Danfoss 841, 842 Installation guide

841 & 842

Seven Day Pulsed Output Electronic Timeswitches

110 Volt

INSTALLATION INSTRUCTIONS

The Model 841 & 842 Timeswitches must be installed by a competent electrician and the installation should conform to IEE Wiring Regulations.

Installation & Wiring

1.Slacken the four Þxing screws, one in each corner of the unit, and carefully separate the front and rear portions.Unplug the ribbon cable from the rear portion.

CAUTION: Do not allow either half of the unit to hang by the ribbon cable as damage could be caused.

2.Remove the polystyrene packing piece from the top of the transformer. It is marked ÔREMOVEÕ.

3.Select the desired Þxing position and observe the labelÔTHIS WAY UPÕ inside the rear portion. The two halves will only assemble correctly one way round.

4.Four Þxing holes are provided for attaching the rear portion to the wall or mounting surface.

Conduit box adaptors as shown below are available if required.

Part No.: 8/3223 Double Gang Surface Box Adaptor

Cable

Entry

Aperture

2 Þxings for	Alternative 4 Þxings	4 Þxings for Mark
double gang	for double gang	8 Timeswitch
surface box	surface box

5.Surface cable entries to the units can be made from above, below or from the left hand side.Conduit or recessed cable entry is through the aperture in the rear moulding.

6.For surface cable entry remove the appropriate knock-out and ensure one of the two cable clamps is positioned correctly.

7.Connections to the units should be made as shown below.

MODEL 841

			Spare	N	L		1	2
						Link for 110V
						control circuit
					110V, 50 Hz			Output
					Mains Supply			(LOAD)
MODEL 842
Spare	N	L	6	5	4	3	2	1
			OFF	ON	Link for
					110V	OFF	ON
			Channel 2		control	Channel 2
	110V, 50 Hz				circuit(s)

Mains Supply

If the control circuit(s) are to operate at 110V then terminals L & 1 (Model 841) and terminals L, 1 and 4 (Model 842) must be linked, ensuring that the cable is sheathed and of a size to carry the required load current.

If,however,the control circuit(s) are operating at other than 110V then no link(s) shall be Þtted and in the case of Model 841 both terminals 1 and 2 should be connected to the load.

In the case of Model 842 terminals 1, 2 and 3 (if required) should be connected to the load controlled by Channel 1 and terminals 4, 5 and 6 (if required) to the load controlled by Channel 2.

8.The unit is supplied set for a 5 second single pulse output. If a multi pulse output is required, proceed as described in paragraph 10 (b). If a number of pulses or the pulse duration is required to be different from supplied, proceed as described in paragraph 11(b).

9.Upon completion of wiring plug in the ribbon cable ensuring the polarised plug is fully inserted into the socket.ReÞt the front half of the timeswitch ensuring correct alignment and that no cables are trapped before re-tightening the screws.

10.TO CHANGE FROM SINGLE TO MULTI PULSE OUTPUT

(a)Remove the front portion of the unit as described in ÔInstallation and WiringÕ paragraph 1.

(b)A push/pull switch is provided on the rear of the printed circuit board inside the front portion of the unit.

With the switch pulled out (as supplied) this provides a single pulse output. Push the switch in to achieve a multi pulse output (½ second on followed by ½ second off).

On Model 842 a push/pull switch is provided for each channel to enable different types of pulsed output if required.The switch relating to each channel is clearly marked.

11.RESETTING OF SWITCHING DURATION

(a)Remove the front portion of the unit as described in ÔInstallation and WiringÕ paragraph 1.

(b)The bank of four miniature rocker switches is mounted on the printed circuit board inside the front portion of the unit.

When switch no. 1 is ÔonÕ 1 second duration is set. When switch no. 2 is ÔonÕ 2 seconds duration is set. When switch no. 3 is ÔonÕ 4 seconds duration is set. When switch no. 4 is ÔonÕ 8 seconds duration is set. When all 4 switches are ÔonÕ the duration is

1 + 2 + 4 + 8 = 15 seconds.

Any combination of the 4 switches may be selected to set from 1 to 15 seconds in increments of 1 second.

If all 4 switches wereÔoffÕthere would be no output and so this setting should be avoided.

