Page 14 ZC-KI6_VSS1709
Provide at least R-12 of insulation above
ducts. If cooling is required, the branch
and trunk lines must be insulated and
sealed with a vapour barrier prior to
applying house insulation.
Risk of Freezing
Steps must be taken to prevent the
hot water coil from freezing. Coils
that have failed due to freezing and
damage caused by frozen coils are
not covered under warranty.
HRV and Fresh air connections
If a fresh air duct is required, make
connection to return air plenum at least
18 inches from filter. Insulate all fresh air
ducts.
Fresh air and HRV connections to
ductwork can pose a risk of dumping
cold air into ductwork during periods of
stand-by or continuous run. Calculate
mixed air stream temperatures and
provide interlock controls to prevent
freezing conditions.
Evaporator coils
The Zone Comfort is designed to provide
acceptable airflow for cooling even if only
one zone is operating in cooling mode.
However, a small, single-zone operating
for a long time or abnormal conditions
such as plugged filter can pose the risk
of freezing. All Zone Comforts with
electronic controls include a temperature
sensor that will detect a near freezing
condition and will interrupt the outdoor air
conditioner until it warms up. (Refer to
Controls User Manual).
Attic and crawl spaces
Air handlers may be located in areas
subject to freezing conditions. It is
necessary to protect the hot water coil
from freezing. Contact Vortex for freeze
protection options.
ELECTRICAL
Warning! - Make sure unit is properly
grounded. Locate air handler on a
separate electric circuit.
All air handlers operate on
115VAC/1ph/60hz line voltage, less than
12 Amps. All control circuits are low
voltage, either 24VAC or 0-10VDC.
Thermostat
The Zone Comfort
air handlers are
compatible with most thermostats. Some
electronic thermostats (primarily “power
robbing” types) require the addition of a
resistor between the W & C terminals
and the Y & C terminals. This is usually
covered in the thermostat instruction
manual. A 1,000 ohm, 5 watt resistor on
each of the W and Y terminals will
usually be enough to drain the current
required to power the thermostat. Some
thermostats will need 250 ohm, 10 watt
resistors on each of the W and Y
terminals.
Any zone with cooling will require a
heat/cool thermostat. The Zone
Comfort
air handler is compatible with
all standard setback thermostats.
Setback thermostats can be used to
achieve greater energy savings. Two-
stage thermostats are not required with
two-stage air conditioning. The Zone
Comfort™ will determine when to bring
on second stage cooling based on total
building demand.
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