Danfoss ICFD defrost module Application guide

Application Guide

ICFD defrost module

Supplemental application guidelines

ICFD defrost module | Contents

Contents
Introduction	3
Liquid drain	4
ICFD liquid drain module (ICFD 20 / ICFD 20-C)	5
ICF liquid drain method	6
ICF valve station with ICFC 20P1 loaded check valve	7
Liquid drain to a separate defrost line	9
Multiple evaporators connected to a common ICF evaporator station	10
Protection of evaporators against excessive pressure caused by trapped liquid	11
Installation	13
Online support	16

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ICFD defrost module | Introduction

Introduction

This ICFD supplemental application guide describes the special requirements to be taken into account when designing the liquid drain line with ICFD defrost module.

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ICFD defrost module | Liquid drain

Liquid drain

Liquid drain method is the most energy efficient method. The method ensures that only liquid condensate is drained back to the suction accumulator and minimizing the hot gas consumption.

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ICFD defrost module | ICFD liquid drain module (ICFD 20 / ICFD 20-C)

ICFD liquid drain module (ICFD 20 / ICFD 20-C)

Float operated valve module. The module opens for liquid flow when the float is lifted by the internal liquid level. The ICFD is a balanced type of float valve suitable for high differential pressure. The ICFD is available in two different versions.

ICFD 20 (ammonia)

Is specifically designed for ammonia. In order to operate with low density fluids, the float is manufactured with a very low weight.

Table 1: ICFD 20 (ammonia)

Description	Values
Maximum differential pressure	15 bar/218 psig
Minimum densitet	610 kg/m3 /38,0 lb/ft3
Max working pressure with float	28 bar/406 psig

NOTE:

If the refrigeration system includes ICFD 20 module, the test pressure of the system must not exceed 28 bar/406 psig, unless the ICFD float ball is dis-mounted during the pressure test.

CFD 20-C (CO2)

Is specifically designed for CO2. In order to operate with high pressure, the float is manufactured with a large wall thickness, and therefor has a higher weight.

Table 2: ICFD 20-C (CO2)

Description	Values
Maximum differential pressure	36 Bar/522 psig
Minimum densitet	860 kg/m3 /53,7 lb/ft3
Max working pressure with float	52 bar/754 psi

NOTE:

If the refrigeration system includes ICFD 20-C module, the test pressure of the system must not exceed 52 bar/754 psig, unless the ICFD 20C float ball is dis-mounted during the pressure test.

ICFD liquid drain module is patent pending.

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