Lennox SCH036 Installation Instructions Manual Download Page 55

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Page 55

SGH/SCH036, 060, 120, 240

TABLE 34

ECONOMIZER OPERATION - Zone Sensor Mode

ÁÁÁÁÁÁÁÁÁÁ

DEMAND

ÁÁÁÁÁÁÁÁÁ

DAMPER POSITION

UNOCC.

ÁÁÁÁÁÁÁÁÁ

DAMPER POSITION

OCCUPIED

ÁÁÁÁÁÁÁÁÁ

MECHANICAL COOLING

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

OUTDOOR AIR IS

NOT SUITABLE

FOR FREE COOLING

ÁÁÁÁÁÁÁÁÁÁ

OFF

ÁÁÁÁÁÁÁÁÁ

CLOSED

ÁÁÁÁÁÁÁÁÁ

CLOSED

ÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁ

CLOSED

ÁÁÁÁÁÁÁÁÁ

MINIMUM

ÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁ

Cooling Stage 1

ÁÁÁÁÁÁÁÁÁ

CLOSED

ÁÁÁÁÁÁÁÁÁ

MINIMUM

ÁÁÁÁÁÁÁÁÁ

COMPRESSOR 1

ÁÁÁÁÁÁÁÁÁÁ

Cooling Stage 2

ÁÁÁÁÁÁÁÁÁ

CLOSED

ÁÁÁÁÁÁÁÁÁ

MINIMUM

ÁÁÁÁÁÁÁÁÁ

COMPRESSOR 1 & 2

ÁÁÁÁÁÁÁÁÁÁ

Cooling Stage 3

ÁÁÁÁÁÁÁÁÁ

CLOSED

ÁÁÁÁÁÁÁÁÁ

MINIMUM

ÁÁÁÁÁÁÁÁÁ

COMPRESSOR 1, 2, & 3

ÁÁÁÁÁÁÁÁÁÁ

Cooling Stage 4

ÁÁÁÁÁÁÁÁÁ

CLOSED

ÁÁÁÁÁÁÁÁÁ

MINIMUM

ÁÁÁÁÁÁÁÁÁ

COMPRESSOR 1, 2, 3, & 4

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

OUTDOOR AIR IS

SUITABLE

FOR FREE COOLING

ÁÁÁÁÁÁÁÁÁÁ

OFF

ÁÁÁÁÁÁÁÁÁ

CLOSED

ÁÁÁÁÁÁÁÁÁ

CLOSED

ÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁ

CLOSED

ÁÁÁÁÁÁÁÁÁ

MINIMUM

ÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁ

Cooling Stage 1

ÁÁÁÁÁÁÁÁÁ

MODULATING

ÁÁÁÁÁÁÁÁÁ

MODULATING

ÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁ

Cooling Stage 2

ÁÁÁÁÁÁÁÁÁ

FULL OPEN*

ÁÁÁÁÁÁÁÁÁ

FULL OPEN*

ÁÁÁÁÁÁÁÁÁ

COMPRESSOR 1

ÁÁÁÁÁÁÁÁÁÁ

Cooling Stage 3

ÁÁÁÁÁÁÁÁÁ

FULL OPEN*

ÁÁÁÁÁÁÁÁÁ

FULL OPEN*

ÁÁÁÁÁÁÁÁÁ

COMPRESSORS 1 & 2

ÁÁÁÁÁÁÁÁÁÁ

Cooling Stage 4

ÁÁÁÁÁÁÁÁÁ

FULL OPEN*

ÁÁÁÁÁÁÁÁÁ

FULL OPEN*

ÁÁÁÁÁÁÁÁÁ

COMPRESSORS 1, 2, 3, & 4

*Damper will modulate to maintain 55

F supply air when parameter 164 is changed to setting “0”. Note - Modulating dampers adjust to control supply air

(RT6) to 55

F (13

C).

Service

To maintain efficiency and longevity, your equipment must
be serviced yearly by a qualified service technician. Failure
to provide proof of service can void warranty.

A-Lubrication

All motor bearings are prelubricated. No further lubrication
is required.

B-Filters

Units are equipped with filters as shown in table 35. Units
will accept 4” filters. Filters should be checked monthly and
replaced when necessary with filters of like kind and size.
Take note of air flow direction marking on filter frame when
reinstalling filters.

NOTE-Filters must be U.L.C. certified or equivalent for use
in Canada.

TABLE 35

Number and Size of Filter By Unit

SG/SC Unit

Qty

Filter Size - inches (mm)

036, 060

16 X 20 X 2 (406 X 508 X 51)

120

20 X 25 X 2 (508 X 635 X 51)

240

20 X 20 X 2 (508 X 508 X 51)

WARNING

Label all wires prior to disconnection
when servicing controls. Wiring errors
can cause improper and dangerous op
eration. Verify proper operation after
servicing.

WARNING

Electric shock hazard and danger of
explosion. Can cause injury, death or
product or property damage. Turn off
gas and electrical power to unit before
performing any maintenance or
servicing operations on the unit. Follow
lighting instructions attached to unit
when putting unit back into operation
and after service or maintenance.

C-Burners (SG Units)

Periodically examine burner flames for proper appearance
during the heating season. Before each heating season
examine the burners for any deposits or blockage which may
have occurred.

1- Turn off both electrical power and gas supply to unit.

2- Open burner compartment access panel.

3- Remove and retain screws securing burner box top cap.

4- Remove and retain two screws securing burners to

burner support and lift the individual burners or the
entire burner assembly from the orifices. See figure 39
for 036 & 060 units and figure 40 for 120, 240 units.
Clean burners as necessary.

5- Locate the ignitor under the right burner for 036 and

060 units. See figure 41. Locate the ignitor under the
left burner for 120 and 240 units. See figure 43 and
table 36. Use appropriately sized twist drills or feeler
gauges to check the spark gap as shown in figure 42.

6- Replace burners and secure with retained screws.

7- Replace access panel.