Terminal Unit Relay Board (TURB)

Terminal Unit Relay Board (TURB)
Terminal Unit Relay Board (TURB)
Installation and Operating Instructions
________________________________________________________________________________________________________________________________________________________________
16524_ins_turb
Rev03/142008
Overview
Today s energy costs are forcing older buildings to be retrofitted with Building Management Systems - keeping the
occupied spaces comfortable while reducing the overall energy use. The TURB - Terminal Unit Relay Board is an
interface board that allows convenient interconnection between a Digital Controller and a unitary unit s conventional
thermostat terminal block. The TURB eliminates the wiring mess and provides a neat professional look that simplifies
maintenance to eliminate costly callbacks.
The TURB provides an easily pluggable interface between the modules and provides fused power to the controller from
the R terminal of the unitary unit. Dry-contact pilot duty relays interface between the Digital Controller and the
conventional thermostat inputs of the DX unit.
The TURB also provides a mini communications block with surge protection to provide a clean and easily pluggable
connection to the controller. All this is packaged on a board that mounts in a 2.75" snaptrack in one orientation, or a 3.25"
snaptrack in the other orientation, depending on how you want to install the module.
For your convenience, BAPI offers the TURB with an optional 4" piece of 2.75" snaptrack, BA/TURB-TRK
NOTE: This unit uses a common supply (the R pin of the TSTAT terminal block J6) for the first and second stage
compressors. For isolated supplies for first and second stage compressors, contact BAPI.
Fig 1: BA/TURB
Tool & Material List
#2 Phillips Scewdriver, 1/8 Screwdriver (BA/116W), Wire Stripper, Drill, DVM, Mounting Screws, Wire
Specifications
Relay Input Power: 24VAC @ 10mA each
Relay Output Contacts: 2 Amps @ 24VAC, 24VDC
Communications Clamping Voltage: 7.5 V positive, 1 V negative
Specifications subject to change without notice.
___________________________________________________________________________________________________________________________________________________________________________________
Building Automation Products Inc., 750 North Royal Avenue, Gays Mills WI 54631 USA
Tel. +1-608-735-4800 Fax +1-608-735-4804 E-mail:sales@bapihvac.com Web:www.bapihvac.com
Page 1 of 3
Terminal Unit Relay Board (TURB)
Installation and Operating Instructions
________________________________________________________________________________________________________________________________________________________________
16524_ins_turb
Rev03/142008
Mounting
The BAPI BA/TURB mounts in a piece of snap track as shown in
Figure 2. On each end of the snaptrack is a crescent shaped
mounting hole (see Figure 1). Place the snaptrack against its
mounting surface and mark the two crescent shaped holes. Drill
the holes for a #8 or #10 screw (provided by the user). Insert a
screw into one hole and drive it down about 1/2 way. Slide the
snaptrack under the screw head and drive in the opposite screw.
Tighten both screws securely.
Fig 2: BA/TURB shown in horizontal mount
(can be mounted 90 degrees if desired)
Termination
The wiring connections are shown in Figure 3 (on page 3) and in the following tables:
Table 2: Connections from TURB to the Unitary Unit s Conventional
Thermostat Terminal Block
Table 1: Connections from DDC Controller
to the BA/TURB
FAN AC
FAN AC
TURB Connection
(J5)
FAN ON
FAN ON
R2
Not Connected. Contact BAPI for Isolated
st
nd
power for 1 and 2 compressors.
DDC Controller
TURB Connection (J6)
DX1
DX1
COM
COM
DX2
DX2
Heat1
HEAT1
24 VAC
24 VAC
Heat2
HEAT2
R
Red - 24 VAC Thermostat Power
G
Green - Fan Control Terminal
Y1
Yellow1 - Stage 1 Cooling terminal
Y2
Yellow2 - Stage 2 Cooling terminal
W1
White 1 - Stage 1 Heating Terminal
W2
White 2 - Stage 2 Heating Terminal
REV VALVE
Reversing Valve
Table 3: Surge Protected Communications Connections
Signal for Communications
Connectors (J1, J2, & J3)
Signal Description
+
Communications + signal wire
-
Communications - signal wire
SG
Shield (PG)
Unitary Unit s Conventional Thermostat
Terminal Block
Communications signal common
ground
Communications cable shield
Protected Ground (PG)
Table 4: Power Connections on TURB (J4)
PCB Label
Description
24 VAC IN
If J10 is cut, then 24 VAC IN.
Else Not Connected
COM IN
Common return for 24 VAC IN
Equipment GND
Equipment Ground (Earth)
24 VAC OUT
24 VAC OUT to controller
COM OUT
Common return for the
controller
Equipment GND
Equipment Ground for controller
Specifications subject to change without notice.
___________________________________________________________________________________________________________________________________________________________________________________
Building Automation Products Inc., 750 North Royal Avenue, Gays Mills WI 54631 USA
Tel. +1-608-735-4800 Fax +1-608-735-4804 E-mail:sales@bapihvac.com Web:www.bapihvac.com
Page 2 of 3
Terminal Unit Relay Board (TURB)
Installation and Operating Instructions
________________________________________________________________________________________________________________________________________________________________
16524_ins_turb
Rev03/142008
Termination Continued
NOTE: The BA/TURB connectors use a rising block screw terminal to
hold the wires. It is possible for the block to be in a partially up
position allowing the wire to be inserted under the block. Be sure that
the connector screws are turned fully counterclockwise before
inserting the wire. Lightly tug on each wire after tightening to verify
proper termination.
Digital
Outputs
Figure 3: Generic TURB Connections
Note: Figure 3 is for DDC digital outputs that switch the 24 VAC supply. For DDC controllers with output that switch
ground, contact BAPI.
Specifications subject to change without notice.
___________________________________________________________________________________________________________________________________________________________________________________
Building Automation Products Inc., 750 North Royal Avenue, Gays Mills WI 54631 USA
Tel. +1-608-735-4800 Fax +1-608-735-4804 E-mail:sales@bapihvac.com Web:www.bapihvac.com
Page 3 of 3
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