Danfoss PAH, PAHT Installation guide

Instruction

PAH, PAHT pumps

PAH / PAHT 2-12.5

hpp.danfoss.com

Instruction	Pump instruction PAH / PAHT 2-12.5

Table of Contents	1.	Identification . . . . . . . . . . . . . . .	. . . . . . .	. . . . . .	. . . . . . .	.	.		. 2
	2.	System design . . . . . . . . . . . . . . .	. . . . . .	. . . . . .	. . . . . . .	.	.	.	3
	2.1	Closed-system design . . . . . . . . . . .	. . . . . .	. . . . . .	. . . . . . .	.	.	.	3
	2.2	Open-system design . . . . . . . . . . . .	. . . . . .	. . . . . .	. . . . . . .	.	.	.	4

2.3General guidelines for calculation of pressure losses . . . . . . . . . . . . . . . . . . . 5

2.4	General comments on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.	Building up the pump unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1	Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2	Direction of rotation	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.3	Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.4	Protection from too high pressures . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.5	Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.	Initial start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.	Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1	Water quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.2	Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.3	Pressure . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.4	Dry running . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.5	Disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.6	Storage . . . . . . .	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5.6.1Water hydraulic systems, water recirculated . . . . . . . . . . . . . . . . . . . . . . . 8

5.6.2Open-ended systems with water supply from tank. . . . . . . . . . . . . . . . . . . . 9

5.6.3 Open-ended systems with direct water supply. . . . . . . . . . . . . . . . . . . . . . 9

6	Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7.	Recommended service intervals . . . . . . . . . . . . . . . . . . . . . . .									. . . . . 9
7.1	General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . .									. . . . . 9
7.2	Inspection of pump parts . . .	. . . .	. .	. . .	.	. . . . .	.	. . . . .	. . .	.	.	.	.	. 9
7.3	How to inspect the pump . . .	. . . .	. .	. . .	.	. . . . .	.	. . . . .	. . .	.	.	.	.	. 9

1.Identification

2 | 180R9277 | AN103586502885en-000501

Instruction	Pump instruction PAH / PAHT 2-12.5

2.	System design	2.1	Closed-system design
		A	Inlet line:
			Dimension the inlet line to obtain mini-
			mum pressure loss (large flow, minimum
			pipe length, minimum number of bends/
			connections, and fittings with small
			pressure losses).
		B	Inlet filter:
			Install the inlet filter (1) in front of the tank
			(2). Please consult the Danfoss filter data
			sheet for guidance on how to select the
			right filter.
		C	Monitoring pressure switch:
			Install the monitoring pressure switch (3) in
			front of the filter (1). Set the maximum inlet
			pressure to 2 barg (29.0 psig). The monitor-
			ing pressure switch will stop the pump (5) if
			inlet pressure is higher than 2 barg
			(29.0 psig), indicating that the filter element
			must be changed.
		D	Monitoring temperature switch:
			Install the monitoring temperature switch
			(4) in the tank. Set the temperature value
			according to technical data, item 4. The
			monitoring temperature stops the pump if
			inlet temperature is higher than the set
			value.
		E	Hoses:

Always use flexible hoses (6) to minimize vibrations and noise.

FInlet pressure:

In order to eliminate the risk of cavitation and other pump damage, pump inlet pressure must be maintained according to specifications described in item 4, technical data.

GNon-return valve (7):

Should be installed after the outlet to prevent pump backspin, which may ruin the pump.

HPressure relief valve:

As the Danfoss PAHT pump begins to create pressure and flow immediately after start-up regardless of any counter pressure, a pressure relief valve (8) should be installed to prevent system damage.

ISystem water filling:

To ensure proper filtration of new water (10) supplied to the system, always use the filling valve (9).

JMinimum level switch:

Install the minimum level switch (11) above the outlet of the reservoir. The level switch must stop the pump if the water in the reservoir is below the switch, which indicates that the reservoir is empty.

	2
11	4
	Reservoir
		<![if ! IE]> <![endif]>M	5
	6	<![if ! IE]> <![endif]>M	6	7
	PI			PI
				System
			9	8
				8
	1		10
	1
		3

180R9277 | AN103586502885en-000501 | 3

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