Electrical Connections/Wiring Diagram - Suburban DynaPack S Series Architects And Engineers' Manual

ELECTRICAL CONNECTIONS/WIRING
Suburban DynaPack A&E Manual 07/2019 Rev.6
ELECTRICAL CONNECTIONS
The DynaPack unit is approved using copper conductors only. See the unit
data plate for unit minimum circuit ampacity. Size the wire based on the unit
circuit ampacity, type of wire used, and method of wiring, in conduit or open.
If the electrical supply is 208 volt, then do not exceed 3% voltage drop based
on the length of wire run. See the National Electrical Code or the Canadian
Electrical Code for more information. When 208 volt supply drops below 197
volts, a field installed start assist kit will be necessary.
The typical electrical supply is two phase wires where voltage measured is
208-230 volts phase to phase. An additional wire for unit grounding is
required. See the unit data plate for the maximum fuse or circuit breaker size.
It is recommended that time delay fuses or a two pole HACR breaker be used
in order to prevent nuisance trips.
Alternately, the DynaPack unit may be wired with one phase wire where
the voltage measured is 208-230 volts phase to neutral. In this case, the
phase wire should be connected to L1 on the contactor. An additional wire
for unit grounding is required.
CONTROL WIRING
The room thermostat should be installed on an interior wall and near the
return air for the unit. It is recommended that a 5 conductor thermostat wire
be used in case the room thermostat needs power from the unit transformer.
The low voltage pigtails for the thermostat wiring must be routed to the
outside of the DynaPack unit for connection. The DynaPack unit contains a
second knockout above the control box for this purpose. The National
Electrical Code requires that low voltage wiring be kept separate from high
voltage wiring and cannot be routed through the same knockout or conduit.
Local codes may also require that an electrical box be installed on the low
voltage knockout to contain the electrical connections.
Follow the thermostat manufacturers instructions for mounting and wiring.
The low voltage is grounded inside the unit control box. See the wiring
diagram -
Figure 19 on page 27
On 208 volt systems the transformer wiring needs to be changed. Swap the
red transformer wire for the orange wire for 208 volt operation.
A disconnect should be installed next to the unit so the electrical power can
be turned off for servicing or maintenance.
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