14
Classic
LXRS, RS
-
Propane Installation
INSTALLATION
INST
ALLA
TION
20 MID POSITION VALVE
Notes.
Pumped only
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 'Midi' is similar in operation but the wiring differs
slightly; see manufacturer's literature.
21 TWO SPRING CLOSED VALVES
Notes.
Pumped only
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 valve has grey and orange auxiliary switch leads but
the grey wire must be connected to the live supply.
Central 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 manufacturer's leaflets will give full details. Diagram A
shows a double pole frost 'stat, which should suffice for all systems
which do not use the 'OFF' terminals of the programmer. Diagram B
shows a 'change-over' frost 'stat, 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 'stat
may be used to protect it. If in doubt, ask your installer for advice.
22 HONEYWELL 'C' PLAN
Notes.
Gravity HW & Pumped CH
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
bk
-
black
br
-
brown
or
-
orange
b
-
blue
gy
-
grey
g
-
green
r
-
red
y
-
yellow
LEGEND
b
blue
r
red
bk
black
br
brown
gy
grey
g/y
green/yellow
or
orange
w
white
LEGEND
b
blue
bk
black
br
brown
r
red
y
yellow
w
white
pk
pink
or
orange
v
violet
g/y
green/yellow
23 FROST PROTECTION
