Furnace - Lennox S40 Installation And Setup Manual

Table 8. Furnace Parameters
Parameter Description
This screen provides information on unit code, language supported,
equipment type name, unit model number, unit serial number, unit
nominal capacity, number of heating stages, heating capacity by
stage, indoor blower CFM range, control software revision, control
model number, control serial number, control hardware revision,
About discharge air temp sensor, outdoor air temp sensor, protocol
revision number, device product level, factory installed transformer,
24VAC average power consumption, 24VAC peak power
consumption, line voltage average power consumption, line voltage
peak power consumption, compatible devices list, application code
memory size and micro-controller part number.
Options are:
A - ON: 50% - 30 seconds at 82% - 7-1/2 minutes at 100% and
finish cycle 50% / 30 seconds off.
Airflow Profile
- Cooling B - ON: 82% - 7-1/2 minutes at 100% and finish cycle off.
C - ON: 100% - No delays; OFF: 45 seconds.
D - no delays.
The range is 450 - 2000 CFM with a default setting based on
equipment type match-up. Adjustments are in increments of 5 CFM.
NOTE:
All parameter default CFM values are based on Furnace
Continuous Indoor
Control (IFC) DIP switch setting (non-communicating
Blower Airflow
value) prior to power up. This dip switch settings are use
and calculated using CFM conversion tables. They are
then rounded up to closest number on 25 CFM resolution.
Any DIP switch changes made after power up are ignore.
The range is 0.0 - 30.0 seconds with a default setting base on
Cooling Indoor
equipment type match-up. Adjustment are increments of 10
Blower Off Delay
seconds. Default is 0.0 seconds.
The range is 0.0 - 10.0 seconds with a default setting base on
Cooling Indoor
equipment type match-up. Adjustment are increments of 1 second.
Blower On Delay
Default is 2.0 seconds.
Dehumidification
Range is 60.0 to 80.0%. Default is 70.0%
Airflow %
A unique name can be assigned to this component. Name can be
Equipment Name up to 29 characters. Name can consist of letters, numbers, special
characters and spaces.
The range is 60 - 180 seconds with a default setting base on
Heating Indoor
equipment type match-up. Adjustment are increments of 10
Blower Off Delay
seconds.

Furnace

Table 8. Furnace Parameters
Parameter Description
Options for this setting are fixed CFM or fixed DAT (discharge air
temperature). Default is dependent on equipment type match-up.
Fixed CFM is selected as the Heating Airflow Control Type
(parameter default selection), the circulator will operate at a CFM
that is linearly interpolated between Low Heating Airflow and
High Heating Airflow based on the current IFC firing rate. For
example, if the firing rate is 60% and Low Heating Airflow and High
Heating Airflow were set to 500 CFM and 900 CFM respectively
(both parameter values are set during the IFC commission), the
circulator will run at 297 CFM (= 500+ (900-500) *(60-40)/(100-40)
– assuming 40% minimum fire rate.
Fixed Discharge Air Temperature (DAT) control when selected as
Heating Airflow Control Type, the IFC will vary circulator at a CFM
Heating Airflow
to maintain a set Discharge Air Temperature (DAT). For example if
Control Type
the firing rate is 60% and Low Heating DAT and High Heating DAT
were set to 115°F (46°C) and 130°F (54.4°C) respectively (both
parameter values are set during the IFC commission), the IFC will
control the circulator to maintain a DAT at 120°F (48.9°C) (115+
(130-115) *(60-40)/(100-40) – assuming 40% minimum fire rate.
When Fix DAT is enabled, the following parameters are available:
Low Heating Discharge Temp
Range is 105 to 135°F (43.44 to 60.0°C). Adjustable in increments
of 5F (2.78°C). Default is 120°F (51.67°C).
High Heating Discharge Temp
Range is 115 to 145°F (48.89 to 65.56°C). Adjustable in increments
of 5F (2.78°C). Default is 130°F (57.22°C).
Heating Indoor
The range is 15 - 45 seconds with a default setting base on
Blower On Delay
equipment type match-up. Adjustment are increments of 5 seconds.
Range of operation of the indoor blower during high cooling
operation.
High Cooling
The range is dependent of indoor unit model and size. Default is
Airflow
based on cooling demand with an Incremental adjustments of 25
CFM.
Both range and default setting is based on equipment type
High Heating match-up. Adjustments are in increments of 25 CFM. This value
Airflow is automatically adjusted by the system based on heating airflow
control type used.
High HP Airflow
Range is 800.0 to 1100.0 CFM. Default is 967.0 CFM.
The range is 0.0 - 60.0 seconds with a default setting base on
HP Indoor Blower
equipment type match-up. Adjustment are increments of 5 seconds.
Off Delay
Default is 45.0 seconds.
The range is 0.0 - 30.0 seconds with a default setting base on
HP Indoor Blower
equipment type match-up. Adjustment are increments of 5 seconds.
On Delay
Default is 0.0 seconds.
33