M A J O R A P P L I A N C E S & A C C E S S O R I E S
4-24
Pressure-Relief Valve
The relief valve (Figure 4-16, upper half) for over-pressure and over-temperature conditions is located on the
exterior of the water heater. This valve will operate if the water temperature reaches or exceeds 210
°
F or if the
water pressure reaches or exceeds 150 psig. Since the water system in the motor home is a closed system when
all water valves are shut, the water-heating cycle can raise the temperature (and, consequently, the pressure) of
the water in the water heater; thereby realizing pressure increases approaching 150 psig. Should this pressure be
reached, the pressure-relief valve will begin “weeping,” that is, minor dripping or leakage from that valve until
the pressure drops below 150 psig, at which time the pressure-relief valve will re-seat itself and restrict the water
flow. This is normal operation and should not be a cause for alarm. Do not obstruct or block the pressure-
relief valve in any way, as this would keep the valve from functioning normally and protecting the hot water
system.
Hydro-Hot Heating System
(Optional)
Depending on what model your Allegro Bus is, it may feature a Hydro-Hot heating system (Figure 4-18) that
provides a continuous, on-demand supply of domestic hot water, as
interior zone heating where and when it is needed. Both heating features
are accomplished by a unique VDC-Powered Diesel-Fired Burner and a
VAC-Powered Electric Heating Element (120 VAC). These two heating
sources maintain the temperature of the Hydro-Hot’s solution of water
and antifreeze.
To activate the optional Hydro-Hot heating system, the hydro-hot switch
(labeled “diesel burner switch”) located in the side cabinet above the
driver’s seat must be activated. By activating this switch, a supply of hot
water as well as interior heat can be provided. The heating feature will be
controlled by the thermostat mounted on the wall. It is operated off the
furnace function of the thermostat to provide interior heat. Hot water will be supplied instantaneously and
continuously at any time the diesel burner switch is activated.
If interior heat and hot water are demanded from the Hydro-Hot system at the same time, hot water will
simultaneously take precedence over interior heat; therefore causing the interior heat to shut down and turn off
until the water flow is turned off from water sources.
Also featured in the Hydro-Hot
system is an electrical burner
switch. With this switch
activated and shore power
available, it will supply a very
limited amount of hot water
and some interior heat.
The surge tank (Figure 4-19),
located in the basement, should
be routinely inspected to make sure
Figure 4-18. Hydraunic Heating
System
Figure 4-20. Control Panel
Figure 4-19. Surge Tank
Summary of Contents for Allegro Bus 2011
Page 8: ...G E N E R A L I N F O R M A T I O N 1 1 GENERAL INFORMATION Chapter 1 ...
Page 15: ......
Page 16: ...D R I V I N G S A F E T Y I N S T R U C T I O N S 2 1 Driving Safety Instructions Chapter 2 ...
Page 27: ......
Page 28: ...H E A T I N G A I R C O N D I T I O N I N G 3 1 Heating Air Conditioning Chapter 3 ...
Page 37: ......
Page 68: ......
Page 69: ...C A B I N E T S F U R N I T U R E 5 1 Cabinets Furniture Chapter 5 ...
Page 74: ......
Page 75: ...S T R U C T U R A L F E A T U R E S 6 1 Structural Features Chapter 6 ...
Page 77: ......
Page 78: ...E L E C T R I C A L F E A T U R E S 7 1 Electrical Features Chapter 7 ...
Page 94: ......
Page 95: ...S L I D E O U T F E A T U R E S 8 1 Slide Out Features Chapter 8 ...
Page 99: ......
Page 100: ...E X T E R I O R F E A T U R E S 9 1 Exterior Features Chapter 9 ...
Page 107: ......
Page 108: ...I N T E R I O R F E A T U R E S 10 1 Interior Features Chapter 10 ...
Page 112: ......
Page 113: ...P L U M B I N G B A T H F E A T U R E S 11 1 Plumbing Bath Fixtures Chapter 11 ...
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Page 127: ...C O N S T R U C T I O N F E A T U R E S 12 1 Construction Features Chapter 12 ...
Page 129: ......
Page 130: ...W I N D O W S A W N I N G S V E N T S D O O R S 13 1 Windows Awnings Vents Doors Chapter 13 ...
Page 136: ......
Page 137: ...R O U T I N E M A I N T E N A N C E 14 1 Routine Maintenance Chapter 14 ...
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Page 180: ...M A I N T E N A N C E D A T A C H A R T S 15 1 Maintenance Data Charts Chapter 15 ...
Page 189: ...M A I N T E N A N C E D A T A C H A R T S 15 10 ...