Trane UHMB060ACV3VA Installer's Manual page 48

Installer's Guide
h. Allow 5 minutes to pass before attempting to adjust
the 40% manifold pressure. This will insure that
the learning routine is complete and that the heat
rise is stable.
j. Read the 40% manifold pressure.
k. If needed, remove the low heat manifold adjust-
ment cover and adjust to obtain the correct mani-
fold pressure. See Figure 59.
40% (LOW) HEAT ADJUSTMENT: TURN CLOCK-
WISE TO DECREASE MANIFOLD PRESSURE
OR COUNTERCLOCKWISE TO INCREASE
MANIFOLD PRESSURE.
l. Use Manifold Pressure Settings Table 21 for the
correct manifold pressure setting in Inches of Water
Column.
m. Once the 40% manifold pressure has been adjusted;
push the Enter button on the user interface. This
will stop the gas valve setup mode and take you
back to the home screen.
3) Setting "MAX" manifold gas pressure
To enter the Gas Valve Setup mode:
a. Scroll down on the user interface to Unit Test.
b. Scroll to the right and select "Gas Val Setup".
c. Push the Enter button.
d. Scroll to the right and select MAX; then push the
Enter button.
e. Select "MAX" and push the Enter button.
f. When asked "Are You Sure", select Yes, and push
the Enter button.
g. The furnace will now begin another ignition se-
quence.
h. If pressure switch 2 & 3 learning routines have not
been performed; after successful ignition, the
inducer will go through this operation. (see Inducer
Learning Routine section).
i. Allow 5 minutes to pass before attempting to adjust
the 100% manifold pressure. This will insure that
the learning routine is complete and that the heat
rise is stable.
j. Read the 100% manifold pressure.
k. If needed, remove the high heat manifold adjust-
ment cover and adjust to obtain the correct mani-
fold pressure. See Figure 59.
48
100% (HIGH) HEAT ADJUSTMENT:
COUNTERCLOCKWISE TO DECREASE MANI-
FOLD PRESSURE OR CLOCKWISE TO IN-
CREASE MANIFOLD PRESSURE.
l. Use Manifold Pressure Settings Table 22 for the
correct manifold pressure setting in Inches of Water
Column.
m. Replace and tighten the adjustment cover for the
high heat and read the manifold pressure again.
This procedure may need to be repeated until the
correct manifold pressure is obtained.
NOTE: The adjustment cover over the high heat must
be in place during manifold gas pressure readings.
See Figure 53.
n. If the firing rate cannot be obtained with the
manifold pressures specified in Table 22, the orifices
must be changed. If a change of orifices is required
to correct the furnace input rating, refer to Table 17
on page 37.
o. Once the 100% manifold pressure has been ad-
justed; push the Enter button on the user interface.
This will stop the gas valve setup mode and take
you back to the home screen.
▲
WARNING
!
EXPLOSION HAZARD
REPLACE AND/OR TIGHTEN ALL PLUGS REMOVED
OR LOOSENED WHEN ADJUSTING GAS PRESSURE.
LEAK CHECK THE FITTINGS BEFORE PLACING INTO
REGULAR SERVICE.
FAILURE TO FOLLOW THIS WARNING COULD
RESULT IN SERIOUS PERSONAL INJURY,
PROPERTY DAMAGE, OR DEATH.
p. Remove all field supplied tubing and measurement
devices. Reinstall and tighten all covers and outlet
pressure tap screw.
q. Leak test all gas fittings using a leak detection
solution or soap suds.
r. Turn comfort control to home owners desired
temperature.
18-CD30D1-9