CSI MR-AHU Assembly instructions

MR-AHU Installation Sheet
Installation Sheet (TCON154 11/97) 1
Controller Installation
1. Check the mounting location for the MR-AHU. The
available area must measure at least 4.3" × 8" (11.0 × 20.3
cm) and should be in a moisture free container away from
anylarge electrical devices. The screw holes are 3.75" × 7.5"
(9.5 × 19.1 cm) as shown in Figure1, “MR-AHU
(Covered)”, and will require phillips or slotted pan head
screws.
2. You will not need to remove the plastic cover to install the
MR-AHU, or any of the connections. To replace the 4A FB
fuse, remove the plastic cover, remove the old fuse and
install a new fuse (see Figure2, “MR-AHU (Cover
Removed)”).
Connecting the Input Devices
Warning: Ensure that no power is connected to the MR-AHU
during electrical installation. Failure to disconnect
power from all interconnected equipment when
performing electrical installation may result in damage
to the components and/or electrical shock or burns
1. Connect the external input devices (contact or thermistor)
leads to an input terminal, TB4 – 1 through TB4 – 4 (Input
1 to Input 4, see Figure3, “Input Device Connections”).
2. Connect the other input device lead (common return lead)
to the signal ground terminal, TB4 – 6 (Ground).
.
Figure 1. MR-AHU (Covered) Figure 2. MR-AHU (Cover Removed)
GROUND
OUTPUT 6
OUTPUT 5
OUTPUT 4
OUTPUT 2
OUTPUT 3
OUTPUT 1
TRIAC OUTPUTS
24VAC. 0.5A EACH. 2.0A TOTAL
123456
TB4
INPUTS
GROUND
+12V
INPUT 4
INPUT 3
INPUT 2
INPUT 1
INPUT PORT
TEST
D1 U1
TB5
OUTPUTS
S1
1234567
SENSOR
LAN
P1
TB1 TB2
AC PWR
TB3
12 123
12
LAN +
LAN –
24V ~
GROUND
SIGNAL
POWER
GROUND
PWR LAN
PORT I/STAT
PORT
ADDRESS-01
ADDRESS-02
ADDRESS-03
ADDRESS-04
ADDRESS-05
FUNCTION-06
FUNCTION-07
FUNCTION-08
FUNCTION-09
FUNCTION-10
FUNCTION-11
FUNCTION-12
SWITCHES
OUTPUT 1
TEST
OUTPUT 2
OUTPUT 3
OUTPUT 4
OUTPUT 6
OUTPUT 5
TRANSMIT
RECEIVE
STATUS DISPLAY
Micro-Regulator
ULLISTED
ENERGY MANAGEMENT
EQUIPMENT
POWERED BY A SINGLE
CLASS 2 SOURCE
MODEL:
SERIAL NO.:
POWER:
24V – 7VA
(55VA MAX)
MADE IN USA
BY:
CONTROL SYSTEMS
INTERNATIONAL
P.O. BOX 59469
DALLAS, TX
75229
MR-AHU
8.00 "
7.50 "
4.30 "
3.75 "
DIN Rail
Mounting
Clips
Test
D1
1
2
3
4
5
6
7
8
TX
RX
U1
TB5
OUTPUTS
S1
1234567
123456
TB4
INPUTS
330815–
SENSOR
LAN
P1
TB1 TB2
AC PWR
FS1
TB3
12 12 123
COPYRIGHT 1995 CSI, INC
MADE IN USA
Inputs
24 VAC Power Input
Sub-LAN Port
I/STAT Port
Address/Function
Select Dip Switches
LED Communications
Indicators
Control Outputs
4 A FB
Replaceable Fuse
Figure 3. Input Device Connections
123456
TB4
INPUTS
10K ohm Thermistor
GROUND
+12V
INPUT 4
INPUT 3
INPUT 2
INPUT 1
INPUT PORT
123456
TB4
INPUTS
10K ohm Thermistor
GROUND
+12V
INPUT 4
INPUT 3
INPUT 2
INPUT 1
INPUT PORT
Mixed Air
Temperature
Sensor
S/P/L Contact
MR-AHU with Binary Load
AHU_2100 and Earlier: MR-AHU with Binary Load AHU_2200 and Later:

MR-AHU
2 Installation Sheet (TCON154 11/97)
I/STAT, S/STAT and W/STAT Connections
1. Connect the I/STAT, S/STAT, or W/STAT white, red, and
black conductors to TB3 – 1 through TB3 – 3 (Signal, Power,
and Ground) as shown in Figure4, “I/STAT and S/STAT
Connection”.
2. When connecting an S/STAT connect the blue and yellow
conductors to TB4 – 4 (Input 4). Refer to Table 2, “DIP
Switch Configuration Settings”.
Connecting the Sub-LAN
1. Connect the + lead of the twisted pair sub-LAN cable to
terminal TB2 – 1 (LAN+, see Figure5, “Sub-LAN
Connections”).
2. Connect the – lead of the twisted pair sub-LAN cable to
terminal TB2 – 2 (LAN –).
3. Shield drain wire continuity must be maintained as the sub-
LAN cable passes through each MR-AHU. Shield drain
wires from each controller sub-LAN cable must be twisted
together, insulated, and tied back such that wires do not
come in contact with ground or any conductive surface.
4. Connect the shield drain wire directly to Electrical Service
Earth Ground at only one end of the cable (e.g., at the MCI,
MRI, or at one MR-AHU).
Note: Refer to “Cable Requirements” in “Specifications” on
page 4.
Figure 4. I/STAT and S/STAT Connection
123456
TB4
INPUTS
SENSOR
TB3
GROUND
+12V
INPUT 4
INPUT 3
INPUT 2
INPUT 1
INPUT PORT
123
SIGNAL
POWER
GROUND
I/STAT
PORT
White
Red
Black
Blue
Yellow
S/STAT Only
I/STAT, W/STAT and S/STAT
Figure 5. Sub-LAN Connections
LAN
P1
TB1
TB2
AC PWR
12
12
LAN +
LAN
PORT
LAN –
24V ~
GROUND
PWR

