Technical Documents

12
MAINTENANCE

GENERAL
Once a month the temperature/pressure relief valve should be checked
to ensure that it is in operating condition. Lift the lever at the top of the
valve several times until the valve seats properly and operates freely.
For your safety, water heater service should be performed by a
       

       
and cleaning, and removal of lime scale from the heating elements.
If required by pump manufacturer, water heating system circulating
pumps should be oiled.
Summary of Maintenance Schedule
Component Operation Interval Required
Tank
Flushing Monthly
Sediment
Removal
As Needed
Heat Exchanger Tube Cleaning
Once a year
1 part muriatic
acid to 10 parts
water for 2
hours
Circulating
Pump
Water
Lubricated
Steam Trap Cleaning
Once a year
See Vendor
Literature
Steam Strainer Cleaning
TABLE 3
         
schedule. Tank sediment removal and lime scale removal must be
performed when needed as determined by periodic inspections.
The internal shell should be inspected for any rusting or pitting and
corrected if possible. Maintenance of this nature will provide cleaner

TANK MAINTENANCE
In any water system, the storage water heater acts as a settling
basin for any foreign matter in the water which will deposit itself on
the bottom of the storage section. For this reason it is recommended

The heating coil should be inspected and cleaned of any scale or
mineral deposits that may attach themselves to the heating surface.
The heating surface may be cleaned. Refer to vendor’s heat
exchanger instruction sheet.
FLUSHING
 
 
 
4. Open heating medium valve.
SEDIMENT REMOVAL

settle out and form a layer of sediment on the bottom of the tank.
Sediment accumulation in the tank is a normal condition, common to all
storage tanks. Factors which affect the amount of this formation are:
1. Amount of hot water used. As the volume of water heated
increases, more scale results.
2. Water temperature. As the temperature of the water is increased,
more scale is deposited on the elements.
3. Characteristics of water supply. Regardless of water treatment,
the elements should be examined regularly.
Water scale accumulations may cause noises to occur during operation.
It is recommended that periodic visual checks are made. If the tank
bottom has an accumulation of sediment, it should be cleaned.
SEDIMENT REMOVAL
1. Valve off the heating medium.
2. Drain the hot water generator following DRAINING instructions.