LP-551 Rev. 3.9.16
31
D. 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,
Neutral, Ground (shown in Figure 22).
2. A line voltage fused disconnect switch may be required,
externally mounted and connected according to local codes
that may apply.
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 3 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.
E. 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
F. 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 21.
2. Connect all low voltage field devices to the low voltage
terminal strip located in the electrical junction box.
Failure to use the correct sensor may result in tank temperature
being either above or below set point, and could result in
decreased performance, substantial property damage, or
heightened risk of injury or death due to scalds.
G. Tank Sensor or Mechanical Control
Connect the tank sensor or mechanical controls to the TANK
SENSOR terminals (10, 11) of the low voltage terminal strip as
shown in Figure 22. The control will automatically determine
which type of sensor is connected and operate accordingly.
Caution should be used to ensure neither of these terminals
becomes connected to ground.
NOTE:
If sensor wires are located in an area with
sources of potential electromagnetic interference
(EMI), the sensor wires should be shielded, or the
wires routed in a grounded metal conduit. If using
shielded cable, the shielding should be connected to
the common ground of the boiler.
H. System / Pipe Sensor
The system/pipe
sensor can be
used to control
the temperature
of the storage
tank when a
tank
sensor
or mechanical
control cannot
be
mounted.
The system/pipe
sensor
would
be wired into
the terminals of
the low voltage
terminal
strip
as shown on
Figure 22. It is
important
to
note that when
a system/pipe
sensor is used, the circulating pump must be wired to
operate continuously; otherwise the boiler will short
cycle.
The system/pipe sensor can also be used in a cascade
system when the sensor is placed on the supply line
of multiple boilers that feed the storage tank. This
will control the temperature and modulate the firing
rate of the connected boilers. The system/pipe sensor
Figure 22 - VWH Control Wiring
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.
Содержание EP-220 VWH
Страница 33: ...LP 551 Rev 3 9 16 33 Figure 24 Cascade Master and FollowerWiring ...
Страница 34: ...LP 551 Rev 3 9 16 34 Figure 25 Internal Connection Diagram ...
Страница 57: ...LP 551 Rev 3 9 16 57 Figure 30 Combustion System Replacement Parts 220kBTU Model ...
Страница 58: ...LP 551 Rev 3 9 16 58 Figure 31 Combustion System Replacement Parts 299 399kBTU Models ...
Страница 59: ...LP 551 Rev 3 9 16 59 Figure 32 Replacement Parts All Models ...
Страница 67: ...LP 551 Rev 3 9 16 67 Maintenance Notes ...
