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12). Push button locations are ideal in special activity areas, such as, bathroom, or kitchen, where high- --speed exhaust operation is needed for a short period of time. NOTE: The 20 minute timer will not function properly unless ERV/HRV wall control is applied and working correctly. Timing function is internal to electronic circuit board, it is activated by a momentary contact between OC and OL. The I connection is to illuminate the push button. The maximum number of push button timers that can be applied is 5. 60 Minute Adjustable Timer A 60 minute adjustable timer can also be used to override wall control and put HRV into high- --speed operation for a select amount of time. Connect timer in parallel with push button timers, or to ERV/HRV terminals OC and OL. (See Fig. 12.) The 60 minute timer will provide a minimum of 10 minutes, and a maximum of 60 minutes of ventilation at high speed. 3 4 5 I OC OL YELLOW BLACK RED ELECTRONIC CONTROL BOARD J3 J1 6 7 8 9 41 7 52 8 63 9 BLACK – COMMON, (J3--4) YELLOW – INDICATOR, (J3--3) THE WIRES FROM THE SWITCH RED – SWITCH, (J3--5) (OPTIONAL) 60 MINUTE TIMER (OPTIONAL) PUSH BUTTON SWITCHES (5 SWITCHES MAXIMUM) BACK OF PUSH BUTTON SWITCH (OC) BLACK – (J3-4) COMMON TERMINAL STRIP (I) YELLOW – (J3-3) INDICATOR TERMINAL STRIP RED – (J3-5) SWITCH TERMINAL STRIP (OL) A98386 Fig. 12 - --Push Button Timer Wiring Layout 6 BALANCING ERV/HRV Balancing intake and exhaust airflow is very important for proper system operation and optimum performance when applying an ERV/HRV. Unit balancing prevents a positive and/or negative pressure within the home. Balancing the ERV/HRV is done by applying magnehelic gauge and using the balancing dampers at the fresh air intake and stale air exhaust ducts. (See Fig. 13.) 1 12 12 11 1 12 12 11 3 13 33 23 1 12 12 11 1 12 12 11 3 13 33 23 Fresh air flow Balancing Chart Exhaust air flow See Detail A DETAIL A Port with integrated balancing damper Top View A07261 Fig. 13 - --Balancing ERV/HRV Airflow is determined by temporarily connecting a magnehelic gauge to the pressure taps on ERV/HRV. (See Fig. 14.) Balancing chart is located on unit door. A98400 Fig. 14 - --Magnehelic Gauge If supply- --air from outside is greater than exhaust- --air from the house, an imbalance can result over pressurizing the home. If exhaust- --air is greater than supply- --air, combustion appliances may backdraft, bringing exhaust fumes into the house. A balanced condition will ensure optimum performance, provide satisfied customers, and avoid expensive callbacks. Before proceeding with balancing, all windows, doors, and fireplace flues should be tightly closed. No exhaust systems such as range top exhausts, dryer exhaust, fume hoods, bath or roof fans should be in operation. The forced- --air furnace (if used for circulation) should be operating in continuous fan mode for normal operating speed. Balancing Procedure Step 1 — Set the unit to high speed. Make sure that the furnace/air handler blower is ON if the installation is in any way connected to the ductwork of the cold air return. If not, leave furnace/air handler blower OFF. If the outside temperature is below 32_F(0_C), make sure the unit is not running in defrost while balancing. (By waiting 10 minutes after plugging the unit in, you are assured that the unit is not in a defrost cycle.) Step 2 — Magnehelic gauge placement. Place the magnehelic gauge on a level surface and adjust it to zero. Step 3 — Connect tubing from gauge to EXHAUST air flow pressure taps. Be sure to connect the tubes to their appropriate high/low fittings. (See Fig. 13.) If the gauge drops below zero, reverse the tubing connections. NOTE: It is suggested to start with the exhaust air flow reading because the exhaust has typically more restriction than the fresh air, especially in cases of fully ducted installations or source point ventilation. Place the magnehelic gauge upright and level. Record equivalent AIR FLOW of the reading according to the balancing chart. Step 4 — Move tubing to FRESH air flow pressure taps. Adjust the fresh air balancing damper until the fresh air flow is approximately the same as the EXHAUST air flow. If fresh air flow is less than exhaust air flow, then go back and adjust the exhaust balancing damper to equal the fresh air flow. (See Fig. 13.) Step 5 — Secure both dampers thumb screw in place with tape. Step 6 — Record air flow information. Write the required air flow information on a label and stick it near the unit for future reference (date, maximum speed air flows, your name, phone number and business address). NOTE: The unit is considered balanced even if there is a difference of ±10 CFM (or ±5 l/s or 17 m3/h) between the two air flows. Balancing Dampers Balancing dampers (sometimes called butterfly dampers) are located in fresh- --air intake and stale- --air exhaust of the ERV/HRV. (See Fig. 13.) Insulating over these dampers is strongly recommended after balancing is complete to prevent condensation problems. E...

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