Cor HRVCRSVU1157 Instrukcja instalacji - Strona 13

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BALANCING THE UNIT

What you need to balance the unit

S A magnehelic gauge capable of measuring 0 to 1 inch of water

(0 to 249 Pa) and 2 plastic tubes.

S The balancing chart of the unit.

Fig. 28 - Magnehelic gauge

Preliminary stages to balance the unit

S Seal all the unit ductwork with tape. Close all windows and

doors.

S Turn off all exhaust devices such as range hood, dryer and

bathroom fans.

S Make sure the balancing dampers are fully open by setting both

damper balancing tools completely vertical.

S Make sure all filters are clean (if it is not the first time the unit is

balanced).

Fig. 29 - Damper balancing tool

Balancing procedure

1. Set the unit to high speed.

NOTE: Make sure that the furnace/air handler blower is

ON if the installation is in any way connected to the duct-

work of the cold air return. If not, leave furnace/air handler

blower OFF. If the outside temperature is below 0_C/32_F,

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.)

2. Place the magnehelic gauge on a level surface and adjust it

to zero.

3. Connect tubing from gauge to EXHAUST air flow pressure

taps (the ones with arrows, see insets in illustration beside).

Be sure to connect the tubes to their appropriate high/low

fittings. If the gauge drops below zero, reverse the tubing

connections.

4. Note the CFM value from balancing chart located on unit.

5. Repeat steps 3 and 4, but to FRESH air flow pressure taps.

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6. Match highest CFM value to lowest by adjusting the balan-

cing damper corresponding to the highest value.

7. Secure both dampers in place with a fastening screw (in-

cluded).

8. 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).

NOTES:

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1. Use conversion chart provided with the unit to convert mag-

nehelic gauge readings to equivalent cfm values.

2. The unit is considered balanced even if there is a difference

of 10 cfm (or  5 l/s or 17 m

flows.

Stale air flow

Fresh air flow

Fig. 30 - Balancing procedure

/h) between the two air

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