Enviro Series D User Manual

ENVIRO-TEC
22
FORM ET115.24-NOM11 (118)
DIFFERENTIAL AIR PRESSURE SWITCH
General information
This accessory is a dierential pressure switch with
a normally-open (NO) dry contact that is factory
calibrated to close at a dierential pressure of 0.15
inches of water or greater. The switch measures the
pressure dierential between the unit’s fan section and
the environmental pressure outside the unit. When the
lter is suciently clogged or dirty, dierential pressure
will rise and the switch will close.
Technical specications
Electrical
Initial resistance <500mW
Rating
3.15ma @ 125VAC
10-20ma @ 5-24VDC
Adjustable set point ranges in H
2
O
Ranges
In H
2
O
Min. Max. Proof
0.10 0.50 5.0
Functional
Operating positing
Diaphragm vertical, barbed
ttings horizontal
Operating temp.
-40 °F to 140 °F
(-40 °C to 60 °C)
General measurements: Pressure Switch
Figure 11
Installation
Assembly
The dierential air pressure switch is mounted inside
the unit with double sided tape behind the lter retention
tab. (See gure 12a). Instructions for commissioning or
replacing the dierential air pressure switch:
a. Disconnect main power on the unit.
b. Secure dierential air pressure switch on the lter
retention tab using double sided tape. Position
the pressure port (marked with “+”) outside the
chassis exposed to the environment. The vacuum
port should extend inside the chassis and be open
to the unit’s fan section. (See gure 12b.)
c. Wire the NO relay using .187 quick connectors.
d. Verify all connections before reconnecting main
power.
Figure 12a
Figure 12b

Enviro Series D Specifications

General

Brand	Enviro
Model	Series D
Category	Fan
Language	English