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59
Table 44—EconoMi$er IV Input/Output Logic
INPUTS OUTPUTS
D
e
m
a
n
d
C
o
n
t
r
o
l
Enthalpy* Compressor NTerminal†
D
eman
d
C
ontro
l
V
t
i
l
t
i
(
D
C
V
)
O
u
t
d
o
o
r
R
e
t
u
r
n
Y1 Y2
Stage Stage
Occupied Unoccupied
V
entilation (DC
V
)
O
ut
d
oor
R
eturn
Y
1
Y
2
1 2
Damper
Below set
(
D
C
V
L
E
D
O
f
f
)
High
(
F
C
l
i
L
E
D
O
f
f
)
Low
On On On On
Minimum position Closed
B
e
l
o
w
s
e
t
(DCV LED Off)
H
i
g
h
(F ree Cooling LED Off)
L
o
w
On Off On Off
M
i
n
i
m
u
m
p
o
s
i
t
i
o
n
C
l
o
s
e
d
Off Off Off Off
Low
(
F
C
l
i
L
E
D
O
)
High
On On On Off
Modulating** (between min.
i
i
d
f
l
l
)
Modulating** (between
l
d
d
f
l
l
)
L
o
w
(F ree Cooling LED On)
H
i
g
h
On Off Off Off
M
o
d
u
l
a
t
i
n
g
(
b
e
t
w
e
e
n
m
i
n
.
position and full-open)
M
o
d
u
l
a
t
i
n
g
(
b
e
t
w
e
e
n
closed and full- open)
Off Off Off Off Minimum position Closed
Above set
(
D
C
V
L
E
D
O
)
High
(
F
C
l
i
L
E
D
O
f
f
)
Low
On On On On
Modulating†† (between min.
i
i
d
D
C
V
i
)
Modulating†† (between
l
d
d
D
C
V
A
b
o
v
e
s
e
t
(DCV LED On)
H
i
g
h
(F ree Cooling LED Off)
L
o
w
On Off On Off
M
o
d
u
l
a
t
i
n
g
†
†
(
b
e
t
w
e
e
n
m
i
n
.
position and DCV maximum)
M
o
d
u
l
a
t
i
n
g
†
†
(
b
e
t
w
e
e
n
closed and DCV
m
a
x
i
m
u
m
)
Off Off Off Off
ma
x
imum)
Low
(
F
C
l
i
L
E
D
O
)
High
On On On Off
Modulating*** Modulating†††
L
o
w
(F ree Cooling LED On)
H
i
g
h
On Off Off Off
M
o
d
u
l
a
t
i
n
g
M
o
d
u
l
a
t
i
n
g
†
†
†
Off Off Off Off
*Forsingleenthalpycontrol,themodulecomparesoutdoorenthalpyto theABCDsetpoint.
†Power at N terminal determines Occupied/Unoccupied setting: 24 vac (Occupied), no power (Unoccupied).
**Modulation is basedon the supply-air sensor signal.
††Modulation is basedon the DCV signal.
***Modulationisbased on thegreater ofDCV andsupply-air sensor signals,between minimumposition andeither maximum position (DCV)or fully open (sup-
ply-air signal).
†††Modulationisbased on thegreater ofDCV andsupply-air sensor signals,between closedand either maximum position (DCV)or fully open(supply-airsig-
nal).
C06053
Fig. 67 --- EconoMi$er IV Functional View
581B,C