17
Mexico Super CF 3/60P - 3/140P -
Installation
INST
ALLA
TION
INSTALLATION
18 TWO SPRING CLOSED VALVES
Notes.
1.
Some earth wires are omitted for clarity. Ensure proper earth continuity
when wiring.
2.
Numbering of terminals on thermostats is specific to the manufacturer.
3.
This is a fully controlled system - set the boiler thermostat to maximum.
4.
'Switchmaster Autozone' has grey and orange auxiliary switch leads
but the orange wire only must be connected to the live supply.
LEGEND
b
blue
bk
black
Pumped only
19 HONEYWELL 'C' PLAN
Notes.
1.
Some earth wires are omitted for clarity. Ensure proper
earth continuity when wiring
2.
Numbering of terminals on thermostats is specific to the
manufacturer.
LEGEND
w
white
r
red
bk
black
br
brown
or
orange
b
blue
gy
grey
g/y
green/yellow
20 FROST PROTECTION
br
brown
r
red
w
white
or
orange
g/y
green/yellow
gy
grey
Diagram A
shows a double pole frost thermostat, which should suffice
for all systems which do not use the OFF terminals of the programmer.
Diagram B
shows a 'change-over' frost thermostat, which will cover
most systems which do use CH OFF. If, however, on such a system
the HW pipework is in an isolated part of the house, a second frost
thermostat may be used to protect it.
If in doubt, ask your installer for advice.
C
entral heating systems fitted wholly inside the house do
not normally require frost protection as the house acts as a
'storage heater' and can normally be left at least 24 hrs.
without frost damage. However, if parts of the pipework run
outside the house or if the boiler will be left off for more
than a day or so then a frost 'stat should be wired into the
system.
This is usually done at the programmer, in which case the
programme selector switches are set to OFF and all other
controls MUST be left in the running position.
The frost 'stat should be sited in a cold place but where it
can sense heat from the system.
Wiring should be as shown, with minimal disturbance to
other wiring of the programmer.
Designation of the terminals will vary, but the programmer
and thermostat manufacturers' leaflets will give full details.
Gravity HW & Pumped CH
Summary of Contents for 4134899
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