40WAC,WAF,WAW,WAD,
WAH,WAU,WAV
Single-Phase VRF (Variable Refrigerant Flow) System
Central Controller Accessory
Installation and Operating Instructions
Part Number 40WA900024
CONTENTS
Page
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . 1
GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Controller Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
System Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Red Status Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Backlight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Power On or Reset Signal . . . . . . . . . . . . . . . . . . . . . . . . 5
Indoor Unit Address Display . . . . . . . . . . . . . . . . . . . . . 5
Individual Unit Operation. . . . . . . . . . . . . . . . . . . . . . . . . 6
Global Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Control Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Filter Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . .7,8
SAFETY CONSIDERATIONS
Read and follow manufacturer instructions carefully. Follow all local electrical codes during installation. All wiring
must conform to local and national electrical codes. Improper
wiring or installation may damage thermostat.
Understand the signal words — DANGER, WARNING,
and CAUTION. DANGER identifies the most serious hazards
which will result in severe personal injury or death.
WARNING signifies hazards that could result in personal injury or death. CAUTION is used to identify unsafe practices,
which would result in minor personal injury or product and
property damage.
Recognize safety information. This is the safety-alert
symbol ( ). When this symbol is displayed on the unit and in
instructions or manuals, be alert to the potential for personal
injury. Installing, starting up, and servicing equipment can be
hazardous due to system pressure, electrical components, and
equipment location.
GENERAL
The single-phase VRF (variable refrigerant flow) central
controller is a wall-mounted, low-voltage supply (24 vac) thermostat that can control 64 indoor units. The controller does not
require batteries.
The central controller accessory is available for use with the
single-phase VRF (variable refrigerant flow) indoor units listed
in Table 1.
Table 1 — Central Controller Accessory Usage
UNIT SIZES
40WAC Compact Cassette 007,009,012,015
40WAF 4-Way Cassette 009,012,015,018,024,030,048
40WAW High Wall 007,009,012,015,018
40WAD Ducted 007,009,012,015,018,024
40WAH High Static 024,030,036,048
40WAU Under Ceiling 012,015,018,024,030,036,048
40WAV Vertical 018,024,030,036,048
INSTALLATION
Controller Installation —
mounted:
• approximately 48 in. from the floor
• on a section of wall without water or drainage pipes
• typically in a mechanical room, facility manager’s office,
or central control room
To install the controller, perform the following procedures:
1. Turn off all power to the system (outdoor and all indoor
units.
The controller should be
WARNING
Electrical shock can cause personal injury and death.
Before installing thermostat, shut off all power to this
equipment during installation. There may be more than one
power disconnect. Tag all disconnect locations to alert others not to restore power until work is completed.
CAUTION
Failure to follow this caution may result in equipment damage or improper operation.
Improper wiring or installation may damage the thermostat. Check to make sure wiring is correct at the controller
and unit ends before proceeding with installation or turning
on unit.
2. Confirm that 24 vac power supply is available to power
the controller at this location.
3. Be sure that total signal wire length from the central control does not exceed 3,937 feet.
4. Shielded 3-core control cable is required with no intermediate joints. If a joint is necessary, make the connection
using a terminal block in an acceptable enclosure. All
three conductors and the shield must be connected at the
terminal block.
Manufacturer reserves the right to discontinue, or change at any time, specificatio ns or designs without not ice and without incurring obligations.
Catalog No. 04-53400023-01 Printed in U.S.A. Form 40W-8SI Pg 1 1-16 Replaces: 40W-4SI
5. Connect one end of the shielded 3-core control cable to
WHITE
BLUE
BLACK
BLACK
YELLOW
GRAY
a40-1879
FROM CENTRAL
CONTROLLER
TO INDOOR
UNITS
OUTDOOR UNIT
CONTROL WIRING
TERMINAL BLOCK
Fig. 1 — Control Wiring Terminal Block
Fig. 2 — Opening Back Mounting Plate
Fig. 3 — Attaching Back Mounting Plate
Fig. 4 — Central Controller Wiring
the control wiring terminal block on the outdoor unit. See
Fig. 1.
