Lennox PRODIGY M2 User Manual

10. Discharge Air Control
Page 44
506457−01 05/10
To use example values, set the following parameters:
S ECTO 8.02 – DACC_RAT_RS_SP – Set to 70°F
S ECTO 8.03 – DACC_RAT_RS_Proportional_Band – Set to 10°F
S ECTO 8.04 – DACC_ RAT_ RS_Adjustment_Band − Set to 10°F (this setting enables DACC return air reset).
10.4. Discharge Air Cooling Total Reset Limit
ECTO 8.01 (default=10) defines the total DACC setpoint reset limit. This total limit is the sum of both return and outdoor
DACC resets. This parameter limits total DACC_SP adjustment band and overrides the adjustment bands for RAT and OAT
(ECTO 8.07 & 8.04) if necessary.
Table 31. Discharge Air Cooling ECTO Parameters Summary
Control Parameter
No. Name
Control Value
Min. Default Max
Units Description
5.04 CL_Staging 0 2 4 Option
Cooling staging options:
0− No cooling operation
1− Basic Tstat operation. Two cooling stages. Units with Economizers
Y1=Free Cooling, Y2=adds all mechanical stages.
2− Basic Tstat operation. Two cooling stages. Units with Economizers
Y1=Free Cooling, Y2=adds first stage of mechanical.
3− Basic Tstat operation. Three cooling stages. Y1 only = first stage, Y2 only =
second stage, Y1+Y2=third stage. Units with Economizers Y2 only adds
first stage of mechanical, Y1+Y2 adds first and second stage of mechani-
cal.
4− Discharge air control. Up to four stages.
6.01 System_Mode 0 0 12 Option
System mode of operation.
Control
Value System Mode Backup Mode
0 Local Thermostat None
1 Zone Sensor None
2 Zone Sensor Local Thermostat
3 Zone Sensor Return Air Sensor
4 Remote Demand None
5 Remote Demand Local Thermostat
6 Remote Demand Return Air Sensor
7 Remote Demand Zone Sensor
8 Future Use None
9 Future Use Local Thermostat
10 Future Use Return Air Sensor
11 Future Use Zone Sensor
12 A138 4−Stg. Tstat Interface None
7.16 DACC_OCP_SP
124
80
161
55
183
40
Counts Discharge Air Control Cooling setpoint during occupied period.
7.17
DACC_
UnOCP_SP
124
80
146
65
183
40
Counts
X:DegF
Discharge Air Control Cooling setpoint during unoccupied period.
7.18 DACC_Stg_DB
7
5
7
5
30
20
Counts
V:DegF
Discharge Air Control Cooling stage deadband.
7.19
DACC_&_FAC_
StgUp_Delay
0
0
45
180
225
900
Counts
B: Sec.
Discharge Air Control Cooling and Fresh Air Cooling stage−up delay.
7.20
DACC_&_FAC_
StgDn_Delay
0
0
30
120
150
600
Counts
B: Sec.
Discharge Air Control Cooling and Fresh Air Cooling stage−down time delay.
7.21 DACC_Stg_Diff
3
2
3
2
30
20
Counts
V:DegF
Discharge Air Cooling stage differential.
8.01
DACC_RS_
Total_LT
7
5
15
10
29
20
Counts
V:DegF
Discharge Air Control Cooling total reset limit. This limits the total DACC reset
allowed. Also used to reset free cooling setpoint (6.23).
8.02
DACC_RAT_RS
_SP
124
80
139
70
169
50
Counts
X:DegF
Discharge Air Control Cooling return air reset setpoint. Also used to reset free
cooling setpoint (6.23).
8.03
DACC_RAT_
RS_Proportion-
al_ Band.
1
1
15
10
44
30
Counts
V:DegF
Discharge Air Control Cooling return air reset proportional band. Also used to
reset free cooling setpoint (6.23).
8.04
DACC_RAT_
RS_ Adjust_
Band
0
0
0
0
44
30
Counts
V:DegF
Discharge Air Control Cooling return air reset adjustment band.
0 disables return air cooling reset. Also used to reset free cooling setpoint
(6.23).
8.05
DACC_OAT_
RS_SP
50
100
81
80
144
40
Counts
Y:DegF
Discharge Air Control Cooling outdoor air temperature cooling reset setpoint.
Also used to reset free cooling setpoint (6.23).

Lennox PRODIGY M2 Specifications

General

Brand	Lennox
Model	PRODIGY M2
Category	Controller
Language	English