Honeywell W180 User Manual page 21

Device
W180A Controller Locate to minimize wire runs.
HVAC Equipment Where required.
S321A Touchpad In any room about 5 ft, 4 in. [1.6m] above
floor or as specified by customer. Do not
mount in high humidity areas. Can mount
in 3-gang electrical box.
T675A Temperature In duct where the sensing element is
Controller exposed to the average temperature. Do
not mount near hot pipes and cooling
coils.
C7180A Flush On inside wall about 5 ft [1.5m] above
Mount Temperature floor, away from hot or cold areas, water
Sensor pipes, air ducts, discharge air, dead air,
and radiation from lights, appliances, and
the sun.
TABLE 9—WIRING.
Mounting Location
21
W180 ZONE CONTROL SYSTEM
Notes
1. Requires dedicated 24 Vac, 40 VA
transformer to power W180A Controller.
CAUTION
To prevent damage to the W180A
Controller, do not connect either side of
the 24 Vac transformer secondary
to earth ground.
CAUTION
The W180 Zone Control System requires
an earth ground (18 AWG or heavier wire
connected to a cold water pipe).
WARNING
Wherever possible, avoid connecting
separate power sources to the same relay
set common. See the W180 Zone Control
System Programmer's Manual,
form 69-0761, for more information
regarding relay assignments.
2. If HVAC unit is more than 100 ft [30.5m]
from W180A Controller, calculate worst-case
power consumption, cable loop resistance,
and wire gauge that will allow 19 Vac (min)
to be applied to HVAC equipment. Use
isolating relays to lower long loop current
requirements.
3. Any HVAC control that requires more than
1A of continuous current at 24 Vac must be
separated from the W180A Controller output
with an isolating relay.
4. HVAC units must have low voltage controls.
Forced air zoning requires tree structure
where each zone has individual damper/valve
for control.
5. Requires separate transformer. Number of
actuators powered by each transformer
depends on transformer VA rating.
6. Up to three S321A Touchpads can be
powered from the dc power provided by the
W180A Controller.
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(Continued)
68-0139