Johnson Controls MRC Series Installation Guide

Installation Instructions MRC

Modular Room Control (MRC) Series

Digital Thermostat

Issue Date August 14, 2002

Application

The MRC Digital Thermostat is an expandable multi-purpose, high-quality Direct Digital Control (DDC) illuminated thermostat designed to control virtually any Fan Coil Unit (FCU) or Packaged Terminal Air Conditioning (PTAC) found in hotel guestrooms. The MRC comes standard with five relays and can be equipped with an on-board Infrared (IR) transceiver and Passive Infrared (PIR) motion detector. Coupled with a magnetic door switch (wired or wireless), the MRC becomes the brain of a highly effective Energy Management System (EMS) for guestrooms.

When connected to the Central Interface Network (CINET) with a pair of low voltage wires, a centrally controlled EMS package is created. The MRC is readily expandable to include functionality such as humidity control, outside temperature display, mini-bar access reporting, occupancy reporting to housekeeping, automatic control of lights, and much more. Use of infrared or low-voltage wiring enables remote control of lights, occupancy reporting, and other functions.

Installation

Locate the MRC thermostat as follows:

Mounting

The MRC is designed to be mounted on a standard double-gang (4 x 4) junction box. If it is necessary to mount the MRC on a single-gang box, the left side (display side) of the MRC overlaps the wall area to the left of the junction box.

To mount the MRC mounting plate:

1. Remove the two small screws at the base of the MRC.

2. Pull the bottom of the back-mounting plate slightly away from the front housing and then pull the back-mounting plate down.

IMPORTANT: If the back-mounting plate is rotated more than 2 or 3°, the plastic tabs at the top of the plate may fracture or break off.

3. Attach the mounting plate to the junction box, using the mounting screws provided with the MRC. Ensure that the plate is mounted with the raised arrow pointing UP (↑).

Wiring

• on a partitioning interior wall, and approximately

1.5 m (5 ft) above the floor in a location of average temperature

• away from direct sunlight or radiant heat, outside

walls or behind doors, air discharge grills, stairwells, or outside doors

• away from steam or water pipes, warm air stacks,

unheated/uncooled areas, or sources of electrical interference

CAUTION: Risk of Shock.

Disconnect the power supply before mounting the thermostat to prevent electrical shock or possible damage to the equipment.

2002 Johnson Controls, Inc.

Part No. 24-9778-6, Rev. – www.johnsoncontrols.com

CAUTION: Risk of Equipment Damage.

Before applying power, make all wiring connections and check the connections. Short-circuited or improperly connected wires may result in permanent damage to the unit.

IMPORTANT: Make all wiring connections in accordance with the National Electrical Code (NEC) and all local regulations.

To simplify installing and removing the MRC, a standard Molex® 10-position or 8-position connector is used. The female receptacle is on the back of the MRC vertically centered over the high-voltage section (see Figure 1).

Molex

Receptacle

Figure 1: Molex Receptacle Location

The MRC is supplied with a Molex connector prewired with eight or ten 8 in. (203 mm) color-coded leads. These leads are connected in the wall junction box to the wiring from the FCU or other Heating, Ventilating, and Air Conditioning (HVAC) device with wire nuts (see Figure 2).

Note: For installations in which all 10 leads are not required, the extraneous leads should be cut off at the Molex connector.

Figure 4 shows the 8-position Molex connector. It is used with the 24 V TRIAC model MRC and comes with 8-in. wire leads. The end view of the male connector from the wire insertion side with the pin numbers is indicated. This is the same as looking at the female connector point on the backside of the MRC.

12 34

8.7

220

Figure 4: 8-Pin Molex Connector Wire Lead,

in. (mm)

IMPORTANT: It is essential that the leads from

the FCU or other HVAC device be properly connected to the male 8-pin or 10-pin connector (see Figure 6 through Figure 10). Following each wiring diagram is a table containing the color legend for the 8-pin or 10-pin female receptacle (H1) at the back of the MRC. Common industry practice for color coding has been used, but there is no guarantee that the same standard has been used for the wires coming from the FCU.

