Greystone Energy Systems RPC Series User manual

IN-GE-RPCXXXBAC-01-02 03/19 Page 1 Copyright © Greystone Energy Systems, Inc. All Rights Reserved Phone: [phone] Web: www.greystoneenergy.com
INTRODUCTION
The room pressure transmitter is used to measure dierential pressure
in the range of 0.125 to 1"wc or 30 to 250 Pa. It combines precision high
sensitivity silicon sensing capabilities and the latest ASIC technology
to substantially reduce oset errors due to changes in temperature,
stability to warm up, long term instability and position sensitivity. It
is ideal for monitoring pressure for air or other clean inert gas. The
device has an on-board auto-zero function, backlit LCD and alarm
function with silence switch plus a native BACnet® RS-485 MS/TP
network connection.
BEFORE INSTALLATION
Read these instructions carefully before installing and commissioning the room pressure transmitter.
Failure to follow these instructions may result in product damage. Do not use in an explosive or hazardous
environment, with combustible or ammable gases, as a safety or emergency top device or in any other
application where failure of the product could result in personal injury. Take electrostatic discharge
precautions during installation. Do not exceed the device ratings.
MOUNTING
The room pressure transmitter mounts directly on a wall or onto an electrical wall box. For the most
accurate results, units should be mounted on an inside wall to a wall box ve feet from the oor. Do not
mount the sensor near doors, opening windows, supply air diusers, or other known air disturbances.
Avoid areas where the sensor is exposed to vibrations or rapid temperature changes. To prevent erroneous
readings due to air disturbances within the wall cavity, seal the conduit leading to the junction box.
The cover is hooked to the base at the top edge and must be removed from the bottom edge rst. Use
a small Phillips screwdriver to loosen the security screw as shown in Figure 1. (Complete removal is not
required). Use a screw driver to carefully pry each bottom corner if necessary. Tip the cover away from the
base and sit it aside as shown in Figure 2.
The PCB must be removed from the base to access the mounting
holes. Follow usual anti-static procedures when handling the PCB and
be careful not to touch the sensors. The PCB is removed by pressing
the enclosure base to unsnap the latch near the bottom edge, then
the PCB can be lifted out of the base as shown in Figure 3.
Set the PCB aside until the base is mounted on the wall. For added
protection, place the PCB in the supplied anti-static bag.
Mount the base by screwing it to an electrical box or directly to the
wall as shown in Figure 4.
After the base is screwed to an electrical box or the wall using the
appropriate holes, remove the PCB from the anti-static bag, feed
connection wires through center hole and place the top of the PCB
into the PCB holders on the backplate and snap the bottom of the
PCB into place as shown in Figure 4.
Make wire connections as per the Wiring Illustrations on Page 2 and
install decorative cover by placing the top of the cover into the cover
holder on the top of the backplate and snapping the bottom into
place as shown in Figure 4. Tighten security screw with a screwdriver.
Network Room
Pressure Transmitter
RPC Series - Installation Instructions
Figure 1
Figure 4Figure 3
Figure 2
Cover PCB Backplate

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SETUP
The device parameters must be set before connection to the network and will ensure each device will have
a unique MAC address and Device Instance for startup. On startup, the MAC address is appended to the
Device Object : Vendor Identier to create the unique Device Instance (Device Object : Object Identier).
Once connected to a network, the Device Object : Object Identier can be written to any unique value via
BACnet and then the MAC address will no longer be appended to the value. Once set, all parameters are
saved in non-volatile memory. The local menu and LCD are used to set the BACnet MAC device address (0-
127) and the baud rate. The factory defaults are address 3 and 9600 baud. The menu and setup procedure is
described later.
WIRING
The transmitter has standard screw block connectors. Use shielded twisted pair wiring of at least 22 AWG for
all connections and do not run device wires in the same conduit with wiring used to supply inductive loads
such as motors. Disconnect the power supply before making any connections to prevent electrical shock or
equipment damage. Make all connections in accordance with national and local electrical codes.
