Reznor R6GF Option - Installation - Economizer - Light Commercial - Manual (Page 8)

OP ER A TION
A. Cool ing Mode
1. On a call for cooling, with ambient temperature and
humidity above enthalpy control setpoint, damper
will open to minimum vent position only.
2. On a call for cooling, with ambient temperature and
humidity suitable for cooling, enthalpy control will
shift stage one control to outside air and shift stage
two thermostat to first stage compressor. Damper
will modulate to control supply air temperature at
55°F (13°C). If additional cooling is required,
compressor one may be energized through second
stage of thermostat.
B. Heat ing Mode
1. On a call for heat damper will open to the minimum
vent position only.
C. Out door Enthalpy Change over Setpoint
The out door enthalpy change over setpoint is used to
re
turn the out door air damper to minimum po si tion
when enthalpy rises above setpoint. Enthalpy setpoint
scale mark ings lo cated on W7459, are A, B, C and D;
See Figure 1 for corresponding control point. The
factory-installed 620 ohm jumper must be in place
across terminals S
R
and +.
SET TINGS AND AD JUST MENTS
Potentiometers with screwdriver adjustment slots,
located on the face of the W7459 economizer control
device, provide adjustments for the minimum damper
INSTALLATION
INSTRUCTION
Figure 1
DOWNFLOW ECONOMIZER # 558870
PACKAGE EQUIPMENT MODELS
*R6G(D,F) 024*–060* / *R8GD 036*-060*
*P6SD 024*-060* / *Q6SD 024*-060*
C7150B Air Temperature Sensors
resistance versus temperature.
C7400A Sensor output current
vs. relative humidity
7