Lennox Prodigy M2 Application Manual page 35

2−Stage Exhaust (cont'd)
Option Option
ECTO 8.16
Enabled when
9 Always
10 Occupied
11 Blower is energized
Units equipped with an A133 board set for VAV operation and two−stage exhaust fans use the A55_P265−11 output to energize the exhaust relay for
stage one when enabled. Stage two will not energize until 0 seconds default (ECTO 8.25) after stage one. Stage 1 will not de−energize until stage two
has been de−energized for 100 Seconds (ECTO 8.22).
VAV units with VFDs could use this option for two stage operation. In that case, the A55_P265−11 output is used to enable the VFD and the exhaust
fan will operate at speed set with ECTO 8.17 (50% default) for stage 1 and ECTO 8.18 for stage 2.
12 12 Always Always
13 13 Occupied Occupied
14 14 Blower is energized Blower is energized
A133 Digital Input 1 (P194 1) A133 Digital Input 1 (P194−1)
15 15
is energized (Enable Switch)
(1)
Settings must be adjusted for proper operation.
Units equipped with an A133 board set for VAV operation and two−stage exhaust fans use the exhaust fan relay for stage one when Digital Input 1
(P194−1) is energized and enabled. The A133_P194−5 output energizes the exhaust fan relay K201 for stage two when Digital Input 2 (P194−2) is
energized and enabled. Stage two will not energize until 0 seconds default (ECTO 8.25) after stage one. Stage 1 will not de−energize until stage two
has been de−energized for 100 Seconds (ECTO 8.22). This option typically would have two building pressure switches connected to the two Digital
Inputs.
VAV units with VFDs could use this option for two stage operation. In that case, the A55_P265−11 output is used to enable the VFD and the exhaust
fan will operate at speed set with ECTO 8.17 (50% default) for stage 1 and ECTO 8.18 (100% default) for stage 2.
Option
VFD Exhaust With Low Speed Cycling
ECTO ECTO
8.16
Enabled when
16 Always
17 Occupied
18 Blower is energized
19 A133 Digital Input 1 (P194−1)
is energized (Enable Switch)
(1)
Settings must be adjusted for proper operation.
Units with exhaust VFDs use this option for variable speed exhaust operation. The A55_P265−11 output is used to enable the VFD. The VFD will vary
the exhaust motor speed to maintain the static pressure setpoint (ECTO 8.20). ECTO 8.20 must be adjusted for this operation. If exhaust operates at
minimum speed for a time period of 30 seconds, it will de−energize for a minimum time period of 30 seconds. Exhaust will energize when feedback
exceeds the setpoint by 10%. This option typically would have a building pressure sensor connected to the Analog Input
The PID loop proportional (P) constant may be adjusted by ECTO 8.23, integral (I) constant may be adjusted by ECTO 8.24, derivative may be ad-
justed by E.CTO 8.25 and the reset value may be adjusted by ECTO 8.22.
VFD Exhaust
20 Always
21 Occupied
22 Blower is energized
A133 Digital Input 1 (P194−1)
23
is energized (Enable Switch)
(1)
Settings must be adjusted for proper operation.
Units with exhaust VFDs use this option for variable speed exhaust operation. The A55_P265−11 output is used to enable the VFD. The VFD will vary
the exhaust motor speed to maintain the static pressure setpoint (ECTO 8.20). ECTO 8.20 must be adjusted for this operation. Exhaust fan will not
cycle off while enabled. This option typically would have a building pressure sensor connected to the Analog Input.
The PID loop proportional (P) constant may be adjusted by ECTO 8.23, integral (I) constant may be adjusted by ECTO 8.24, derivative may be ad-
justed by ECTO 8.25 and the reset value may be adjusted by ECTO 8.22.
Input1 Input1 Input2 Input2
A133 Digital Input 1 A133 Digital Input 1 A133 Digital Input 2 A133 Digital Input 2
(P194−1)(TB18−1) (P194−2) (Pressure
(Pressure Switch S37) (Pressure Switch S37) Switch S39) Switch S39)
A133 Analog Input 2 (TB18 7)(P194 7) (Pressure A133 Analog Input 2 (TB18−7)(P194−7) (Pressure
Sensor A34)
Input Default
A133 Analog Input 2 −0.30"w.c.
(TB18 7) (P194 7) (TB18−7) (P194−7)
(Pressure Sensor A34) (Pressure Sensor A34)
A133 Analog Input 2 A133 Analog Input 2
−0.30"w.c.
(TB18−7)(P194−7)(Pres-
sure Sensor A34) sure Sensor A34)
Page 35
8.
Default
Input energized by pressure switch setting. p g
−0.3"w.c.
−0.42"w.c.(1)
−0.3"w.c.
−0.42"w.c.(1)
−0.3"w.c.
−0.42"w.c.(1)
−0.3"w.c.
−0.42"w.c.(1)
Setpoints During
Setpoints
Smoke Alarm
ECTO Default
8.20 −0.30"w.c.
Setpoints During
Setpoints
Smoke Alarm
8.20 −0.30"w.c.
Power Exhaust Operation
Setpoints # Deadband
ECTO Default ECTO
y p g
8.20 1 0.04 VDC 8.21
(1)
8.23 2 0.25"w.c. 8.24
8.20 1 0.04 VDC 8.21
(1)
8.23 2 0.25"w.c. 8.24
8.20 1 0.04 VDC 8.21
(1)
8.23 2 0.25"w.c. 8.24
8.20 1 0.04 VDC 8.21
(1)
8.23 2 0.25"w.c. 8.24
Minimum Speed
ECTO Default ECTO
(1)
8.19 10% 8.21
Minimum Speed
(1) (1)
8.19 10% 8.21
PRODIGYT M2 UNIT CONTROLLER