Lennox EL195DF SERIES User Manual page 14

To Cold End Header Box
1 − Remove thermostat demand and allow unit to
cycle off.
2 − Install a tee in the negative (−) line (red tubing) and a
tee in the positive (+) line (black tubing) running from
the pressure switch to the cold end header box.
3 − Install a manometer with hose from the negative (−)
side of the manometer to the tee installed in the
negative (−) line and with hose from the positive (+)
side of the manometer to the tee in the positive (+)
line.
NOTE − Both sides of the cold end header box are nega-
tive. However the (+) port reads less negative pressure
than the (−) port.
C−Blower Compartment
Blower motor (B3) and capacitor (C4), are located in the
blower compartment. The blower compartment can be ac-
cessed by removing the blower access panel.
Blower Motor Housing
MOTOR
To Remove Blower From Unit: Disconnect Power, Remove
Control Box, Remove Bolts and Unplug Motor Wires From
Integrated Control. Then Slide Out Front of Unit.
FIGURE 12
Measuring Pressure Differential
Red Tubing
(negative −)
Field Provided Tubing
To Pressure Switch
FIGURE 11
BOLTS
CAPACITOR
+"
High
−"
Low
4 − Operate unit and observe manometer reading.
Readings will change as heat exchanger warms.
a. Take one reading immediately after start-up.
b. Take a second reading after unit has reached
steady state (approximately 5 minutes). This will be
the pressure differential.
The pressure differential should be greater
than those listed in table 5.
5 − Remove thermostat demand and allow to cycle off.
6 − Remove manometer and tee's. Reinstall combustion
air sensing hoses to the pressure switch.
1.Blower Motor (B3) and Capacitor (C4)
All EL195DF units use single−phase direct−drive blower mo-
tors. All motors are 120V permanent split capacitor motors
to ensure maximum efficiency. See SPECIFICATIONS table
at the front of this manual for more detail. See motor name-
plate for capacitor ratings.
Page 14
Black Tubing
(positive +)
To Cold End Header Box