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or deterioration.
3. A frozen condensate line could result in a blocked vent condition.
It is very important to protect the condensate line from freezing
temperatures or any type of blockage. In installations that may
encounter sustained freezing conditions, the use of heat tape
is recommended to avoid freezing of the condensate line. It is
also recommended to bush up the condensate line size to 1" and
terminate condensate discharge as close to the unit as possible.
Longer condensate runs are more prone to freezing. Damages due
to frozen or blocked condensate lines ARE NOT covered by warranty.
4. Support of the condensate line may be necessary to avoid
blockage of the condensate flow.
5. To allow proper drainage on longer horizontal condensate runs,
tubing size may need to increase to 1" and a second line vent may
be required.
NOTE: To clean out condensate trap, see Maintenance section.
The condensate line must remain unobstructed. If allowed to
freeze in the line or obstructed in any other manner, condensate
can exit from the boiler tee, resulting in potential water damage
to property. When installing a condensate pump, select one
approved for use with condensing boilers and furnaces. The
condensate pump should have an overflow switch to prevent
property damage from spillage. Condensate from the boiler will
be slightly acidic (pH from 3.2 to 4.5). Install a neutralizing filter if
required by local codes.
Is is very important that condensate piping be no smaller than
3/4". Use a tee at the condensate connection with a branch
vertically up and open to the atmosphere to prevent a vacuum
that could obstruct the flow of condensate from the boiler. To
prevent sagging and maintain pitch, condensate piping should be
supported with pipe supports.
When installing a condensate pump, select one approved for use
with condensing boilers and furnaces. The pump should have an
overflow switch to prevent property damage from condensate
spillage.
Power to the optional condensate pump is continuous. When the
boiler is powered off the condensate pump will remain on. It is
important to remember to turn off the condensate pump when
powering down the boiler. Failure to do so could result in property
damage, severe personal injury, or death.
Part 7 - Wiring
To avoid electrical shock, turn off all power to the boiler prior
to opening an electrical box within the unit. Ensure the power
remains off while any wiring connections are being made. Failure
to follow these instructions could result in component or product
failure, serious injury, or death. Such product failure IS NOT
covered by warranty.
Jumping out control circuits or components WILL VOID product
warranty and can result in property damage, personal injury, or
death.
It is of extreme importance that this unit be properly grounded. It
is very important that the building system ground is inspected by
a qualified electrician prior to making this connection. Electrical
power must only be turned on when the boiler is completely filled
with cold water. Failure to follow these instructions could result in
component or product failure, serious injury, or death.
whl-445 Rev. 000 Rel. 014 Date 7.21.20
Electrical Shock Hazard - Turn off electrical power supply at service
entrance panel before making any electrical connections. Failure to
follow do do so could result in serious injury, or death.
Label all wires prior to disconnecting them when servicing the
boiler. Wiring errors can cause improper and dangerous operation.
Failure to follow these instructions may result in property damage
or personal injury.
Wiring must be NEC Class 1. If original wiring supplied with the boiler
must be replaced, use only TEW 105
must be electrically grounded as required by the National Electrical
Code, ANSI/NFPA 70 - Latest Edition.
Each boiler controller can pull a maximum of 6.3 amps at 120V. It is
recommended to wire each boiler to a dedicated minimum 15 amp
circuit.
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.
B. Field Wiring Terminations
All connections made
to the boiler in the field
are done inside the
electrical junction box
located on the left side
of the unit. Multiple
knockout locations are
available to route field
wires into and out of
the electrical junction
box.
C. 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 Mod Con series of boilers is capable of directly
controlling 2 pumps when in standard mode and 3 pumps when
configured as a cascade master boiler. When configured as a standard
unit, each pump output can provide a maximum of 3 amps at 120
volts. If pumps used require more than this amount of power, an
external contactor or motor starter is needed. If the boiler is configured
as a cascade master, the system pump output is a dry contact output
capable of switching 5 amps at 120 volts in addition to the boiler pump
and DHW pump outputs sourcing 3 amps each.
The electrical junction box has separate, clearly marked terminal strips
for line voltage and low voltage wiring. Special jacks are provided for
trouble-free cascade system wiring using standard CAT3 or CAT5 patch
cables.
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 23. 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
o
C wire or equivalent. Boiler
Figure 22 - Knockout Locations
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