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XC21
SunSource
®
Home Energy System
This model series is also SunSourcet ready beginning
with XC21−XXX−230−05 build.
This Dave Lennox Signature
®
Collection heat pump is
factory−equipped with components that make it
SunSource
®
solar−ready. These units can be matched with
solar modules and other optional equipment so that they
can become part of a SunSource
®
Home Energy System.
Units can be upgraded for use with solar equipment at the
time of installation or in the future.
Solar energy is first used to meet cooling/heating
demands. When the outdoor unit is not operating, the
system powers lighting, appliances and other electronic
devices in the home. Any surplus power is sent back to the
utility company for a possible credit (check with your local
utility company for availability).
The SolarSynct package consists of the following
components:
S Lennox
®
Solar Subpanel installed in a Dave Lennox
Signature
®
Collection air conditioner or heat pump
unit.
S Solar modules (1 to 15 may be used to vary the amount
of electricity generated).
S Envoy Communications Gateway monitors solar
power performance.
All components must be ordered separately. See the
Lennox XC21 Engineering Handbook for SunSource
®
Home Energy System component ordering.
Wiring runs from the roof−mounted solar modules to the
outdoor unit. From there, power travels to the home
electrical service panel using the existing outdoor unit
power wiring.
Checklists
Two−Stage Modulation Compressors Field Operational Checklist
Unit Readings Y1 − First Stage
Expected results during Y2
demand (Toggle switch On)
Y2 − Second Stage
COMPRESSOR
Voltage Same
Amperage Higher
CONDENSER FAN MOTOR
Amperage Same or Higher
TEMPERATURE
Ambient Same
Outdoor Coil Discharge Air Higher
Compressor Discharge Line Higher
Indoor Return Air Same
Indoor Coil Discharge Air Lower
PRESSURES
Suction (Vapor) Lower
Liquid Higher
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