10
INTELLIZONE2 INSTALLATION MANUAL
WARNING: All wiring must comply with local
and state codes. Disconnect the power supply
before beginning to wire to prevent electrical
shock or equipment damage.
Mount the transformer onto the side of the unit’s control
box on the 5 Series and on the back of the control box on
the 7 Series by inserting and tightening screws (provided)
into the pre-punched holes. Thread all transformer wires
through the hole with bushing and follow the wiring
schematic for connecting the transformer primary and
secondary leads as shown in Figure 15 (5 Series) and Figure
16 (7 Series).
For zone transformer mounting on split system heat pumps
refer to the Split Section of the manual.
For 208 volt operation, the red and blue transformer wires
must be switched. Use wire nuts only for connections to
thermostat wire.
Transformer Sizing
The heat pump transformer should never be used to power
the zone dampers. Damage to the heat pump or dampers
may occur. Providing adequate transformer power (VA)
to supply the system is an important requirement. Each
IntelliZone2 3-wire damper requires 3.0VA at nominal
voltage and each 2-wire damper requires 7.0VA at nominal
voltage. The standard available transformer is a 75VA
with an integrated circuit breaker (Part # ZTK240). The
Transformer ‘VA’ Calculation table shows a sample sizing
procedure for both the 3-wire and 2-wire dampers that
should be carried out for each installation. If the total VA is
greater than 70VA, then a second 75VA transformer should
be wired in parallel to provide a total power capability
of 150VA. As the ‘VA’ Calculation table shows the 2-wire
damper requires much more VA than the 3-wire damper.
Transformer ‘VA’ Calculation
Zone
Number of Dampers
Powered in Zone
3-Wire
Actuator
2-Wire
Actuator
1
1
3.0
7.0
2
1
3.0
7.0
3
2
6.0
14.0
4
3
9.0
21.0
5
2
6.0
14.0
6
1
3.0
7.0
Total VA Draw (10 Dampers)
30.0
70.0
Electrical Wiring cont.
Figure 15: Mounting and Wiring Transformer to Control Box (5 Series shown)
R
C
P18
Damper Power
F1 Damper
Fuse
Black/White
5A Fuse
IntelliZone2
Relay Board
Primary Leads
Secondary
Leads
Zone
T
ransformer
75 VA
(PN) ZTK240
Black
Blue
Red
Yellow
AXB
ABC
PB2
