TCS Basys Controls SZ2165 Product Manual page 6

PRoPoRtionAL + integRAL
The Proportional + Integral function implements a way to anticipate
the need for heating using the boiler stages. This function works in
conjunction with the programmed offsets and differentials. Select
whether to enable the Proportional + Integral function. By default,
this function is disabled when the "Integral Setting" is zero. When
enabled, the integral setting can be from 1 to 255. Larger numbers
speed up the response, while smaller numbers slow down the
response.
temPeRAtURe inPUt CALiBRAtion
The six tempera-
ture inputs are fac-
tory calibrated. However,
depending on the appli-
cation (long wire runs,
etc.), there may need
to be a field adjustment
done to these readings.
The "Adjusted Reading"
is the reading that the
SZ2165 actually uses for
control. The Offset Value
is the number of degrees
that the actual input temperature has been adjusted. For example:
You measure the hot water supply temperature and it reads 71°.
The SZ2165 reading is 72° and the Hot Water Supply Temperature
already has an offset of -2.0°. All you need to do is change the offset
value to -3.0° and you're done. The SZ2165 will now read 71°.
The Hot Water Supply and Return inputs are scaled 40 to 240°F (4.4
to 115.6°C). The Chilled Water Supply and Return inputs are scaled
0 to 100°F (-17.8 to 37.8°C). The Mixed Water input is scaled 20 to
220°F (-6.7 to 104.4°C). The Outdoor input is scaled -40 to 160°F
(-40 to 71.1°C). These ranges are fixed and cannot be changed.
hot/ChiLLed WAteR temPeRAtURe ALARmS
Choose whether to enable High and Low Water Temperature Alarms.
If enabled, you will need to enter a High and Low Limit for each
desired Water Temp Alarm.
Ai PReSSURe RAnge
The boiler can be controlled by either Hot Water Supply Temperature
or by Gauge Pressure. If controlled by gauge pressure, choose the
range of the pressure transducer as being either 0 to 100 psi, 0 to
500 psi, or custom. If custom select 0 to 100 psi and fill in the AI
pressure range high limit.
BoiLeR StAge RotAtion
Choose whether to enable Boiler Stage Rotation. Boiler rotation is
cyclical, i.e. before rotation, Boiler 1 is the first stage, Boiler 2 is the
second stage, Boiler 3 is the third stage and Boiler 4 is the fourth
stage. After one rotation, Boiler 2 is the first stage, Boiler 3 is the
second stage, Boiler 4 is the third stage and Boiler 1 is the forth
stage. If using Boiler Stage Rotation, select the number of weeks
between rotations and select the time of day that you would like the
rotation to occur, or enable rotation based on runtime, then enter the
time between change (5 hours to 1000 hours).
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BoiLeR StAgeS
Select the number of Boiler Stages that will be used in the Boiler
Stage Rotation. If using 4 stages, you can select to "Swap" stages
1 & 2 with stages 3 & 4. This is useful if using two boilers with two
stages each.
BoiLeR StAge oRdeRing
Select the boiler stage ordering. The term Boiler refers to the physi-
cal connections to the SZ2165. The term Stage refers to the order
in which the boiler stages cycle on and off. The factory default is to
have Boiler 1 be Stage 1, Boiler 2 be Stage 2, Boiler 3 be Stage 3
and Boiler 4 be Stage 4. Note: the boiler stages can be placed in any
order whether using boiler rotation or not. If boiler rotation is used,
this is the starting order, after which the boiler stages will be rotated
in order.
ChiLLeR 1 / PUmP enABLe
Chiller Stage 1 can either be the first of two stages of chiller control,
or it can be treated like a pump (or enable) function. If selected as
a pump (or enable) function, outdoor air temperature will determine
when this output energizes. If selected as chiller stage 1, chilled
water temperature will determine when this output energizes.
ChiLLeR StAge RotAtion
If Chiller Stage 1 was not selected to be a pump in the above step,
choose whether to enable Chiller Stage Rotation. If using Chiller
Stage Rotation, select the number of weeks between rotations and
select the time of day which you would like the rotation to occur.
Note: the chiller stages can be placed in any order whether using
chiller rotation or not. Chiller Stage 1 must not be enabled as a
Pump. If chiller rotation is used, this is the starting order, after which
the chiller stages will be alternated.
ChiLLeR StAge oRdeRing
Select the chiller stage ordering. The term Chiller refers to the physi-
cal connections to the SZ2165. The term Stage refers to the order
in which the chiller stages cycle on and off. The factory default is to
have Chiller 1 be Stage 1 and Chiller 2 be Stage 2.
AnALog oUtPUt 1
Analog output one on the SZ2165 can be used to control Hot Water
Supply Temperature, Mixed Water Temperature or control based on
Pressure.
During the occupied time, an analog output modulates to maintain a
heating or cooling temperature setpoint. During the unoccupied time
you will need to choose whether the analog output will modulate,
remain at 20mA, or remain at (0 or 4)mA.
A proportional band (throttling range), whether you want the ana-
log output to modulate from 4 to 20mA or 0 to 20mA, and direct or
reverse action must also be programmed.
For control without "Integral" and "Derivative", enter 0 for both. The
proportional band is 0 to 100%, while the integral and derivative val-
ues are numbers from 0 to 255. The default PID values for AOI are
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