This is a 3-wire sourcing device. Connect the positive dc or the ac voltage hot side (24 Vac/dc ± 10%) to the
POWER terminal. The supply common is connected to the COMMON terminal. The device is reverse voltage
protected and will not operate if connected backwards. Use caution if 24 Vac
power is used and one side of the transformer is earth-grounded. In general,
the transformer should NOT be connected to earth ground when using
devices with RS-485 network connections.
Connect the RS-485 network with twisted shielded pair to the terminals
marked A(-), B(+) and SHIELD. The positive wire connects to B(+) and the
negative wire connects to A(-) and the cable shield must be connected to the
SHIELD terminal on each device. If the device is installed at either end of an
RS-485 network, an end-of-line (EOL) termination resistor (121 ohm) should
be installed in parallel to the A(-) and B(+) terminals. This device includes a
network termination jumper and will connect the 121 ohm resistor correctly
on the PCB. Simply move the jumper to the EOL position and no external
resistor is required. The ground wire of the shielded pair should be connected
to earth ground at the end of the network and the device is not grounded.
Do not run bus wiring in the same conduit
as line voltage wiring or other wiring that
switches power to highly inductive loads
such as contactors, coils or motors.
A network segment is a single shielded wire loop run between several devices (nodes) in a daisy chain
conguration. The total segment length should be less than 4000 feet (1220 meters) and the maximum
number of nodes on one segment is 127. Nodes are any device connected to the loop and include controllers,
repeaters and sensors such as the RP but do not include the EOL terminators.To install more than 127 devices,
or to increase the network length, repeaters will be required for proper communication. The maximum
daisy chain length (segment) depends on transmission speed (baud rate), wire size and number of nodes.
If communication is slow or unreliable, it may be necessary to wire two daisy chains to the controller with a
repeater for each segment.
Figure 5
Figure 6
Digital Input
RELAY
Controller
Building Controller
24 Vac/dc
Common
BACnet® Master
A (-)
B (+)
Shield
Device 01
POWER
COMMON
A (-)
B(+)
SHLD
POWER
COMMON
A (-)
B(+)
SHLD
A (-)
B(+)
SHLD
POWER
COMMON
Device 02 Device 03
Set EOL Jumper
Connect Shield
One End Only
EOL EOL
ON OFF
Figure 8
Buzzer +
Buzzer -

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The RELAY output is a normally open dry contact. This signal can be used to directly control an alarm,
ventilation fan or may be connected to a digital input of the BAS for status monitoring. Ensure any load
connected to the relay is within the relay rating in the Specication section.
The remote buzzer is an optional component that can be installed to give a remote indication of an alarm
condition. The BUZZER output requires two wires (+ and -) to operate the 24 Vdc remote buzzer. Follow the
polarity indications on both units when making the connections.
PNEUMATIC CONNECTIONS
The two pressure ports are labeled High Port and Low Port on the PCB.The output signal reads a positive value
when the port pressure is higher on the High port than the Low port, so ensure these ports are connected
correctly. One port will be left open to measure the room pressure where the device is installed and the other
port is connected to a remote pickup outside the room to measure the dierential pressure.
Use 1/16" ID exible silicone tubing for the pressure connections. Tube size adapters are included to allow
the use of 1/8" ID tubing. Arrange the tubing to minimize stress on the connections and ensure there are
no kinks in the tubing. The tubing should be routed through the PCB access hole and out the back of the
enclosure base.
Ensure the tubing to be used is clean and do not allow material to fall into the pressure ports, as contamination
could damage the sensor. When removing tubing use care to avoid breaking the ports. In some cases it is
better to cut the tubing o rather than pull it o, be careful not to cut the tting or an air leak may occur.
POWER UP INSTRUCTION
Before turning on the power, verify all wiring to ensure that it complies with the wiring instructions
described above and verify that the output signal type is correctly selected on the PCB. Also, review the
specications to ensure the power supply is correct and that the pressure is within the correct range. The
product should be allowed to warm-up for several minutes before attempting to verify accuracy.
