Electrical Connections - IBC DC 23-84 Installation And Operating Instructions Manual

NOTE
The IBC boiler (like any modern
appliance that contains
electronic equipment), must
have a "clean" power supply,
and is susceptible to power
surges and spikes, lightning
strikes and other forms of
severe electrical "noise".
Power conditioning equipment
(surge protectors, APC or UPS
devices) may be required in
areas where power quality is
suspect.
WARNING
Do not apply power to any
connection point on the
controllers terminal strips. A
potentially hazardous situation
could occur which must be
avoided to prevent possible
serious injury or death.
NOTE
The IBC control only
recognizes a true dry contact
closure as a call for heat.
Thermostats and other devices
that use a "Triac" output
cannot be used as a call for
heat without the installation of
an intervening relay with dry
contacts to connect to the IBC
terminal strip.
NOTE
A hot water boiler installed
above radiation level or as
required by the Authority
Having Jurisdiction, must be
provided with a low water cut-
off device at the time of boiler
installation. If a low water
cut-off is not factory installed,
instructions shall be provided
for the installation and wiring
of a low water cut-off.
BOILER SYSTEMS AND OPERATION
DC SERIES COMBI BOILERS DC 23-84, DC 29-106, DC 33-124, DC 33-160
1.9

ELECTRICAL CONNECTIONS

All Electrical wiring to the boiler (including grounding) must conform to local
electrical codes and/or National Electrical Code, ANS/NFPA No. 70 – latest
edition, or The Canadian Electrical Code, C22.1 - Part 1.
If an external electrical source is utilized, the boiler, when installed, must be
electrically bonded to ground in accordance with the requirements of the authority
having jurisdiction or, in the absence of such requirements, with the National
Electrical Code, ANSI/NFPA 70, and/or the Canadian Electrical Code Part I, CSA
C22.1, Electrical Code.
1.9.1 120VAC Line Voltage Hook-up
Line-voltage wiring is done within the field-wiring box. (Refer to Section
6.2.Wiring Diagram on page 6-4). Connect the boiler to the grid power using a
separate, fused circuit and on/off switch within sight of the boiler. Use 14-gauge
wire in BX cable or conduit properly anchored to the boiler case for mains supply
and pump circuits.
The boiler is equipped with 3 x 1/2" electrical knock-outs located behind the
power supply terminal strip.
Connect the 120 VAC /15 amp power supply to the AC in connections located
to the right side of the controller. To access the terminal strip, remove the boiler
cover and slide open the controller drawer. Ensure 120 VAC polarity is correct
and that the boiler is properly grounded.
The DC Series boilers include a factory installed and pre-wired pump. The pump
is intended to supply adequate flow for the boiler's primary heating circuit only.
The system heating pump will need to be switched through a separate relay or
control box.
A second set of contacts is available to connect a DHW pump. This pump will
allow the connection of an indirect fired storage water heater to heating circuit
to take full advantage of the boilers heating capacity. The maximum amperage
rating of the connected pump is 2.3 amps. If the connected pump has a rating
higher than 1.0 amps, an external isolation relay is required to protect the boilers
controller.
A field supplied, external safety device can be connected to the boiler by
connecting the safety device in series with the boilers 120 VAC power supply.
Ensure the external safety device is rated to accept 120 VAC and the total
load connected to the boiler. For an interlock designed for the sole purpose of
protecting the heating circuit of the boiler, the Auxiliary Safety interlocks can be
wired in series with the Call for heat (X4.6 and X4.7). Do not apply power to the
X4 terminal strip. The Auxiliary Safety interlocks must be a Dry Contact.
4 5 6 7 8
X5
Figure 33: X4 Terminal Strip for connection of the DHW Aquastat (optional), Thermostat or
end switch's (mandatory), Outdoor Sensor (optional)
9 10 11 12
24 V =
X4 (24 V = )
12kOhm 12kOhm
0,1A 25°C 25°C
(cold closed)
~
120 V
X2 ( 120 V ~)
F1
(3,15 AT)
120 V ~ , 60 Hz
1-31