Richmond RMTGHRH111DVLN User Manual

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AP18733 REV. 3.2.17

▪ C. ADDITIONAL PRECAUTION FOR EXCESS FLOW VALVE (EFV

)

If an excess ow valve (EFV) is in the gas line, check the manufacturer’s minimum and

maximum ow capacity ratings. An improperly sized EFV will not allow for a full ow of gas

to the water heater and will cause the water heater to malfunction. See Figure 21.

▪ D. ADJUSTING GAS PRESSURE AT THE WATER HEATER

NOTE: Refer Figure 22 when adjusting gas pressure. Loosen the bolts before checking the

gas inlet pressure.

1. The water heater and its individual shutoff valve must be disconnected from the gas

supply piping system during any pressure testing of the system at test pressures greater

than ½ psi (3.5 kPa).

Figure 20 – LP Gas Piping Installation – NOTE: Capacity to be Not Less than Total Capacity of Connected Appliances

2. The water heater must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of

the gas supply piping system at test pressures equal to or less than ½ psi (3.5 kPa). The minimum and maximum inlet gas line pressures must meet

the requirements shown in Table 18.

LP GAS / NATURAL GAS

Minimum Pressure 5.0" W.C (1.25 kPa)

Maximum Pressure 13.0″ W.C (3.24 kPa)

Manifold pressure port

Inlet Gas pressure port

Figure 21 – Excess Flow Valve (EFV)

Table 18 – Gas Pressure Requirements

NOTICE

Do not re (operate) the water heater until all connections have been complet-

ed and the heat exchanger is lled with water. Doing so will damage the water

heater and void the warranty.

Figure 22 – Inlet Gas Pressure Port Detail

▪ E. SETTING AND VERIFYING THE COMBUSTION SETTING

NOTE: Turn on a hot water faucet at a nearby location in the water heating system to

draw water at a high ow rate. This will ensure the water heater will run continuously

while running the combustion test.

NOTICE

Do not re (operate) the water heater until all connections have been completed and the heat exchanger is lled with water. Doing so will

damage the water heater and void the warranty.

1. After the appliance has red, ip DIP switch seven (7) to the ON position (low re). Proceed to check appliance combustion values.

NOTE: Use a combustion analyzer to ensure CO and CO

values are within the range shown in Table 19.

WARNING

It is required to use a combustion analyzer to verify nal adjustment according to the combustion chart (Table 19). Failure to do so could

result in serious personal injury or death.

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Richmond RMTGHRH111DVLN Encore 11 GPM 199,900 BTU Tankless Natural Gas Water Heater