6. For wall-hung or under-ceiling/floor units, provide a 1-in.
by 1-in. square opening in the surface behind the unit to
route the shielded 3-core control cable, furred in to connect the indoor unit display panel to the controller.
For concealed ducted, high static ducted, cassette, or
vertical units, the shielded 3-core cable can be routed
through the plenum and the wall to connect the indoor
unit display panel and the controller.
7. Insert a flat-head screwdriver into the slots provided on
the top of the controller to open the back mounting plate.
See Fig. 2.
8. Attach the back mounting plate directly over the opening
in the wall, using 4 screws, and route the control cable as
shown in Fig. 3.
MOUNTING
SCREW
a40-1880
9. Connect the control cable and power to the back of the
controller and mount the controller back onto the mounting plate. See Fig. 4.
F1F2E
FORCED ON EMG. STOP
FORCED
ON
SWITCH
R
C
24 VAC
EMERGENCY
STOP
SWITCH
a40-1904
TO OUTDOOR UNIT
X,Y, E
X
NOT USED
Y
E
a40-1876
BASE
FRONT
COVER
2
System Wiring
X
X
Y
Y
E
E
CENTRAL CONTROLLER
OUTDOOR UNIT
a40-1875
Fig. 5 — Controller Connections
PQE
XYE
34(
34(
34(
34(
34(
5&
) ) (
;<(
MATCH RESISTANCE
OF COMMUNICATION
TERMINAL 120 Ω
MATCH RESISTANCE
OF COMMUNICATION
TERMINAL 120 Ω
OUTDOOR
UNIT
CENTRAL CONTROLLER
24 VA C
POWER
INDOOR UNIT
INDOOR UNIT
INDOOR UNIT
INDOOR UNIT
CONTROL BOX
INDOOR UNIT
CONTROL BOX
CONTROL BOX
CONTROL BOXCONTROL BOX
GROUND THE
SHIELD AT EACH
CONNECTION POINT
ONE CENTRAL CONTROLLER CAN CONNECT UP TO A MAXIMUM OF 64 INDOOR UNITS
a40-1881
Fig. 6 — Central Controller System Wiring
• When there are multiple controllers in the system, each
controller is assigned a unique address code from 0 to 15.
Duplicate addresses are NOT allowed.
• After a central controller is connected, DO NOT use an
ohmmeter to test signal cable resistance. This should be
done before the central controller is connected.
• Control cable is polarity sensitive and MUST NOT be
cross-connected. See Fig. 5 for correct connections.
• See Fig. 6 for complete system central controller wiring
diagram.
3
OPERATION
RED STATUS INDICATOR
POWER ON/OFF
LCD DISPLAY (SEE DETAIL BELOW)
(1.6)
INDOOR
UNIT
ADDRESS
DISPLAY
GRID
NOT USED
SWING
ON
NOT USED
ERROR/
PROTECTION
CODE
CENTRAL
CONTROLLER
OPERATION
STATUS
NOT USED
OPERATION MODE
SETTING
COOLING
MODE LOCK
HEATING
MODE
LOCK
REMOTE
CONTROLLER
LOCK
TOUCHPAD
LOCK
FAN SPEED
INDOOR UNIT
TEMP.
SETPOINT
INDOOR UNIT
OPERATING
MODE
TIMED
OPERATION
INDOOR
UNIT
TEMP.
FAHRENHEIT/
CELSIUS
LCD DISPLAY DETAIL
A40-1884
Fig. 7 — Central Controller Display
Figure 7 shows the central controller LCD display and button controls. Refer to this figure in the operation sections that
follow.
