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 temperature by controlling the heating unit. The thermostat is
(until stack switch thermostatic element cools). This test
mounted on the bulkhead of the crews quarters.
indicates that power failure feature is operative.
(2) Removal.
When replacement of unit is
(3) Maintenance and adjustment.
necessary, remove cover by loosening screw at bottom of
(a) After 6 months operation remove stack
cover.
Disconnect electrical lead wires and tag for
switch and clean soot from exterior of thermostatic element.
reassembly. Remove mounting screws and lift thermometer
(b) Remove cover and inspect contacts;
from bulkhead.
clean dirty contacts by drawing a piece of crocus cloth
between them.
(3) Installation.
Install by reversing removal
procedures.
(4) Removal.
(a) Disconnect electrical connections; mark
g. Maintenance and Adjustments.
for installation.
(1) Burner. Need for adjustment is indicated by a
(b) Loosen conduit clamp and withdraw
rumbling or pulsating sound, or smokey stack gases. To
cable.
adjust the burner:
(c) Remove rounting screws and withdraw
(a) Set air inlet shutter (32, fig. 5-111) to
switch assembly from smoke pipe.
one-half open mark.
(5) Installation.
(b) View flame through the observation
(a) Place stack switch in position on smoke
door on front of boiler, and adjust the air shutter until the
pipe; fasten with mounting screws.
flame is light orange in color.
(b) Inspect electrical cable through conduit
(c) If flame is proper color and the burner
clamp and tube. Tighten clamp.
still smokes, a dirty or clogged nozzle is indicated. Remove
(c) Connect electrical wiring and tighten
burner and clean nozzle (b. above).
securely.
(2) Fuel filter. Once a month during continuos
(d) If new switch assembly is installed
operation, remove and clean the fuel filter as follows:
carry out test procedure in (2) above.
(a) Remove nut (fig. 5-110) from top of the
e. Aquastat.
fuel oil filter.
(b) Lower bottom (bowl) of filter, then lift
(1) General. The aquastat controls the firing of
out the filter element.
the boiler during summer months when the boiler is being
(c) Clean the filter element thoroughly in
used only for heating domestic hot water.
clean fuel oil, then blow dry with low pressure air.
(2) Maintenance and adjustment.
To adjust
(d) Assemble the filter by placing a new
aquastat to provide hot water at desired temperature, turn
gasket on bowl, then reversing the order of removal in (a) and
adjusting setscrew clockwise to raise and counterclockwise to
(b) above.
lower temperature.
NOTE
f. Thermostat.
(1) General.
The
thermostat
maintains
Replace the filter element at least once
temperature of crew's quarters at an even and comfortable
annually.
Section VI. VENTILATING SYSTEM
5-71. General
5-72. Centrifugal Blower Assembly
The five ventilating blower units of the system supply and
a.
General. The centrifugal blowers (figure 5-112)
have differing air displacement requirements of from 1,050 to
Four of the units (para. 5-72) are of the centrifugal type, while
1,600 cfm, and the motor power varies from 1/2 to 3 1/2 hp,
the fifth (para 5-74) is an axial type unit. Maintenance for the
depending on their location and duty.
units are similar, except for the controller (s), covered in the
applicable paragraph.
5-155
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