(i) Position the secondary blower cover
assembly (10, fig. 3-10.3) on the motor and secure
with nuts (11). Slide the combustion blower wheel
(12) onto the motor shaft. Adjust the clearance be-
tween the blower wheel and secondary blower cover
assembly as shown in figure 3-10.12, and tighten
the setscrew securely. A 5132-inch allen wrench
makes a good gage for this clearance.
(j) Install air inlet louver (2, fig. 3-10.3) with
four screws (1).
(k) Rotate the blower shaft to make sure that
it rotates freely without scraping or binding.
(l) After assembly, test the blower assembly
to ensure that it will function properly in the heater
assembly. Proceed as follows:
1. The following test equipment is required:
a. DC power supply manually variable
from 18 to 28 volts, with a 15 ampere capacity at 24
b. Three on-off switches.
c. 0 to 30 volt dc voltmeter.
d. 0 to 15 ampere dc ammeter.
e. Stroboscope type tachometer for deter-
mining blower speed.
2. Connect equipment to blower as shown
in test schematic, figure 3-10.13.