2. Use vibration isolators (flex connectors) on zone dampers and
duct work to minimize noise.
3. Place dampers away from areas that may be noise sensitive.
4. TXV is required in air conditioning and heat pump applica-
tions.
5. Use separate isolated transformer to supply power to Comfort
Zone System (50 va minimum, class 2, field supplied).
6. Load calculations must be performed to determine equipment
size. Equipment selection is matched to block load. It is
imperative equipment is not oversized.
7. Duct work must be designed based off the sum of peaks plus
25 percent oversize. It is imperative duct work is not under-
sized.
INTRODUCTION
This installation guide pertains to revision 1.6 or greater. The
Comfort Zone System allows air conditioning and heating equip-
ment to control temperatures in up to 4 distinct spaces or Zones
within a building. Each zone has independent temperature settings.
The comfort temperature settings can change automatically
through the use of schedules. This allows Comfort Zone to change
temperature settings in zones to reflect occupancy or usage. For
example, you can condition the bedrooms in a home from 5:00 PM
through 7:00 AM or the kitchen from 3:00 PM through 6:00 PM.
The Comfort Zone System uses motorized air volume control
dampers (also called zone dampers) to regulate flow of condi-
tioned air into zones. In this manner Comfort Zone can selectively
heat or cool certain portions of a building depending upon space
temperature requirements.
INSTALLATION
Step 1—Check Equipment and Jobsite
INSPECT EQUIPMENT — File claim with shipping company,
prior to installation, if shipment is damaged or incomplete.
Step 2—Wiring
To prevent personal injury or possible equipment damage
disconnect power supply before routing wire.
All wiring must comply with local and state codes.
NOTE:
A remote room sensor requires a 2-wire cable, however,
it is recommended that a 5-wire cable be installed to allow for a
possible smart sensor upgrade. Connect white wire to terminal
labeled B- if a 5-wire cable is used. Connect red wire to R+.
Shielded cable is recommended to reduce noise interference.
NOTE:
Use No. 22 AWG color-coded, insulated (35°C min)
wire. If thermostats are to be located more than 100 ft from
Comfort Zone Center as measured along control voltage wires, use
18 AWG colored-coded wires to avoid excessive voltage drop.
All wiring is run back to Comfort Zone Center. Keep wires a
minimum of 12 in. from any AC voltage. Do not tie-wrap wires
together. When wiring to COM BUS, a 3-wire cable must be
separate from the 5-wire cable. The thermostats should be located
approximately 5 ft above floor and must be located within 200 ft
of Comfort Zone Center.
SHIELDED CABLE
General
1. All wiring should be shielded (except damper wiring) with 18
or 22 gage. The 3-wire, 5-wire, and Remote Sensor wire must
be in separate jacketed cable.
2. All system wiring must be within 1 building. Never connect
devices between 2 or more buildings.
Shielding For A Single Comfort Zone System
1. Fig. 16 Shows a Comfort Zone System with all possible
options. The shield from all devices should be tied together at
I/O board and terminated at shield ground at lower right hand
corner of board. Be sure shielding does not touch any other
wiring on board.
NOTE:
Do not connect shield wire at device end. Cut end and
tape up to avoid shorting.
Shielding For Multiple Comfort Zone Systems
1. If more than 1 Comfort Zone System resides on 1 job, they
may be tied together for communication purposes. If no
communication is required, then Comfort Zone System should
be wired separate and shielded as previously stated.
2. When 2 to 4 systems are on 1 job and require communication,
they should be daisy chained together through 3-wire commu-
nication bus at COM BUS HAM terminal.The shielding
should only be grounded at 1 point on end of communication
bus as shown in Fig. 2.
3. If more than 4 systems are used on 1 job, multiple device
buses must be used. Each device bus must be separated by an
ISOSAT-01. A typical arrangement is shown in Fig. 3.
Communication Bus Guidelines for Maximum Number of
Devices
1. The maximum number of Comfort Zone Systems allowed on
1 device bus is 4.
2. Four Zone Controllers must be addressed 4 addresses apart,
example 4, 8, 12, 16 for a device bus with 4 Comfort Zone
Systems.
3. Home Access Module (optional) will scan a maximum of 4
Comfort Zone Systems.
4. Multiple device buses can be tied together for communication
via ISOSAT-01. An ISOSAT-02 is required for remote or
direct communications via personal computer or modem. (See
Fig. 4.)
5. Comfort Zone Systems may reside on a bus with VVT system
devices. They may receive or broadcast time to these devices
accordingly by toggling T5 enable broadcast on or off.
NOTE:
If multiple 4-zone controllers are on 1 bus, only 1 can
broadcast time. Turn all others off (T5).
Fig. 2—Daisy-Chained Comfort Zone Systems
A93251
Comfort
Zone
I/O
Comfort
Zone
I/O
Comfort
Zone
I/O
Comfort
Zone
I/O
SHIELD DRAIN WIRE
SHIELD DRAIN WIRE
NOTE 2
NOTE 1
NOTES:
1. Use butt splices, or solder, for shield connections. Then tape up shield.
2. Do not connect the shield drain wire at the end of Communication Bus.
Cut and tape up to avoid shorting.
2
