7LINE VOLTAGE
ELECTRICAL CONNECTIONS
• To ensure proper operation and safety, all line voltage circuits must be
segregated from low voltage wiring.
• To reduce electromagnetic elds associated with electrical circuits
and to avoid induced voltage on sensors and electronic devices, the
circuit phases MUST be alternated as shown below.
• DO NOT install any wiring in the line voltage compartment of the
Comfort Plus Hydronic system unless it is rated for line voltage.
CIRCUIT PHASING CONNECTIONS
9JUNCTION BOX INSTALLATION
1. Attach the factory supplied junction
box to the left side of the Comfort
Plus Hydronic system.
2. Make connections to the primary loop
pump and air handler pump inside
this junction box. The red and white
wires connect to the primary loop
pump and the black and white wires
connect to the air handler pump. The
maximum connected amperage on
either of these circuits is 1.2 amps.
3 . Attach the junction box cover using
the screws provided.
If NOT utilizing the optional Static Heat Recovery Unit, the orange wire can be used to power a secondary pump.
8AIR CONDITIONER/
HEAT PUMP INTERFACE
The Air Handler (Item #1302132 or #1302134) is
an optional device used to interface the Comfort
Plus Hydronic with a ducted heating or cooling
system such as a heat pump or air conditioner.
The Air Handler includes a plenum assembly,
supply air blower, water coil, air lter, wiring
harness, and hardware kit. When the Comfort
Plus Hydronic system receives a heat call from
the room thermostat, it energizes the supply
blower and the Air Handler’s zone pump.
The Air Handler can be interfaced with a
standard heat pump system and will provide
comfort modulation. The system will monitor
the outlet air temperature and modulate in heat
from the Comfort Plus Hydronic as needed to
maintain the desired output air temperature.
The maximum coil size the Air Handler can
accommodate through the front access is:
1/2 HP: 30” x 22 5/16” x 22 3/4” (H x W x D)
3/4 HP: 33” x 25 5/16” x 22 3/4” (H x W x D)
Risk of re. Any one ducting system
MUST NOT contain more than one air
handling (blower) system. If the applica-
tion requires multiple Comfort Plus heat-
ing systems or it is necessary to have
multiple air handlers share the same duct
work, you MUST contact Steffes. There
are special installation requirements that
MUST be performed in an application such
as this.
WARNING
WARNING
IMPORTANT
LINE 2
LINE 1
LINE 2
LINE 1
LINE 1
LINE 2
LINE 1
LINE 1
LINE 2
THIS MUST BE A 120/240V OR 120V/208V CIRCUIT
NEUTRAL CONNECTION FOR CONTROL CIRCUIT
To Service (Breaker) Panel
(MODEL 5130 and 5140 ONLY)
CHARGE CIRCUIT #4
CONTROLS CIRCUIT
CHARGE CIRCUIT #1
CHARGE CIRCUIT #2
CHARGE CIRCUIT #3
Circuit Breakers
NEUTRAL
LINE 2
LUG
1. Route all line voltage wires through knockout(s) and
into electrical panel.
2. Make proper eld wiring connections.
IMPORTANT
HAZARDOUS VOLTAGE: Risk of electric shock, injury or
death. Do not energize the Comfort Plus Hydronic system
until installation is complete.
