Master TB116 Owner's Manual page 15

Replacing Ignitor
1.. To. loosen. back. panel. and. gain. access.
to.ignitor,.follow.step.1.under.Replacing
Burner,.page.14.
2.. Remove. ignitor. bracket. screw. and. lift.
ignitor.
3.. Attach.new.ignitor.with.ignitor.mounting.
screw.removed.in.step.2.
4.. Install. new. ignitor.. Ignitor. gap. between.
ignitor. electrode. and. burner. deck. is.
0.13"/0.15".(3.3/3.8.mm).
5.. Test. for. spark.. Plug. into. extension. cord.
and. watch. for. spark. between. ignitor.
electrode.and.burner.deck.
Figure 14 - Ignitor Gap
Replacing Gas Orifice
1.. Hold. burner. flange. and. rotate. orifice.
counterclockwise.to.remove.
2. Install new orifice
IMPORTANT: CHECK FOR GAS LEAKS. Test
all gas piping and connections for leaks after
installation or servicing. Never use an open
flame to check for a leak. Apply a noncorrosive
leak detection fluid to all joints (available at lo-
cal plumbing supply stores). Bubbles forming
show a leak. Correct all leaks at once.
REPLACING DSI CONTROL
1.. Remove. top. (see. Top Panel Removal,
page.13).
2.. Disconnect.orange.ignitor.wire.
3.. Remove.white.wire.connector.
4.. Remove.2.screws.and.nuts.securing.DSI.
control.
5.. Install.new.DSI.control..Reconnect.wiring.
120193-01A
Ignitor.Gap
www.desatech.com
Service
Continued
REPLACING GAS VALVE
1.. Remove. top. (see. Top and Side Panel
Removal,.page.13).
2.. Disconnect.2.blue.wires.
3.. Remove.gas.line.
4.. Remove.2.screws.and.nuts.holding.valve.
to.mounting.plate.
5. Remove brass fittings from old gas valve.
If. damaged. replace. with. new. fittings..
Install fittings into new gas valve. Use
pipe.joint.sealant.that.is.resistant.to.liquid.
petroleum (LP) gas. Tighten all fittings.
6.. Install. new. gas. valve. using. screws. and.
nuts.from.step.4.
7.. Connect.blue.wires.to.new.gas.valve.
8.. Reconnect.gas.line.
IMPORTANT: CHECK FOR GAS LEAKS. Test
all gas piping and connections for leaks after
installation or servicing. Never use an open
flame to check for a leak. Apply a noncorrosive
leak detection fluid to all joints (available at lo-
cal plumbing supply stores). Bubbles forming
show a leak. Correct all leaks at once.
CHECKING REGULATOR
PRESSURE
1.. Remove. top. (see. Top Panel Removal,
page.13).
2.. Locate.pressure.tap.on.solenoid.valve.and.
remove.(retain.plug.for.later.installation)..
See.Figure.15,.page.16.
3. Install 1/8 NPT barb fitting with sealant on
threads.into.solenoid.valve.
4.. Connect.to.manometer.or.pressure.gauge.
that.measures.in.inches.of.water.
5.. Connect.hose.and.regulator.to.heater.and.
tank.
6.. Plug.in.and.turn.on.
15