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ANALOG OUTPUT PARAMETERS

Use programming steps #22 through #26 to program the
operating parameters for the analog output. Select whether
the analog output is set for heating, cooling or aquastat.
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 or 0 / 4mA" will hold
the analog output device open or closed during unoccupied
times. "Modulating" will modulate the analog output device
to maintain the unoccupied heating or cooling setpoint.).
Enter a proportional band (throttling range) in degrees.

P+I OPTION

The SZ1017N also has a P+I option. Without enabling this
option, stages turn on and off based on temperature vs. set-
point alone, as described above. By enabling this option,
you add a time factor to anticipate heating and cooling.

DI2 AQUASTAT

DI2 may be set as an aquastat function. When DI2 is select-
ed to have an aquastat function, and the analog output is
selected to have an aquastat function, operation is as fol-
lows.

With DI2 "Open", the analog output operates in cooling
mode, and uses selected direct or reverse action. When DI2
is "Closed", the analog output operates in heating mode, and
uses the opposite of the selected direct or reverse action.

SMART RECOVERY

“Smart Recovery” may be enabled. It ramps the setpoint
4°F/hr. when going from the unoccupied mode to the occu-
pied mode. At the beginning of the occupied mode, the
occupied setpoint will be reached, many times without the
need for the second stage to come on. This feature is auto-
matically disabled when DI3 is set to external time clock.

BUILT-IN DELAYS

The SZ1017N has delays built into the programming
sequences to protect equipment. The fan has a minimum on
and off time of 30 seconds. When the fan is in AUTO or
COOL mode, it will come on 30 seconds before the heating
or cooling stages are allowed to sequence on, and remain on
for 30 seconds after the heating or cooling stages sequence
off. Each stage has a minimum on and off time of two min-
utes. There is a minimum of two minutes between when one
stage turns on until the next stage is allowed to turn on, as
well as when one stage turns off until the next stage is
allowed to turn off.

DELAY ON POWERUP

The SZ1017N has an adjustable delay on powerup. When
several thermostats are used at one location, and the power
goes out, most thermostats turn all of the units back on at
the same time on regain of power, creating a peak. The ther-
mostat allows you to set a value, in seconds, where no out-
puts are allowed to turn on for that length of time on
powerup. Setting each unit to a different delay allows you to
soft start your system, and thus prevent this peak.

Checkout & Troubleshooting

CHECKOUT

Note:

The fan has a minimum on and off time of 30 sec-

onds. The heating and cooling stages have a minimum on
and off time of 2 minutes.

You may verify the status of heating and cooling stages and
fan in monitoring screens 5, 6, and 7, which are accessed by
pressing the SERVICE STATUS button.

1.Verify all wiring prior to powering the thermostat.
2. Turn power on. The thermostat will display a momentary

screen with the model number , and then the main moni-
toring screen with the time, day and current temperature.

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Z
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T
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Output
(mA)

DIRECT ACTING

REVERSE ACTING

Output
(mA)

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T
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Output
(mA)