Network Harness

Molex

Connector

Figure 2: Backplate Wiring

Figure 3 shows the 10-position Molex connector with 8 in. (203 mm) wire leads, supplied with all relay output models of the thermostat. The end view of the male connector from the wire insertion side with the pin numbers is indicated. This is the same as looking at the female connector point on the backside of the MRC.

234

8.7

220

To wire the MRC thermostat:

1. Use wire nuts to connect the wiring harness to the FCU wires within the electrical box (see Figure 2).

2. Plug the prewired 8 or 10-pin connector into the female receptacle at the back of the MRC.

3. Hook the tabs at the top rear of the MRC housing into the matching depressions at the top of the mounting plate and rotate the bottom of the housing toward the wall until it snaps into place on the mounting plate (see Figure 5).

4. Secure the housing to the mounting plate with the two small screws removed in Step 1 of the Mounting section.

Figure 3: 10-Pin Molex Connector Wire Lead,

in. (mm)

Figure 5: Returning the MRC to the Mounting Plate

2 Modular Room Control (MRC) Series Digital Thermostat Installation Instructions

Phase

Transformer

Neutral

Heat Valve

Cool Valve

Heat

Cool

M L

Med

Low

Fan Motor

Relay

Fan Coil Unit

Pack

Note: In this application, the valves and fan motor operate with the same line voltage. Therefore, grey (valve power) and violet (fan power) wires are connected to the red (control power) wire with a wire nut.

Note: This drawing only reflects connections between the FCU/PTAC and the MRC Stat. It does not include the door switch, Network, or other connections.

24 VAC

MRC

(

)

0 )

1 2 3 4 5

6 7 8 9 10

o w

(

)

6 )

(

)

1098

Logic and Relays

Figure 6: 4-Pipe, 3-Speed Fan FCU with 7 Wires 24 VAC Wiring

Table 1: Pin Number Wire Color and Function

Pin Number Wire Color Function

Green Ground

Red Control Power

Black Neutral

Blue High Fan

Brown Medium Fan

Yellow Cold Water Valve

White Hot Water Valve

Grey Valve Power

Violet Fan Power

Orange Low Fan

Modular Room Control (MRC) Series Digital Thermostat Installation Instructions 3

Phase

Heat Valve

Cool Valve

H M L

Fan Motor

Fan Coil Unit

Note: In this application, the valves and fan motor operate with the same line voltage. Therefore, grey (valve power) and violet (fan power) wires are connected to the black (control power) wire with a wire nut.

Note: This drawing only reflects connections between the FCU/PTAC and the MRC Stat. It does not include the door switch, Network, or other connections.

MRC

GREEN(1)

BLUE(10)

WHITE(3)

1 2 3 4 5

6 7 8 9

ORANGE( 5)

YELLOW(4)

VIOLET (9)

RED(6)

BLACK(2)

BROWN( 7)

GREY(8)

1098

Figure 7: 4-Pipe, 3-Speed Fan FCU with 7 Wires 100 VAC - 277 VAC Wiring

Table 2: Pin Number Wire Color and Function

Pin Number Wire Color Function

Green Ground

Black Control Power

White Neutral

Yellow High Fan

Orange Medium Fan

Red Cold Water Valve

Brown Hot Water Valve

Grey Valve Power

Violet Fan Power

Blue Low Fan

4 Modular Room Control (MRC) Series Digital Thermostat Installation Instructions

Logic and Relays

Phase

Neutral

Heat Valve

Cool Valve

Fan Motor

Fan Coil Unit

ORANGE(5)

GREEN(1)

BLUE(10)

YELLOW (4)

Note: This drawing only reflects connections between the FCU/PTAC and the MRC Stat. It does not include the door switch, Network, or other connections.

