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16 Operation of the HRV These Recirculating Models of HRV's will provide fresh clean air without sacrificing the savings of your energy conserving home. When outdoor air is required for pool room dehumidification, the aluminum cores of the HRV provide effective and efficient heat recovery exchange. Whether operating as an HRV or in recirculation mode, the energy efficient PSC blower motors provide reliable and cost effective operation. Operation: Humidity control is provided by an adjustable dehumidistat that is mounted in the pool room. The dehumidistat (supplied and mounted in the pool room in an accessible location 5' above floor level) would be set to a humidity level the operator finds acceptable (for example, in a range of 45 to 55% R.H.). If the humidity level in the room exceeds the setting of the dehumidistat, then outside air is brought into the system and humid air is removed from the room. If a duct heater or hot water coil has been installed in the supply ductwork, this will condition the incoming air. Control of this heater would be by a duct mounted thermostat. When the humidity level of the room falls to the dehumidistat setpoint, the pool room air is recirculated and no outside air will enter the system. Pool room air moves through the unit, then to the duct heater (optional) and returns to the pool room. Outside air is prevented from entering the unit during recirculation by the supply damper closing off. The exhaust fan to the outside is shut off during this time. Outside air does not enter the system until the pool room humidity exceeds the setpoint of the dehumidistat. The unit has an electronically controlled damper door defrost. If the dehumidistat has made its circuit and the unit is drawing in outside air, the defrost cycle will operate as follows: If the outside temperature drops below 27° Fahrenheit (-3 degrees Celsius) the defrost timer is activated. After waiting approximately 27.5 minutes (during which time the core unit may experience some frost build-up) the timer activates the damper door mechanism which closes off the fresh air supply port and opens the defrost port. After approximately 3 minutes the damper door reverses direction and re-opens the fresh air supply port and closes off the defrost port. This cycle repeats until the outside temperature again rises above 27° F. During the defrost cycle, pool room air is moved outside through the unit as well as from the pool room, back to the pool room. To handle the required air flow capacity, two ducts need to be connected to the pool room or one large duct. 17 Ducting Requirements & Mode of Operation Ventilation Mode In ventilation mode, both motors are running and air is being exchanged with the outside through the supply and exhaust ducts. Recirculation Mode In recirculation mode the supply motor continues to run and a damper moves to block off air entering from outside, drawing air instead from the conditioned space. The exhaust to outside motor is OFF when in recirculation mode. *NOTE: "Defrost" light is illuminated during "Recirculation Mode", indicating damper direction. 1. VENTILATION MODE Defrost Mode In defrost mode both the supply and exhaust motors run to draw air through the heat exchange cores. This mode is automatic and does not require field adjustments. Defrost light on side of cabinet illuminates to indicate defrost operation. TO POOL ROOM EXHAUST TO OUTSIDE ON ON FRESH AIR FROM OUTSIDE FROM POOL ROOM (CLOSED) O FROM POOL ROOM 2. RECIRCULATION MODE FRESH AIR FROM OUTSIDE (CLOSED) O FROM POOL ROOM FROM POOL ROOM O 3. DEFROST MODE O FROM POOL ROOM FROM POOL ROOM OOFF ON EXHAUST TO OUTSIDE TO POOL ROOM FRESH AIR FROM OUTSIDE (CLOSED) EXHAUST TO OUTSIDE TO POOL ROOM ON ON NOTE: The external low voltage contacts on a pool unit control the Ventilation/ Recirculation Damper only, not low/high speed control. 18 Speed Selection and Controls These recirculation models are equipped with a 3 speed control, low medium and high, (Note 1000RHC/ RHCAC must be set to high speed when air conditioning is required), as well as a lighted on/off switch and a low voltage terminal strip. The low voltage terminal strip is used to connect the supplied dehumidistat. Air Conditioning (DX) Coil Model 1000RHCAC Only The Direct Expansion (DX) Coil located inside the cabinet is designed to dehumidify the incoming fresh air from the outside and is not intended as an air conditioning unit for the space. The coil must be connected to an outdoor condensing unit, (this unit or it’s controls are not provided by NUTECH). Special care and attention should be given to ensure the Model 1000RHCAC is set to high speed during air conditioning mode, to avoid the coil from freezing up. ON/OFF SWITCH 3 SPEED CONTROL COMMON HIGHDehumidistat Setting Relative to Outside Conditions WINTER: Set dehumidistat between 30% to 40%. If home is too dry, adjust to higher setting. If home is too humid, adjust to lower setting. SUMMER: Set dehumidistat to OFF. not used ...

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