EXAMPLES

	Slider Switch Posi-										‘ON’
			tions								Duration
	1		2			3	4				NONE
	ON
	OFF										Do Not Use
	1		2			3	4
	ON										1 second
	OFF
	1		2			3	4
	ON										2 seconds
	OFF
	1		2			3	4
	ON										3 seconds
	OFF
	1		2			3	4
	ON										4 seconds
	OFF
	1		2			3	4				5 seconds
	ON
	OFF										(As supplied)
	1		2			3	4
	ON										6 seconds
	OFF
	1		2			3	4
	ON										7 seconds
	OFF

	Slider Switch Posi-										‘ON’
			tions								Duration
	1		2			3	4
	ON										8 seconds
	OFF
	1		2			3	4
	ON										9 seconds
	OFF
	1		2			3	4
	ON										10 seconds
	OFF
	1		2			3	4
	ON										11 seconds
	OFF
	1		2			3	4
	ON										12 seconds
	OFF
	1		2			3	4
	ON										13 seconds
	OFF
	1		2			3	4
	ON										14 seconds
	OFF
	1		2			3	4
	ON										15 seconds
	OFF

1

Technical Specification	Model 841			Model 842
Max. current rating of output	15A at 110 Vac			3A* (at 110 Vac on each channel.
				* If set as multi pulse output giving 15 pulses
				per event 200 times per week, rating reduces
				to 1A at 110 Vac
				Conversely if set as single pulse at 100	events
				per week, rating increases to 5A at 110 Vac
Output contacts	Enclosed single pole single throw (SPST)			Enclosed single pole double throw (SPDT)
	Type B			voltage free on each channel Type B
Mains supply required	110 V (+/-10%) AC 50/60 Hz			100V (+/-10%) AC 50/60 Hz
Battery reserve	Retains memory settings for a period of 3 months during mains power failure (once battery is
	fully charged)
Temperature Rating		0¡C to 45¡C
Enclosure Rating			IP30
Max Ambient Temperature			45¡C
Overall Dimensions	210mm wide, 115mm high, 50mm deep
Max. No. of programmable operations	200 which may be freely allocated throughout the 7 days
Setting and Running Accuracy	+/- 1 min and +/- 1 min/month
Mode of operation	Provides either a continuous or interrupted			Provides either continuous or interrupted pulse
	pulse (½ second ÔONÕ followed by ½ second			(½ second ÔONÕ followed by ½ second ÔOFFÕ)
	ÔOFFÕ) for a duration of between 1-15 seconds			on each channel for a duration of 1-15
	at each programmed event.			seconds at each programmed event.
	The unit leaves the factory set for a single			The unit leaves the factory with both channels
	pulse of 5 seconds duration.This can be reset			set for a single pulse of 5 seconds duration.
	if required (see paragraphs 10 and 11 overleaf)			Either or both of these can be reset
				independently of each other to give differing
				outputs (see paragraphs 10 and 11 overleaf).
Control Pollution Situation		Degree 2
Software ClassiÞcation		Class A
Rated Impulse Voltage			2.5kV
Ball Pressure Test			75¡C

		MODEL 841					MODEL 842
	Alternative position		Do not slacken the			Alternative position
	for cable clamp	C/L	screws on this side of	Polarised		for cable clamp	C/L		Polarised
			the terminal block	plug					plug
	THIS WAY UP					THIS WAY UP	Spare
		Spare
Aperture		N			Aperture		N
for					for		L
cable					cable
		L					6
entry					entry
							5
							4
		1					3
4 Þxing		2			4 Þxing		2
							1
holes					holes
2 cable	3 knockouts for	Rating and	Terminal block	Do not route	2 cable	3 knockouts for	Rating and	Terminal block	Do not route
clamps	surface cable	model label		surface mounted	clamps	surface cable	model label		surface mounted
	entry			cables through		entry			cables through
				shaded area					shaded area

Danfoss Randall can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss Randall reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequent changes being necessary in speciÞcations already agreed.

Danfoss Randall Ltd,

Ampthill Road,

Bedford MK42 9ER

Tel: [phone] Fax: [phone]

Email: [e-mail]

Website: www.danfoss-randall.co.uk

2	Part No: 3262 Issue 5 12/05