LP-446-r4 Rev. 10.12.16
34
Figure 27 - Wiring Cascade System
Figure 28 - Cascade Termination Plug Detail
HTP recommends that the maximum length of communication
bus cables not exceed 200 feet.
4. Route the communication cables through one of the
knockouts in the cabinet.
5. Connect the boilers in a daisy chain configuration as shown
below. It is best to wire the boilers using the shortest wire
runs rather than trying to wire them in the order that they are
addressed. The communication bus jacks on the customer
connection panel are interchangeable so you can use either one
or both in any order to connect the cable.
If you have connected the boilers to each other properly, there
will be no open communication connection ports.
N. Cascade Master Pump and Sensor Wiring
1. Place the cascade master overlay sticker onto the field
connection board of the boiler designated as the cascade master.
2. If it is desired to have the boiler control the boiler pump,
connect the boiler pump to the BOILER HOT, BOILER NEUT,
and BOILER GND terminals.
3. Connect the system sensor to the terminals marked SYS
SENSOR.
4. Do not connect anything to the OUTDOOR SENS or
THERMOSTAT terminals.
5. If 0-10 volt positive going DC signal input is used, connect to
marked terminals.
O. Cascade Follower Pump and Sensor Wiring
1. Connect the boiler pump to the terminals labeled 1 (HOT), 2
(NEUT), and 3 (GND).
2. An alarm bell or light can be connected to the alarm contacts
of the follower boiler. The normally closed alarm contact may
be used to turn a device off if the boiler goes into lockout
mode. The alarm contacts are rated 5 amps at 120 VAC.
To connect an alarm device, connect the power for the device
to the ALARM COM terminal. Connect the alarm device hot
wire to the ALARM NO terminal. Connect the neutral or return
of the alarm device to the neutral or return of the power for
the alarm device.
To connect a device that
should be powered off
during a boiler lockout
condition, follow the same
instructions
as
above
except use the ALARM NC
terminal rather than the
ALARM NC terminal.
Note that in a cascade
system the alarm output
of the boiler addressed as
#1 will also be active if the
master boiler has a lockout
condition.
The
alarm
output of boilers addressed
as 2-7 will only activate an
alarm if a lockout condition
occurs on that specific
boiler.
Содержание MODCON500
Страница 35: ...LP 446 r4 Rev 10 12 16 35 Figure 29 Cascade Master and FollowerWiring...
Страница 57: ...LP 446 r4 Rev 10 12 16 57 Figure 35 500 Model Combustion System Replacement Parts...
Страница 58: ...LP 446 r4 Rev 10 12 16 58 Figure 36 700 850 Models Combustion System Replacement Parts...
Страница 60: ...LP 446 r4 Rev 10 12 16 60 Figure 38 Cabinet Replacement Parts All Models...
Страница 67: ...LP 446 r4 Rev 10 12 16 67 Maintenance Notes...
