Installation / Operation Instruction Manual

Page 35
SECTION 7 Electrical Connections
7.A Installation Warnings
CAUTION
The supply voltage to this unit must not be
disconnected, except for service or isolation, or
unless otherwise instructed by procedures outlined
in this manual. To signal a call for heat, use the 24V
eld interlock, as shown in the wiring diagram.
DO NOT MAKE AND BREAK THE LINE VOLTAGE
TO THE UNIT TO SIGNAL A CALL FOR HEAT. A
call for heat/end call for heat MUST be connected to
the eld interlock terminals. Some components are
designed to have constant voltage during normal
operation. If the units supply voltage is toggled as
a call for heat signal, premature failure of these
components may result.
The unit does not recognize 4mA as a signal to shut
o󰀨. If the call for heat is not connected between the
eld interlock terminals, the unit will remain in low
re when it sees 4mA as a modulating signal.
WARNING
The unit must be electrically grounded in accordance
with the requirements of the authority having
jurisdiction or, in the absence of such requirements,
with the latest edition of the National Electrical Code,
ANSI/NFPA 70, in the U.S. and with the latest edition
of CSA C22.1 Canadian Electrical Code, Part 1, in
Canada. Do not rely on the gas or water piping to
ground the metal parts of the unit. Plastic pipe or
dielectric unions may isolate the unit electrically.
Service and maintenance personnel, who work on
or around the unit, may be standing on wet oors
and could be electrocuted by an ungrounded unit.
Electrocution can result in severe injury or death.
Single pole switches, including those of safety
controls and protective devices, must not be wired in
a grounded line.
All electrical connections are made on the terminal
blocks that are located inside the control panel.
All internal electrical components have been prewired.
No attempt should be made to connect electrical wires
to any other location except the terminal blocks.
Figure 16. Electrical Connections
CAUTION
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
operation servicing.
ATTENTION
Au moment de l’entretien des commandes,
étiquetez tous les ls avant de les débrancher.
Les erreurs de câblage peuvent nuire au bon
fonctionnement et être dangereuses. S’assurer
que l’appareil fonctionne adéquatement une fois
l’entretien terminé.
Electrical
Raceway
(shown as
semi-transparent
for visual
purposes)
The control panel swings open for wiring access (also
see Figure 17 on page 36). Always run all eld wiring
to the left as illustrated, as running wires to the right
will prevent the opening of the control panel during
servicing.