15
Mexico Super RS 3/60P - 3/100P -
Installation
INSTALLATION
INST
ALLA
TION
13 MINIMUM REQUIREMENTS
Fully pumped systems
1.
Open vent and cold feed connections must be made to the boiler flow and
return tappings according to the options shown in Frame 6.
2.
The boiler is assumed to be the highest point of the circulating system.
3.
The circulating pump is positioned on the FLOW and the vertical distance,
between the pump and feed/ expansion tank, must comply with the pump
manufacturer's minimum requirements, to avoid cavitation. Should these
conditions not apply, either lower the pump position or raise the feed/
expansion tank above the minimum requirements of
Caradon Plumbing Ltd.
4.
The water velocity through the boiler flow / return pipes is assumed to be
below 1 m/s (3 ft./s), whilst the pump flow rate is set to provide a temperature
difference of 11
o
C (20
o
F) across the boiler flow / return, at design input.
5.
This information is intended as a GUlDE ONLY and cannot take into account
instantaneous changes in head caused by the operation of motorised valves,
pumps etc.
Due allowance MUST be made if surging is liable to occur.
If in any doubt, contact
Caradon Plumbing Ltd.
14 GRAVITY HOT WATER & PUMPED CENTRAL HEATING
1.
Separate flow and return connections are used for each service. All
possible configurations are given in Frame 6 and
ONLY those shown
should be used.
2.
The schematic pipework graph is based on the assumption that NO
MORE than 8 elbows are used in the gravity loop, including entry to the
boiler.
3.
For each extra elbow in excess of 8 (R) MUST be reduced by 300 mm
(12") or (H) increased by 100 mm (4")
4.
Whatever value is selected for (R), the value of (H) MUST be at least
that indicated by the graph.
(R)
=
the horizontal distance between the centre line of the cylinder and
the boiler tappings used - measured along the pipe run.
(H)
=
the vertical distance between the top of the boiler and the base of
the cylinder.
Notes.
a.
Flow and return pipes should rise vertically on leaving the boiler.
b.
Horizontal pipes should be ABOVE ceiling level and as short as possible.
c.
A MINIMUM inclination of 25 mm per 3 m run (1" per 10') is required to
avoid air locks.
If the above conditions cannot be met pumped primaries should be used.
WARNING
The appliance MUST be efficiently earthed.
A mains supply of 230 V ~ 50 Hz . Fuse should be 3A.
All external controls and wiring MUST be suitable for mains
voltage.
Wiring should be in 3-core PVC insulated cable NOT LESS than
0.75 mm
2
(24 x 0.2 mm) to BS.6500, Table 16.
Wiring external to the boiler MUST be in accordance with
current l.E.E. (BS7671) Wiring Regulations and local regulations.
15 ELECTRICAL CONNECTIONS
Connection must be made in a way that allows complete
isolation of the electrical supply - such as a double pole switch,
having a 3mm (1/8") contact separation in both poles, or a plug
and socket serving only the boiler and system controls.
The means of isolation must be accessible to the user after
installation.
This connection should be readily accessible and be made
adjacent to the boiler (except in the case of bathroom
installations for domestic boilers where the point of connection
to the mains MUST be outside of the bathroom.)