4
Red Status Indicator — A steady light indicates that at
00+
16+
32+
48+
00 01 02 06 07 08030405 09 10 11 12 13 14 15
a30-1885
Fig. 8 — Indoor Unit Address Grid
a40-1886
Fig. 9 — Main Display Screen Example
least one indoor unit is operating, or that the central controller
is sending a command to one or more indoor units. A slowly
flashing light indicates an indoor unit error or a communication
error. When the status indicator is off, no connected indoor unit
is operating.
Backlight — Press any button except RESET to backlight
the display. The backlight remains on while the central controller is being operated. It goes off automatically after 30 seconds
of inactivity.
Power On or Reset Signal — When the central con-
troller is powered on or reset, the controller beeps for 2 seconds
and the display screen lights. The controller then transmits a
signal to (queries) the indoor units, and the screen shows the
main display. The mode setting screen is then displayed.
Indoor Unit Address Display — Indoor unit ad-
dresses are displayed in a grid that indicates the status of each
unit. The display range is 00 to 63 (64 indoor units maximum).
The grid is composed of 64 boxes, each representing one indoor unit. The grid’s vertical coordinates are 00+, 16+, 32+,
and 48+. The grid’s horizontal coordinates are 00 to 15. The
sum of the vertical and horizontal coordinates is the address of
the indoor unit. (The unit’s location on the grid has no relation
to the unit’s physical location.) For example, the address of the
unit with the coordinates 48+,11 is 59. See Fig. 8.
Each indoor unit’s box in the grid contains 2 display blocks,
one large and one small. These signal the unit’s status as
shown below:
BLOCK
Large Connected Selected —
Small Power On — Error Power Off
STEADILY
LIT
LIGHT SIGNAL
SLOW
BLINK
FAST
BLINK
DIM
(NOT LIT)
Out of ser-
vice
Figure 9 shows an example display on the main display screen.
In this example 60 indoor units are in service. Twenty-eight are
on, and 32 are off.
• In the grid, the large blocks for the units from 16+,00 to
32+,15 are lit, and the small blocks are dim. This means
that the 32 units with addresses from 16 to 47 are connected but powered off.
• Both the large and small blocks for the units from 48+,09
to 48+,12 are not lit. This means that the four indoor
units with addresses from 57 to 60 are not connected.
• All the other large and small blocks in the grid are lit.
This means that all the other indoor units are connected
and powered on.
5
Individual Unit Operation
a40-1887
Fig. 10 — Settings Mode Display Screen (Example)
In this example:
1. The indoor unit with the address 01 is selected.
2. The unit is in Cooling mode, the fan speed is High, Swing mode is on,
and the set point is 72 F.
3. In the address grid, only the large and small blocks at addresses
00+,01 and 00+,15 are lit. This means only the indoor units with the
addresses of 01 and 15 are connected and powered on.
POWER A UNIT ON OR OFF — To power an individual
unit on or off, use the arrow buttons to navigate to the unit in
the address grid. Press the Power button one short press to turn
the unit on (if it is off) or off (if it is on).
CHANGE SETTINGS FOR A UNIT
1. Use the arrow buttons to navigate to the unit in the address grid.
2. Press SET.
3. Use the MODE, FAN, INC, and DEC buttons to set the
operation mode and parameters such as setpoint and fan
speed. (See the Control Summary section below for
details.)
4. Press OK to transmit all current settings to the selected indoor unit.
Global Operation
POWER ALL UNITS OFF OR ON
• Press the Power button one short press to power off all
units currently operating.
• If all indoor units are off, press the Power button one
short press to power on all units to the currently selected
parameters, such as mode, fan speed, and setpoint.
• Press the Power button one long press to send all commands to all indoor units, whether the unit is currently
powered on or off. All indoor units currently off will be
powered on, and all units will receive the commands.
CHANGE SETTINGS FOR ALL UNITS
1. Press SET to select all of the indoor units.
2. Use the MODE, FAN, INC, and DEC buttons to set the
operation mode and parameters such as setpoint and fan
speed. (See the Control Summary section below for
details.)
