R
2800 LAURA LANE • MIDDLETON, WI 53562 • (800) 288-9383 • FAX (608) 836-9044 • www.tcsbasys.com
4
DIGITAL INPUTS
On the "Programming> Digital Inputs" tab select whether you want
DI1, DI2, DI3, DI4 or DI5 to be “Local” or “Remote”. Local means that
the controller uses its own control program when looking at these
inputs. Remote means that the controller will only recognize input
changes originating from a PC or other communication device.
DI1 can be used for “Boiler Pump 1 Proving” or just “Monitoring”.
If Boiler Pump 1 Proving is selected, the controller will turn on the
Boiler Pump 1 and then wait 30 seconds to make sure the Pump is
on (DI1 is shorted). This can be accomplished with a flow switch, cur-
rent switch or some other device. Any time Boiler Pump 1 is on but
DI1 is not shorted, “Heating” will be shut down. To restart heating,
you must short DI1 to GND.
DI2 can be used for Boiler Pump 2 Proving or Monitoring. If Boiler
Pump 2 Proving is selected, the controller will turn on Boiler Pump
2 and then wait 30 seconds to make sure the Pump is on (DI2 is
closed). This can be accomplished with a flow switch, current switch
or some other device. Any time Boiler Pump 2 is on but DI2 is not
closed, Heating will be shut down. To restart heating, you must short
DI2 to GND.
DI3 can be used for Monitor, External Override or External Time
Clock. If External Override is selected, the controller will use its built-
in time clock and schedule to determine whether to be occupied or
unoccupied, and will also be occupied as long as DI3 is On (closed).
If External Time Clock is chosen, the controller will not use its built
in time clock and schedule to determine whether to be occupied or
unoccupied. The controller will be occupied as long as DI3 is On
(closed) and unoccupied as long as DI3 is Off (Open). NOTE: the
start of an occupied period is delayed by the power-on
delay value.
DI4 is available for monitoring. Select “Boiler/Chiller Alarm” to moni-
tor alarm conditions such as High Temperature, Low Water Level,
etc. (Note: no action will be taken by the controller for this alarm. It
is only being monitored.) Select “Monitoring” to detect more general
conditions.
If monitoring is selected, there is an option to enable Domestic
Hot Water (DHW) Override. When Domestic Hot Water Override is
enabled and DI4 is applied, the boiler pumps will turn off and the
boiler stages will maintain the high limit setpoint regardless of the
reset schedule. This override will operate for a 1 hour maximum,
after which the boiler pump will turn back on and the unit will function
normally.
DI5 can be used for Chiller Pump Proving or Monitoring. If Chiller
Pump Proving is selected, the controller will turn on the Chiller Pump
and then wait 30 seconds to make sure the Pump is on (DI5 is
closed). This can be accomplished with a flow switch, current switch
or some other device. Any time the Chiller Pump 1 is on but DI5 is
not shorted, Cooling will be shut down. To restart cooling, you must
short DI5 to GND.
REMOTE OVERRIDE
Using DI3 you can override the controller (put it in Occupied Mode).
First, using hte drop-down menu select "External Override" as the
function for DI3. Next using the Source drop-down menu select
"Remote" (this means the values come via software). Finally, select
"ON" from the Override drop-down menu and then click "Write
Page". This will bring the controller to occupied mode permanently.
NOTE: You must change the Source back to Local in
order for the controller to go back into normal operation.
BOILER AND PUMP RELAYS
The Boiler Pump and Boiler Stage Relay Outputs can operate in
N.O. (Normally Open) or in N.C. (Normally Closed) mode. The
default is N.O., whereby when the pump or stage output is On, the
relay closes. NOTE: if using N.C. mode, you will need to
have pilot relays to turn on the pumps and stages, and
the LED indication on the SZ2165 will be reversed, i.e.
when the pump or stage is On, the LED is Off and when
the pump or stage is Off, the LED is On. N.C. mode will
have the pumps and stages fail On.
BOILER PUMPS
Choose whether or not to enable Boiler Pump Operation. If not
selected, the boiler pump outputs will not function.
The boiler pumps can be rotated automatically based on their
run times. Choose whether to enable the Automatic Boiler Pump
Rotation, and if so, enter the time in hours that one pump must run
before switching to the other pump.
LEAD BOILER PUMP
Choose whether Boiler Pump 1 or Boiler Pump 2 will be used as
the Lead boiler pump. The other one will be treated as the backup
pump. This selection can be used to manually alternate the boiler
pumps.
ENABLE PUMP LUBE
Choose whether you want to enable the enable pump lube function.
The Enable Pump Lube function turns on the pump every Sunday
morning at 4:00AM for the allotted purge time that is programmed in
for that particular pump.
SERVICE/ALARM STATUS
The Service Status field on the "Monitoring" tab shows various sta-
tus messages depending on which alarms have been setup - OK,
CWS_Hi/Lo (chilled water supply), HWS_Hi/Lo (hot water supply),
BLP1 (bolier pump 1 prove), BLP2 (boier pup 2 prove), DI4 (bolier/
chiller alarm), DI5 (chiler pump prove).
