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 the forward and reverse directions. The panel also provides
(b) Remove nuts and washers from
overload and under voltage protection.
threaded post of stationary contact (2) and withdraw contact
from mounting board.
b. Maintenance.
(c) Installation is in reverse order of
(1) Keep control panel inclosure clean and dry.
removal.
(2) Inspect contacts for burning and wear. Dress
(4) To remove resistor-
excessive roughness from copper contacts with a fine file. Do
(a) Remove mounting screw securing
not file silver contacts. Replace contacts.
resistor to mounting board.
(3) Check contact spring tension.
Replace
(b) Disconnect electrical leads to resistor.
springs that have lost tension.
(c) Withdraw resistor from switch housing.
(4) Inspect relay coils for evidence of overheating,
(d) Installation is in reverse order of
check control circuit resistor in series with coils where
removal.
overheating is evidenced. Replace defective resistors and
coils.
e. Assembly.
(5) Check all electrical connections for cleanliness
(1) Assembly is in reverse order of removal.
and tightness. Tighten loose connections and clean dirty
(2) Check each electrical connection for tightness
connections.
prior to replacing the cover on switch assembly.
NOTE
5-68. Control
Overload heater connection resistance is
a General. The control (panel) is installed with the
critical, keep these connections tight.
capstan motor and switch to provide one step armature
(6) Check resistor bank connections. Clean and
shunting and three steps of straight series connections in both
tighten loose or dirty connections.
Section V. HEATING SYSTEM
hour. Controls consist of a stack switch to provide safety
5-69. General
combustion control; a low water cutoff to provide an automatic
The heating unit of the system is a sectional type cast iron
shutdown feature, and an aquastat to control the domestic hot
steam boiler, containing a tankless domestic hot water heater
water when the boiler is not used for heating the vessel.
fired by a burner (fig. 5-110) mounted on the front of the
boiler. This unit is automatic, and is rated at 450,000 btu per
5-151
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