Reznor R6GP Option - Installation - Economizer - Lt Commercial - Manual (Page 5)

5
INSTALLATION
INSTRUCTION
INSTALLATION INSTRUCTIONS FOR
559374
ECONOMIZERS USED WITH Q5SN / Q6SP 090-120
P6 / R6 120 UNITS
Op tional Ap pli ca tions
Re mote Min i mum Po si tion Con trol
Remote control of outdoor air dampers is desirable when
potential exists for temporary additional ventilation. The
potentiometer in W7459 controls damper minimum
p o s i t i o n . Ad d i n g S 9 6 3 B 1 1 2 8 R e m o te M a n u a l
Potentiometer allows occupants to open dampers beyond
minimum position for additional ventilation. Connect
potentiometer as shown in Figure 7.
Figure 7
S963B1128 Remote Minimum Position Potentiometer
used with W7459 for remote damper control.
Ad just ing Min i mum Damper Po si tion
The minimum position potentiometer keeps outdoor air
damper from closing completely during system operation
to provide ventilation.
Min i mum Po si tion Ad just ment
W7459A
1. Disconnect mixed air sensor from terminals T and T1.
2. Make sure either factory-installed jumper is in place
across terminals P and P1 or if remote damper
positioner is required, that it is wired according to
Figure 7 and turned fully clockwise.
3. Connect 24 Vac across terminals TR and TR1.
4. Adjust potentiometer on face of W7459 with
screwdriver to desired minimum position.
This chart can also be used for measuring the percentage
of outside air on an air handler. The same three
temperatures are measured per the formulas on the
preceding page. Lines are drawn on the chart using a ruler.
As with the formulas this chart is most effective if there is at
least a 10 degree F difference between the return and
outside air. This will typically require either a warm or cold
day rather than moderate weather. It is more accurate to
measure outside air percentage on a day when the outside
temperature is 10°F (-12°C) rather than on a day when it is
70°F (21°C). If the temperature difference between the
return and outside air is only a few degrees, a small error in
measurements can alter the results by as much as 50%
using this method. If the temperature difference is 40 or
50°F (22 or 28°C) small errors in measurement do not
substantially affect the results of the calculations. A full
size chart is provided on the last page of these
instructions.
For detailed instructions on the use of this
chart, refer to Honeywell publication #
63-8594, Honeywell Economizers. Pages
12-13.
For design requirements for CFM per person for all building types, refer to ASHRAE standard 62.1 section 6 and/or local or
state building codes.
Re turn Air
Tem per a ture
% of
Re turn Air
Out side Air
Tem per a ture
% of
Out side Air
Tem per a ture
of Mixed Air
+ x x =
Formula for Adjusting the Minimum Position Control