Installation - Siemens RDY2000BN Installation Instructions Manual

Document No. 125-1009
Installation Instructions
February 10, 2020

Installation

Refer to Energy Management System Network Plan
for MS/TP installation and configuration parameters.
1. Verify power to HVAC equipment is turned off.
2. Optional: To replace an existing thermostat:
a. Remove the existing thermostat.
b. Record wiring connections to existing
thermostat base plate terminals.
c. Remove the existing base plate.
3. Install the new thermostat base plate.
a. Feed all installed wires through the opening
in base plate and strip to 3/16-inch (5 mm).
b. Secure the base plate to the mounting
surface using supplied hardware.
NOTE:
Ensure that the UP arrows embossed on the
base plate are pointed upward.
Figure 2. Thermostat Base Plate.
4. Attach the HVAC system wires to appropriate
terminals on the thermostat base plate Figure 2.
a. Verify HVAC equipment schematics for
required circuit connections to thermostat
Wiring Diagrams, Figure 4 and Figure 5.
b. Verify each 24 Vac transformer secondary
neutral is connected to HVAC ground.
c. If a single transformer is used, leave the
Jumper RH-RC in place. Connect 24 Vac to
RC terminal, and neutral to terminal C.
d. If separate transformers are used for
heating and cooling systems, remove the
Jumper RH-RC. Connect cooling 24 Vac to
terminal RC, neutral to terminal C and
heating 24 Vac to terminal RH.
e. Connect control wires to terminals Y1, Y2,
O/B, G, W1, W2, OUT1, OUT2, or OUT3.
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f. Connect Sensor wires to terminals IN1,
IN2, IN3, or IN4 and adjacent INC common.
Optional: Auxiliary Output 3 can be changed to
a dry (unpowered) contact by removing Jumper
RC-C3 and connecting dry contact wires to
OUT3 and C3. See Wiring Diagrams, Figure 6.
Optional: If using Configurable Inputs 1 to 4 or
Auxiliary Outputs 1 to 3, use setup parameters
P301 to P320 to set functionality.
5. Attach MS/TP wire to NET terminals on left of
the thermostat base plate Figure 2.
CAUTION:
To ensure signal integrity observe MS/TP
network wire polarity, reference terminator
and shield earth grounded at one location,
two end of line terminators, and if required
an external network bias device.
MS/TP devices from some vendors may
refer to input A as (-) and input B as (+) or
may require external network bias.
For RDY2000BN, NETA is non-inverting
input A (+) internally biased high, NETB is
inverting input B (-) internally biased low to
REF (↓), and external bias is not required.
a. Refer to the network plan for MS/TP wire
color code used for (+), (-), and (↓).
b. See Figure 7 for wiring thermostat at the
middle of line (two MS/TP cables) or at the
end of line (one MS/TP cable).
c. If thermostat at the middle of line, connect
terminals to two MS/TP cables with (+) to
NETA, (-) to NETB, and (↓) to REF.
Connect shield wires together and insulate.
d. If thermostat at the end of line, connect
terminals to one MS/TP cable and one end
of line terminator with (+) and terminator to
NETA, (-) and terminator to NETB, and (↓)
to REF. Verify shield is connected to earth
ground and insulate.
6. Attach thermostat to base plate by engaging
tabs at the top and rotating the thermostat
downward until securely seated on base plate.
7. Secure the thermostat to the base plate with the
Phillips screws (provided), using the holes at
the bottom of the housing.
8. Remove thermostat LCD screen cover.
nd
9. Optional: store 2
Label with the BACnet Energy Management
System commissioning documents.
BACnet Serial Number
Siemens Industry, Inc.