Supply Air Delivery; System Mode; Gas / Electric Units; Electric / Electric Units - Lennox Prodigy M2 Application Manual

9. Supply Air Delivery

9.1. Blower Delays
The following examples describe blower function for constant air volume (CAV) applications.
9.1.1.

Gas / Electric Units:

The blower is delayed 40 seconds (default ECTO 3.02) after the gas valve is energized and 120 seconds (default ECTO
3.03) after the gas valve is de−energized. The blower operates anytime a heat limit trips.
9.1.2.

Electric / Electric Units:

The default on delay is set to 0 (ECTO 2.02). The blower is delayed off for 20 seconds (default ECTO2.03) after the heating
demand is terminated.
9.1.3.

Cooling Operation:

The default on and off delays are 0, but may be adjusted by ECTOs 4.02 or 4.03. The on−delay time period starts when the
cooling demand is initiated. The off−delay time period starts when the cooling demand is terminated.
9.1.4.

Heat Pump Operation:

The default on−delay is 0 (ECTO 1.02),
b t th but the off−delay default is 20 seconds ff d l d f lt i 20
(ECTO 1.03). The on−delay time period (ECTO 1.03). The on−delay time period
starts when the heat pump heating de- p
mand is initiated. The off−delay time pe-
riod starts when the heat pump heating riod starts when the heat pump heating
demand is terminated. The following demand is terminated. The following
chart summarizes blower delays.
9.2.

Supply VAV Control Mode

The M2 uses the General Purpose GP1 board to control The M2 uses the General Purpose GP1 board to control
optional supply air and power exhaust blower variable p pp y p
frequency drives (VFD). The DIP switch on the GP1 f d i (VFD) Th DIP
board must be set to VAV. The GP1 controls the supply board must be set to VAV The GP1 controls the supply
air VFD or by−pass damper in response to a duct static air VFD or by−pass damper in response to a duct static
pressure reading. VFD powered blowers can be varied pressure reading. VFD powered blowers can be varied
or staged. or staged.
The GP1 sensor inputs and VFD outputs are 0−10VDC. The GP1 sensor inputs and VFD outputs are 0−10VDC.
Duct static pressure sensor (A30) is 0−5 w.c. Duct static pressure sensor (A30) is 0−5 w.c.
The M2 has a maximum supply duct pressure limit The M2 has a maximum supply duct pressure limit
(ECTO 0.21, default 2 w.c.) If this limit is exceeded the (ECTO 0.21, default 2 w.c.) If this limit is exceeded the
control will shut off the unit. After an off delay time of 5 control will shut off the unit. After an off delay time of 5
minutes (ECTO 5.02), the blower will re−energize. The ( ),
control will lockout on the third trip (ECTO 0.22) and an
M2 M2 reset will be required. t ill b i d
Th f ll The following examples describe air delivery for option- i l
al supply air VFD and by−pass damper configurations. al supply air VFD and by pass damper configurations
Refer to table 29 for a summary of ECTO 0 01 options Refer to table 29 for a summary of ECTO 0.01 options.
9.2.1. Local Thermostat Mode, Single Zone CAV Units
ECTO 6.01 option 0 (Default)
This configuration is used for thermostat or DDC applications when the blower is controlled by the G thermostat demand
24VAC input.
506457−01 05/10
d
Unit operation
Gas Heating
p g
Electric Heating
Cooling
HP Heating
it h th GP1
g
( C O )
d ib i d li f
Blower On Delay
Default
40 Sec.
0 Sec.
0 Sec.
0 Sec.
Table 29. ECTO 0.01 Selection Summary
ECTO 0.01 Mode
0 CAV
1 CAV w/bypass damper
3 VAV w/VFD (MSAV)
7 VAV w/VFD
11 VAV w/VFD
15 VAV w/VFD
19 VAV w/VFD
23 VAV w/VFD
27 VAV w/VFD
31 VAV w/VFD
35 VAV w/VFD
39 VAV w/VFD
43 VAV w/VFD
ti
44 VAV w/VFD
51 VAV w/VFD
55 VAV w/VFD
59 VAV w/VFD
63 VAV w/VFD
STG=Staged Control; PID=PID Loop or Modulating Control
Page 36
9.
Blower Off Delay
ECTO Default
3.02 120 Sec.
2.02 20 Sec.
4.02 0 Sec.
1.02 20 Sec.
SMK VT
− −
PID PID
STG STG
PID STG
STG PID
PID PID
STG STG
PID STG
STG PID
PID PID
STG STG
PID STG
STG PID
PID PID
STG STG
PID STG
STG PID
PID PID
Supply Air Delivery
ECTO
3.03
2.03
4.03
1.03
CL HT
− −
PID PID
STG STG
STG STG
STG STG
STG STG
PID STG
PID STG
PID STG
PID STG
STG PID
STG PID
STG PID
STG PID
PID PID
PID PID
PID PID
PID PID