Application Guide

Pressure Dependent VAV Applications with MEP-4002 18 CTE-5202 Applications Guide, AN0912A Rev. H
Other Applications
See the corresponding application in Pressure
Independent VAV Applications with CSP-5001/5002
on page 32 and make the corresponding wiring adjust-
ments for power to the MEP-4xx2 and CTE-5202.
The MEP-4xx2’s default direction is the same as the
CSP-5001.
~
T T
AI1
AO1 AO2
CTE-5202
Thermostat
24 VAC @ 5 VA
~
–
(Phase)
(Neutral)
(5K–10K
Ohm Resistor
between AI1
and Common
for Heating
Mode Only)
NC SPST
Relay
(Override
to Fully
Closed)
MEP-4002
Actuator
24 VAC
Common
Input
Out
Auto and Override (to Fully Closed)
Adding a Normally Closed SPST relay or switch
enables overriding the air ow to fully closed.
(Otherwise the example below is the same as the
conguration in Cooling or Heating on page 17).
The default seing is Auto. When the NC relay
energizes, the thermostat signal is removed from the
actuator’s input. The resulting 0 VDC “signal” on
the actuator’s input overrides the actuator to fully
closed.
NOTE: An override to fully open does not apply
to the MEP-4xx2 in a way that is analogous
to the CSP-5001 as shown in Auto and
Override (to Fully Closed or Fully Open)
on page 34.