Lennox International Inc Merit Series Gas Furnace Heat Fan-Offtime In Seconds

Models: Merit Series Gas Furnace

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HEAT FAN-OFF TIME IN SECONDS

 

 

 

HEAT FAN-OFF TIME IN SECONDS

 

 

 

 

 

 

 

 

NO JUMPER

 

 

 

 

 

 

 

 

 

To adjust fan−off timing, reposition jumper across pins to

 

 

 

 

 

achieve desired setting.

 

 

 

 

60 Second

90 Second

120 Second

180 Second

off Time

off Time

 

off Time

 

off Time

60

90

120

180

60

90

120

180

60

90

120

180

60

90

120

180

FIGURE 36

Thermostat Heat Anticipation

Set the heat anticipator setting (if adjustable) according to the amp draw listed on the wiring diagram that is attached to the unit.

NOTE − Do not secure the electrical conduit directly to the air ducts or structure.

Electrical

1 − Check all wiring for loose connections.

2 − Check for the correct voltage at the furnace (furnace operating). Correct voltage is 120VAC + 10%.

3 − Check amp−draw on the blower motor with inner blow- er panel in place.

Unit Nameplate__________Actual__________

Blower Speeds

Follow the steps below to change the blower speeds.

1 − Turn off electrical power to furnace.

2 − Remove blower access panel.

3 − Disconnect existing speed tap at integrated control speed terminal.

NOTE − Termination of any unused motor leads must be insulated.

4 − Place unused blower speed tap on integrated control PARK" terminal or insulate.

5 − Refer to blower speed selection chart on unit wiring dia- gram for desired heating or cooling speed. See Blower performance data beginning on the next page.

6 − Connect selected speed tap at integrated control speed terminal.

7 − Resecure blower access panel.

8 − Turn on electrical power to furnace.

9 − Recheck temperature rise.

Electronic Ignition

The integrated control has an added feature of an internal Watchguard control. The feature serves as an automatic re- set device for integrated control lockout caused by ignition failure. This type of lockout is usually due to low gas line pressure. After one hour of continuous thermostat demand for heat, the Watchguard will break and remake thermostat demand to the furnace and automatically reset the inte- grated control to begin the ignition sequence.

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Lennox International Inc Merit Series Gas Furnace installation instructions Heat Fan-Offtime In Seconds