Reznor B5SM Option - Installation - Economizer - Manual (Page 3)

INSTALLATION
INSTRUCTION
INSTALLATION INSTRUCTIONS FOR
560199
ECONOMIZER USED WITH
(B4,B5)SM 090/120 SERIES AIR HANDLER
Figure 4
B. Cool ing Mode, Sin gle Enthalpy Con trol
(Fac tory Stan dard)
The C7400A 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 4 and Figure 5.
C. Heat ing Mode (Heat Pump Ap pli ca tion
ONLY)
1. On a call for heat the fresh air damper will
open to the minimum vent position.
V - Economizer Set Up Pro ce dures
Notice to Installer: Proper operation of this
economizer when used with an outdoor HEAT
PUMP system is dependent on the type
thermostat installed with the unit. Identify which
type thermostat is connected to unit before
making any wiring changes if needed.
Fig ure 5
3
(B4,B5)SM air handler economizers come equipped with Honeywell
W7212 logic modules which offer additional connections for Demand
Control Ventilation (DCV) and Power Exhaust. Contact your local
Honeywell or Tradeline representative for additional information on
these controls and their specific applications