LAARS MagnaTherm MGV - Installation, Operation and Maintenance Instructions - Manual (Page 33)

MagnaTherm Boilers and Water Heaters Page 29
Three Phase Single Phase
600 480 208 120 240
L1 P BR Blk L1 Blk Blk
L2 V O R L2 Wht R
L3 T Y BL
Table 12.
Phase Voltage Color Identification
On three phase models a step down transformer
(which is protected using an appropriate din rail
mounted circuit breaker) generates 120 volt single
phase to power the 24 Volt Transformer. The 120
volt and 24 volt outputs of either transformer are
protected with resettable fuses mounted in the top
of the high voltage box. The 24 volt transformer is
also redundantly protected by its integrated 4 amp
resettable fuse.
On single phase models, the incoming voltage will
be protected by the appropriate circuit breaker sized
and installed, by a qualified Electrician/authorized
personnel. The 120 volt and 24 volt systems will be
protected with resettable fuses mounted in the top
of the high voltage box. The 24 volt transformer is
also redundantly protected by its integrated 4 amp
resettable fuse.
8.3 Pump Connections and Operation
The controller in the Magnatherm energizes the
appropriate pump contacts when it receives a call for
heat. Once the call for heat is satisfied, the pumps
will remain on for the defined pump overrun time.
The Boiler, System, and DHW pump terminals
are found on the Main control board TB1-15A
through 20A. They are fed 120 Volts internally
from the main power feed. The current rating
of the contacts is 7.4 amps, and an appropriately
sized contactor must be supplied and installed
by a qualified technician to ensure proper pump
operation. Once the system has been installed, the
“Pump Configuration” menu will allow the installer
to adjust Pump control, Overrun time and Demand
control for the various pumps in the system.
Caution
The supply voltage to the MagnaTherm must
not be disengaged, except for service or
isolation, or unless otherwise instructed by
procedures outlined in this manual. To signal
a call for heat, use the correct terminals as
instructed in Section 8.
Table 13. Electrical Data
Model 2000 2500 / 3000 3500 / 4000
Voltage 120 220 208 3 ш 480 3 ш 600 3 ш 120 220 208 3 ш 480 3 ш 600 3ш 120 220 208 3 ш 480 3 ш 600 3 ш
Nominal
Current
15.1 8.8 7.0 3.2 2.8 N/A N/A 12.5 5.0 4.0 N/A N/A 113 4.8 4.4
FLA 22.6 11.3 12.7 6.2 4.5 N/A N/A 19.4 8.7 5.9 N/A N/A 19.4 8.7 5.9
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.