User Guide

Zoning System Design Manual
9 70-2321—06
RH
RC
W1/E
W2
W3
Y1
Y2
G
O
B
DS/B
K
M28169
HVAC
FAN RELAY
24 VOLT TRANS.
G
Y
Y2
BK
C
R
W
COMPRESSO
R
RELAY
W2
EQUIPMENT
If using a Resideo TrueZONE panel, the panel's DS/
BK terminal is intended for use with a variable-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 reduc-
es blower speed on most variable speed blowers.
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 a CPRD or MARD (round) damper
with static pressure control (SPC) for bypass.
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.
M36667
DATS
(ALTERNATE LOCATION)
TrueZONE PANEL MOUNTED
ON RETURN DUCT
DATS (AT LEAST 3 FT)
FROM PLENUM
FURNACE OR AIR HANDLER
TrueZONE PANEL
MOUNTED ON WALL
SUPPLY DUCT
ZD SERIES
ZONE DAMPERS
CPRD PRESSURE
RELIEF DAMPER
Fig. 6. Typical upflow HVAC system.
Fig. 7. Typical horizontal
HVAC system.
Fig. 8. Wiring variable speed
fan to TrueZONE panel.
ZONE PANEL
DATS (AT LEAST 3 FEET
FROM PLENUM)
DATS
(ALTERNATE LOCATION)
TrueZONE PANEL
MOUNTED ON
RETURN DUCT
TrueZONE PANEL
MOUNTED ON WALL
CPRD PRESSURE
RELIEF DAMPER
RETURN DUCT
SUPPLY
DUCT
ARD
DAMPERS
M36668
Thermostats
Install thermostats using instructions
provided with thermostat. Wireless
thermostats can be used to speed
installation.