Danfoss APP W HC 15-3 Installation guide
Instruction
Instruction
APP W HC pump instruction
APP W HC pumps
APP W HC 15 - 30
APP W HC 21-43
hpp.danfoss.com
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Instruction | APP W HC 15-30 pumps
Table of Contents
1. Identification ...........................................................................2
2. System design ..........................................................................3
2.1 Open-ended systems with direct water supply...........................................3
2.2 Preferred RO system design and P&ID ...................................................3
2.3 Reversible pumps .......................................................................4
2.4 General comments......................................................................4
3. Building up the pump unit ..............................................................4
3.1 Mounting...............................................................................4
3.2 Direction of rotation ....................................................................5
3.3 Orientation .............................................................................5
3.4 Protection from too high pressures ......................................................5
3.5 Connections ............................................................................6
4. Initial start-up ...........................................................................7
5. Operation...............................................................................7
5.1 Temperature............................................................................7
5.2 Pressure ................................................................................8
5.3 Dry running.............................................................................8
5.4 Disconnection ..........................................................................8
5.5 Storage .................................................................................8
6. Service..................................................................................8
6.1 Warranty................................................................................8
6.2 Maintenance............................................................................8
6.3 Repair ..................................................................................8
1. Identification
PUMP
Type APP W HC 15
Code no. 180B5000
Serial no. XXXXXX02-XXX
MADE IN DENMARK
Danfoss A/S, 6430 Nordborg, Denmark
2
AN283148361728en-000 402 | 10.2019
Instruction | APP W HC 15 - 30 pumps
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.
2.1 Open-ended systems with direct water
supply
The pump is supplied with water directly from a
feed pump.
The inlet pressure for APP W HC 15-30 must be at
least 2 barg (29 psig).
To protect the pump from being damaged by
peaks of high-pressure in case the pump stops
momentarily, it is required to mount a lowpressure relief valve on the inlet line.
2.2 Preferred system design and P&ID
1. Dimension the inlet line to obtain minimum pressure loss (large flow, minimum
pipe length, minimum number of bends/
connections, and fittings with small
pressure losses).
2. Place an inlet filter (1) in front of the
APP W HC pump (2). Please consult Danfoss
filter data sheet for guidance on how to
select the right filter. Thoroughly clean
pipes and flush system prior to start-up.
3. Place a monitoring pressure switch (3) set
at min. inlet pressure between filter and
pump inlet. The monitoring switch must
stop the pump at pressures lower than
minimum pressure.
4. Use flexible hoses (4) to minimize vibrations
and noise.
5. In order to eliminate the risk of damage
and cavitation, a positive pressure at the
inlet (5) is always to be maintained at min.
inlet pressure and max. inlet pressure.
Inlet
Outlet
It is recommend to install safety valve or a
pressure relief valve (9) in order to avoid
high-pressure peaks in case the pump stops
momentarilly or is spinning backwards.
6. For easy system bleeding and flushing, a
bypass non-return valve (6) is integrated in
the APP W HC pump.
7. A non-return valve (7) in outlet can be
installed in order to avoid backspin of the
pump. The volume of water in the membrane vessel works as an accumulator and
will send flow backwards in case of the
pump stops momentarily.
8. A safety valve or a pressure relief valve (8)
can be installed in order to avoid system
damage as the Danfoss APP W HC pump
creates pressure and flow immediately after
start-up, regardless of any counter
pressure.
Note: If a non-return valve is mounted in the
inlet line, a low-pressure relief valve is also
required between non-return valve and pump
as protection against high-pressure peaks.
Feed
Media filter
PI
PI
PI PI
1 1
Fresh water
permeat flush
AN283148361728en-000 402 | 10.2019
M
9
3
PT
2
7
5
6
8
PI
Permeate
4
PI
Brine
3
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