PVI Industries Water Heater PV500 24 User Manual

INSTALLATION & MAINTENANCE MANUAL FOR  
QuickDrawâ  
INSTANTANEOUS  
ENERGY: WATER TO WATER  
U-TUBE SINGLE-WALL & DOUBLE-WALL HEAT EXCHANGERS  
TYPICAL CONSTRUCTION  
FIGURE 24-1  
1. U-tube Heat Exchanger  
2. Boiler Water Inlet  
3. Boiler Water Pump  
4. Control Enclosure  
5. Intratank Circulator  
6. Potable Water Inlet  
7. Potable Water Outlet  
8. Tank Drain  
9. Boiler Water Temperature Gauge *  
10. Tridicator *  
11. Flow Switch *  
12. Relief Valve (AGA optional)  
13. Tank Purge Valve *  
14. Boiler Water Outlet  
15. Check Valve  
* Optional  
CAUTION: TEMPERATURES HIGHER THAN 125°F. INCREASE THE RISK OF SCALD INJURY!  
IMPORTANT: Clearances for servicing and inspection are 18” at top, sides and rear and a  
minimum of one tank diameter in front.  
PV500-24 03-99  
1
Section 24  
 
QuickDrawâ  
WATER WITH SINGLE-WALL / DOUBLE-WALL (con't)  
ELECTRICAL  
The heater is wired for 120 volts and must be electrically grounded in accordance with local  
codes, or in the absence of local codes, with the latest edition of the National Electrical Code  
ANSI/NFPA. When unit is installed in Canada, it must conform to the CSA C22.1, Canadian  
Electrical Code, Part 1 and/or local electrical codes.  
1. Water must be pumped continuously  
through the boiler when it is being fired.  
3. All wiring must be in accordance with all  
local, state, or federal codes.  
2. Do not energize water heater or pumps  
until tank is full of water. Serious  
damage may result.  
4. Provide proper overload protection for  
the system's circulating pumps.  
NOTE: Use only copper wire of proper sizing for incoming service. Damage  
resulting from use of aluminum wiring will be excluded from coverage under  
the warranty of this unit.  
RELIEF VALVE PIPING  
The water heater is supplied with a  
pressure and temperature relief valve, sized  
in accordance with ASME requirements.  
Each relief valve should be piped to a  
suitable floor drain. No reducing coupling or  
other restriction can be installed in the  
discharge line.  
MAINTENANCE  
more rapidly. Other factors affecting the  
scale buildup are the amount of hot  
water used and the temperature of the  
water. The more hot water used, the  
more fresh water containing the scale-  
forming chemicals is brought into the  
tank. As the temperature of the water  
increases, the rate of scale deposited  
will be increased. The unit should be  
inspected and cleaned as required by  
local water conditions.  
1. A preventive maintenance program  
should be established to assure a long,  
trouble-free life for the water heater.  
2. Scale will normally form in the tank  
during operation and will accumulate on  
the bottom of the tank. The scale is  
formed from the natural chemicals in the  
water that precipitate out during the  
heating cycles. Some water supplies  
contain more of these chemicals than  
others, and the scale buildup will occur  
PV500-24 03-99  
3
Section 24  
 
QuickDrawâ  
WATER WITH SINGLE-WALL / DOUBLE-WALL (con't)  
3. The temperature limiting device and  
WARNING: Make sure valve is piped to a  
proper drain per instructions. Scalding  
injury and/or water damage can occur  
from either the manual lifting of the lever  
or the normal operation of valve if it is  
not piped to a proper drain. Insure that  
the safety relief valve piping is of the  
proper material and rating for the  
temperature and pressure of the system  
and that it is secured to prevent possible  
injury. If valve fails to flow water or  
reseat, consult the factory.  
thermostat sensors that extend into the  
water in the tank may become coated  
with scale, depending on the type of  
water in your area. This coating will  
affect the accuracy of the sensors and  
can allow the water temperature to  
exceed the desired limits. They should  
be removed from the tank and inspected  
at intervals. Remove scale if present.  
CAUTION: On control systems using 120  
volt external power, be certain switch  
is off, and power disconnected to  
avoid electrical shock before work is  
performed on this heater.  
CAUTION: The relief valve is a primary  
safety device.  
Since PVI cannot control the use of the water heater, water conditions, or maintenance,  
the warranty on the water heater does not cover poor performance, structural failure, or  
leaking due to an excessive accumulation of scale.  
PV500-24 03-99  
4
Section 24  
 

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