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Table 11. Furnace Parameters
Parameter
Description
About
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,
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.
Airflow Profile
- Cooling
Options are:
A - ON: 50% - 30 seconds at 82% - 7-1/2 minutes at 100% and finish cycle 50% / 30 seconds off.
B - ON: 82% - 7-1/2 minutes at 100% and finish cycle off.
C - ON: 100% - No delays; OFF: 45 seconds.
D - no delays.
Continuous Indoor
Blower Airflow
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 Control (IFC) DIP switch setting (non-communicating 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.
Cooling Indoor
Blower Off Delay
The range is 0.0 - 30.0 seconds with a default setting base on equipment type match-up. Adjustment are increments of 10 seconds. Default is 0.0 seconds.
Cooling Indoor
Blower On Delay
The range is 0.0 - 10.0 seconds with a default setting base on equipment type match-up. Adjustment are increments of 1 second. Default is 2.0 seconds.
Dehumidification
Airflow %
Range is 60.0 to 80.0%. Default is 70.0%
Equipment Name
A unique name can be assigned to this component. Name can be up to 29 characters. Name can consist of letters, numbers, special characters and spaces.
Heating Indoor
Blower Off Delay
The range is 60 - 180 seconds with a default setting base on equipment type match-up. Adjustment are increments of 10 seconds.
Heating Airflow
Control Type
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 to maintain a set Discharge
Air Temperature (DAT). For example if 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
Blower On Delay
The range is 15 - 45 seconds with a default setting base on equipment type match-up. Adjustment are increments of 5 seconds.
High Cooling
Airflow
Range of operation of the indoor blower during high 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.
High Heating
Airflow
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 airflow control type used.
