Glow-worm 38cxi Installation And Servicing

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5.9 Water Pressure
The minimum working pressure to obtain the maximum
domestic ow is:-
24cxi 1.0bar
30cxi 1.0bar
38cxi 2.5bar
The maximum working pressure of the domestic hot water
circuit is 10 bar. If the cold water supply pressure exceeds
this, then a pressure-reducing valve must be tted in the
supply to the boiler.
5.10 ‘Hard’ Water Areas
The temperatures within the heat exchanger are limited by
the boiler control system to minimise scale formation within
the hot water pipework. However, in areas where the water is
‘hard’ (i.e. more than 200mg/litre), it is recommended that the
hot water setting is reduced and that a scale reducer is tted,
refer to the manufacturer’s instructions or consult the local
water company for additional advice.
5.11 Domestic Water Flow Rate
The domestic hot water ow has a restrictor, factory tted,
which reduces the ow to a maximum of, 8.0 l/min for 24cxi,
12.0 l/min for 30cxi and 15.5 l/min for 38cxi.
5 Water System - Domestic Hot Water
12253
Diagram 5.2

Glow-worm 38cxi Specifications

General

Model	38cxi
Category	Boiler
Output	38 kW
Efficiency	89.2%
Efficiency Rating	A
ERP Rating	A
Fuel Type	Natural Gas
Mounting	Wall Mounted
Max. Working Pressure	3 bar
Electrical Supply	230V ~ 50Hz
Flow Rate at 35°C Rise	15.7 litres/min
Central Heating Flow Temperature Range	30°C to 80°C
Type	Condensing Combi Boiler
Flow Rate	15.7 litres/min at 35°C rise