Domestic Hot Water - Glow-worm Ultrapower 170sxi Installation And Servicing

4
3
2
1
0
General
All domestic hot water circuits, connections, fittings must be
in accordance with the relevant standards and water supply
regulations.
The boilers are suitable for connection to most types of
washing machine and dishwasher appliances.
When connecting to suitable showers, ensure that:
a) The cold water inlet to the boiler is fitted with an
approved anti-vacuum or siphon non-return valve.
b) Hot and cold water supplies to the shower are of equal
pressure.
6.1 Water Pressure Flow Rate
This boiler will operate satisfactorily at low water inlet
pressure. However for optimum performance it is
recommended that 22mm feed pipe is used with an inlet
pressure, at the appliance, of 2bar.
NOTE: Higher pressure can be tolerated as the boiler is
fitted with a pressure reducing valve set a 3.5 bar.
6.2 '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 fitted,
refer to the manufacturer's instructions or consult the local
water company for additional advice.
6.3 Expansion Vessel
The boiler has an integral expansion vessel with a capacity of
12 litres (2.6 gallons), with a charge pressure of 3bar.
NOTE: The expansion vessel volume depends on the total
water system volume and the initial system design pressure.
Supplied By www.heating spares.co Tel. 0161 620 6677
5 Heating System
automatic bypass - closed
automatic bypass - factory setting
automatic bypass - open
0 200 400 600

6 Domestic Hot Water

pump speed 1
800 1000 1200
Volumeflow (Litres/hr)
Guidance on vessel sizing is also given in the current issue of
BS5449 and BS7074 Part 1, for IE refer to the current edition
of I.S.813 "Domestic Gas Installations".
6.4 Draining Point
A draining point is provided at the bottom of the hot water
storage tank located next to the condensate drain, see
diagram 6.1.
6.5 Safety Valve
The safety valve is an integral part of the boiler and it cannot
be adjusted.The pipe from the safety discharge valve must
not discharge above an entrance, window or any type of
public access area.
CONDENSE TRAP
AND
SIPHONIC DRAIN
DRAIN
POINT
14
pump speed 2
1400 1600 1800
Diagram 5.2
SCREW
Diagram 6.1