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7
door air reset schedule. If the outdoor air is 0°F, the hot
water is controlled at 180°F. If the outdoor air is 60°F,
the hot water is controlled at 110°F.
The setpoint in programming step #19 is set to 145.
(180 + 110) / 2 = 145
The reset setpoint in programming step #20 is set to 30.
(0 + 60) / 2 = 30
The reset factor in programming step #211 is set to
1.167.
(180 - 110) / (60 - 0) = 70 / 60 = 1.167
do2 ModE / PARAMETERS
Digital output two can be selected as either Setpoint1 or
as Setpoint2 entered in programming step #39.
If SP is chosen, programming step #40 will not be
shown. Digital output two will function normally, being
controlled by the Main Setpoint1 entered in program-
ming steps #16 through #21.
If Setpoint2 is chosen, digital output two will be con-
trolled independently based on the setpoint entered in
programming step #40, the mode entered in program-
ming step #33 and the offset and differential entered in
programming step #36 and #37, and the occupied dead-
band entered in programming step #15 or the unoccu-
pied deadband entered in programming step #41.
STAgE ouTPuT PARAMETERS
The SZ1143b will control either two stages of “heating”
or “cooling” or will control one stage of each. Heating
refers to the Relay Output energizing on a "fall in input",
while Cooling refers to the Relay Output energizing on a
"rise in input".
For each stage, you may specify an offset and a differ-
ential value. The offset value is the amount away from
the setpoint a stage will turn off. By assigning a stage a
value other than zero, you “anticipate” that the residual
heat or cooling in the duct or the other stages will bring
the temperature back to setpoint. In most cases, the first
stage is set to zero. The differential value is the differ-
ence between the on and off points.
Setpoint
O N
O N
O N
O N
O FF
O FF
O FF
O FF
Differential
Differential
O ffset
O ffset
Differential
Differential
Deadband
Deadband
ANALog ouTPuT PARAMETERS
Use programming steps #22 through #31 to program
the operating parameters for the analog output. Select
whether the analog output modulates from midpoint
or endpoint. If endpoint is chosen, select whether the
analog output is for “heating” or “cooling” and enter a
setpoint offset. “Heating” refers to the analog output
operating below the setpoint. “Cooling” refers to the
analog output operating above the setpoint. Select direct
or reverse action. Select whether you want the analog
output to modulate from 4 to 20mA or 0 to 20mA. Select
the unoccupied action ("20mA, 0mA or 4mA" will hold
4 20
4 20
4 20
4 20
4 20
4 20
4 20
4 20
12
P
Z
o
n
e
T
e
m
p
Output
(m A)
P
SP
Output
(m A)
DIRECT ACTING
REVERSE ACTING
SP
SP
SP
DB
DB
P
P
Output
(m A)
Output
(m A)
Z
o
n
e
T
e
m
p
DB
DB
DB
DB
P
P
SP
Output
(m A)
Output
(m A)
P
P
Z
o
n
e
T
e
m
p
Output
(m A)
Output
(m A)
DB
DB
SP
DB
DB
DB
DB
12
.5P
SP
SP
Z
o
n
e
T
e
m
p
SPO
SPO
SPO
SPO
SPO
SPO
SPO
SPO
.5P
.5P
.5P
4 20
4 20
4 20
4 20
4 20
4 20
4 20
4 20
12
P
Z
o
n
e
T
e
m
p
Output
(m A)
P
SP
Output
(m A)
DIRECT ACTING
REVERSE ACTING
SP
SP
SP
DB
DB
P
P
Output
(m A)
Output
(m A)
Z
o
n
e
T
e
m
p
DB
DB
DB
DB
P
P
SP
Output
(m A)
Output
(m A)
P
P
Z
o
n
e
T
e
m
p
Output
(m A)
Output
(m A)
DB
DB
SP
DB
DB
DB
DB
12
.5P
SP
SP
Z
o
n
e
T
e
m
p
SPO
SPO
SPO
SPO
SPO
SPO
SPO
SPO
.5P
.5P
.5P
4 20
4 20
4 20
4 20
4 20
4 20
4 20
4 20
12
P
Z
o
n
e
T
e
m
p
Output
(m A)
P
SP
Output
(m A)
DIRECT ACTING
REVERSE ACTING
SP
SP
SP
DB
DB
P
P
Output
(m A)
Output
(m A)
Z
o
n
e
T
e
m
p
DB
DB
DB
DB
P
P
SP
Output
(m A)
Output
(m A)
P
P
Z
o
n
e
T
e
m
p
Output
(m A)
Output
(m A)
DB
DB
SP
DB
DB
DB
DB
12
.5P
SP
SP
Z
o
n
e
T
e
m
p
SPO
SPO
SPO
SPO
SPO
SPO
SPO
SPO
.5P
.5P
.5P