MRC

WHITE( 3)

1 2 3 4 5

6 7 8 9

Logic and Relays

Figure 8: 4-Pipe, 2-Speed Fan FCU with 6 Wires 100 VAC - 277 VAC Wiring

Table 3: Pin Number Wire Color and Function

Wire Color Function

Number

Green Ground

Black Control Power

White Neutral

Yellow High Fan

Orange Medium Fan

Red Cold Water Valve

Brown Hot Water Valve

Grey Valve Power

Violet Fan Power

Blue Low Fan

VIOLET(9)

RED(6)

BLACK(2)

GREY(8)

BROWN(7)

1098

Modular Room Control (MRC) Series Digital Thermostat Installation Instructions 5

Phase

Neutral

Fan Coil Unit

Heat Strip

Cool Valve

Fan Motor

Note: In this application, the valves, heat strip, and fan motor operate with the same line voltage. Therefore, grey (valve and heat strip power) and violet (fan power) wires are connected to the black (control power) wire with a wire nut.

Note: This drawing only reflects connections between the FCU/PTAC and the MRC Stat. It does not include the door switch, Network, or other connections.

Relay

MRC

GREEN(1)

WHITE( 3)

BLUE(10)

1 2 3 4 5

6 7 8 9 10

BROWN(7)

ORANGE(5)

GREY(8)

VIOLET(9)

RED(6)

YELLOW(4)

BLACK(2)

109

Figure 9: 2-Pipe, 3-Speed Fan FCU with Heat Strip and 7 Wires 100 VAC - 277 VAC Wiring

Table 4: Pin Number Wire Color and Function

Pin Number Wire Color Function

Green Ground

Black Control Power

White Neutral

Yellow High Fan

Orange Medium Fan

Red Cold Water Valve

Brown Hot Water Valve

Grey Valve Power

Violet Fan Power

Blue Low Fan

6 Modular Room Control (MRC) Series Digital Thermostat Installation Instructions

Logic and Relays

Phase

Neutral

Transformer

Heat Valve

Cool Valve

24 VAC

Fan Coil Unit

H M

Fan Motor

ORANGE(5)

BROWN(7)

BLUE(10)

YELLOW(4)

GREEN(1)

WHITE(3)

VIOLET(9)

RED(6)

BLACK(2)

GREY(8)

Note: In this application, the fan motor operates at line voltage, the control and valves operate at 24 VAC. Therefore, grey (valve power) wire is connected to the black (control power) wire with a wire nut.

Note: This drawing only reflects connections between the FCU/PTAC and the MRC Stat. It does not include the door switch, Network, or other connections.

MRC

1 2 3 4 5

6 7 8 9 10

Logic and Relays

1098

Figure 10: 4-Pipe, 3-Speed Fan FCU with 7 Wires 100 VAC - 277 VAC Fan Wiring, and 24 VAC Control and

Valve Wiring

Table 5: Pin Number Wire Color and Function

Pin Number Wire Color Function

Green Ground

Black Control Power

White Neutral

Yellow High Fan

Orange Medium Fan

Red Cold Water Valve

Brown Hot Water Valve

Grey Valve Power

Violet Fan Power

Blue Low Fan

Modular Room Control (MRC) Series Digital Thermostat Installation Instructions 7

Setup and Adjustments

The MRC coupled with a magnetic door switch (wired or wireless) and a Passive Infrared (PIR) sensor (on-board or separate [wall mount or ceiling mount]) becomes the brain of a highly effective energy management system for guestrooms.

Door Switch - Wired (MRC19-MDS0)

In each room, run a two-conductor, 24-gage [minimum] cable from the thermostat to the doorframe location (see Figure 11) extending through the door header framing leaving a minimum of 5 in. (127 mm) of extra cable. The cable should extend through the center of the framing approximately 5 in. (127 mm ) in from the top (or side) corner of the door.

Run the other end of the cable [along with any other low-voltage cables] to the back of the MRC thermostat. A minimum of 12 in. (305 mm) of extra cable should be left at the thermostat location for termination.

IMPORTANT: New Construction.

At the time of doorframe installation, the cable must be pulled through a pre-drilled hole in the hollow metal door header. This allows for installation of the door switch at a later date. (The door must also be pre-drilled to accept the magnet side of the door switch.)

