Harman Stove Company SF160 - Manual (Page 9)


The circulator installed between the two boilers may be hooked up to run continuously during
the heating season or, an additional S350 control (not supplied) could be installed to turn it on and off
automatically. This control must be used as a “close on rise of temperature” (jumper in cooling posi-
tion).
Harman Stove Company recommends that 1-1/4 in. pipe be used between the two boilers. Also
recommended is that the first section of pipe off of the top of the Trident Boiler be threaded galvanized
or threaded black-steel pipe.
The Harman Trident Boiler is supplied with a dual function aquastat. The A350 is used to
control the automatic draft control whether open, to increase heat, or closed, to decrease heat. The
S350 is used as overheat protection. Since a wood or coal fire is still producing heat when the draft is
closed, this overheat protection is required. You could have the S350 energize a circulating pump or
a zone valve separate from the heating system, or it could be hooked up so that it flows the heated
water throughout the system. Either way, it must be able to flow away from the boiler.
Figure 7 shows a typical schematic of the Trident boiler as a “stand alone” system. Note; the
crossover pipe (#12) is not totally necessary but is recommended to provide circulation within the
boiler while the heating system is satisfied. This will ensure an even temperature within the boiler. The
tempering valve shown (#10) is to prevent excessive temperature of the domestic water.
FIG.
Installation