Classic HVPA & HVPSA M&S 8.09-1
15700 - 7
HVAC Equipment
2.2 VENTILATION SYSTEM CALIBRATION
Manual Fresh Air System (Configuration N).
This is the standard ventilation
system in the Classic™ heat pump. Fresh air ventilation by means of a damper can
provide up to 15% of rated air flow of outside air. The damper has four positions
corresponding to 0, 5, 10 and 15% of rated air flow of outside air.
The damper only opens when the indoor fan is operating. Position the screw on the
side of the damper hood for the desired air flow.
Manual Damper - 0 to 450 cfm of Outside Air, No Pressure Relief
(Configuration Y)
. The amount of fresh air is determined by the position of the
collar on the rod. To determine the desired quantity of fresh air:
a. With the indoor blower on, measure the quantity of supply air being discharged
into the room with a balometer.
b. Now measure the quantity of the return air from the room. Subtract the return
air from the supply air. The difference is the amount of fresh air.
c. Loosen the set screw that holds the collar onto the rod connected to the damper.
Move the collar and tighten the set screw.
Figure 1. Damper Adjustment
d. Repeat steps a, b and c until the desired amount of fresh air is being introduced
into the room.
Important Note:
Since Configuration Y does not have internal pressure relief,
the fresh air must have a passage to the outside. If a passage is not available, the
desired quantity of fresh air cannot be introduced into the room.
Motorized Damper - 0 to 450 cfm of Outside Air and Pressure Relief
(Configuration B) and the Manual Damper with Pressure Relief
(Configuration Z)
. The settings of the damper require a balometer and a
thermometer for measuring internal and external temperatures.
a. Measure the total supply air with a balometer. If the supply air is controlled by
a manual fan speed controller, make certain that the air flow is in accordance
Rod
Set Screw
