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1. The machine must be running and the burner ON.
BURNER AIR ADJUSTMENT
2. Loosen the Locking Screw (#3 at left) on the shutter.
3. Check for smoke from the heat exchanger exhaust. If smoke is not present, slowly close the Air Shutter (#1 at left)
by moving the dial counterclockwise to a lower number. Continue moving the dial until smoke appears.
4. Record this setting.
5. Open Air Shutter (#1 at left) two increments. Example: If Air Shutter was set at 2, move it to 4.
6. Slowly trigger the gun on and off. This will cause the burner to turn on and off. Look for a smoke puff when the
burner ignites.
7. Repeat steps 5 and 6 until a smoke puff is noticed. Record the Air Shutter Setting.
8. The difference between the recorded settings in steps 4 and 7 is the combustion window. Set the dial 1/2 way
between these settings.
NOTE: If you are unable to detect a setting on either step 3 or 7, more or less air may be needed to achieve a
proper combustion window. Loosen the Bolt (#4 at left) and open the Air Band (#2 at left) in 1/4" increments.
Repeat steps 3-8 until proper combustion window is achieved.
TEST WATER & FUEL PRESSURE: These procedures should be performed by an authorized service technician.
TEST WATER TEMPERATURE: This procedure should be performed by an authorized service technician.
MAINTENANCE – EVERY 6 MONTHS
REPLACE FUEL FILTER – Follow the instructions specified on the fuel filter for correct procedure.
MAINTENANCE – EVERY 12 MONTHS
DELIME COIL – A loss in pressure may signify that the coil needs to de delimed. Do this procedure on a periodic
basis.
1. Mix deliming powder/solution according to package directions.
2. Remove the nozzle from the wand. Place a nylon stocking over the wand assembly to collect debris, then place
the wand assembly into the float tank.
3. Ensure the trigger gun is open and start the engine to allow water to circulate through the system. Allow process
to continue for 2-4 hours (Consult deliming agent package directions for exact time).
4. Once process is complete, turn off engine. Drain and clean the float tank, remove the nylon stocking, and clean
the gun and wand assembly.
5. Flush the entire system with clean, fresh water and place the nozzle in the wand assembly.
6. Dispose of deliming solution according to local, state, and federal regulations.
TEST VOLTAGE AND AMP DRAW - Use a voltmeter and amp meter to test the machine for correct voltage and am-
perage. If you do not have these instruments or are unsure of how to perform these tests, this procedure should be
performed by an authorized service technician.
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STORAGE & MAINTENANCE
HMT-4004-0MGH Operator's Manual
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