Lennox S40 Installation And Setup Guide

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Table 8. Furnace Parameters
Parameter Description
Low Cooling
Airow
Range of operation of the indoor blower during low cooling
operation.
The range is dependent of indoor unit model and size. Default is
based on cooling demand with an Incremental adjustments of 25
CFM.
Low Heating
Airow
Both range and default setting is based on equipment type
match-up. Adjustments are in increments of 25 CFM. This value
is automatically adjusted by the system based on heating airow
control type used.
Minimum Gas
Heating Off Time
Default is 1.5 minutes. Range is 1.5 to 10 minutes. With increments
of 0.5.
This setting will help with the Alarm 250 limit tripping in zoning
applications where a second zone calls immediately after the
satisfying a gas heating call and there is still residual heat in heat
exchanger.
Reset Furnace
Any installer modications under the furnace tab will be reset back
to the factory defaults if the reset furnace option is used.
Heat Pump
Table 9. Heat Pump Parameters
Parameter Description
About
This screen provides information concerning language supported,
equipment type name, unit model number, unit serial number, unit
nominal capacity, number of heating states, number of cooling
stages, heating capacity by stage, cooling capacity by stage, control
software revision, control model number, control serial number,
control hardware revision, outdoor air temp sensor, protocol revision
number, device product level, 24VAC average power consumption,
24VAC peak power consumption, line voltage average power
consumption, line voltage peak power consumption, outdoor inverter
model number, outdoor inverter rmware version, outdoor fan RPM
prole, unit code, compatible devices list, application code memory
size and micro-controller part number.
Automatic Max
Defrost
(Single and Two-Stage
Lennox Communicating
Heat Pump Units)
When set to ON, the system will always run at MAX DEFROST
when accumulated compressor off time is longer than 30 minutes
and ambient temperature is less than 35°F (1.6°C).
When ambient sensor temperature is higher than 40°F (4.5°C) then
defrost termination will be 90°F (32°C).
This option has two settings, either ON or OFF. Default is OFF.
Table 9. Heat Pump Parameters
Parameter Description
Compressor Shift
Delay ON / OFF
Single and Two-Stage Heat Pumps:
This feature reduces sounds that occur while the unit is cycling in
and out of the defrost mode.
• When enabled, there is a 30-second compressor shift delay
which de-energizes the contactor and ECM fan outputs. After the
delay expires, the contactor and ECM fan outputs are energized.
• When disabled, the reversing valve is shifted by de-energizing
the outputs.
Variable Capacity Heat Pumps:
• The “Shift delay” is not a technician settable parameter on
variable capacity heat pumps.
• “Shift Delay” is always enabled going into and out of a defrost. the
inverter was updated with “slope logic” and shift delay is always
enabled. The shift delay is: Compressor shut off > 4s delay >
reversing valve shifts > 26s delay > compressor restarts.
Compressor Short
Cycle Delay’
(Single and Two-Stage
Lennox Communicating
Outdoor Units)
This feature prevents the compressor from being short cycled
any time the compressor is turned “OFF”. The range is 60 -
300 seconds. Default is 300 seconds and with an incremental
adjustment of 60 seconds. When the system initiates a compressor
short cycle delay, the outdoor unit control’s seven segment display
will count down the delay in minutes 1 to 5 minutes. The sequence
is time remaining and a dash, and will repeat that cycle (5, 4, 3, 2
and 1) until the count down is complete. If the delay timer is change
to let’s say 180 seconds, then the countdown will start at 3.

Lennox S40 Specifications

General

Brand	Lennox
Model	S40
Category	Thermostat
Language	English