Laars MagnaTherm HTD Series, Инструкция по установке и эксплуатации

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Page 33
HTD
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
field 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 field 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
off. If the call for heat is not connected between the
field interlock terminals, the unit will remain in low
fire 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 floors
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.
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 fils 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
Racewayi
shown as semi-
transparent.
Figure 16. Electrical Connections