Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53400023-01
Printed in U.S.A.
Form 40W-8SI
Pg 1
1-16
Replaces: 40W-4SI
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. Fol-
low 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 inju-
ry 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) ther-
mostat 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
INSTALLATION
Controller Installation —
The controller should be
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.
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 con-
trol does not exceed 3,937 feet.
4.
Shielded 3-core control cable is required with no interme-
diate 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.
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
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 oth-
ers not to restore power until work is completed.
CAUTION
Failure to follow this caution may result in equipment dam-
age or improper operation.
Improper wiring or installation may damage the thermo-
stat. Check to make sure wiring is correct at the controller
and unit ends before proceeding with installation or turning
on unit.
40WAC,WAF,WAW,WAD,
WAH,WAU,WAV
Single-Phase VRF (Variable Refrigerant Flow) System
Central Controller Accessory