Note: The MRC19-MDS0 has a lip that protrudes below the frame of the door. The spacing between the door and the frame must be able to accommodate this lip (which is about 0.060 in. [1.5 mm] thick).

The switch and the mating magnet may also be installed horizontally near the top, as shown in the drawing as an alternate location. For installation in a wooden door/frame, the depth of the hole in the frame should be 2 in. (51 mm) and the depth of the hole in the door should be 1 in. (25.4 mm).

Clearance

4 to 6 in.

102 to 152 mm

Alternate

Location

Hole

Diameter

0.75 in. 19 mm

(Door and Frame)

0.10 in. (2.54 mm) Minimum

0.50 in. (12.7 mm) Maximum

Note: If an MRC19-PKG0 DND/MUR external plate is being used, the cable from the MRC19-MDS can be terminated at the location of the MRC19-PKG0. A minimum of 12 in. (305 mm) of extra cable should be left at the MRC19-PKG0 location for connection to the MRC19-PKG0. This method of installation eliminates the need to run the cable directly to the MRC Thermostat. Refer to the Do-Not-Disturb/Make-Up-

Room/Door Chime Kit Installation Instructions (Part No. 24-9778-22) for more detailed installation

and wiring instructions.

The MRC19-MDS0 is a normally open reed magnet switch. Electrically, the contacts are closed when the reed switch is in close proximity to a suitable magnet. Figure 11 defines the recommended mounting method for the switch in a hotel guestroom environment. The location of the contact was selected so that the switch detects a door that is resting against the frame but is not latched. Placing the switch closer to the hinge of the door provides a door closed indication with increasingly open angle.

Figure 11: MRC19-MDS0 Installation

Door Switch - Wireless (MRC19-MDS2)

In each room, run the supplied two-conductor, 24-gage cable from the doorframe location (see Figure 12) extending through the door header framing leaving a minimum of 12 in. (305 mm) of extra cable. The cable is to extend through the center of the framing approximately 5 in. (127 mm) in from the top (or side) corner of the door or where otherwise specified.

The cable should be run from the door header location to the specified location of the MRC19-MDS2 or MDS3 infrared transmitter. The transmitter is typically mounted above or to the side of the doorframe casing. A minimum of 12 in. (305 mm) of extra cable should protrude from the wall for connection to the infrared transmitter.

8 Modular Room Control (MRC) Series Digital Thermostat Installation Instructions

IMPORTANT: New Construction.

Clearance

4 to 6 in.

102 to 152 mm

Alternate

Location

(Door and Frame)

0.10 in. (2.54 mm) Minimum

0.50 in. (12.7 mm) Maximum

Note: The sensor is corner mounted and does not cover the cable if it is more than 3/4 in. (19 mm) out of the corner. Determine the specific location of the motion detector by establishing where the optimal coverage of the room occurs. The owner, project architect, and/or interior designer must review and approve the location.

Four-conductor 24-gage cable from

PIR Motion

Detector

PIR to Thermostat

FCU Cable

CINET Connection to Floor Bridge

Hole

Diameter

0.75 in. 19 mm

Figure 12: MRC19-MDS2 Installation

Motion Detector (PIR) Non-integrated in Thermostat

Note: Refer to the Modular Room Control

MRC19-PIR Series Motion Detector Sensors Installation Instructions (Part No. 24-9778-49) for

more detailed installation and wiring instructions.

Wall Mount

In each room where a non-integrated motion detector is required, run a four-conductor, 24-gage

cable from the location of the motion detector (typically the corner of the room), along with any other low-voltage cables directly to the MRC

thermostat (see Figure 13). Leave a minimum of 12 in. (305 mm) of extra cable at the thermostat for connections.

F/C

OFF/AUTOFANDISPLAY

MAKE UP ROOM

DO NOT DISTURB

MRC

Thermostat

Figure 13: MRC19-PIRW Motion Sensor Installation

Ceiling Mount

Mount the detector on a firm section of ceiling at a height of between 8 and 15 feet (2.44 and 4.57 m) and well away from neon or fluorescent lights.

