Operating Instructions; To Start Furnace; To Shut Down Furnace - McQuay Maverick I MPS006AG Series Installation And Maintenance Manual

8 Thermostat is satisfied and opens.
9 The gas valve is de-energized and closes, shutting down the
burner flame.
10 The control board will de-energize the inducer after a five
second post purge.
11 The circulating air blower is de-energized after 90 seconds.
The integrated control is a three ignition system.
After a total of three cycles without sensing main burner
flame, the system goes into a 100% lockout mode. After one
hour, the ignition control repeats the prepurge and ignition
cycles for 3 tries and then go into 100% lockout mode again. It
continues this sequence of cycles and lockout each hour until
ignition is successful or power is interrupted. During the
lockout mode, neither the ignitor or gas valve will be
energized until the system is reset by turning the thermostat to
the "OFF" position or interrupting the electrical power to the
unit for 3 seconds or longer. The induced draft blower and
main burner will shut off when the thermostat is satisfied.
The circulating air blower will start and run on the heating
speed if the thermostat fan switch is in the "ON" position.
The integrated furnace control is equipped with diagnostic
LED. The LED is lit continuously when there is power to the
control, with or without a call for heat. If the LED is not lit,
there is either no power to the control or there is an internal
component failure within the control, and the control should
be replaced.
If the control detects the following failures, the LED will flash
on for approximately 1/4 second, then off for 3/4 second for
designated failure detections.
1 Flash: Failed to detect flame within the three tries for
ignition.
2 Flash: Pressure switch or induced draft blower problem
detected.
3 Flash: High limit or auxiliary limit open.
4 Flash: Flame sensed and gas valve not energized or flame
sensed with no "W" signal.
5 Flash: Overtemperature switch open.

Operating Instructions

This unit is equipped with integrated furnace control. This
device lights the main burners each time the room thermostat
(closes) calls for heat. See operating instructions on the back
of the furnace/controls access panel.
▲ ▲
!
Do not attempt to manually light this furnace with a match or
any open flame. Attempting to do so can cause an
explosion or fire resulting in property damage, personal
injury or death.
16
DANGER
To Start The Furnace
1. STOP! Read the safety information on the Operating
Instructions Label located on this unit.
▲ ▲
!
If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal
injury or loss of life.
2 Set the thermostat to its lowest setting.
3 Turn off all electric power to the unit.
4 This unit does not have a pilot. It is equipped with an
ignition device which automatically lights the burner. Do
NOT try to light the burner by hand.
5 Remove control door/access panel.
6 Move switch to the "OFF" position.
7 Wait five (5) minutes to clear out any gas. Then smell for
gas, including near the floor. If you smell gas, STOP!
• Do not try to light any unit.
• Do not touch any electric switch; do not use any phone
in your buiding.
• Immediately call your gas supplier from a neighbor's
phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire
department.
If you don't smell gas, go to the next step.
8 Move from "OFF" position to "ON" position.
9 Replace the control door.
10 Turn on all electric power to the unit.
11 Set the thermostat to the desired setting.
12 If the unit will not operate, follow the instructions below on
how to shut down the furnace.
▲ ▲
!
The spark ignitor and ignition lead from the ignition control
are high voltage. Keep hands or tools away to prevent
electrical shock. Shut off electrical power before servicing
any of the controls. Failure to adhere to this warning can
result in personal injury or death.
The initial start-up on a new installation may require the
control system to be energized for some time until air has bled
through the system and fuel gas is available at the burners.

To Shut Down Furnace

1 Set the thermostat to the lowest setting.
2 Turn off all electric power to the unit if service is to be
performed.
3 Remove control door.
4 Move switch to the "OFF" position.
5 Replace control door.
DANGER
DANGER
IM 861