The optional Steffes ½ HP (Item #1302132) and ¾ HP (Item #1302134) variable speed air handlers are used to interface a Comfort Plus Hydronic with a centrally-ducted heating or cooling system. Each air handler includes a plenum assembly, variable speed supply air blower, water coil, air filter, and installation kit.
Operation
When the Comfort Plus Hydronic system receives a heat call from the air handler’s room thermostat, the primary loop pump (circulator) is energized to circulate water through the heat exchanger. At the same time, the air handler’s pump (circulator) and the variable speed supply air blower are energized. The pump circulates hot water through the air handler’s water coil and the variable speed supply air blower extracts heat from the water in the coil and delivers it to the appropriate heating zone through the ductwork. Since the air handler is attached to the side of the Comfort Plus Hydronic system, it also provides automatic static heat recovery. If used with a heat pump, the air handler monitors outlet air temperatures and provides comfort modulation. Above an outdoor temperature of 40°F/4°C, special operation occurs to improve efficiency.
NOTE: If the application is such that the air handler cannot be attached to the right side of the 5100 Series heating system, a third-party air handler can be used. In these applications, a discharge air sensor is required for comfort modulation.