3. Press OK to transmit all current settings to all units.
Control Summary — Refer to Fig. 7 for the locations of
the buttons described below.
POWE R — Press to turn the selected indoor units on or off.
See the sections Individual Unit Operation and Global Operation above.
OK — While in Settings mode (see below), press OK to send
all active and updated commands to the selected indoor units.
SET — Press the SET button to enter Settings mode and to
toggle between an individual unit setting or a global setting for
all indoor units. (The default is a single indoor unit.) The settings of the first connected indoor unit are displayed. See
Fig. 10 for an example of a Settings mode display screen.
TIME ON/TIME OFF — While in Settings mode (see
above), press TIME ON to set up the delayed operation start
time for the selected indoor units. Press the INC button to select the start hour from 0 to 24 hours. Each button press increments the setting by
1
/2 hour for the first 10 hours, then by 1
hour. When the start time is correct, press TIME ON again to
set the start time. Press TIME OFF to set the delayed operation
stop time, use the INC button to set the time, and press TIME
OFF again to set the selected time. Press TIME OFF again to
exit timer mode and return to normal operation.
MODE — While in Settings mode (see above), press MODE
to set the operation mode for a single indoor unit or globally for
all connected indoor units. Each MODE press toggles to the
next operating mode selection.
IMPORTANT: Frequent changes to operating mode
may cause the system to malfunction. Allow at least
one minute between mode changes to allow the system
to stabilize.
FAN — While in Settings mode (see above), press FAN to set
the fan speed of the selected indoor unit (Auto Low Me-
dium High).
SWING — While in Settings mode (see above), press SWING
to enable or disable louver settings for the selected indoor units
(function not available on all units).
INC/DEC (TEMPERATURE SETPOINT) — While in Settings mode (see above), press INC (increase) to increase the
temperature setpoint by 1 degree. Press DEC (decrease) to decrease the temperature setpoint by 1 degree.
QUER Y — Press to display the operation status of a selected
indoor unit. The display defaults to the first connected indoor
unit. Use the right and left arrow buttons to navigate between
indoor units. Press and hold the right or left arrow button to
scroll through the connected units in the address grid. Use the
INC and DEC buttons to move to the next or previous row of
indoor units in the grid. See Fig. 11 for an example of a Query
mode display screen.
From the Main screen, pressing the up, down, right, or left
arrow button also activates Query mode.
6
LOCK — In Settings mode, press the LOCK button and the
a40-1888
Fig. 11 — Query Mode Display Screen (Example)
In this example:
1. The indoor unit with the address 01 is being queried.
2. The unit is in Cooling mode, the fan speed is High, Swing mode is on,
and the set point is 72 F. The room temperature is 74 F.
3. In the address grid, only the large and small blocks at addresses
00+,00 and 00+,01 are lit. This means only the indoor units with the
addresses of 00 and 01 are connected and powered on.
ON
123
a40-1891
Fig. 12 — DIP Switch Settings
DIP SWITCH ON OFF
1 3-Pipe Controller
2-Pipe Controller
(Default)
2
Fahrenheit
(Default)
Celsius
3
Optional Filter
Reminder
No Optional Filter
Reminder
(Default)
up arrow button at the same time to lock or unlock the operation mode setting for the system. Press and hold the QUERY
button and press the LOCK button to lock or unlock the central
controller touchpad.
RESE T — Press and hold the RESET button for 5 seconds to
reset the central controller to factory defaults.
Filter Cleaning — As set by the factory, error code EC
(change/clean filter reminder) is displayed for a unit when
2500 run time hours have elapsed.
A custom reminder and run time can be set instead. When
the custom filter reminder is turned on and the specified run
time hours have elapsed, the controller displays 88, which is
the custom filter reminder function code. After the filter is
cleaned, clear the code by pressing and holding the SWING
button and pressing the QUERY button at the same time. To set
a custom filter cleaning reminder, follow these steps:
1. Set DIP switch 3 on the central controller to ON (default
is OFF). See Fig. 12.