Run a four-conductor, 24-gage cable from the location of the motion detector (along with any other low-voltage cables) to the MRC thermostat. Leave a minimum of 12 in. (305 mm) of extra cable at the thermostat for connections.

One end of the cable should extend directly out of the corner, 1-1/2 in. (38 mm) below the bottom of the crown molding (refer to architectural plans for crown molding dimensions). A minimum of 12 in. (305 mm) of extra cable should extend beyond the finished wall surface.

Modular Room Control (MRC) Series Digital Thermostat Installation Instructions 9

Operation

The following descriptions are the display and control button functionality for the standard MRC product:

F/C

OFF/AUTO FAN DISPLAY

MAKE UP

ROOM

DO NO T DISTU RB

Figure 14: Liquid Crystal Display (LCD) and

Control Buttons

• The OFF/AUTO button cycles the MRC between

OFF and AUTO modes. In AUTO mode, the MRC automatically determines the optimum valve and fan speed settings needed to maintain target (SET temperature). In the OFF mode, only the word OFF is displayed and the MRC is no longer in control of the fan speed or valve settings except for maintaining room temperature between programmed maximum and minimum limits.

• The FAN button is only functional when the MRC

is in AUTO mode. If pressed, the display first shows the current fan speed. If pressed again, fan speed cycles to the next higher speed, and that speed is displayed. After HI fan speed is reached, if the button is pressed again, fan speed cycles back to LO, and the sequence begins again. The MRC automatically adjusts valve settings in an attempt to maintain target temperature. After 10 minutes, operation reverts to full AUTO in which the MRC sets the fan to the speed best suited to maintain target temperature.

• The DISPLAY button cycles between SET (target)

temperature and ROOM (actual) temperature. When the MRC is activated and in AUTO mode, the SET temperature is automatically displayed. The ROOM temperature is only displayed if the DISPLAY button is pressed and then is displayed for only 5 seconds. Following that 5-second period, the display reverts to SET temperature.

Table 6 through Table 9 are four typical scenarios showing the automatic operation of the MRC under various temperature conditions.

Table 6: 2-Pipe, 3 Speed Fan FCU with Cold Water in Pipe

System State

(OFF/AUTO)

OFF

AUTO

Room Temperature Set Temperature Fan Valve

75° 72° 72° 72° 73° 72° 75° 72° 77° 72° 70° 72°

OFF CLOSED

LO OPEN

MED OPEN

HI OPEN

OFF CLOSED

Table 7: 2-Pipe, 3 Speed Fan FCU with Cold Water in Pipe and Continuous Fan Specified

System State

(OFF/AUTO)

OFF

AUTO

Room Temperature Set Temperature Fan Valve

75° 72° 72° 72° 73° 72° 75° 72° 77° 72° 70° 72°

LO CLOSED

LO OPEN

MED OPEN

HI OPEN

LO CLOSED

10 Modular Room Control (MRC) Series Digital Thermostat Installation Instructions

Table 8: 4-Pipe, 3 Speed Fan FCU with Hot and Cold Water Available

System State

(OFF/AUTO)

OFF

AUTO

Room

Temperature

75° 72° 72° 72° 73° 72° 75° 72° 77° 72° 70° 72° 67° 72°

Set

Temperature

Fan

OFF CLOSED CLOSED

LO OPEN CLOSED

MED OPEN CLOSED

HI OPEN CLOSED

LO CLOSED OPEN

HI CLOSED OPEN

Table 9: 2-Pipe, 2 Speed Fan FCU with Cold Water in Pipe, Heat Strip and Continuous Fan Specified

System State

(OFF/AUTO)

OFF

AUTO

Room

Temperature

75° 72° 72° 72° 73° 72° 75° 72° 77° 72° 70° 72° 67° 72°

Set

Temperature

Fan Valve

LO CLOSED OFF

LO OPEN OFF

HI OPEN OFF

LO CLOSED ON

HI CLOSED ON

Cold Water

Valve

Hot Water

Valve

Heat Strip

Valve

Table 10: Accessories

Description Part Number Corresponding Literature

5 Triac Expansion Board

6 Relay Expansion Board

5 Triac/2 AO Expansion Board

6 Relay/2 AO Expansion Board

IR Lamp Module - Non-Dimming

IR Wall Switch - Non-Dimming

Continued on next page . . .

