Ignition Module Operation - Pentair ETi 400 NA ASME Guía De Instalación Y De Usuario

SAFETY CONTROLS
STACK FLUE SENSORS (SF1, SF2)
The heater is equipped with two Stack Flue sensors; one for each heat exchanger. These sensors monitor the stack flue
temperature and if needed will shut down the heater if the stack flue temperature exceeds 170° F (77° C).
THERMAL FUSE
A Thermal Fuse (TF) is a safety protection device that opens the electrical circuit if the temperature reaches 187° F
(86° C). The fuse cannot be reset, it must be replaced. See page 17 for more information.
FLOAT SWITCH
The Float Switch (FS) is a sensing application that shuts down the heater once the condensate level exceeds the
permitted level in the condensate container. See page 17 for more information.

IGNITION MODULE OPERATION

, (Figure 5),
The Ignition Module
control works in conjunction with a fan control board (Figure 6), and utilizes a microprocessor to continually safely
monitor, analyze, and control the proper operation of the gas flame holder. The module with the presence of the flame
sensor, using flame rectification, allows the heater to operate.
Flame Current
Check Point
Ignition Control Module
Figure 5.
Rev. C 4/2017
(continued)
is microprocessor based and operates on 24VAC supplied by the transformer. The
Diagnostic LED
1 Flash - Air Flow Fault
2 Flashes - Flame No Call for Heat
3 Flashes - Ignition Lockout
Section 1: Operation Instructions
Heater left side panel removed
Fan Control Circuit Board
Figure 6.
ETi 400 High Efficiency Pool and Spa Heater Installation and User's Guide
PS1
PS2
TH
START
NC IN
FAN1
FAN2
L1
UNUSED
GND
R 24 VAC
15