2-8. INITIAL ADJUSTMENTS AND CHECKS - continued.
Water Heater. See figure 2-21.
Make sure water ball valve (1) is open. (Handle is parallel with piping).
Open draincock (2) until water flows from vent hose (5). Close draincock (2). Clockwise rotation closes
Fully open air band (8).
If water heater thermometer reading is above temperature control setting, temperature control
must be set to higher temperature. This will cause the water heater not to operate.
Set water temperature control (3) to 1600F (71°C).
Open control box and press UV scanner flame safeguard control reset button. Close control box.
Do not touch exhaust ducts while running or immediately after shutdown, as severe burns may
Open fuel shutoff globe valve (7). Counterclockwise opens valve.
Set subcircuit breaker (4) to ON.
Open pump bleeder valve on fuel pump (9) until fuel flows, then close.
Adjust fuel pressure for elevations as follows:
Up to 2500 ft
125 psi (preset at factory)
2501 ft to 4000 ft
4001 ft and UP
Remove cap plain nut from right side of fuel pump (9).
Turn screw in or out to the desired setting on fuel pressure gage (6).
Install cap plain nut.
Adjust air band (8) until there is little or no smoke in the heater exhaust.
If any questions on water heater, refer to TM 10-4520-259-13&P.
Change 1 2-59