4.7 SEQUENCE OF OPERATION - ECM EON
H27.6.3
8. Match up the blower rails with the hangers on the underside of the blower division panel, then slide the
blower assembly back into position.
9. Replace the screws fastening the blower assembly to the blower division panel.
10. Secure harnesses to blower division and junction box. Connect thermostat wiring to the control board.
11. Reinsert the UV light and secure base and bracket.
12. Replace the blower access door.
13. Restore electrical power to the furnace.
14. Routine cleaning of the interior of the recovery coil should not be necessary. If evidence develops indicating that
a cleaning is necessary, it should be done by a trained and qualifi ed service technician. Evidence may include
large amounts of dirt or debris building up in the condensate drain line.
H3.30
ALWAYS DISCONNECT THE ELECTRICAL SUPPLY TO THE FURNACE BEFORE REMOVING
THE BURNER COMPARTMENT ACCESS DOOR.
WARNING
!
!
H27.6.2
THE FURNACE GAS TRAIN IS DESIGNED TO OPERATE AS A SEALED UNIT. BE SURE
THAT THE BURNER COMPARTMENT ACCESS DOOR IS PROPERLY IN PLACE BEFORE
ATTEMPTING TO RESTART THE FURNACE.
CAUTION
!
!
The furnace achieves its high effi ciency in three general areas. First, there is no wasteful standing pilot. The
furnace consumes no gas in between cycles. Secondly, the furnace is designed to allow very small amounts of
excess air in the combustion process. Older furnaces had heat exchangers which were commonly 40% larger
than necessary for complete combustion. While this prevented the creation of carbon monoxide, the heated
excess air was expelled up the chimney where it could not benefi t the interior of the home. Special safety
controls now prevent the formation of carbon monoxide.
The third general area is the recovery of the latent heat contained in the fl ue gas, which is comprised of water
vapor and carbon dioxide. By condensing the fl ue gas in the furnace recovery coil, heat that would otherwise be
wasted to the outdoors, is captured and redirected into the duct system where it contributes to home comfort.
Each pound of condensation formed releases approximately 970 Btu’s. Your furnace may condense up to 1/2
gallon (1.89L) (5 pounds) (2.27kg) of water per hour if running continuously.
This condensation must be properly disposed into a sump or drainage system. The condensate lines must
remain clear and free fl owing. Do not allow plastic drain lines to become pinched or kinked. A blocked drain
line can cause the furnace to operate erratically, or not at all.
IMPORTANT:
Your furnace should be cleaned and inspected annually by a trained and qualifi ed
service technician. Your service technician has the knowledge and test equipment to
determine the condition of your furnace.
1. Room temperature drops causing the room thermostat call for fi rst stage heat by connecting “W1” to “R”.
The control verifi es the limit switch is closed and both low and high pressure switches are open. The
control energizes the exhauster motor on high speed and waits for the low pressure switch to close. The
exhauster remains on high speed and begins a 15 second pre-purge period. The high pressure switch is
ignored. If the low pressure switch does not close within 60 seconds, the control will fl ash “2” on the Red
Status LED, and de-energize the exhauster for 60 minutes.
W415-1243 / E / 11.27.17
UM
71
Summary of Contents for ULTIMATE 9700 Series
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