Operation can be veried by measuring the output signal. For voltage output conguration, measure
the voltage between the PRES OUT and COMMON terminals. The voltmeter should read between 0-5 or
0-10 Vdc depending on the output range selected. For current output conguration, insert a mA meter in
series with the PRES OUT terminal and it should read between 4 and 20 mA.
Upon applying power to the device the alarm condition is set to o so the relay, buzzer, LED and remote
alarm are o. The analog output is set to the midpoint and the LCD will display the software version
number such as 1.00 for 5 seconds. All keys are disabled during start-up mode. At the end of the start-up
mode the device will enter normal operation.
NORMAL OPERATION
For a bipolar range such as ±1"wc, the pressure applied to the High port should be higher than pressure
applied to the Low port for a positive output response. In this case, dierential pressure can be measured
using both ports. If the High port has a positive pressure with respect to the Low port, then the output
indicates a positive pressure. Negative pressure is indicated if the High pressure is less than the Low
pressure. The output pressure can be calculated as follows:
4-20 mA Pressure = [(Output current – 4 mA) / 16 mA] x 2 x Range – Oset
0-5 Vdc Pressure = (Output voltage / 5 V) x 2 x Range – Oset
0-10 Vdc Pressure = (Output voltage / 10 V) x 2 Range – Oset
In the case of ±1"wc, 4 mA or 0 V = -1"wc and 20 mA or 5 V or 10 V = +1"wc. Since the transmitter is linear,
0"wc would be 12 mA or 2.5 V or 5 V.
During normal operation the device reads the pressure sensor and calculates the pressure value
depending on the device model ranges and the selected pressure range. The pressure value is displayed
on the LCD and sent to the analog output.
The output signal may be aected by the pressure averaging time setting in the menu. The pressure

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averaging setting controls how many readings are averaged to form the output value. The pressure
averaging time defaults to 5 seconds and can be set from 1 to 60 seconds. The value eectively lters the
output to prevent noise and false alarms.
The device also compares the output pressure value to the alarm set-points and takes appropriate
action. If the pressure value exceeds either set-point then an alarm condition is set and the device will
operate in alarm mode. Alarm mode activation is controlled by certain delay times and user settings
described later. The device also monitors the keys and takes appropriate action if a key is pressed.
ALARM OPERATION
The alarm feature includes an on-board buzzer, silence switch, control relay, remote buzzer connection
and LED.
The alarm feature has several settings that can be controlled by the setup menu. The device has two
alarm trip points designated the high pressure alarm limit and the low pressure alarm limit. The high
pressure alarm defaults to 50% of the maximum pressure range and the low pressure alarm defaults to
50% of the minimum pressure range. For example, if the device is set to a ±1"wc range, then the default
low pressure alarm limit will be -0.5 "wc and the default high pressure alarm limit will be +0.5 "wc. This is
the same result for Pa ranges.
The alarm set-points can be set over the pressure range with certain conditions. For this example the
pressure range is ±1"wc.
• the low pressure alarm limit cannot go below the minimum pressure range setting (-1.0"wc)
• the high pressure alarm limit cannot go above the maximum pressure range setting (+1.0"wc)
• the high pressure alarm limit must always be greater than the low pressure alarm limit
• the minimum alarm span (high alarm - low alarm) must be at least 25 % of the pressure span (2"wc x
25 % = 0.5"wc)
• if the minimum span is reached while adjusting one of the alarm limits, then the other alarm limit will
be "pushed".
In this example for the ±1"wc range, these are some possible alarm settings: -1.0 to 0.5"wc, -0.75 to
-0/25"wc, -0/5 to 0"wc, -0.25 to 0.25"wc, 0 to 0.5"wc, 0.5 to 1.0"wc.
The alarm also has settings for on delay and o delay which can be set via the menu. Both of these
default to 5 seconds but may be changed from 1 to 59 seconds or 1 to 10 minutes. For an alarm
condition to be set the pressure value must exceed either alarm trip point for more than the alarm on
delay time. For an alarm condition to be reset the pressure value must return to a non-alarm value for
more than the alarm o delay time.
