Danfoss KVP, KVR, KVL, KVC, KVD Service guide

Fitters notes Pressure regulators

Contents Page

Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

KVP evaporating pressure regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

KVR condensing pressure regulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

KVL crankcase pressure regulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

KVC capacity regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

KVD receiver pressure regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Identication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Soldering/brazing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Pressure testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Evacuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

KVP evaporating pressure regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

KVL crankcase pressure regulators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

KVR + NRD condensing pressure regulators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

KVR + KVD condensing pressure regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Danfoss pressure regulators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

regulators

Pressure

© Danfoss A/S (AC-DSL/MWA), 10 - 2006 DKRCC.PF.000.G1.02 / 520H1459 35

Notes

36 DKRCC.PF.000.G1.02 / 520H1459 © Danfoss A/S (AC-DSL/MWA), 10 - 2006

Fitters notes Pressure regulators

Application

KVP evaporating
pressure regulator

Type KV pressure regulators will control the low
and high pressure sides of the system under
varying load conditions:

KVP is used as an evaporating pressure
regulator.
KVR is used as a condensing pressure regulator.
KVL is used as a crankcase pressure regulator.
KVC is used as a capacity regulator.
NRD is used as a dierential pressure regulator
and as a receiver pressure regulator.
KVD is used as a receiver pressure regulator.
CPCE is used as a capacity regulator.

The evaporating pressure regulator is installed in
the suction line after the evaporator to regulate
the evaporating pressure in refrigeration sys­tems with one or more evaporators and one
compressor.

In such refrigeration systems (operating on
dierent evaporating pressures) KVP is installed
after the evaporator with the highest evaporating
pressure.

Each evaporator is activated by a solenoid valve
in the liquid line. The compressor is contolled by
a pressure switch in a pump down function.
The maximum pressure on the suction side
corresponds to the lowest room temperature.

Ak0_0031

Ak0_0025

regulators

Pressure

In refrigeration systems with parallel coupled
evaporators and common compressors, and
where the same evaporating pressure is required,
KVP must be installed in the common suction
line.

The KVP evaporating pressure regulator has a
pressure gauge connection for use when setting
the evaporating pressure. KVP maintains constant
pressure in the evaporator.

KVP opens on rising inlet pressure (evaporating
pressure).

Ak0_0019

Ak0_0023

© Danfoss A/S (AC-DSL/MWA), 10 - 2006 DKRCC.PF.000.G1.02 / 520H1459 37