the injector elbow. Be
aware that four pieces sit between the elbow and
the burner, do not drop them.
4. Exchange injector elbow from kit, verifying the new
injector before you install—see Specifications table
on page 1. The injector number is stamped on the
corner of the elbow.
5. Exchange the air shutter from kit as its shape is dif-
ferent for each fuel.
6. Reassemble the burner, putting the flat washer, ten-
sion washer, air shutter, and anti-flashback shield
back in order as shown below. Reconnect injector
elbow to the burner, as tightly as possible while
leaving the elbow connection angled toward the
fuel supply line. Do not over tighten.
Nut
Injector elbow
Anti-flashback
shield
Air shutter
different shape
for each fuel
Natural Propane
Tension washer
(wavy)
Flat washer
3

Test Air Shutter Movement
Locate the air shutter lever on the left of the module
plate under the receiver. Pull and push it to ensure it is
moving freely.
Replace the Pilot Injector
1. Remove the pilot shield (2 screws).
2. Remove the pilot hood by releasing the U-clip and
pulling up on the hood. The U-clip should not be
removed.
3. Unscrew the pilot injector using an Allen key. Dis-
card the old pilot injector.
4. Replace with the appropriate pilot injector—see
Specifications table on page 1 (the pilot injector
number is stamped on the barrel). Screw in the new
injector.
Pilot hood
U-clip
5. Refit the pilot hood by
pushing down on it, mat-
ing its notch and key at the
base. Ensure that it snaps
into position.
6. Install the pilot shield
supplied with the kit if
different than the one that
was installed (2 screws).
Notch
Key
4

Replace the Minimum Rate Bypass Screw
1. Locate and remove the bypass screw from the valve
and discard (this screw may be covered by a stick-
er). Note: The bypass screw may require either a
flat head screwdriver or an Allen key depending on
its type. The bypass screw has a rubber O-ring and
may need to be carefully pulled out using pliers
after unscrewing.
2. Insert the replacement minimum rate bypass screw
and hand tighten using a screwdriver/Allen key.
Refer to the Specifications table on page 1 for proper
bypass screw (the number is stamped on the barrel
of the screw).
Re-install Module and Test for Leaks
1. Reconnect gas inlet to valve, tightening pipe con-
nection. Open shut offvalve and inspect.
2. Test for leaks by applying a liquid detergent or soap
solution to all connection joints that were taken
apart and reassembled. Bubbles forming indicate a
gas leak.
Bypass screw
Valve
WARNING
NEVER use an open flame to check
for leaks! Correct any leak detected
immediately.
Set the Manifold Pressure
1. Fit a manometer to the manifold pressure test tap
on the valve—see figure below.
2. Light the appliance and turn the control to full input.
3. Adjust the pressure adjustment screw using a small
jeweller’s size flat blade screwdriver—as shown
below—while the appliance is running at full input to
produce manifold pressure, as per Specifications
table on page 1.
4. Turn offthe appliance, remove the manometer and
tighten the test tapping screw.
5. Check all connections for leaks.
Manifold
Pressure
Test Tap
Valve Inlet
Pressure
Loosen screw to check
(tighten afterwards)
Pressure Test Tappings
Front Face of Control Valve
Pry o
Plastic Cap
Pressure ad-
justment screw
behind plastic
cap
Increases pressure
Decreases pressure
Front face of
control Valve
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