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State Industries SW 37-670 Manuel D’Utilisation

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MaIntenance
Boiler maintenance includes periodic tank flushing and cleaning, and 
removal of lime scale from the heating elements.  Circulating pumps 
should be oiled.
MaIntenance schedule
Component
Operation
Interval
Required
Tank
Flushing
Monthly
Sediment 
Removal
As Needed
Elements
Lime Scale 
Removal
As Needed
UN•LIME
®
 
Delimer and 
element gaskets
Circulating Pump(s)
Oiling
Per pump makers instructions
Pressure Relief 
Valve Test
Manually 
Operate
Anually
pressure relIef ValVe test
The pressure relief valve must be manually operated at least once a 
year. Caution should be taken to ensure that (1) no one is in front of 
or around the outlet of the pressure relief valve discharge line, and 
(2) the water manually discharged will not cause any bodily injury or 
property damage because the water may be extremely hot.
To test the relief valve, lift the lever at the end of the valve several times, 
see Figure 2. The valve should seat properly and operate freely.
fIGure 2.
If after manually operating the valve, it fails to completely reset and 
continues  to  release  water,  turn  off  power  to  the  boiler  at  the  main 
disconnect switch or breaker. Close the cold water inlet to the boiler and 
follow the draining instructions in this manual to drain the boiler. Should 
the relief valve need to be replaced, call the toll free phone number 
listed on the back of this manual for further technical assistance.
Tank flushing and circulating pump lubrication should be performed 
in accordance with the above schedule. Tank sediment removal and 
element  lime  scale  removal  must  be  performed  when  needed  as 
determined by period inspections. Following are the instructions for 
performing recommended maintenance.
systeM cleanInG
The  hot  water  system  should  be  internally  cleaned  and  flushed  to 
remove contaminants which may have accumulated during installation. 
System cleaning provides chemical stability necessary for component 
life and system performance.
Failure to clean the system may cause:
1. Poor heating due to formation of gas.
  •  Residential pipe dope, thread cutting oil, solder flux, dirt and other 
foreign materials breakdown to form gas. This is indicated by a 
continuing need for purging even through the system is “closed”.
2. Pump seal leakage.
  •  Acidic water (low pH) and contamination such as soil and sand 
result in premature or recurring pump seal failures.
3. Automatic air valve leakage.
  •  Contaminants cause sticky sealing surfaces and result in leakage.
4. Relief valve operation.
  •  Gas formation increases system pressure and relief valve spillage.
5. Water leaks at joints and fittings.
  •  Corrosion  and  eventual  failure  of  connections  occur  when 
system pH is low.
6. Noisy operation.
  •  Heat transfer surfaces can be fouled with dirty, oily water. This 
plus gas lead to noisy water circulation.
flushInG 
1. Turn off the electrical disconnect switch.
2. Open the boiler drain valve. Allow water to flow to an open drain 
until it runs clean. Do not come in contact with the water being 
drained as it may be very hot.
3. Close the drain valve when finished flushing.
4. Turn on the electrical disconnect switch.
sedIMent reMoVal
Water borne impurities consist of fine particles of soil and sand which 
settle out and form a layer of sediment on the bottom of the tank. In time, 
if not removed, the level of sediment might reach the heating elements.
For convenience, sediment removal and element lime scale removal 
should be performed at the same time as follows:
water and lIMe scale reMoVal
Water and lime scale accumulations on the heating elements is a 
normal condition, common to all immersion type elements. Factors 
which affect the amount of this formation are:
1. Amount of make-up water used.  As the volume of make-up 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  a  lower  heating  element  be  removed 
periodically for examination. If it is scaled, all of the elements should 
be removed and cleaned. If the tank bottom has an accumulation of 
sediment, it should be cleaned.