Harman Trident SF160, Installation & Operating Manual, Page: 7 / 24

7
3-90-70742R11_05/13
Wiring and Electrical
following the wiring diagram, run all wires to their designated
connections. save the main power for the last hook-up,
and leave the breaker in the off position. The sensor wires
attach to the a350 Controller on the terminals marked “sen”
and “com”. Make sure the sensor is submerged fully into the
well and secured with the set-screws.
Setting The Aquastat
Inside the a350 control, you will see a square jumper, and
a differential dial. Be sure the jumper is in the “Heating”
position. The differential dial is set to determine how
low, below the temperature set point, you want the water
temperature to go before the automatic Draft Control
opens. a good initial setting for this dial is 5°. Be sure the
120V wires are attached to the common and the normally
open terminals, and replace the cover. The external dial is
set for the water temperature you wish to maintain, a good
setting is 180°.
Inside the Y350 control, ensure that your wires are
connected to the 120VaC terminals, and replace the cover.
Inside the s350 control, which is used as overheat
protection, you’ll see two dials; offset, and differential.
There is also a jumper which, in this case, gets placed in the
“cooling” position. The offset dial sets the number of degrees
above the a350 set point that you want the overheat dump
to activate. a good set point would be 20°. That would mean
that if the water reaches 200°, using the a350 set point of
180°, the s350 would close it’s contacts and energize the
overheat dump zone. The differential dial sets the point that
the overheat dump would stop. With the differential set at
15°, using the temperatures above, the circuit would re-
open, stopping the overheat dump at a water temperature
of 185°. The 120V wiring is attached on the normally open
and the common position. The normally closed position is
not used.
Re-install the covers onto the three Controls.
Optional Items
There is a domestic hot water coil available for your Trident
Boiler. The coil installs in the front of the boiler, and allows
your domestic water to be heated by the heating system
water. Install the coil now, by removing the round plate and
replacing it with the coil and it’s round plate. Be sure to
tighten the bolts evenly, to ensure a good seal.
If electric back-up is desired, install now. There will be two
additional control boxes to add to your aquastat, which will
require the use of a longer din rail. The two heating elements
will install into the front of the boiler as shown in fig. 1
Venting
The Harman® Trident Boiler must be installed into a chimney
approved for solid fuel burning appliances. In the U.s., the
boiler must be connected to; (1) a prefabricated chimney
complying with the requirements for Type HT chimneys in
the standard for Chimneys, factory Built, Residential Type
and Building Heating appliances, Ul 103. Or; (2) a code
approved masonry chimney with a flue liner. In Canada, with
prefabricated chimney systems tested and listed to the High
Temperature Chimney standard UlC s-629, or with a code
approved masonry chimney. The minimum recommended
height for any chimney is 16 ft. (4.8m) above the flue collar.
Do not reduce flue diameter. nominal size flue is 8 X 8 in.
or equivalent, up to 8 X 12 in. Codes also require that the
chimney must extend a minimum of
Installation
FIG. 4