Nu-Air CEA15-R Operating Instructions Manual

Contents

Nu-Air CEA15-R Operating Instructions Manual Manual pdf 11 page image

Rev. December 19, 2008 Page 11 of 19Damper Defrost – On damper/recirc. models, the temperature sensor is located in the fresh air streambefore the core. When the outdoor air temperature is measured to be below freezing, a timed defrostcycle is initiated. The machine runs normally for 36 (normal mode) or 20 (arctic mode) minutes and thenshuts off the fresh air by closing a damper for 4 (normal mode) or 5 (arctic mode) minutes. This timedcycle repeats until the temperature of the outdoor air is measured to be above 0 C. Note: When themachine has power but is not turned on the damper automatically closes off the fresh air port to preventunwanted drafts while the machine is not in operation.Change from previous board-versions: When in defrost mode, the fans operate in high-speed. A call from the timer now lasts20 minutes total, even if the machine is in defrost (previous versions would wait until defrost was complete and then resumethe timer).3.2. Machine ON/OFF SwitchSwitch to the ON position " | " to enable operation of the HRV.3.3 Standard Dehumidistat - Part # DSTAT-1With this standard basic control the system is designed to operateon a low speed for continuous ventilation with intermittent highspeed for moisture on air quality control. The dehumidistat willswitch the HRV to high speed when the relative humidity of the airaround it exceeds its set point. When the humidity falls below theset point, the machine drops out of high speed.3.4. Windsor Control (Part # WIN-1)The Windsor Dehumidistat Control incorporates a 3-position switch from which the operator can selectthree operating modes.1. OFF - disables all functions.2. STANDBY - HRV is on stand-by (intermittent). High speed ventilation on demand from thedehumidistat, or remote timers. i.e. Auto-Off3. CONTINUOUS - continuous low speed ventilation. HRV cycles to high speed on demandfrom the dehumidistat or timers.The two position switch:Constant - locks the motors in High speedStandard – normal operating mode enables functions 2 and 3 above.Wires from the control are colour coded as follows: black/HUM, green/INT, yellow/CONT, red/24VCOM. Remove factory installed jumper wire at CONT and 24 V COM. Four-conductor wire is used.3.5. Windsor Timer (WIN-20)Install in bathrooms, kitchens, workstations or other locations where high-speed ventilation control isneeded. The machine will run at high speed for twenty (20) minutes and then return to its normaloperating condition.HUMINT"|CONT"|| 24 VCOMSWITCHLED