The following table gives the minimum mechanical ventilation rates for the Regency 4
Modulek series range of boilers
INLET AIR
EXTRACT AIR
(Combustion, ventilation)
(ventilation)
Regency 4 Modulek -152
0.21 m
3
/s
0.086 m
3
/s
Regency 4 Modulek -169
0.23 m
3
/s
0.095 m
3
/s
Regency 4 Modulek -186
0.25 m
3
/s
0.105 m
3
/s
Regency 4 Modulek -203
0.28 m
3
/s
0.114 m
3
/s
Regency 4 Modulek -220
0.30 m
3
/s
0.124 m
3
/s
Regency 4 Modulek -237
0.32 m
3
/s
0.134 m
3
/s
Regency 4 Modulek -255
0.35 m
3
/s
0.144 m
3
/s
Regency 4 Modulek -272
0.37 m
3
/s
0.154 m
3
/s
11
GAS CONNECTION
2.5
The gas inlet connection at the rear of the boiler terminates with a male BSP tapered thread.
A gas cock (supplied separately in plastic bag) should be fitted between this point and the gas
supply in an easily accessible position to facilitate servicing.
WATER CONNECTION
2.6
All REGENCY 4 MODULEK series boilers are provided with special flow and return
flanged water connections located at the rear of the boiler. Mating flanges, gaskets and
nut/bolt sets are provided.
In almost all heating and indirect hot water systems there is a need to treat the circulating
water, particularly where the system type is open vented. The fill water will almost always
produce a scale deposit on the waterways of the boiler. This deposit will reduce the heat
transfer capacity of the boiler by insulating the metal of the heat exchanger from the sys-
tem water. Water loss from the system is inevitable even when there is no obvious leakage.
This is caused by surface evaporation from the feed tank. Over a heating season, water
replenishment can be considerable. Make up water will, naturally, contribute to scale for-
mation in the boiler. The rise and fall of water levels through expansion and contraction of
the water on heating and cooling, allows dissolved oxygen to be drawn continuously into
the system promoting corrosion. Corrosion debris can be carried into and laid down in the
boiler increasing the potential for fouling which will severely reduce boiler efficiency and
can lead to premature boiler failure.
It is for this reason that MHS Boilers Ltd., strongly recommends correct treatment of the
system fill water after proper initial system cleansing and flushing.
For specific guidance on water treatment direct contact is advised with:
Fernox
Tandem House
Marlowe Way
Croydon
Surrey CRO 4XS
Telephone: 0870-601 5000
2.6.1
SYSTEM WATER TREATMENT