2800 LAURA LANE
❘
MIDDLETON, WI 53562
❘
(800) 288-9383
❘
FAX (608) 836-9044
❘
www.tcs-basys.com
15
DELAY ON POWERUP
The SZ1017a, SZ1041, SZ1051 and SZ1053 have an
adjustable delay on powerup. When several thermostats are
used at one location, and the power goes out, most ther-
mostats turn all of the units back on at the same time on
regain of power, creating a peak. The thermostat allows you to
set a value, in seconds, where no outputs 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 and fan in
monitoring screens 5, 6, and 7, which are accessed by press-
ing 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
monitoring screen with the time, day,
date (SZ1041, SZ1051 and SZ1053
only) and current temperature.
3. Press the PROGRAM SETUP button
until you reach the screen # 14 which
allows you to set the occupant setpoint adjustment limits.
Change this to +/-20 °F (11.1 °C). Press the PROGRAM
SETUP button once more to store the change. Then press
the SERVICE STATUS button once to exit the program-
ming.
4. Press the FAN SWITCH button
to access the fan mode and
change the mode to AUTO.
Press the FAN SWITCH button
once more to store the change. Press the SYSTEM
SWITCH button to access the system mode and change
the mode to AUTO. Press the SYSTEM SWITCH button
once more to store the change.
5. 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.
6. 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 current temperature
by at least five degrees. The fan will come on. The heating
stage(s) will sequence on after 30 seconds.
7. Press the cooler (down) button until the heating setpoint is
one degree less than the current temperature. The heating
stage(s) will sequence off. The fan will turn off 2 minutes
after the last heating stage.
8. 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 cooling stage(s) will sequence on after 2 min-
utes.
9. Press the warmer button until the cooling setpoint is
greater than the current temperature by one degree. The
cooling stage(s) will sequence off. The fan will turn off 2
minutes after the last cooling stage.
10. For a heating or cooling analog output: Take note of the
room (and discharge) air temperatures. If the analog output
is set for Cooling, press the Cooler button until the cooling
setpoint is less than the current room temperature by at
least 5°. The cooling device should start operating. If the
analog output is set for Heating, press the Warmer button
until the heating setpoint is greater than the current room
temperature by at least 5°. The heating device should start
operating.
11. For an economizer analog output: Take note of the dis-
charge and outdoor air temperatures. Go to programming
step #30a (for the SZ1051) or #31b (for the SZ1041) and
set the outdoor air setpoint 5° greater than the outdoor air
temperature. Go to programming step #32b (for the
SZ1041) or #31a (for the SZ1051) and set the discharge air
setpoint 10° less than the discharge air temperature. Press
the Cooler button until the cooling setpoint is less than the
current room temperature by at least 5°. The damper
should now be fully open. Raising the discharge air set-
point, will modulate the damper closed. Raising the cool-
ing setpoint above the room temperature or lowering the
outdoor air setpoint below the outdoor air temperature will
shut the damper to minimum position.
12. Go back to programming step #14 and set the setpoint
adjust limit back to the desired value. Make any other
changes in programming, clock, and schedule. Set the fan
and system modes to their desired settings.
13. If using remote sensor(s), verify that the reading is correct.
If not, see
Wrong Temperature Display
in
Troubleshooting
section.
TROUBLESHOOTING
No Display
Check for 24 VAC on terminals “+24” and “-24”. Check the
cable connecting the cover to the base for a good connection.
Fan Does Not Come On
The fan is on whenever the fan LED is on. If the fan should
be on, but the fan LED is off, check the fan and system switch
modes, and the unoccupied fan mode in programming. If the
fan is off but the fan LED is on, check wiring. Short terminals
“R” to “G” and see if the fan comes on. This is a check for a
mechanical relay failure.
11-19-01