Install Instructions

Page 24
LAARS Heating Systems
BOILER PUMP CONNECTIONS
RATINGS
SIZES VOLTS PHASE AMPS
(Boiler, System Pump and
DHW Pump Connections)
80–210 120 Single 2* 115V – Maximum 1HP
No Pump or 7.4A max
80-210 Less
With Pump 120 Single than
115V – Maximum 1HP
6*
or 7.4A max
*
Minimum 15A circuit required
Table16. -NTHElectricalData
Section 7 -
ELECTRICAL AND WIRING DIAGRAMS
7.1  InstallationWarnings
7.2  MainPowerConnections
Connect a 15A fused, 120-volt supply to the main power
switch. (The hot leg is connected directly to the switch.) The
neutral leg is connected directly to the white wire. The ground
wire can be connected to the grounding lug on the control
panel. (See Figure 16.)
7.3 PumpConnectionsandOperation
The controller in the NeoTherm energizes the pump contacts
when it receives a call for heat. Once the call for heat is
satised, the pump will remain on for the dened pump
overrun time.
The Boiler Pump terminals (TB5 - max 7.4 FLA) are fed
by 120V (violet wire) internally from the main power feed.
The System and DHW contacts are dry contacts. Appropriate
voltage must be supplied to the System and DHW pumps for
proper operation.
The System pump connections are located on terminal block
5 (TB5) in the control panel. (See Figure 34.) The System
pump contacts are rated for 120Vac, 7.4 Amps. To use the
contacts, power must be supplied on one terminal with the
other terminal wired to the pump or a relay controlling the
pump.
The DHW pump connections are located on terminal block
5 (TB5) in the control panel and are rated for 120Vac, 7.4
Amps. To use the contacts, power must be supplied on one
terminal, and the other terminal wired to the pump or a relay
controlling the pump.
Additional 120VAC circuits may be required for the pumps.
Once the unit has been installed and set up, the Quick Start
menu provides a simple way to change the most common
settings used in a typical installation. (If your installation is
more complex, refer to Section 8C.) To reach the Quick Start
menu, press the “I” button (“Info/Install”), then press the
Quick Start menu item.
WARNING
The appliance must be electrically grounded
in accordance with the requirements of the
authority having jurisdiction or, in the absence of
such requirements, with the latest edition of the
National Electrical Code, ANSI/NFPA 70, in the
U.S. and with the latest edition of CSA C22.1
Canadian Electrical Code, Part 1, in Canada. Do
not rely on the gas or water piping to ground the
metal parts of the boiler. Plastic pipe or dielectric
unions may isolate the boiler electrically. Service
and maintenance personnel, who work on or
around the boiler, may be standing on wet oors
and could be electrocuted by an ungrounded
boiler. Electrocution can result in severe injury
or death.
Single pole switches, including those of safety
controls and protective devices, must not be wired in
a grounded line.
All electrical connections are made on the terminal
blocks that are located inside the control panel.
Wiring connections are shown in Figure 16.
All internal electrical components have been
prewired. No attempt should be made to connect
electrical wires to any other location except the
terminal blocks.
Caution
The supply voltage to the NeoTherm unit must not
be disconnected, except for service or isolation, or
unless otherwise instructed by procedures outlined
in this manual. To signal a call for heat, use the 24V
eld interlock, as shown in the wiring diagram.
DO NOT MAKE AND BREAK THE LINE VOLTAGE
TO THE NEOTHERM UNIT TO SIGNAL A CALL
FOR HEAT. A call for heat/ end call for heat MUST
be connected to the eld interlock terminals. Some
NeoTherm components are designed to have
constant voltage during normal operation. If the
NeoTherm’s supply voltage is toggled as a call for
heat signal, premature failure of these components
may result.
The NeoTherm unit does not recognize 4mA as a
signal to shut off. If the call for heat is not connected
between the eld interlock terminals, the NeoTherm
will remain in low re when it sees 4mA as a
modulating signal.