TCS Basys Controls SZ1017a Product Manual - page 15
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15
BUilt-in delAyS
The SZ1017a, SZ1041, SZ1051, and SZ1053 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 or COOL mode,
it will come on 30 seconds before the heating or cooling
devices are allowed to sequence on, and remain on for
2 minutes after the heating or cooling devices sequence
off. Each stage has a minimum on and off time of two
minutes. There is a minimum of 2 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 occupied, see delay on powerup.
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
thermostats 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 pow-
erup. Setting each unit to a different delay allows you to
soft start your system, and thus prevent this peak. This
delay can also be 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 temporary,
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 different.
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 sched-
ule 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.
DIGITAL
APPLICATION
LED
SERVICE SCREEN
CONTROL
SENSOR OR
INPUT
INDICATION?
(DI STATUS SCREEN)
PROVIDED
DEVICE NEEDED
DI1
Fan Proving
YES
CHECK FAN,
YES - turns system mode to "off"
Differential
FAN OK
— requires manual re-start
pressure or
or FAIL
(set system to auto)
current switch
DI1
Equipment
NO
OK
NO
Dry contact, switch. Any type
Monitoring
(DI1 OPEN or CLOSED)
for monitoring and indication
DI2
Service Alert
YES
OK or CHECK DI2
NO
Dry contact, switch. Any type
(DI2 SERVICE OFF or ON)
for monitoring and indication
DI2
Monitor with
NO
OK
YES - shifts setpoint by
Dry contact, switch.
setpoint shift
(DI2 OPEN or CLOSED)
programmed amount
DI2
Cooling Lockout
NO
OK
YES - locks out 2nd
(COOL LOCKOUT ON or OFF)
and 3rd stage cooling
DI3
Filter Service
YES
OK or CHECK FILTER
NO
Differential pressure switch
(FILTER OK or CHECK)
DI3
External Occupancy Override
NO
OK
YES - switches to occupied mode
Dry contact such as twist
(EXT OVER ON or OFF)
as long as contact is made*
timer, light switch, etc.
DI3
External Time Clock Input
NO
OK
YES -input overrides thermostat
Dry contact;
YES
(EXT TIMECLOCK ON or OFF)
occupancy program
external time clock
Occupied?
(TCS part SL1001a)
Digital Input Summary Table
*See delay on occupied.