Steffes 4140 Owner & Installers Manual - Manual (Page 16)

LINE VOLTAGE ELECTRICAL CONNECTIONS
In standard configuration, the Comfort Plus is wired for connec-
tion to 240V, however, the element circuits can also be con-
nected to 208V. A 208V connection derates the charging input
of the system by 25%. If a system rated specifically for 208V
or 277V is required, contact the factory. The controls circuit in
the Comfort Plus system MUST be connected to 240V/208V.
The 60 amp breakers located in the electrical compartment on
the Comfort Plus feed the core charging (element) circuits. The
15 amp breaker feeds the controls and blowers circuit.
If single feed to the element and blowers/control circuits is desired, the single feed kit is available to allow the system
to be powered with a one, larger line voltage circuit.
Installation
HAZARDOUS VOLTAGE: Risk of electric
shock. Can cause injury or death. Do not
energize the system until installation is
complete. Equipment MUST be installed
by a qualified technician in compliance
with all applicable local, state, and
national codes and regulations.
WARNING
AIR CONDITIONER/HEAT PUMP INTERFACE
When interfacing the Comfort Plus system with a heat pump, the
indoor coil MUST be placed on the return side of the Comfort Plus
system in a position that will provide even air flow through the coil.
If using a factory supplied return air plenum, the plenum is config-
ured to be the housing for the indoor coil. Remove the screws to the
plenum’s access cover and slide the coil into place inside the ple-
num. If not using a Steffes supplied return air plenum, the installer
will need to make provisions in the plenum to accommodate the coil
and air filter.
When interfacing a Comfort Plus system with an air conditioner, the
indoor coil can be placed on either the supply air or the return air
side of the system.
The condensate drain trap, in a heat pump or air conditioner installa-
tion, should be designed for the vacuum in which the system is
operating. Typically, taller traps are better suited for these types of applications.
Refer to the Room Thermostat Connections Diagrams (Figures 13, 14 and 15) for more information on interfacing
the Comfort Plus with a heat pump or air conditioner.
Installation 3.08 Comfort Plus
WARNING
Risk of fire. Any one ducting system
MUST NOT contain more than one
air handling (blower) system. If the
application requires multiple Com-
fort Plus systems or it is necessary to
have multiple air handlers share the
same ductwork, you MUST contact
Steffes Corporation. There are
special installation requirements
that MUST be performed in an
application such as this.
All Comfort Plus systems are factory configured to be field connected to multiple line voltage
circuits. If a single feed line voltage circuit is desired, an optional single feed kit is available.
SAMPLE SYSTEM IDENTIFICATION LABEL
FIGURE 11
To determine the correct wire size required for
each circuit feeding the Comfort Plus, refer to
the Specifications (Page A.01) and the system's
identification label located on the lower front of
a 3100 series system and on the lower left side
of a 4100 series system. (Reference Sample
Label Figure 11.)
Step 1 Remove the electrical panel cover.
Step 2 Route all line voltage wires through a
knockout and into the electrical panel
of the Comfort Plus.
Step 3 Make proper field wiring connections
to the Comfort Plus breakers. Refer
to the Line Voltage Wiring Diagrams
(Pages A.09 - A.12) for more informa-
tion on these connections.