MR-AHU
Installation Sheet (TCON154 11/97) 3
Connecting the Output Devices
1. Connect one lead of the control relays to TB5 – 1 through
TB5 – 6 (Output 1 through Output 6) as shown in Figure6,
“Output Device Connections”.
2. Connect the other lead of the control relays to earth ground
as shown.
Note: You must establish a proper earth ground connection
point prior to connecting wires to electrical equip-
ment.
• Electrical Service Earth Ground wire must be
securely connected to the equipment chassis.
• The 24 VAC transformer secondary lead must be
securely connected to the Electrical Service Earth
Ground wire.
• The Electrical Service Earth Ground wire must be
connected to the ground terminal on the
controller power input terminal block, TB1 – 2
(Ground).
Connecting the Power Supply
1. Connect the 24 VAC input lead from a separate, isolated 24
VAC transformer to TB1 – 1 (24 VAC, see Figure7, “Power
Connections”).
2. Connect TB1 – 2 (Ground) to earth ground using 14-AWG
wire (2.1 mm
2
). TB1 – 2 connects to the same earth ground
connection as the neutral lead from the transformer.
Note: Connecting TB1 – 2 to a chassis bonding post sepa-
rated by seams, welds, or fasteners in the metal
chassis could produce continuity ground faults.
Caution: Applying 24 VAC power to any connectot other than
TB1 will cause component damage to the MR-AHU
circuit board.
Switch Settings
The DIP switch settings define the sub-LAN address and basic
configuration of the unit. Define the sub-LAN address using
switches 1 – 5 to set an address ranging from 0 to 31. The value
is the accumulated value of switches 1 – 5 when set to the ON
position (refer to Table 1). The ON position of the switch is away
from the “Open” label on the switch base. The operational
configuration can be initially set using the DIP switch settings in
Table 2. For information concerning specific application
configurations refer to TCON153, Application Specific Controller,
MR-AHU Installation Guide .
Figure 6. Output Device Connections
GROUND
OUTPUT 6
OUTPUT 5
OUTPUT 4
OUTPUT 2
OUTPUT 3
OUTPUT 1
Aux/Fan/Heat
Relay or actuator loads
24 VAC @ 0.5 A each, 2.0 A maximum Total
TB5
Earth
Ground
1234567
Damper
H2
H1
Fan
C1
C2/H3 or C2 (See Note)
24VAC 0.5A EACH 20A TOTAL
TRIAC OUTPUTS
Note: MR-AHUs with binary load
AHU_2200 and later do not
support a third stage of heating.
Figure 7. Power Connections
LAN
P1
TB1
TB2
AC PWR
12
12
LAN +
LAN
PORT
LAN –
24V
GROUND
PWR
Earth
Ground
Line Voltage 24 VAC
24 VAC Transformer

MR-AHU
4 Installation Sheet (TCON154 11/97)
Specifications
Table Notes:
1. MR-AHUs with binary load AHU_2100 and earlier support up to 3 stages of heating. MR-AHUs with binary load AHU_2200 and
later support up to 2 stages of heating.
Dimensions
MR-AHU: 8"L × 4.3"W × 2.5"H
(20.3 × 10.9 × 6.4 cm)
Operating Environment
Temperature: 32 ° to 122 ° F (0 ° to 50 ° C)
Humidity: 10 to 90% RH, non-condensing
Input power: 24 VAC ± 10%, 50/50 Hz @ 8VA plus Triac
Output Load, 4 A fused (with I/STAT)
24 VAC @ 7 VA plus Triac Output Load, 4 A
fused (without I/STAT)
Cable Requirements
MR LAN
Maximum Length: 5,000 ft. (1,500 m)
22 AWG (0.324 mm
2
) shielded, twisted pair
(Belden 9184 equivalent) 5,000 feet (1,500 m)
maximum
or
24 AWG (0.206 mm
2
) shielded, twisted
pair (Belden 9841 equivalent) 4,000 feet (1,200 m).
30 pF/ft. or less between conductors, 55 pF/ft. or
less conductor to shield, 85 to 150 ohm impedance.
Belden 9841 or equivalent.
Inputs/Outputs
Inputs: Digital — Dry Contact, excitation 5 V at 0.5 mA
Analog — 10K Ohm NTC Thermistor, Dale
1M1002-C3 (Reference CSI TTS100 specification)
Accuracy: 1%
Resolution: 0.4% Span
Span: 25 ° to 113 ° F (–4 ° to 45 ° C)
Outputs: Low voltage Triac — 24 VAC @ 0.5 A maximum
each output (2.0 A maximum total), voltage
sourcing
MicroRegulator Interface
7792 MRI
7793 MCI
7798 I/SITE LAN
Agency Approvals
FCC Part 15
UL916 Energy Management Equipment Pending
UL94-V0 Rated Enclosure
Table 1. MR-AHU LAN Address
Switch Number 12345
Switch Value (Switch On) 124816
Table 2. DIP Switch Configuration Settings
Primary Heat Auxiliary Heating Stages FanType S/STAT Fan Is OnWtih Heat
SW 6 SW7 SW8 SW9 SW10 SW11 SW12
None Off Off None Off Off On On Yes On No Off
1 Cooling Stage On Off 1 Heat Stage On Off Auto Off No Off Yes On
2 Cooling Stages Off On 2 Heat Stages Off On
2 or 3 Heat
Stages
(See Note 1) On On