Classic HVPA & HVPSA M&S 8.09-1
15700 - 8
HVAC Equipment
with the air flow ((CFM) at various static pressures chart. This chart can be found
in the Classic Product Data Sheet or the Installation Manual. This CFM is referred to
as "C" in the illustration and equation below.
Figure 2. Damper Air Path
b. "A" is the quantity of outside air expressed as a percentage of "C". For example,
if the supply air is 1,220 CFM and 300 CFM of outside air is required, "A" is 25%
(300 CFM/1,220 CFM).
Measure the temperature of the outside air.
Multiply the temperature by "A".
c. "B" is the quantity of return air expressed as a percentage of "C". "A" and "B"
must equal 100%.
Measure the temperature of the indoor return air.
Multiply the temperature of the indoor air by "B".
d. Calculate what the Tmix should be with the desired quantity of outside air.
Measure the actual temperature of Tmix at the inlet to the supply air blower or at
the inlet of the supply air blower.
Adjust the damper blade until the measured value of the Tmix equals the
calculated or desired value of Tmix.
The motorized damper, Configuration B, can be controlled by an optional relay
that allows additional external control with a choice of 24, 120 or 240V coils to
regulate fresh air ventilation in response to a control located remote from the
Classic™ heat pump.
9.
Electrical Supply:
The power supply must have the appropriate voltage, phase, and ampacity for the
