LP-517 Rev. 000 Rel. 019 Date 7.21.20
30
KNOCKOUT LOCATIONS
FOR CONNECTION TO
ELECTRICAL JUNCTION BOX
LP-517-R
08/17/15
Figure 21 - Knockout Locations
B. Field Wiring
All connections made to the boiler in the field are done inside the
electrical junction box located on the side of the unit. The electrical
junction box is located on the left side of the boiler. Multiple knockout
locations are available to route field wires into and out of the electrical
junction box.
The control used in the boiler is capable of directly controlling 2 pumps
in standard mode and 3 pumps when configured as a cascade master
boiler. As a standard unit, each pump can provide a maximum of 2
amps at 120 volts. If a pump requires more than this amount of power,
an external contactor or motor starter is needed.
The electrical junction box has separate, clearly marked terminal strips
C. Line Voltage Wiring for Standard Boiler
NOTE:
A termination plug is included in the CAT 3
/ CAT 5 Bus Connection Point, labeled J3 in Figure
22. DO NOT REMOVE THIS PLUG! Doing so will affect
boiler operation and void warranty.
1. Connect the incoming power wiring to the line
voltage terminal strip in the electrical junction box at
terminals 120V, NEUT, and GND (shown in Figure 22).
2. A line voltage fused disconnect switch may be
required to be externally mounted and connected
according to local wiring codes.
3. Connect the boiler pump as shown in Figure 22
to the terminals marked 1 – (HOT), 2 – (NEUT), and
3 – (GND). The connections shown are suitable for a
maximum continuous pump draw of 2 amps at 120
volts. If the pump requires more current or voltage
than the 120 volts supplied, an external motor starter
or contactor will be required.
4. If using DHW, connect the domestic hot water
pump to the terminals marked 4 (DHW HOT), 5 (DHW
NEUT), 6 (DHW GND). The connections shown are
suitable for a maximum continuous pump draw of 2
amps at 120 volts. If a pump requires more current
or voltage than the 120 volts supplied, an external
motor starter or contactor will be required.
D. Alarm Connections
The control includes a dry contact alarm output. This
is an SPDT circuit, rated at 5 amps at 120 volts. This
contact can be used to activate an alarm light or bell
or notify a building management system if the boiler
goes into a lockout condition. The circuit between
the ALARM COM and NC terminals is closed during
normal operation and the circuit between ALARM
COM and NO is open during normal operation. The
connections depicted in Figure 22 show two 120 volt
lights connected to the alarm terminals. One light
will be on when the boiler is in normal mode and the
other light will be on when the boiler is in lockout
mode. HTP offers an Alarm System Kit (part # 7350P-
602).
E. Low Voltage Connections for Standard Boiler
1. All low voltage cables should enter the electrical junction box
through the provided knock out holes as shown in Figure 22.
2. Connect all low voltage field devices to the low voltage terminal
strip located in the electrical junction box.
F. Thermostat
1. Connect the room thermostat to the terminals marked 14 and 15
(THERMOSTAT) in the electrical junction box (shown in Figure 22).
Alternately, any dry contact closure across these terminals will cause
the boiler to run. Caution should be taken to ensure neither of the
terminals becomes connected to ground.
Figure 22 - Control Wiring
A. Installation Must Comply With
1. National Electrical Code and any other national, state, provincial, or
local codes or regulations.
2. In Canada, CSA C22.1, Canadian Electrical Code Part 1, and any local
codes.
for line voltage and low voltage wiring. Special jacks
are provided for trouble-free cascade system wiring
using standard CAT3 or CAT5 patch cables.
