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DELAY ON POWER UP
The SZ1022, SZ1031, and SZ1035 have an adjustable
delay on power up. When several thermostats are used
at one location, and the power goes out, most thermo-
stats 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 power up.
Setting each unit to a different delay allows you to soft
start your system, and thus prevent this peak.
Note, this
delay is also applied to the start of occupied time.
DAYLIGHT SAVINGS TIME
Beginning in 2007, Daylight Saving Time (DST) in the
U.S. will be extended by having an earlier change to
DST in spring and a delay in switching back to standard
time in fall. However, this change may only be tempo-
rary, as this "new" schedule is only in effect for a 2 year
trial period. After that, the DST schedule may revert
back, stay the same, or be something completely differ-
ent. Products shipped starting in 2007 with firmware ver-
sion 1.5 or higher accommodate the new DST schedule.
Products shipped starting in 2008 with firmware version
2.0 or higher accommodate the new DST schedule and
have the ability to be programmed to accommodate any
future schedules that may be used. Should the schedule
change and you need to customer program the DST
start and end dates, simply enable the "Daylight Savings
Time" option within the software and enter the starting
month + week and the ending month + week.
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 momen-
tary screen with the model number , and then the
main monitoring screen with the time, day, date
(SZ1031 and SZ1035 only), and current temperature.
3. Press the PROGRAM SETUP button until you reach
the screen #14 which allows you to set the occupant
P + I OPTION
The SZ1022, SZ1031, and SZ1035 also have a P+I
option. Without enabling this option, stages turn on
and off based on temperature vs. setpoint alone, as
described above. By enabling this option, you allow a
time factor to be added. This is useful when you are
forced to have a large differential due to equipment size.
At times when the building load is low, the tempera-
ture could potentially sit a few degrees off setpoint for
some time. With the time factor added, the thermostat
would compensate for this, turning on the equipment
even though the temperature had not reached the limits
described above.
DI2 COOL LOCKOUT
DI2 may be set as cool lockout for operation with econo-
mizers. An outdoor temperature switch may be wired in
such that when DI2 is closed, the second stage of cool-
ing is disabled.
SMART RECOVERY
“Smart Recovery” may be enabled to insure occupant
comfort while saving money. It takes the building load
into consideration and ramps the setpoint when going
from the unoccupied 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.
AUXILIARY OUTPUT
An auxiliary relay output is available to output a signal
based on the occupancy status. It is commonly used
with an economizer minimum position control, or to sig-
nal an outdoor air damper to open in occupied times in
lieu of an economizer. It may also be used for lighting
or hot water heaters. Keep in mind that although it is an
isolated relay (separate common terminal), it is rated
at 24 VAC. For loads that exceed this, use an external
relay. It may be set to be open (NO) or closed (NC)
when the thermostat is operating in the occupied mode,
and will be the opposite during the unoccupied mode.
BUILT-IN DELAYS
The SZ1022, SZ1031, and SZ1035 have 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 mode, it will come on 30 sec-
onds before the heating or cooling stages are allowed
to sequence on, and remain on for 2 minutes after the
heating or cooling stages sequence off. Each stage has
a minimum on and off time of two minutes. 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.
MON
11-19-07
12:00 AM 72F
* SZ1022 *
TCS V2.0 (C)
