Penn System 450 C450RBN-1, Руководство по установке

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Note: You must set up Sn-1 and Sn-2 before you
can set up a RSP for your reset control system. Sn-1
is always the Master temperature sensor; typically
an outdoor air temperature sensor. Sn-2 is always
the control loop sensor; typically a boiler or chiller
water supply loop sensor. But Sn-2 can also be a
zone temperature or humidity sensor depending on
your application, and the RSP can be a temperature
or humidity value depending on the Sn-2 Sensor
Type you select in the Sensor Setup screens.
When you select the rES sensor in an output’s
Sensor Selection screen, the output references the
RSP, and System 450 displays the remaining output
setup screens for setting up reset control based on
a calculated (floating) setpoint (RSP) or proportional
band (RSP + Pb).
Note: If you select Sn-1, Sn-2 or Sn-3 in the Sensor
Selection screen, the output references a standard
temperature or humidity sensor; and System 450
displays the remaining output setup screens for
setting up standard control based on the fixed
setpoint or proportional band (SP and EP) you select
for the output.
You can also select a
Shutdown High Temperature
(SdHI) and/or Shutdown Low Temperature (SdLO)
to shut down or limit the outputs that reference the
rES sensor.
You can also enable
Load Balancing (bAL) to
balance the runtimes (relay ON times) of all relay
outputs (only) that reference the rES sensor.
1. In the Reset Setpoint Setup Start screen, press
Next to go to the next screen and begin setting
up the Reset Setpoint. You can set up a floating
Reset Setpoint Sensor Type (rES) that can be
referenced by the outputs in your System 450 reset
control system. You can also select high and low
temperature shutdown values (SdHI and SdLO)
and an unoccupied Setback (SbK) for all Outputs
with reset; and enable Load Balancing for relay
(only) outputs with reset. See the Reset Setpoint
Setup Screens row in the setup screens flow chart in
System 450 menu flow example .
Note: Sn-1 and Sn-2 must be set up in the UI
before the Reset Setpoint Setup Start screen
is available. All Setup Start screens are view-
only; selections cannot be made in Setup Start
screens.
The following figure shows the
Reset Setpoint
Setup Start screen. The remaining figures
in this procedure show the setup parameter
values selected for the RSP, high and low
temperature shutdown, unoccupied setback,
and load balancing that are used by the outputs
setup to reference the rES sensor (Output 2
and Output 4) in the control system example in
Figure 3.
Figure 15: Reset Setpoint Setup Start screen
2. In the Minimum Reset Setpoint Selection screen,
press Up or Down to select the Minimum Reset
Setpoint value for the controlled condition (sensed
at Sn-2). The selected Minimum Reset Setpoint
(MNSP) value establishes the lowest (temperature or
humidity sensed at Sn-2) setpoint value that outputs
with reset control can reference. The MNSP value
and the Maximum Reset Setpoint (MXSP) value
establish the total (temperature or humidity) range
for the floating RSP value. See Figure 14. Press Next
to save your selection and go to the next screen.
The following figure shows a Minimum Reset
Setpoint value of 110 (°F).
Figure 16: Minimum Reset Setpoint Selection screen
3. In the Maximum Reset Setpoint Selection screen,
press Up or Down to select the Maximum Reset
Setpoint value for the controlled condition (sensed
at Sn-2). The selected Maximum Reset Setpoint
(MXSP) value establishes the highest (temperature
or humidity sensed at Sn-2) setpoint that outputs
with reset control can reference. The MXSP value
and the MNSP value establish the total (temperature
or humidity) range for the floating RSP value. See
Figure 14. Press Next to save your selection and go
to the next screen.
The following figure shows a Maximum Reset
Setpoint value of 180 (°F).
Figure 17: Maximum Reset Setpoint Selection screen
4. In the Reset Range Start Temperature Selection
screen, press Up or Down to select the Reset Start
Temperature value (sensed at the Master sensor
Sn-1). The Reset Start Temperature (RSTR) value
and the Reset End Temperature (RENd) value
establish the temperature range over which the RSP
is calculated. RSTR and RENd are sensed at the Sn-1
Master sensor (typically outdoor air temperature).
RSTR defines the high limit of temperature range
and corresponds with MNSP. As the outdoor air
temperature decreases below the RSTR, the RSP is
driven from the MNSP towards MXSP. See Figure
14.Press Next to save your selection and go to the
next screen.
System 450 Series Reset Control Modules with Real-Time Clock and Relay Output Installation Guide 10