Combustion Blower Kit Information; Location; Function - Pentair ETi 400 Installation Manual

Combustion Blower Kit Information

The ETi 400 High Efficiency Heater Burner System includes the Combustion Blower,
®
Air Orifice, Combination Gas Control Valve, Gas Orifice, DSI electrode, and Flame-
holder.

Location

There are two combustion blowers in the heater. Each blower is attached to each heat
exchanger. See figure 1.

Function

The Combustion Blower draws in air and gas, and forces the air/gas mixture into the
burner. The Air Orifice, attached to the Blower inlet, meters the flow of combustion
air to the Burner. The Blower inlet is under a negative pressure, and the Blower outlet
is at a positive pressure. To check Combustion Blower operation, disconnect the
flexible plastic tubes at the Pressure Switch and connect them to a differential pres-
sure gauge. Turn the gas off and press POOL ON. When the Blower starts, check the
differential pressure. Increase the temperature setting, if necessary, to start the Blower.
The pressure differential should be as shown in Table 1.
Table 1: Pressure Differential
Model
ETi 400
Pressure Differencial Nominal (in W.C.)
ETi 400 High Efficiency Heater Combustion Blower Replacement Kit Installation Guide
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