Lennox PRODIGY M2 User Manual

9. Supply Air Delivery
Page 36
506457−01 05/10
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),
btth ffdl df lti 20 d
Blower On Delay Blower Off Delay
but the off−delay default is 20 seconds
(ECTO 1.03). The on
−
delay time period
Unit operation
Default ECTO Default ECTO
(ECTO
1
.
03)
.
The
on
−
delay
time
period
starts when the heat pump heating de-
Gas Heating 40 Sec. 3.02 120 Sec. 3.03
pp g
mand is initiated. The off−delay time pe-
riod starts when the heat pump heating
Electric Heating 0 Sec. 2.02 20 Sec. 2.03
r
i
o
d
s
t
ar
t
s w
h
en
th
e
h
ea
t
pump
h
ea
ti
ng
demand is terminated. The followin
g
Cooling 0 Sec. 4.02 0 Sec. 4.03
demand
is
terminated
.
The
following
chart summarizes blower delays.
HP Heating 0 Sec. 1.02 20 Sec. 1.03
9.2. Supply VAV Control Mode
Table 29. ECTO 0.01 Selection Summary
The M2 uses the General Purpose GP1 board to control
ECTO 0.01 Mode SMK VT CL HT
The
M2
uses
the
General
Purpose
GP1
board
to
control
optional supply air and power exhaust blower variable
f d i (VFD) Th DIP it h th GP1
0 CAV − − − −
pppyp
frequency drives (VFD). The DIP switch on the GP1
board must be set to VAV The GP1 controls the supply
1 CAV w/bypass damper PID PID PID PID
board must be set to VAV. The GP1 controls the supply
air VFD or by−pass damper in response to a duct static
3 VAV w/VFD (MSAV) STG STG STG STG
a
i
r
VFD
or
b
y−pass
d
amper
i
n response
t
o a
d
uc
t
s
t
a
ti
c
pressure reading. VFD powered blowers can be varied
7 VAV w/VFD PID STG STG STG
pressure
reading
.
VFD
powered
blowers
can
be
varied
or sta
g
ed.
11 VAV w/VFD STG PID STG STG
or
staged
.
Th
e
G
P1
se
n
so
r in
puts
a
n
d
VFD
outputs
a
r
e
0
−1
0
VD
C
.
15 VAV w/VFD PID PID STG STG
The
GP1
sensor
inputs
and
VFD
outputs
are
0
−
10VDC
.
Duct static pressure sensor (A30) is 0
−
5

w.c.
19 VAV w/VFD STG STG PID STG
Duct
static
pressure
sensor
(A30)
is
0
−
5w
.
c
.
The M2 has a maximum supply duct pressure limit
23 VAV w/VFD PID STG PID STG
The
M2
has
a
maximum
supply
duct
pressure
limit
(
ECTO 0.21
,
default 2w.c.
)
If this limit is exceeded the
27 VAV w/VFD STG PID PID STG
(ECTO
0
.
21
,
default
2w
.
c
.
)
If
this
limit
is
exceeded
the
control will shut off the unit. After an off delay time of 5
31 VAV w/VFD PID PID PID STG
control
will
shut
off
the
unit.
After
an
off
delay
time
of
5
minutes (ECTO 5.02), the blower will re−energize. The
(CO )
35 VAV w/VFD STG STG STG PID
(), g
control will lockout on the third trip (ECTO 0.22) and an
M2 t ill b i d
39 VAV w/VFD PID STG STG PID
M2 reset will be required.
Th f ll i l d ib i d li f ti
43 VAV w/VFD STG PID STG PID
The following examples describe air delivery for option-
al supply air VFD and by pass damper configurations
44 VAV w/VFD PID PID STG PID
al supply air VFD and by−pass damper configurations.
Refer to table 29 for a summary of ECTO 0 01 options
51 VAV w/VFD STG STG PID PID
R
e
f
er
t
o
t
a
bl
e
29
f
or a summary o
f
ECTO
0
.
01
op
ti
ons.
55 VAV w/VFD PID STG PID PID
59 VAV w/VFD STG PID PID PID
63 VAV w/VFD PID PID PID PID
STG=Staged Control; PID=PID Loop or Modulating Control
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.

Lennox PRODIGY M2 Specifications

General

Brand	Lennox
Model	PRODIGY M2
Category	Controller
Language	English