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 sensor.
Recognize safety information. This is the safety alert symbol.
When the safety alert symbol is present on equipment or in the
instruction manual, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies a hazard that
could result in personal injury or death. CAUTION is used to
identify unsafe practices which would result in minor personal injury
or property damage.
In applications where additional wiring cannot be run, the Add-A-
Wire™ accessory can be used to add a wire to the thermostat. The
accessory is also used to fix a broken wire, to make one thermostat
work like two, add cooling to a heat only system, or add a common
wire to a 4-wire system (the green and yellow wires of the Diode ‘Y’
may not be connected to the R or C terminal of the thermostat).
Step 1 – Location
The Add-A-Wire accessory
can be mounted
inside the HVAC unit or inside the control box. The Add-A-Wire
accessory should not be installed in a location where the accessory or
wiring may be exposed to the elements. Wires running from
accessory are 9-in. Long. Add-A-Wire accessory should be within
9-in. Of thermostat connections to HVAC terminal block.
If required, mount the Add-A-Wire accessory with 2 screws (not-
provided). See Fig. 1.
–
Step 2 – Wiring Requirements –
The Add-A-Wire accessory wiring
has the following requirements:
1. All system wiring must be in compliance with all applicable
local and national codes.
2. All wiring should be color coded in conformance with standard
recommendations.
3. All wiring should be 18- 22-gage, unshielded wire. The
Maximum distance between the accessory and the thermostat for
18-gage wire is 100ft. The maximum distance between the
Accessory and the thermostat for 22-gage. Wire is 36 ft.
Step 3 – Accessory Wiring
Depending on the application and the usage of the Add-A-Wire
accessory, wiring will vary. Refer to the wiring diagrams in Fig. 2-5
for more information on wiring the accessory.
The BLUE wire of the Add-A-Wire accessory must always be conn-
ected to the BLUE wire of the Diode ‘Y’.
DO NOT connect the Add-A-Wire accessory BLUE, GREEN, or
YELLOW wires to the R and C terminals of the HVAC unit, dam-
age may result.
The GREEN and YELLOW wires of the Diode ‘Y’ should be regar-
ded as extensions of the yellow and green wires of the Add-A-Wire
accessory. For example, if the YELLOW wire on the Diode ‘Y’ is
connected to terminal W on the thermostat to control heat, the YEL-
LOW wire on the Add-A-Wire accessory must be connected to W
on the HVAC unit to control heat. If the GREEN wire on the Diode
‘Y’ is connected to terminal G on the thermostat to control the fan,
the GREEN wire on the Add-A-Wire accessory must be connected
to G on the HVAC unit to control the fan.
Use the wirenuts for wire connections to the Diode ‘Y’.
The wiring diagrams are examples of the uses of the Add-A-Wire
accessory. Each example may have more than one method of conn-
ection that will work. An experienced installer may use different
combinations to achieve desired results.
Do not connect the green and yellow wires of the Diode ‘Y’ to the R
or C terminal of the thermostat.
SAFETY CONSIDERATIONS
IMPORTANT: Read entire instructions before starting
the thermstat.
GENERAL
INSTALLATION
!
CONTENTS
CONTENTS
Add-A-Wire Accessory
Diode ‘Y’
Wire Nuts
QUANTITY
1
1
4
Before installing Add-A-Wire accessory, turn off all power to
the unit. There may be more than one power disconnect.
Electrical shock can cause injury or death.
WARNING
!
INSTALLATION INSTRUCTIONS
ACC0410
MODEL
©Venstar Inc. 08/07
P/N 88-618 Rev. 1
ADD-A-WIRE™
ACCESSORY
