Download Print this page

Blower Heat Off Delay Timings; Normal Sequence Of Operation; Power Up; Heating Mode - Maytag Amana MES9 Series Installation Instructions Manual

Single-stage gas furnace, type fsp category iv direct or non direct vent air furnace
Hide thumbs

Advertisement

Blower Heat Off Delay Timings

This integrated control module offers selectable heat off de-
lay function. The heat delay may be set to 100 or 150 seconds
by adjusting DIP Switch S1-4 on the Control Module. The delay
is factory shipped at 150 seconds but may be changed to suit
the installation requirements and/or homeowner preference.

Normal Sequence of Operation

Power Up

The normal power up sequence is as follows:
115 VAC power applied to furnace.
Integrated control module performs internal checks.
LED will flash once at power up then remain on.
Integrated control module monitors safety circuits
continuously.
Furnace awaits call from thermostat.

Heating Mode

The normal operational sequence in heating mode is as follows:
R and W thermostat contacts close, initiating a call for
heat.
Integrated control module performs safety circuit checks
Induced draft blower is energized for a 15-second
prepurge.
Igniter warn up begins upon presence of closed pressure
switch contacts.
Gas valve opens at end of igniter warm up period,
delivering gas to burners and establishing flame.
Integrated control module monitors flame presence. Gas
valve will remain open only if flame is detected.
Circulator blower is energized on heat speed following a
thirty (30) second blower on delay.
Furnace runs, integrated control module monitors safety
circuits continuously.
R and W thermostat contacts open, completing the call
for heat.
Gas valve closes, extinguishing flame.
Induced draft blower is de-energized following a fifteen
second post purge.
96% models HUM terminal is de-energized.
For 96% Models: Circulator blower continues running for
the selected heat off delay period Factory set at 150
seconds.
EAC terminal is de-energized
Furnace awaits next call from thermostat.

Cooling Mode

The normal operational sequence in cooling mode is as follows:
R,Y, G thermostat contacts close, initiating a call for cool.
Integrated control module performs safety circuit checks.
Outdoor fan and compressor are energized.
Circulator blower is energized on the cool speed.
96% models 115 VAC EAC terminal is energized.
Furnace circulator blower and outdoor cooling unit run
their appropriate speeds, integrated control module
monitors safety circuits continuously.
R,Y, G thermostat contacts open, completing the call for
cool.
Outdoor fan and compressor are de-energized.
Circulator blower continues running during a cool off
delay period of 65 seconds.
Furnace awaits next call from thermostat.

Fan Only Mode

The normal operational sequence in fan only mode is as follows:
R and G thermostat contacts close, initiating a call for
fan.
Integrated control module performs safety circuit checks.
Circulator blower is energized on heat speed.
96% models 115 VAC EAC terminal is energized.
Circulator blower runs, integrated control module
monitors safety circuits continuously.
R and G thermostat contacts open, completing the call
for fan.
Circulator blower is de-energized.
EAC terminal is de-energized.
Furnace awaits next call from thermostat.

Operational Checks

The burner flames should be inspected with the burner compart-
ment door installed. Flames should be stable, quiet, soft, and blue
(dust may cause orange tips but they must not be yellow). Flames
should extend directly outward from the burners without curling,
floating, or lifting off. Flames must not impinge on the sides of the
heat exchanger firing tubes.

Safety Circuit Description

A number of safety circuits are employed to ensure safe and proper
furnace operation. These circuits serve to control any potential
safety hazards and serve as inputs in the monitoring and diagnosis
of abnormal function. These circuits are continuously monitored
during furnace operation by the integrated control module.

Integrated Control Module

The integrated control module is an electronic device which, if a
potential safety concern is detected, will take the necessary pre-
cautions and provide diagnostic information through an LED.

Primary Limit

The primary limit control is located on the partition panel and
monitors heat exchanger compartment temperatures. It is
a normally-closed (electrically), automatic reset, tempera-
ture-activated sensor. The limit guards against overheating
as a result of insufficient conditioned air passing over the heat
exchanger.

Auxiliary Limit

The auxiliary limit controls are located on or near the circulator
blower and monitors blower compartment temperatures. They are
a normally-closed (electrically), manual-reset sensors. These limits
guard against overheating as a result of insufficient conditioned air
passing over the heat exchanger.

Rollout Limit

The rollout limit controls are mounted on the burner/manifold
assembly and monitor the burner flame. They are normally-closed
(electrically), manual-reset sensors. These limits guard against
burner flames not being properly drawn into the heat exchanger.
38

Advertisement

loading

  Related Manuals for Maytag Amana MES9 Series