Danfoss APP 0.6-1.0, APP 1.5-2.5, APP 3.0-3.5 Installation guide

Instruction

APP pumps

APP 0.6-1.0 / APP 1.5-2.5 / APP 3.0-3.5

hpp.danfoss.com

Instruction | APP pump instruction APP 0.6-1.0, APP 1.5-2.5 and APP 3.0-3.5

Table of Contents	1.	Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . 3
	2.	System design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	.	.	.	3
	2.1	Open-ended systems with water supply from a tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . .	. .	. .	3
	2.2	Open-ended systems with direct water supply . . . . . . . . . . . . . . . . . .	.	.	.	3
	2.3	Problems with reversing pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. .	. .	. .	3

2.4General guidelines for calculation of pressure losses . . . . . . . . . . . . . . . . . . . 4

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

5.5.1Open-ended systems with water supply from tank . . . . . . . . . . . . . . . . . . . 7

5.5.2 Open-ended systems with direct water supply . . . . . . . . . . . . . . . . . . . . . 8

6.	Service . . . . . . . . .	. . . . . .	. . . . . .	. . . . . . . .	. . . . . .	. . . . . . 8
6.1	Periodic maintenance . . . .	. . . . . . . . . . . .	. . . . . . . . . . . .	. . . . . . . . . . . . . . . .	. . . . . . . . . . . .	. . . . . . . . . . . 8
6.2	Repair . . . . . . . . . .	. . . . . .	. . . . . .	. . . . . . . .	. . . . . .	. . . . . 8

2	180R9065 | 521B0733 | DKCFN.PI.013.C9.02 | 11.2019

Instruction | APP pump instruction APP 0.6-1.0, APP 1.5-2.5 and APP 3.0-3.5

1.Identification

PUMP

	Type	APP 0.6	MADE IN DENMARK
	Code no.	180BXXXX

Serial no. XXXXXX02-XXX

Danfoss A/S, 6430 Nordborg, Denmark

2. System design

The design of the system must ensure that self

emptying of the pump during standstill is

avoided.

The inlet pressure of the pump must never

exceed the outlet pressure. This may typically

occur in boosted or open-ended systems with

direct water supply.

In order to avoid this it is recommended to install

a pre-stressed check valve or a pressure switch in

the pump inlet.

The opening pressure of the check valve must be

bigger or equal to the inlet pressure.

2.1

Open-ended systems with water supply

from a tank

(The numbers 1-3 refer to the drawing below.)

In order to eliminate the risk of cavitation,

observe the following guidelines:

1)

Place the tank above the pump (water level

in the tank should always be above the

pump).

2)

Place the inlet filter before the tank.

3)

Dimension the inlet line to obtain mini-

mum pressure loss (large flow area,

minimum pipe length, minimum number

of bends/connections, fittings with small

pressure losses).

2.2Open-ended systems with direct water supply

The pump is supplied with water direct from a booster pump.

The water pressure must not exceed 5 barg (72.5 psig).

5barg [72.5 psig]

2.3 Problems with reversing pumps

If exposed to high pressure in the outlet while the electric motor is not energized, the pumps will start spinning backwards. This will not harm the pumps as long as the pressure in the inlet does not exceed the max. pressure of 5 barg.

If a non-return valve is mounted in the inlet line, a low-pressure relief valve will also be required. Alternatively a high-pressure check valve could be mounted in the pump discharge line to prevent the pump from reversing.

The dotted setup ensures that the inlet pressure does not exceed the 5 barg, when a nonreturn valve is mounted in the inlet.

180R9065 | 521B0733 | DKCFN.PI.013.C9.02 | 11.2019

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