VENTILATORS VH30100 - Page 15

BALANCING THE UNIT
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15
IO-VENT-SS
Balancing chart
This balancing chart is based on a Delta P (DP) reading from the
airow measuring device. A copy of this chart is also located on
the access panel of the venlator.
Note: To perform a proper installaon, the External Stac
Pressure (ESP) needs to be measured at each of the 4 staons.
Proceed to measure the Delta P (DP) to determine the cor-
responding airow (e.g. 50 CFM), then repeat unl the unit is
balanced for both the ESP and airows.
*Important: Once balancing is complete, ensure all four
pressure taps are sealed with the rubber caps. Pressure taps
are supplied in the installaon kit.
Pa in. wg L/s CFM L/s CFM
50 0.20 44 93 43 90
62 0.25 41 87 40 85
75 0.30 39 83 37 79
87 0.35 37 79 36 77
100 0.40 35 74 36 76
112 0.45 33 69 34 71
125 0.50 30 65 32 67
137 0.55 29 61 28 60
150 0.60 26 56 24 51
162 0.65 24 50 22 47
175 0.70 22 46 19 41
187 0.75 19 41 17 36
199 0.80 17 36 15 31
Balancing Chart when using collar pressure taps.
Pressure Fresh Air Exhaust Air
8. Perform the same operaon on the stale air side by
selecng the INTER posion on the selector switch.
Adjust the airow rate in the stale air duct to be the
same as the airow rate in the fresh air duct, so the
airow entering and leaving the building is balanced.
9. If necessary, the selector switch can be set to the CONT
posion, which will adjust the speed of both fan motors
at the same me.
10. Once this is done, you have set and locked the high
speed on your venlator and balanced the fresh and
stale airow rates.
11. To exit Balancing mode, press the (+) and (–) buons at
the same me unl the LED turns green, indicang that
the control has returned to Run mode.
Procedure for Setting Low
(Continuous) Ventilation Rate
When the unit is in Run mode, the connuous airow rate
can then be set by using the (+) and (–) buons and reading
the CFM using the airow measuring device.
1. When the unit is in Run mode, the connuous
airow rate can then be set by using the (+) and (–)
buons and reading the CFM using the airow
measuring device.
2. When the selector switch is set to the CONT posion,
the venlator runs at the low (connuous) speed unl
there’s a remote call for venlaon (override) from an
external control such as the VHP Series of controls.
Balancing Reset
Balancing of the venlator is locked upon exing Balancing
Mode and can only be changed with a reset of the control.
To Reset Control
1. Press the (+) and (–) buons simultaneously for 10
seconds. Aer 5 seconds, the LED will turn yellow and
aer 10 seconds, it will turn green
2. Release both buons
3. Unit has now been reset and is ready for re-
balancing, if necessary
Testing the Ventilator to Conrm Operation
1. Apply power to the venlator. Set the selector
switch to the CONT posion. Verify that the unit
turns on and operates at connuous speed
2. Turn the wall control to minimum humidity seng to
create a call for venlaon. Verify that the venlator
turns on and operates at high speed. Return wall
control to normal humidity seng.
3. Repeat for mer control, if one is installed
4. Return the selector switch to the desired posion
(INTER or CONT) and the wall control to the desired
sengs
5. Inspect the ductwork to verify there are no bends,
kinks or obstrucons to airow. Correct as needed.