Use and Care Manual

TANKLESS WATER HEATER

C. ADJUSTING GAS PRESSURE AT THE WATER HEATER

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

tem during any pressure testing of the system at test pressures greater than ½ psi (3.5 kPa).

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 16.

Do not fire (operate) the water heater until all connections have been completed and the heat exchanger is

filled with water. Doing so will damage the water heater and void the warranty.

D. SETTING AND VERIFYING THE COMBUSTION SETTING

1. After the appliance has fired, flip DIP switch seven (7) to the ON position (low fire). Proceed to check

appliance combustion values.

Table 15 – Gas Pressure Requirements

LP GAS NATURAL GAS

Minimum Pressure

8.0” WC

Minimum Pressure 3.5” WC

Maximum Pressure 13.0” WC

Maximum Pressure

10.5” WC

NOTE: Refer Figure 18 when adjusting gas pressure. Loosen the bolts before checking the

gas inlet pressure.

NOTICE

NOTE: Use a combustion analyzer to ensure CO and CO2 values are within the range shown in

Table 16.