Reznor R6GP Option - Installation - Economizer - Lt Commercial - Manual (Page 4)

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.
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.
Figure 6
Set ting the Out door Enthalpy Change over
Point
The enthalpy control senses both temperature and
humidity or the heat content of the outside air. It controls
the amount of outdoor air brought into the system. When
the heat content of the outside air is below control setpoint,
the control modulates outdoor dampers to meet cooling
needs of the building. When the heat content rises above
control setpoint, the control closes outdoor dampers to
minimum position. The recommended setpoint is “A”. If
Economizer is allowing air which is too warm or too humid
to enter the system, control may be changed to a lower
setpoint (B, C, or D). Refer to Figure 6.
Differential Enthalpy Settings
For units equipped with a differential enthalpy sensor, refer
to the instructions include in the 920233 accessory kit.
INSTALLATION
INSTRUCTION
INSTALLATION INSTRUCTIONS FOR
559374
ECONOMIZERS USED WITH Q5SN / Q6SP 090-120
P6 / R6 120 UNITS
4