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Transformer - Honeywell TrueZONE HZ311, HZ322, HZ432 Manual

Zoning system design manual
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The zone panel is typically installed near the indoor unit, in a garage, crawl space, basement, or attic. Zone panels
are often installed on the return air duct. However, in some heat pump applications, the homeowner or building
occupant may require access to the panel to change
into the emergency heat mode. To meet these needs,
install the panel in a utility closet or other convenient
area where the panel is easily accessed.
ZONE PANEL
(WALL MOUNT)
RETURN
DUCT
ZONE PANEL
(DUCT MOUNT)
Fig. 6. Typical horizontal
HVAC system.

Transformer

Mount and wire a dedicated transformer to the zone panel. The AT140A1042 is rated to 130°F (54°C). If it is to be
mounted in an attic that may get much hotter, install the AT175A1008, which is rated to provide 50 VA at 165°F (74°C).
Connect power to the zone control panel after all other wires are attached.
Variable Speed Fan
A variable speed fan or ECM blower changes blower speed to deliver a constant CFM regardless of static pressure.
To use zoning with a variable speed fan, plan and install zoning normally, and use an SPRD or a MARD (round)
damper with static pressure control (SPC) for bypass.
HVAC
24 VOLT TRANS.
C
R
W
W2
FAN RELAY
G
BK
Y2
Y
Fig. 7. Wiring variable speed
fan to TrueZONE panel.
COMPRESSOR
RELAY
BYPASS
DAMPER
DATS
(ALTERNATE LOCATION)
DATS
SUPPLY
DUCT
RH
RC
W1/E
W2
W3
Y1
Y2
G
O
B
DS/BK
M28169
SPRD BYPASS DAMPER
DATS
(ALTERNATE LOCATION)
TrueZONE PANEL MOUNTED
ON RETURN DUCT
DATS (AT LEAST 3 FT
FROM PLENUM)
FURNACE OR AIR CONDITIONER
Fig. 5. Typical upflow HVAC system.
ARD
Thermostats
DAMPERS
Install thermostats using instructions
provided with thermostat. Wireless
thermostats can be used to speed
installation.
M28164
If using a Honeywell TrueZONE panel, the panel's
DS/BK terminal is intended for use with a vari-
able-speed fan. When one zone is calling (or less
than 25% of capacity on systems with more than 4
zones), this terminal will be de-energized of 24 VAC.
This reduces blower speed on most variable speed
blowers.

Zoning System Design Manual
Zone Panel
ZD SERIES
ZONE DAMPERS
TrueZONE PANEL
MOUNTED ON WALL
70-2321—03
SUPPLY DUCT
M24921

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