Installation
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 position).
Harman Home Heating recommends that
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.7
9