2. Power on the controller.
3. Wait 1 minute.
4. Press and hold the QUERY button and press the FAN
button at the same time. The controller displays 88 (the
display flashes).
5. Use the INC and DEC buttons to set the appropriate function as shown below.
FUNCTION CODE FUNCTION SETTING
00 Filter reminder off
01 Filter reminder on
6. Press OK.
7. Use the INC and DEC buttons to select the code for the
number of run time hours as shown below.
PARAMETER CODE TIME (HOURS)
00 0
01 1,250
02 2,500
03 5,000
04 10,000
8. Press OK. The controller displays the function code 88
and a “setting successfully” message. After 3 seconds the
Main screen is displayed.
TROUBLESHOOTING
The fault screen is displayed when an error is detected.
Fig. 13 shows an example. See Table 2 for a list of error codes.
7
Table 2 — Error Codes
In this example:
1. The indoor unit with the address 08 is being queried.
2. The unit with the address 08 has an error, code E1.
3. In the address grid, the small block at 00+,08 blinks, indicating an
error.
4. In the grid, only the indoor units at addresses 00+,00 and 16+,15 are
lit. This means only that only the indoor units with the addresses of 00
and 31 are powered on.
Fig. 13 — Error Display Screen (Example)
a40-1889
ERROR
CODE
DESCRIPTION POSSIBLE CAUSES POSSIBLE SOLUTIONS
Signal wires are short-circuited or
Check or reconnect signal wire.
disconnected.
Signal wire order is incorrect. Correct signal wire order.
E1
Indoor unit and outdoor unit
communication failure
Signal wires crossing over high voltage power
wires.
Signal wire close to electromagnetic source. Distance signal wires from electromagnetic
Separate and distance the signal wire from high
voltage power wires.
source.
Signal wire length exceeds 360 ft. Reduce the signal wire length.
PC board fault. Replace PC board.
Loose connection at port on PC board. Tighten the connection at port on PC board.
E2 T1 sensor malfunction
Sensor is short-circuited. Using multi-meter, measure resistance of the
sensor. If the resistance is 100 ohms, change
the sensor.
PC board fault. Replace PC board.
Loose connection at port on PC board. Tighten the connection at port on PC board.
Sensor is short-circuited. Using multi-meter, measure resistance of the
E3 T2A sensor malfunction
sensor. If the resistance is 100 ohms, change
the sensor.
PC board fault. Replace PC board.
Loose connection at port on PC board. Tighten the connection at port on PC board.
E4 T2B sensor malfunction
Sensor is short-circuited. Using multi-meter, measure resistance of the
sensor. If the resistance is 100 ohms, change
the sensor.
PC board fault. Replace PC board.
E5 Outdoor unit fault protection Outdoor unit fault. Refer to outdoor unit troubleshooting guide.
E7 Indoor unit EEPROM failure Chip or PC board fault. Replace PC board.
EC Change/clean filter reminder Run time has elapsed.
Clear the code by pressing and holding the
SWING button and pressing the QUERY button
at the same time.
EE Water level error
Loose connection or disconnected at port on PC
board.
Water level float is stuck. Inspect the float.
Trap slope is too steep. Adjust the trap slope.
Tighten the connection or reconnect at port on
PC board.
Drain pipe is too long. Adjust the length of drain pipe.
Drain pump faulty. Replace the drain pump.
Evaporator coils are covered with dirt and dust Clean the coils to increase heat transfer rate.
P0
© Carrier Corporation 2016
Catalog No. 04-53400023-01 Printed in U.S.A. Form 40W-8SI Pg 8 1-16 Replaces: 40W-4SI
Evaporator temperature
protection
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Incorrect sensor wiring Correct sensor wiring as per wiring diagram.
Sensor is short-circuited Using multi-meter, measure resistance of the
sensor. If the resistance is 100 ohms, change
the sensor.
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