26
Mexico Super 4100 FF & 4125 FF -
Installation
INSTALLATION
50 FROST PROTECTION
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.
51 FITTING THE CASING
7. Insert the thermostat phial and phial
retaining clip into the thermostat pocket.
Take care not to kink the thermostat
capillary as it is unwound and secure it
with the split pin as shown.
8. Refit the in-line electrical connector
between the control box and the PCB
box.
9. Refit the grille assembly.
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.
1. Offer up the RH side panel, locating it with the peg
in the baseplate, and push the panel back engaging
it into the collector hood tab.
2. Secure the panel to the baseplate and turret front
panel.
3. Repeat steps 1 and 2 to refit the LH side panel.
4. Place the top panel and push back.
5. Secure the top panel to the side panels.
IMPORTANT. Wiring within the boiler casing must be
neatly secured with the cable straps provided and
MUST NOT be allowed to touch the fan cooling
impellor, the burner front plate, or the cleanout cover
and the collector hood.
6. Replace the control box cover and refit the control
panel using the screws previously removed.
INST
ALLA
TION
