Nu-Air CEA15-R Operating Instructions Manual

Contents

Nu-Air CEA15-R Operating Instructions Manual Manual pdf 12 page image

Rev. December 19, 2008 Page 12 of 19Up to six (6) timers can be connected in series or parallel. Match terminals on back of switch toterminals on HRV. "SWITCH", "LED" and "24 V COM (PWR)". When engaged, the HRV will run inhigh speed for twenty minutes. Three-conductor wire is needed.3.6 Spring Wound TimersConnect to "HUM" and "24 V COM" using two-conductor wire. To select between continuous lowspeed operation or intermittent high speed when no other control is being used, use a jumper wireconnection as described in 3.2 above.3.7 Remote On/Off SwitchingBasic RNC type control can be achieved using a standard lightswitch. Add a jumper to 24 V COM and CONT forcontinuous low speed. For manually switched high speed,connect a switch between HUM and 24 V COM.Remote On/Off Switching With Internal DehumidistatFor continuous low with automatic humidity control, connect the on/off switch to "CONT" and "24VCOM".3.8 Furnace InterlockTo interlock the furnace blower with the HRV, supply 24 V in and out fromthe furnace controls R & G lines to HRV terminals labeled R&G.NOTE - For a furnace connected to a cooling system: When using the built-infurnace interlock relay on the HRV in conjunction with certain older mercury bulbthermostats, energizing the R and G terminals will also cause 24 volts to be sentthrough the Y terminal which will initiate the outdoor condenser. If this is the case,there are two possible solutions. Either upgrade the thermostat to a digital typewhich does not have Y connected to G internally, or install the isolationrelay as shown in the wiring diagram at right.4. Arctic Defrost ModeA field selectable Arctic Defrost Mode is available on all models andshould be used for temperatures below -20 0C (-4 F) for fanshutdown defrost models and areas with temperatures reachingbelow -30 0C (-22 0F) for damper defrost or recirculation models. Consult Nu-Air Ventilation SystemsInc. or your nearest wholesaler for more information.5. START-UP• Ensure the controls are connected in accordance with Section 3.• For electrical hook-up, plug into a 120 volt receptacle.• Ensure that the machine is piped to an adequate drainage source, i.e. through the drain hosesupplied.IN (R) OUT (G)FURNACE INTERLOCK