Aquastats, Boiler Stage Relays, Etc.

Aquastats, Boiler Stage Relays, Etc.

PostBy: wilder11354 On: Mon. Nov. 21, 2011 10:22 pm

I am finally getting a grip on the controls that come with a SF260 harman. The Johnson Controls A350 (aquastat relay) is used to control the aux air blower for burn chamber when theres a heat loss(load demand) in water temp incoal boiler. The S350(stage) relay is the boiler Dump controller. The Y350 is the 24V transformer and bridge that interconnects the other 2 relays together and powers them.

Just trying to figure out how to stage the oil boiler, if possible off the A350, whithout interferring with blower operation. If possible, if not will need another aquastat for staging oil boiler off coal boilers temps for turning on circulator from oil boiler. Hmmmmmmm.
Hand Fed Coal Boiler: Harman SF260 Boiler
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: nut or pea, anthracite
Other Heating: crown oil boiler, backup.if needed

Re: Aquastats, Boiler Stage Relays, Etc.

PostBy: McGiever On: Mon. Nov. 21, 2011 11:21 pm

Been discussed previously...Dual Boiler Plumbing and wiring.
Stoker Coal Boiler: AXEMAN-ANDERSON 130 "1959"
Coal Size/Type: PEA / ANTHRACITE
Other Heating: Ground Source Heat Pump
Stove/Furnace Make: Hydro Heat /Mega Tek