
LP-325 Rev. 009 Rel. 004 Date 12.2.20
31
Part 7 - Wiring
A. Field Wiring
All connections made to the appliance in the field are done on the
field connection board located on the top left side of the cabinet.
Multiple knockout locations are available to route field wires into
and out of the cabinet.
The appliance is capable of directly controlling 2 pumps when in
standard mode and 3 pumps when configured as a cascade master
appliance. When configured as a standard unit, each pump output
can provide a maximum of 3 amps at 120 volts. If pumps require
more than this amount of power, an external contactor or motor
starter is needed.
If the appliance is configured as a cascade master, the appliance
pump output is a dry contact output capable of switching 5 amps at
120 volts in addition to the system pump and DHW pump outputs
sourcing 3 amps each.
An alarm bell or light can be connected to the alarm connection of
the appliance. The alarm connection may be used to power a 120V
device, and is rated 3 amps at 120 VAC.
The field connection board has separate, clearly marked terminal
strips for line voltage and low voltage wiring. Special jacks are
provided for trouble-free cascade system wiring using standard
CAT3 or CAT5 patch cables.
B. Line Voltage Wiring for Standard Appliance
1. Connect the incoming power wiring to the line voltage terminal
strip in the field connection board at terminals 120V, Neutral,
Ground. A line voltage fused disconnect switch may be required to
be externally mounted and connected according to local codes that
may apply.
2. Connect the central heating pump to the terminals marked 8
(HOT), 2 (NEUT), 3 (GND) in Figure 20. The connections shown are
suitable for a maximum continuous pump draw of 5 amps at 120
Label all wires prior to disconnecting them when servicing the
appliance. Wiring errors can cause improper and dangerous
operation. Failure to follow these instructions may result in
property damage or personal injury.
An ASSE 1017 thermostatic mixing valve MUST be installed when
using 0-10V or outdoor reset. Failure to do so could result in
substantial property damage, serious injury, or death.
Install wiring and electrically ground appliance in accordance
with the authority having jurisdiction or, in the absence of such
an authority, follow the National Electrical Code, NFPA 70, and/
or CSA C22.1 Electrical Code-Part 1 in Canada. Failure to follow all
applicable local, state, and national regulations, mandates, and
building supply codes for guidelines to install the electrical power
supply could result in property damage, serious personal injury, or
death.
Jumping out control circuits or components WILL VOID product
warranty and can result in property damage, personal injury, or
death.
It is of extreme importance that this unit be properly grounded. It
is very important that the building system ground is inspected by
a qualified electrician prior to making this connection. Electrical
power must only be turned on when the appliance is completely
filled with cold water. Failure to follow these instructions could
result in component or product failure, serious injury, or death.
ELECTRICAL SHOCK HAZARD – To ensure safety, turn off electrical
power supply at service entrance panel before making any electrical
connections to avoid possible electric shock hazard. Failure to do so
could result in property damage, serious personal injury, or death.
CAT3/CAT5 CONNECTION POINTS
GND
CONTROL
Figure 20 - Standard Appliance Customer Connection Board Detail
C. Thermostat
1. Connect the room thermostat to the terminals marked 14 and 15
on the field connection board. Any dry contact closure across these
terminals will cause the appliance to run. Take caution to ensure
neither of the terminals connects to the ground.
2. Mount the thermostat on an inside wall as centrally to the area being
heated as possible, but away from drafts or heat producing devices
such as television sets that could influence the ability of the thermostat
to measure room temperature.
3. If the thermostat is equipped with an anticipator and it is connected
directly to the appliance, the anticipator should be set at .1 amps. If the
thermostat is connected to other devices, the anticipator should be set
to match the power requirements of those devices. See the instruction
manual of connected devices for further information.
volts. If the pump requires more current or voltage other than 120
volts, an external motor starter or contactor will be required.
3. If using DHW, connect the domestic hot water pump as shown to the
terminals marked 4 (HOT), 5 (NEUT), 6 (GND). The connections shown
are suitable for a maximum continuous pump draw of 3 amps at 120
volts.
4. If a pump requires more current or voltage other than 120 volts, an
external motor starter or contactor will be required.