When an alarm condition is set the red LED with ash, the relay output will activate, the local buzzer will
sound and the remote buzzer output will activate. If the alarm condition is reset, all four outputs will
deactivate. The LED ashes at a rate of 1 second on / 1 second o, the relay and remote buzzer are held
on and the local buzzer sounds at a rate of 1 second on / 5 seconds o.
The alarm can be silenced by pressing the front cover silence switch during an alarm condition. In this
case the buzzers and relay will de-activate but the LED continues to ash until the alarm condition is
removed. The alarm silence time can be set in the menu or via BACnet® to 1-60 minutes or forever, and
the default is 30 minutes. This means that if the silence switch is pressed and the alarms are silenced (and
the alarm condition is not reset) then the alarm will re-activate after the silence time has expired. For the
default setting of 30 minutes, the alarm buzzers and relay will activate again after 30 minutes of silence
if the alarm condition still exists. If the delay is set to forever, then the alarms will not activate again in
silence mode until the alarm condition is cleared and another alarm condition is set.
The alarm can be disabled by the user by holding the front cover silence switch for 5 seconds. It can be
re-enabled by holding the switch again for 5 seconds. When the alarm is disabled, the OFF icon will be lit
on the LCD and no alarms will be activated.

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The pressure scale defaults to "wc. Use <UP> or <DOWN> to toggle it to Pa.
<MENU> Press to advance to next menu item
The pressure range defaults to HI. Pressure ranges per model are shown below:
RP01 = HI (±1"wc or ±250 Pa), LO (±0.5"wc or ±125 Pa)
RP02 = HI (±0.25"wc or ±60 Pa), LO (±0.125"wc or ±30 Pa)
This can be changed to LO using <UP> or <DOWN>.
<MENU> Press to advance to next menu item
1. PRESSURE SCALE
2. PRESSURE RANGE
<MENU> Press and release to enter the Setup Menu.
"WC
MENU
The pressure averaging time defaults to 5 seconds. This can be changed from
1-60 seconds using <UP> or <DOWN>.
<MENU> Press to advance to next menu item
3. PRESSURE AVERAGING
"WC
MENU
MENU
The local alarm buzzer volume can be set or muted via the menu and an alarm test can be initiated via
the menu. The alarm test will force an alarm condition to be set. Since the menu has a 5 minute time-out,
if the alarm is left on it will reset after 5 minutes back to a normal condition.
AUTO ZERO OPERATION
A sensor auto zero can be initiated by pressing and holding the internal ZERO switch for at least 3
seconds. If booth pressure ports are close to zero pressure (open to ambient), then the device will
calibrate with a new zero point.
SETUP MENU OPERATION
The setup menu can be accessed by pressing the internal <MENU> key at any time after the start-up
mode.
The system suspends operation when in the menu and holds the last pressure value on the output. If an
alarm condition was present then it will be reset to enter the menu and alarm operation is disabled while
in the menu (except for alarm test). If the setup menu is not active for 5 minutes (no key press), then the
menu will exit and the device returns to normal operation.
The high pressure alarm limit defaults to (+ range max x 50%). This equals
+ 0.5 "wc for the ± 1 "wc range, + 125 for the ± 250 Pa range, etc. It can be
changed using <UP> or <DOWN> throughout the range. Resolution for each
range is: ± 1 "wc (0.05), ± 0.5 "wc (0.02), ± 0.25 "wc (0.01), ± 0.125 "wc (0.01),
± 250 Pa (10), ± 125 Pa (5), ± 60 Pa (2) and ± 30 Pa (1). Note that the ± 250 Pa
range must be displayed as /10 such that it is - 25H to 25H.
<MENU> Press to advance to next menu item
4. HIGH PRESSURE ALARM
MENU
The low pressure alarm limit defaults to (- range max x 50%). This equals - 0.5
for the ± 1 "wc range, - 125 for the ± 250 Pa range, etc. It can be changed using
<UP> or <DOWN> throughout the range. Note the restrictions as described in
Alarm Operation section.