Expansion Boards

MRC19-EXP1 –

MRC19-EXP2 –

MRC19-EXP3 –

MRC19-EXP4 –

Lamp and Lighting Control Devices

MRC19-LMP0

MRC19-LMP1

MRC Series Digital Thermostat Product Bulletin

(LIT-1201430)

Modular Room Control (MRC) Series Digital Thermostat Installation Instructions 11

Passive IR Detector, Wall Mounted

Passive IR Detector, Ceiling Mounted

Smart IR Eye to Communicate with Locks, Wall Mounted

Smart IR Eye to Communicate with Locks, Ceiling Mounted

Do-Not-Disturb/Make-Up-Room/Door Chime

Packaged Set of DND/MUR/Chime Including Wiring Harnesses

Oversized Adapter Plate 6.25” x 6.25”

Magnetic Door Switch, Wired, Core Mount

Magnetic Door Switch, Wired, Surface Mount

IR Transmitter w/ MRC-6MDS-0 (white)

IR Transmitter w/ MRC-6MDS-0 (black)

Remote IR Transceiver for Extender Cards

Motion Detectors (Cont.)

MRC19-PIRW

MRC19-PIRC

MRC Series Motion Detector Sensors Installation

Instructions (Part No. 24-9778-49)

MRC Series Motion Detector Sensors Installation

Instructions (Part No. 24-9778-49)

IR Eyes

MRC19-SIRW –

MRC19-SIRC –

MRC19-PKG0

DND/MUR/Door Chime Kit Installation Instructions

Peripherals

MRC19-PLT0 –

MRC19-MDS0

MRC19-MDS1

MRC19-MDS2

MRC19-MDS3

MRC19-EYE0 –

MRC Series Digital Thermostat Product Bulletin

(Part No. 24-9778-22)

(LIT-1201430)

12 Modular Room Control (MRC) Series Digital Thermostat Installation Instructions

Technical Specifications

Product

Power Requirements

Relay Contact Rating

Triac Relay Contact Rating

Recommended Wire Size

Thermostat Measurement

Range

Outdoor Air Temperature

Indication Range

Display Resolution

Minimum Deadband

°C/°F Conversion

Ambient Operating

Conditions

Ambient Storage

Conditions

Dimensions (H x W x D)

Shipping Weight

FCC Compliance

MRC Series Digital Thermostat

24 VAC at 50/60 Hz, 24 VDC nominal, 2.4 VA (MRC19-3xxxx and MRC19-4xxxx) 100 to 240 VAC at 50/60 Hz, 2.4 VA (MRC19-5xxxx) 265 to 277 VAC at 50/60 Hz, 2.4 VA (MRC19-6xxxx)

240 VAC, 2 ampere maximum

50 mA minimum, 250 mA maximum

18 gauge 33 to 99°F (1 to 37°C)

0 to 99°F (-18 to 37°C)

Setpoint: one decimal point; Actual Temperature: zero decimal point for °F and one decimal point for °C

2°F (1°C) between heating and cooling

Button located on front display 41 to 149°F (5 to 65°C), 0-95% RH noncondensing

33 to 149°F (1 to 65°C)

4.7 x 4.7 x 1.2 in. (120 x 120 x 30 mm)

0.6 lb (0.27 kg)

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case the user will be required to correct the interference at his own expense.

The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these specifications, consult the local Johnson Controls office. Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products.

Controls Group

507 E. Michigan Street P.O. Box 423 Published in U.S.A. Milwaukee, WI 53201 www.johnsoncontrols.com

Modular Room Control (MRC) Series Digital Thermostat Installation Instructions 13

Johnson Controls MRC Series Installation Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Application

Installation

Mounting

Wiring

Setup and Adjustments

Operation

Technical Specifications