Description - Novar Savvy Service Manual

Savvy Service Manual
®

Description

2
WARNING! Some service and maintenance checks in this manual
require that the unit's power be turned on. Multiple
voltages at the rooftop unit present an electrical shock
hazard that can cause injury or death. Before attempting to
service Novar equipment, turn off power to the rooftop
unit at the disconnect switches. When performing the
service checks that require power, turn on the power as
necessary but be aware that the electrical shock hazard
exists. No one should perform the operations outlined in
this manual unless he or she meets both of the
qualifications specified above and is trained and
experienced in working with the following voltages:
24-VDC
24-VAC
110-VAC
208-VAC
277-VAC
480-VAC
Make sure that the 24-VAC power wiring is connected to
a dedicated transformer. No other devices (including the
outputs) should be powered by the transformer connected
to the Savvy.
Do not ground the transformer for this module on the
secondary side.
Make sure that the Savvy power cannot be switched off
accidentally. the Savvy requires continuous power for
proper operation.
The Savvy is mounted on a baseplate and powered by a 24-VAC, Class 2,
transformer connected to a 120-VAC source. A second 120-VAC circuit powers
the transformer for the outputs. The output terminal strip is rated 24-VAC, 2
amps, pilot duty. The outputs are controlled by low voltage triacs or relays.
The Hand/Off/Auto (HOA) switches are used for override for each output.
The remote override terminal strip allows remote, timed, or override capabilities
that are software-defined and driven. The remote override panel uses a
momentary dry contact.
A 22-gauge (minimum), 2-wire, shielded cable must be used for module network
communications. Cable length should not exceed 5000 feet.
The Class 2 input terminal strip is the termination point for 4- to 20-milliamp
current loop (analog) or contact closure (digital) inputs. All digital inputs must
be dry contact.
The Savvy draws 1.2-amp current. Terminals 75 and 76 (shown in Figure 1) are
used for the 24-VAC power connection. Terminals 39, 40, and 41 (see Figure 1)
are used for the Module Network Communications connections (2.5 VDC).
DOC. #TD-0240 11/30/06