Switching The Heater Off; Coolant Heater Timer - PREVOST H3-45 2023 Operator's Manual

operated independently of the heater by means
of an appropriate circuit. The heater can be
switched on at any time (i.e., during the delayed
cut- out period). Ignition takes place after the
delayed cut-out time expires.

SWITCHING THE HEATER OFF

The fuel supply is interrupted when the heater is
switched off. This causes the flame to go out and
a delayed cut- out of 3 minutes begins. The
circulating combustion air flushes the remaining
combustion gases out of the chamber and cools
off the heated parts on the exhaust side of the
heat exchanger. The water circulation pump
continues to transfer the latent heat present in the
heat exchanger, thus preventing hot spots. Once
the delayed cut- out time expires, both the
combustion air blower and the water circulation
pump switch off automatically. A cut- out will
automatically take place in case of heater failure.
Refer to "PRE-HEATING SYSTEM" on page 16
in Section 9, Technical
specifications.

COOLANT HEATER TIMER

The timer, located on L.H. lateral console is used
to program the starting and stopping time of the
preheating system and to give Fault Codes. The
Heater "On" symbol
appears when the system is in operation.
information for
, located on the timer,
PA-1652 Operator's Manual H3-45 Coach
FIGURE 7: FIGURE 1: PREHEATER TIMER
1. Time set
2. Preheat time set
3. Heater "On"
4. Backward scan
5. Forward scan
6. Memory location
7. Time and day display
8. Air temperature display
9. Heater "On" symbol
Refer to the 7 day timer operating instructions
found on your Technical Publications USB flash
drive, and on the Technical Publications Website
for additional information.
TIMER OPERATION
The most common
described. For additional details, refer to the
day timer operating instructions
Technical Publications USB flash drive, and on
the Technical Publications Website.
Other Features 5-17
timer operations are
7
found on your