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505328M 06/09
PROGRAMMABLE THERMOSTATS
Your Lennox system may be controlled by a
programmable thermostat. These thermostats provide the
added feature of programmable time-of-day setpoints for
both heating and cooling. Refer to the user’s information
manual provided with your particular thermostat for
operation details.
PRESERVICE CHECK
If your system fails to operate, check the following before
calling for service:
S
Check to see that all electrical disconnect switches are
ON.
S
Make sure the room thermostat temperature selector
and system switch (HEAT, COOL and AUTO) are
properly set.
S
Check for any blown fuses or tripped circuit breakers.
S
Make sure unit access panels are in place.
S
Make sure air filter is clean.
S
If service is needed, locate and write down the unit
model number and have it handy before calling.
OPTIONAL ACCESSORIES
Optional accessories for the XP15 include the following
(also, see Engineering Handbook for more details):
S
Compressor starter kit
S
Low ambient kit
S
Vapor line drier
S
Wire tie kit
S
Snow Guard (X8782)
S
Snow Shield Kit (44W14)
Start−Up and Performance Checklist
Customer
Address
Indoor Unit Model
Serial
Outdoor Unit Model
Serial
Notes:
START−UP CHECKS
Refrigerant Type:
Rated Load Amps
Actual Amps
Rated Volts
Actual Volts
Condenser Fan Full Load Amps
Actual Amps:
COOLING MODE
Vapor Pressure:
Liquid Pressure:
Supply Air Temperature:
Ambient Temperature:
Return Air Temperature:
HEATING MODE
Vapor Pressure:
Liquid Pressure:
Supply Air Temperature:
Ambient Temperature:
Return Air Temperature:
System Refrigerant Charge (Refer to manufacturer’s information on unit or installation instructions for required subcooling and approach
temperatures.)
Subcooling:
A
B
=
SUBCOOLING
Saturated Condensing Temperature (A)
minus
Liquid Line Temperature (B)
Approach:
A
B
=
APPROACH
Liquid Line Temperature (A)
minus
Outdoor Air Temperature (B)
Indoor Coil Temp. Drop (18 to 22°F)
A
B
=
COIL TEMP DROP
Return Air Temperature (A)
minus
Supply Air Temperature (B)
