18
Mexico Super RS 3/60P - 3/100P -
Installation
22 FROST PROTECTION
INSTALLATION
INST
ALLA
TION
A.
ELECTRICAL INSTALLATION
1.
Checks to ensure electrical safety should be carried
out by a competent person.
2.
ALWAYS carry out preliminary electrical system
checks, i.e. earth continuity, polarity, resistance to
earth and short circuit using a suitable test meter.
B.
GAS INSTALLATION
1.
The whole of the gas installation, including the meter,
MUST be inspected and tested for soundness, and purged
in accordance with the recommendations of BS. 6891.
2.
Purging air from the gas installation may be expedited by
loosening the union on the gas service cock on the boiler
and purging until gas is detected.
3.
Retighten the union and check for gas soundness.
24 COMMISSIONING AND TESTING
6.
Replace the control box cover and refit the control panel using
the screws previously removed.
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 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.
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.
23 FITTING THE CASING
1.
Offer up the RH side panel, locating it with the peg in the
baseplate, and push the panel back.
2.
Secure the panel to the baseplate and collector hood.
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 neartly
secured with the cable straps provided and MUST NOT be
allowed to touch the burner front plate, or the cleanout cover and
the collector hood.
WARNING.
Whilst effecting the required gas soundness test and purging air from the gas installation,
open all windows and doors, extinguish naked lights and
DO NOT SMOKE.
