17
Electrical
connections
The unit serial tag lists the unit
electrical characteristics such
as the required supply voltage,
motor amperage and required
circuit ampacities. The unit
wiring diagram shows all unit and
field wiring. The installer must be
familiar with the wiring diagram
before beginning any wiring
as the wiring can change from
project to project.
Electrical shock can cause
personal injury or death. When
installing or servicing system,
always turn off main power to
system. There may be more
than one disconnect switch.
Thermostat “OFF” should not be
used for disconnect purposes.
All field wiring connecting to
this type of unit must by 105 °F
rated copper conductor and
should be in accordance with the
National Electrical Code and any
applicable local codes. Branch
circuit fusing and electrical
disconnect means, if required,
must be furnished and installed
by others. All unit-mounted
control components are factory
wired to the junction control
box located in the electrical
end pocket of units. Remote-
mounted control components
are shipped loose for field
installation and wiring and are
to be wired in strict accordance
with the wiring diagram. Failure
to do so could result in personal
injury or damage to components
and will void the manufacturer
warranty.
All wiring connections should
be checked prior to start-up to
ensure connections have not
come loose during shipment or
installation, minimizing problems
during start-up.
The fan motor(s) should never
be controlled by any wiring or
device other than the factory
supplied switch or thermostat/
switch combination without
factory authorization.
Consult the factory wiring and
valve package diagrams when
installing an aquastat. The
switch should always be installed
upstream of the control valve on
a pipe that will have constant
flow regardless of the control
valve position, allowing a true
water temperature reading at all
times. A bleed bypass may be
required to guarantee proper
aquastat operation.
The applicable wiring diagram
ships with each unit and must
be strictly followed. Field
power supply wiring should be
through end pocket openings
or knockouts in the supplied
junction boxes.
All field wiring should be done
in accordance with governing
codes and ordinances. Any
modification of the unit wiring
without factory authorization will
void the warranty and nullify any
agency listings.
Zehnder Rittling assumes no
responsibility for any damages
and/or injuries from improper
field installation and/or wiring.
Electrical connections
