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8
DI1 AQUASTAT
DI1 is used as an aquastat input for two-pipe fan coil
systems.
It is selectable in programming step #34 whether a
closed contact indicates cooling or an open contact indi-
cates cooling.
SMART RECOVERY
Smart Recovery may be enabled (SZ1062 only). It
ramps the setpoint 4°F/hr. when going from the unoccu-
pied and mode to the occupied 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 automatically disabled
when DI3 is set to external time clock.
BUILT-IN DELAYS
The SZ1061 and SZ1062 have delays built into the pro-
gramming sequences to protect equipment. The fan has
a minimum on and off time of 30 seconds. When the fan
is in AUTO mode, it will come on 30 seconds before the
heating or cooling devices are allowed to sequence on.
The auxiliary relay, when set to be a stage of heat or
cool, has a minimum on and off time of two minutes.
DELAY ON POWERUP
The SZ1061 and SZ1062 has an adjustable delay on
powerup and start-up. 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 thermo-
stat 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. This function also occurs when an occupied peri-
od begins to prevent all units from starting at the same
time.
Checkout & Troubleshooting
CHECKOUT
1. Be sure to check and verify all wiring before powering
the SZ1061 and SZ1062.
NOTE: The fan has a minimum on and off time of 30
seconds. A relay for heating or cooling has a minimum
on and off time of 2 minutes.
NOTE: The SZ1061 does not show the day or time.
2. Turn power on. The thermostat will display a momen-
tary screen with the model number, and then the main
monitoring screen with the time, day, fan speed and cur-
rent temperature.
3. Press the PROGRAM SETUP button until you reach
screen #13 and set the System Mode to AUTO.
Continue on until you reach screen #14 and set the
Occupied Fan Mode to AUTO. Go to screen #22 which
allows you to set the occupant setpoint adjustment lim-
its. Change this to +/-20 °F (11.1 °C). Press the
PROGRAM SETUP button once more to store the
change. Then press the FAN OFF button once to exit
the programming.
4. Verify that the thermostat is operating in the occupied
mode by making sure that the top LED is lit. If not, press
the OVERRIDE button. The LED should light up.
5. Take note of the current temperature reading. Press
the WARMER (up) button. The setpoint adjustment
screen should now be showing. Press the WARMER
button until the heating setpoint is greater than the cur-
rent temperature by at least five degrees. The fan will
come on. The W1 relay will come on after 30 seconds.
6. Press the cooler (down) button until the heating set-
point is one degree less than the current temperature.
The heating stage will sequence off. The fan will turn off
2 minutes afterwards.
7. Press the cooler button until the cooling setpoint is
less than the current temperature by at least five
degrees. The fan will come on. The Y1 relay will come
on after 30 seconds.
8. Press the warmer button until the cooling setpoint is
greater than the current temperature by one degree. The
cooling stage will sequence off. The fan will turn off 2
minutes afterwards.
FAN:MED
SZ1062
TCSV
2
.
0
(c)
Heat
Setpoint
Cool
Setpoint
ON
ON
OFF
OFF
Differential
Differential
Offset
Offset
Aux. Relay
Aux. Relay
Differential
ON
OFF
Cool
Differential
ON
OFF
Heat
