MARLOW-HUNTER MH31, Operator'S Manual

Page: 164 / 267

Water Systems
9.6
Hotter
3
/
32
" Hex Wrench
Turn
Colder
Unscrew, lift
cap to adjust
Figure 9.13
Hot Water Scald Time (Reference Only)
Temperature/Max duration until injury
155F (68.3C) 1 second
145F (62.9C) 3 seconds
135F (57.2C) 10 seconds
130F (54.4C) 30 seconds
125F (51.6C) 2 minutes
120F (48.8C) 5 minutes
9.4.2 Heat Exchanger
An additional feature of the water heater is its heat
exchanger component. This feature allows the water
heater to perform its job by transferring heat from the
engine’s coolant to the fresh water system. Hoses run
from the engine to the water heater and back to form a
closed loop. This functionality produces a supply of hot
water without the use of shore power.
Refer to Figure 9.17 for the heat exchanger plumbing
layout.
WARNING
! !
Hydrogen gas may form in water heater if not used.
Open valves. Do not smoke or use electrical appli-
ances for several minutes before use.
CAUTION
! !
Ensure the water heater is full before energizing.
Bleed off any air by opening the hot water valve.
Close only when there is a steady flow of water.
This will bleed the hot water system of air. Failure to
follow these instructions could result in damage to
the heating elements in your water heater.
WARNING
! !
Allowing your boat to stay connected to dockside
water supply while unattended could result in a
sunken boat. A major leak or break in the system
could flood the bilges Excess water in the bilges
could flood the batteries and result in your boat
sinking.