IDEAL INDUSTRIES HE12, HE9, HE18 Electrical Supply, Open Vent System Requirements Fully Pumped

GENERAL

Central heating systems controls should be installed to ensure the boiler is switched off when there is no demand for heating or hot water.

When thermostatic radiator valves are used, the space heating temperature control over a living / dining area or hallway having a heating requirement of at least 10% of the boiler heat output should be achieved using a room thermostat, whilst other rooms are individually controlled by thermostatic radiator valves. However, if the system employs thermostatic radiator valves on all radiators, or two port valves without end switches, then a bypass circuit must be fitted with an automatic bypass valve to ensure a flow of water should all valves be in the closed position.

ELECTRICAL SUPPLY

WARNING. The appliance MUST be efficiently earthed. Wiring external to the appliance MUST be in accordance with the current I.E.E. (BS.7671) Wiring Regulations and any local regulations which apply. For Ireland reference should be made to the current ETCI rules for electrical installations.

The point of connection to the mains should be readily accessible and adjacent to the boiler, except that for bathroom installations; the point of connection to the mains MUST be situated outside of the bathroom.

Note.

Where a room sealed appliance is installed in a room containing a bath or shower then the appliance and any electrical switch or appliance control utilising mains electricity should be so situated that it cannot be touched by a person using the bath or shower. See Frame 41 for details.

CONDENSATE DRAIN Refer to Frames 38, 39 and 40

A condensate drain siphon is provided on the boiler. This drain must be connected to a drainage point on site. All pipework and fittings in the condensate drainage system MUST be made of plastic- no other materials may be used.

IMPORTANT.

Any external runs must be insulated.

The drain outlet on the boiler is standard 21.5mm (3/4") overflow pipe.

3 OPEN VENT SYSTEM REQUIREMENTS - FULLY PUMPED

The system should be vented directly off the boiler flow pipe, as close to the boiler as possible. The cold feed entry should be inverted and MUST be positioned between the pump and the vent, and not more than 150mm (6") away from the vent connection.

There should be a minimum height - 450mm (173/4") - of open vent above cistern water level. If this is impossible refer below.

The vertical distance between the highest point of the system and the feed/ expansion cistern water level MUST not be less than 450mm (173/4").

The pump MUST be fitted on the flow side of the boiler.

A suitable pump is a domestic circulator capable of providing an 11oC (20oF) temperature differential (e.g. Grundfos UPS 15/50 or equivalent). The vertical distance between the pump and feed/expansion cistern MUST comply with the pump manufacturers minimum requirements to avoid cavitation. Should these conditions not apply, either lower the pump position or raise the cistern above the minimum requirement specified by Ideal Stelrad Group.

Note. A cold water feed must be available back to the boiler, when all automatic valves are in the closed position (refer to BS. 6798) and when close coupled the feed must not be in a vertical leg.

Feed / expansion	450 (173/4")
cistern	Mimimum

Water level (cold)

450 (173/4")

Mimimum

22mm 15mm

Open ventCold feed

		150 (6")
System		Max
return
		System
		flow to
	Connections	pump
	to boiler	Inverted cold
		feed entry

cla7840

4	LOW HEAD INSTALLATIONS			Minimum Requirements
The classic HE range of boilers can be installed in low head
situations by fitting a 'surge arrester' in the expansion pipe as
shown.				75 (3)
The following conditions MUST be observed:
				Min.		Feed / expansion Cold
1.	The surge arrester must be at least 42mm in diameter x
	150mm long, thus ensuring a MINIMUM air gap and a					cistern		water
			450					level
	MINIMUM depth of water below the static water level (cold)
			(173/4")		Surge
	of 75mm.		Min.	200	arrester
2. The static water level (cold) must be at least 200mm
				(8)	75 (3) Min.
	above the top of the horizontal flow pipe, fitted as shown.		Return	Min.		22 (3/4)
	The vent connection MUST NOT be made immediately off				Flow	Open vent		To pump
	the top of the boiler, as venting is made less efficient.
3.	The maximum practical length of 15mm cold feed pipe				Highest	150
	should be used in order to reduce the effective volume of					(6)
					point of
	system water expanding into the feed/expansion cistern to					Max
					flow or
	a minimum.		cla7839		return	Max. practical
Note. The pump manufacturers minimum							length
requirements must be complied with.		All dimensions in mm (in.).			N.B. Imperial dimensions are approximate

10 classic HE - Installation & Servicing