How It Works  •  Advantages for the Building Owner  •  Advantages for the Contactor

Low Energy Consumption = Low Operating Costs
Left, Right, Front, Back and Top Combinations. All supply openings are painted black to block the view into the unit and when one unit is used for two rooms, a sight baffle is placed between the two grilles.

	Twos fans per unit - Fans are staged to operate when needed. At most conditions, only one fan is operating to provide room conditioning.
	Two pump loops per system - Intermediate seasons often allow one pump to be shut off. Due to the sizing of the unit to meet the required cooling load, only one pump is needed for heating in most circumstances.

By utilizing a reset schedule, the Whalen system will provide 100 percent of the required heating and cooling for the application. This also shuts down pumps when environmental conditions permit to further save energy. Most buildings run at peak capacity for only a few weeks a year. The 50/50 unit takes advantage of this fact by using smaller pumps that can be staged to run fewer hours than a single larger pump. When you couple this with the operation of only one of the two fans during part of the year, you achieve significant energy savings. The unit is practically maintenance-free with only the filter requiring periodic replacement or cleaning. You also will not find the control valves and piping joints that can lead to leaks and service calls.

Lower Installed Costs
Overall system main size is reduced by 50 percent since each side of a 50/50 unit handles 1/2 of total cooling requirement. This means smaller standard pumps and reduced labor times. By design, each unit is naturally balanced once flow is established in the riser. The balancing and venting of individual units is a task of the past. You get the benefits of a reverse return balancing system without the need to run an express riser within the building.

Valve Control Vs. Fan Cycle Control
If power consumption is the #1 feature of a unit, why is a continuously running fan recommended over fan cycling? Whalen takes the common sense approach on this issue. Most households select fan cycling control when offered the option of both systems. If a continuous running fan is preferred, then power consumption is not the primary concern. Whalen offers both types of systems to the customer.

Condensation and/or moisture are formed on the fins of any fan coil unit when high humidity (dewpoint) levels are allowed to exist in the surrounding space. The riser heat-exchanger system continuously dehumidifies the room air by allowing the chilled water coil to be active at all times. Units incorporating control valves to shut off the chilled water supply allow residential moisture formed during the dehumidifying process to re-evaporate into the airstream. The phenomenon is expedited when the fan is allowed to run continuously.

Due to the dual fan arrangement of the Whalen 50/50 unit provided superior dehumidifying at low load conditions typically found during intermediate seasons. By having a fan/coil combination more closely matched to the lower room load, the unit runs longer to remove moisture from the air. At these conditions, a unit with a single fan and water coil will cool the room to the setpoint temperature to quickly achieve adequate moisture removal.

Return Air Opening
The Whalen return air opening with an architectural aluminum grille is sized for easy removal of the fan motor and blower assembly. Unlike a unit with ball valves, flow control valves, balancing valves and coil with numerous joints, the return opening does not have to be enlarged and covered with a steel access panel. Whalen also offers hinged aluminum return air grilles that allow for changing the filter without the use of tools.

100% Cooling/Heating
The Whalen system is designed for energy savings and unit simplicity. By utilizing a reset schedule, the Whalen system will provide 100 percent of the required heating and cooling for the application. This can also permit pumps to be shut down when environmental conditions permit to further save energy.

Increased Reliability
By designing the 50/50 unit with two equally sized heat exchangers, 50 percent system redundancy is provided during peak heating and cooling season.

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