Reliance Water Heaters N71120NE Hydro Cannon self-cleaning system, High limit switch, Uncrating

FEATURES AND COMPONENTS

the Hydro Cannon (self-cleaning system)

These units include The Hydro Cannon (Self-Cleaning System) installed in the front water inlet, See Figure 1. The Hydro Cannon inlet tube can only be used in the front water inlet connection. Do not install the Hydro Cannon inlet tube in either the top or back inlet water connection. The Hydro Cannon must be oriented correctly for proper function. There is a marked range on the pipe nipple portion of the Hydro Cannon, that must be aligned with the top of the inlet spud. A label above the jacket hole has an arrow that will point to the marked portion of the pipe nipple if the orientation is correct. If the arrow does not point within the marked range on the pipe nipple, adjust the pipe nipple to correct. A pipe union is supplied with the Hydro Cannon to reduce the probability of misaligning the Hydro Cannon accidentally while tightening the connection to the inlet water supply line. Improper orientation of the Hydro Cannon can cause poor performance of the heater and can significantly reduce outlet water temperatures during heavy draws.

Note: The Hydro Cannon may have 1, 3 or 7 cross tubes.

FIGURE 1.

high limit switch

The digital thermostat (Figure 2) contains the high limit (energy cutoff) switch. The high limit switch interrupts main burner gas flow should the water temperature reach 203°F (95°C).

In the event of high limit switch operation, the appliance cannot be restarted unless the water temperature is reduced to approximately 120°F (49°C). The high limit reset button on the front of the control then needs to be depressed.

Continued manual resetting of high limit control, preceded by higher than usual water temperature is evidence of high limit switch operation. The following is a possible reason for high limit switch operation:

•A malfunction in the thermostatic controls would allow the gas valve to remain open causing water temperature to exceed the thermostat setting. The water temperature would continue to rise until high limit switch operation.

Contact your dealer or service agent if continued high limit switch operation occurs.

DIGITAL THERMOSTAT

FIGURE 2.

electronic ignition control

Each heater is equipped with a ignition module. The solid state ignition control (Figure 3), ignites the main burner by utilizing a silicon nitride igniter. The silicon nitride igniter shuts off during the heating cycle and the main burner flame is sensed through a remote flame sensor integral to the silicon nitride igniter assembly.

The ignition control will try to ignite the main burner three times before lockout. Then it waits one hour before trying again to ignite the main burners. This is a continuous cycle.

IGNITION CONTROL BOARD

FIGURE 3.

exhaust inducer (blower assy.)

All models are equipped with an exhaust inducer. The inducer assists in drawing in fresh air to the unit for combustion and then assists in dispensing the combustion by-products into the venting leading outside.

The exhaust inducer is equipped with a gravity controlled damper to reduce the amount of heat loss through the flue, improving efficiency.

EXHAUST INDUCER

FIGURE 4.

uncrating

The heater is shipped with the inducer already installed. The wiring conduit runs from the thermostat to the inducer. Before turning unit on, check to make sure the wiring conduit is securely plugged into the inducer.

Low Gas Pressure Switch

The Low Gas Pressure Switch monitors the gas supply pressure. If the gas supply pressure drops below 5.2” W.C., the burners are extinguished (if the heater is running) or the heater will not start up.

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