<MENU> Press to advance to next menu item
5. LOW PRESSURE ALARM
MENU "WC
"WC

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The alarm silence time defaults to 30' (minutes). It can be changed from 1-60'
(minutes) or F for forever using <UP> or <DOWN>.
<MENU> Press to advance to next menu item
8. ALARM SILENCE TIME
MENU
The buzzer volume defaults to 2 (high volume). It can be changed to 0 (o) or
1 (low volume) using <UP> or <DOWN>.
<MENU> Press to advance to next menu item
9. BUZZER VOLUME
MENU
The LCD backlight defaults to 1 (on). It can be toggled to 0 (o) using <UP> or
<DOWN>.
<MENU> Press to advance to next menu item
10. BACKLIGHT
MENU
The LCD backlight defaults to 1 (on). It can be toggled to 0 (o) using <UP> or
<DOWN>.
<MENU> Press to advance to next menu item
11. ALARM TEST
MENU
The alarm o delay defaults to 5" (seconds). It can be changed from 1-59"
(seconds) and 1-10' (minutes) using <UP> or <DOWN>.
<MENU> Press to advance to next menu item
7. ALARM OFF DELAY
MENU
OFF
The default BACnet® MAC address is 3. This can be changed from 0 to 127 using
<UP> and <DOWN>.
<MENU> Press to advance to next menu item
12. MAC ADDRESS
MENU
The default network baud rate is 96 (9600). It can be changed to 192 (19200), 384
(38400) or 768 (76800) using <UP> and <DOWN>.
<MENU> Press to return to normal operation
13. BAUD RATE
MENU
The alarm on delay defaults to 5" (seconds). It can be changed from 1-59"
(seconds) and 1-10' (minutes) using <UP> or <DOWN>.
<MENU> Press to advance to next menu item
6. ALARM ON DELAY
MENU

PRINTED IN CANADA
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SPECIFICATIONS
GENERAL
Sensor Accuracy............................. ±1% FS of selected range (±2% for 0.125"wc and 30 Pa ranges)
Stability ............................................. ±1% FS max (1 year)
Thermal Eect................................. <±3.5% FS max, 5 to 50°C (41 to 122°F)
Response Time ............................... 1 to 60 seconds (menu selectable)
Proof Pressure................................. 100"wc (24.9 kPa)
Burst Pressure ................................. 200"wc (49.8 kPa)
Operating Conditions .................. 0 to 60°C (32 to 140°F), 0 to 90 %RH non-condensing
Storage Temperature ................... -40 to 70°C (-40 to 158°F)
Media Compatibility..................... Dry air or inert gas
Zero Adjust ...................................... Push-button auto-zero
LCD Display...................................... 3½ digit LCD, 0.45" digit height, unit symbols and backlight
Wiring Connections...................... Screw terminal block (14 to 22 AWG)
Pressure Connections .................. Ports for 1/16" ID tubing (1/8" ID adapters included)
Enclosure.......................................... White ABS, IP30 (NEMA 1)
84mm W x 119mm x 29mm H (3.3" x 4.7" x 1.15")
Weight ............................................... 115g (4oz)
Country of Origin........................... Canada
POWER SUPPLY
Power Supply.....................................24 Vac/dc ±10%
Power Consumption ......................70 mA max with alarms on
INTERFACE
Communication............................. 2 wire RS-485, BACnet® MS/TP protocol
Baud Rate ......................................... Locally set to 9600, 19200, 38400, or 76800
MAC Address Range..................... Locally set to 0 to 127 (factory default is 3)
ALARM
Relay ......................................................N.O. contact, 2 Amps @ 120 Vac or 30 Vdc
Trip Point .............................................Upper and Lower alarms adjustable over the pressure range
Delay......................................................0 to 10 minutes (menu selectable)
PRESSURE RANGES
RPC01................................................. ±1"wc, ±0.5"wc, ±250 Pa, ±125 Pa
RPC02................................................. ±0.25"wc, ±0.125"wc, ±60 Pa, ±30 Pa
DIMENSIONS
84 mm
3.3“
119 mm
4.7“
29 mm
1.15 “
82.6 mm
3.25 “
58 mm
2.3 “