Ao-smith 315795-000 MH User Manual download pdf (Page 17)

SEDIMENT TRAPS

A sediment trap shall be installed as close to the inlet of the water

heater as practical at the time of water heater installation. The

sediment trap shall be either a tee ﬁ tting with a capped nipple in the

bottom outlet or other device recognized as an effective sediment

trap. If a tee ﬁ tting is used, it shall be installed in conformance with

one of the methods of installation shown in Figures 27, 28 and 29.

FIGURE 27. GAS PIPING WITH FLEXIBLE CONNECTOR.

FIGURE 28. GAS PIPING WITH ALL

BLACK IRON PIPE TO GAS CONTROL.

FIGURE 29. ALTERNATIVE SEDIMENT TRAP LOCATION

Contaminants in the gas lines may cause improper operation of

the gas control valve/thermostat that may result in ﬁ re or explosion.

Before attaching the gas line be sure that all gas pipe is clean on

the inside. To trap any dirt or foreign material in the gas supply line,

a drip leg (sometimes called a sediment trap) must be incorporated

in the piping. The drip leg must be readily accessible. Install in

accordance with the “Gas Piping” section. Refer to the current

edition of the Natural Gas and Propane Installation Code (CAN/CSA

B149.1-current edition).

FUEL CONVERSION INSTRUCTIONS

FROM NATURAL GAS TO PROPANE (L.P.) GAS

This water heater has been factory equipped to operate with the

type gas indicated in the “EQUIPPED FOR” area of the model rating

plate located near the gas control valve/thermostat. The indicated

gas may be either Natural or Propane (L.P.). By following the

conversion instructions in this manual or the instructions near the

gas control valve/thermostat, the water heater must be converted if

it is to be used with the opposite gas. DO NOT USE THIS WATER

HEATER WITH ANY GAS OTHER THAN THE ONE LISTED ON

THE MODEL RATING PLATE. Failure to use the correct gas can

cause problems which can result in DEATH, SERIOUS BODILY

INJURY, OR PROPERTY DAMAGE. If you have any questions or

doubts consult your gas supplier or gas company.

Read and follow detailed conversion instructions located on the

water heater and also in the instruction manual in their entirety before

starting the conversion.

Conversion kit with necessary parts are in a bag attached to the

drain valve.

FOR 30 GALLON HEATER:

Oriﬁ ce size: #40 for Natural / #52 for Propane (L.P.),

if converted - Propane Rate: 30,000 BTU.

FOR 40 GALLON HEATER:

Oriﬁ ce size: #38 for Natural / #51 for Propane (L.P.),

if converted - Propane Rate: 32,000 BTU.

FOR 50 GALLON HEATER:

Oriﬁ ce size: #35 for Natural / #51 for Propane (L.P.),

if converted - Propane Rate: 38,000 BTU.

Step 1. Turn gas control knob “A” to “PILOT”. Depress and turn

“OFF”, see Figure 30 page 19.

Step 2. Remove outer and inner access doors from water

heater.

Step 3. Remove burner assembly from water heater control

by ﬁ rst removing 6 screws holding inner door to heater,

then loosening 3/4” nut “H” holding burner assembly to

control, see ﬁ gures 31 and 32. Loosen pilot tube nut “J”

and thermocouple nut “K” at control. Disconnect wire to

Piezo Igniter.

Step 4. Remove screws “D” disengaging manifold from burner,

see Figure 33 page 19.

Step 5. Remove oriﬁ ce “E”, see Figure 34 page 19 using 3/8”

wrench. Install oriﬁ ce marked “L.P.” found in the bag into

manifold. Tighten securely. Secure burner to manifold with

screws “D”.

Step 6. Loosen pilot tube nut “F”, see Figure 34 page 19. Remove

oriﬁ ce “G” and replace with red colored oriﬁ ce found in bag.

Reinstall nut “F” and tighten securely.

Step 7. Make sure all connections are tightened securely, and

reinstall burner assembly into water heater. Position end

of manifold inside bracket as shown in Figure 33 page

19. Reinstall manifold into control and tighten 3/4” nut

(“H”) securely. Recheck to see that end of manifold is still

inside bracket as shown in Figure 33 page 19. Reinstall

pilot tubing and thermocouple into control, see Figure 31

page 19. Connect wire to Piezo Igniter. Reinstall inner door

using the 6 screws removed in Step 3.

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Ao-smith 315795-000 MH User Manual Page 17

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