A.O. Smith SGS - 100, Installation, User And Service Manual

Page: 59 / 121

Filling
56 Instruction manual SGS
5
gis
7. The water heater is now under water supply pressure. There should now be
no water coming out of the inlet combination expansion valve or (if used) out
of the T&P valve (3). If there is, the cause might be:
-
The water supply pressure is greater than the specified
value (3.4.2 "General and electrical specifications").
Rectify this by fitting a pressure reducing valve (1).
- The expansion valve in the protected cold supply set-up is defective or
incorrectly fitted.
5.2 Filling vented
installations To fill the water heater, proceed as follows:
1. Open the stop valve (11) in the hot water pipe and, if present, the stop valves
(4) for the circulation pump (6).
2. Close the drain valve (9).
3. Open the nearest hot water draw-off point (14).
4. Open the stop valve (4) on the cold water side (A) so that cold water flows
into the water heater.
5. Completely fill the water heater. When a full water jet flows from the nearest
draw-off point, the water heater is full.
6. Bleed the entire installation of air, for example by opening all draw-off points.
7. The water heater is now under water supply pressure. There should now be
no water coming out of the inlet combination expansion valve or (if used) out
of the T&P valve (3). If there is, the cause might be:
-
The water supply pressure is greater than the specified
value (3.4.2 "General and electrical specifications").
Rectify this by fitting a pressure reducing valve (1).
- The expansion valve in the protected cold supply set-up is defective or
incorrectly fitted.
5.3 Filling solar heating
system
Note
No special safety measures are required when working with the diluted
glycol solution specified by the manufacturer. For more information about the
fluid, please contact the manufacturer.
Note
The filling procedure described in this manual is intended for the pump
system supplied by the supplier of the appliance. For any other system, you
should follow the procedure for that system.
Warning
Before filling the solar heating system to replenish the heating fluid, make
certain that:
•
The appliance is switched off (10.2 "Decommissioning the water heater for
a short period").
• The solar heating system is switched off. Refer to the documentation of the
solar heating system.
• The appliance has cooled down sufficiently to prevent personal injury
(burns).