INSTALLATION
18
Mexico Super CF495 - CF4140
-
Installation & Servicing
21 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 GREY (not the ORGANGE) wire only must be connected to
the live supply.
LEGEND
b
blue
bk
black
Boiler supply connector
Pump
Terminal strip
suitably
enclosed
T
y
pical programmer CH may
be selected independently
MAINS
mex 2133
Pumped only
22 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
y/g
yellow/green
Boiler supply connector
Pump
Terminal strip
suitably
enclosed
T
y
pical programmer CH may
be selected independently
M
A
INS
MEX 2134
E
N
L
23 FROST PROTECTION
br
brown
r
red
w
white
or
orange
gy
grey
y/g
yellow/green
Gravity HW & Pumped CH
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.
INST
ALLA
TION
200944-1.p65
3/8/2004, 3:41 PM
18
