5
3.3 Hot-water cylinder connections
The use of a Surrey flange (see fig. 2) is recommended to ensure
a free-flowing supply of air-free hot water. An Essex flange is
recommended for STP 3.0 B, SSP 3.0 B, STP 4.0 B, STN 3.0 B,
SSN 3.0 B and STN 4.0 B pumps.
It is not recommended that the hot-water supply is taken directly
from the top of the hot-water cylinder, as entrapped air may cause
problems.
22 mm pipe should be used to ensure an adequate flow to the
pump. Where high flows are expected, 28 mm is recommended.
3.4 Cold-water supply
The cold-water supply to the pump must be connected using
22 mm pipe to the cold-water storage tank. See fig. 2. The tank
connector should be positioned at least 25 mm (1") lower than the
cold-water supply to the hot-water cylinder to prevent the supply
of hot water only.
3.5 Connecting the pump
For ease of installation, subsequent servicing and cleaning of
strainers, full-bore isolating gate valves must be fitted in the
pump suction and discharge ports.
The flexible hoses supplied with the pump must be used for
connecting the pump to the pipework. Use of these hoses will
ensure strain- and vibration-free watertight connections. The
maximum bend angle should not exceed 45 °.
After initial installation, run the pump for a few minutes, switch off,
drain down and clean the suction strainers.
For SSN, SSP, STN and STP pumps, remove the suction hose
from the pump, and the strainer basket can be removed by hand
or with long-nosed pliers.
Line up the pipework, and fit hoses to the pump before
connecting to pipes. Position pipework accurately so that the
pump is not subject to mechanical strain.
Plastic nuts should be finger-tight plus 1/4 turn. The nuts should
be retightened after hot water has been pumped for the first time.
3.6 STC, STR, SSR, STL and SSL pumps
The strainers supplied with the pump must be fitted to the pump
suction connections. See fig. 1.
• Fit the plain hose washer to the discharge connection.
• Fit the strainer to the suction connection with the wire dome
towards pump.
Fig. 1 Fitting the strainer
Do not use any jointing compounds.
Do not connect the pump directly to the water
mains supply.
Do not use any jointing compounds or tape.
Do not use any jointing compounds or tape.
Isolating valves greatly assist draining down,
strainer cleaning and refilling, which will result in
much lower service costs.
Do not bend hoses as this will cause restriction
of flow.
TM04 6989 1310
Discharge
Suction
Plain hose
washer
Wire dome
Grundfos.bk Page 5 Thursday, April 22, 2010 10:28 AM
To Next Page
Loading...
Need help?
General
