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.

© Danfoss | Climate Solutions | 2021.11 AB374240933694en-000101 | 3

ICFD defrost module | Liquid drain

Liquid drain

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

© Danfoss | Climate Solutions | 2021.11 AB374240933694en-000101 | 4

Description

Values

Maximum dierential pressure

15 bar/218 psig

Minimum densitet

610 kg/m3 /38,0 lb/ft

3

Max working pressure with oat

28 bar/406 psig

Description

Values

Maximum

dierential pressure

36 Bar/522 psig

Minimum densitet

860 kg/m

3

/53,7 lb/ft

3

Max working pressure with

oat

52 bar/754 psi

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 ow when the oat is lifted by the internal liquid level.
The ICFD is a balanced type of oat valve suitable for high dierential pressure. The ICFD is available in two dierent
versions.

ICFD 20 (ammonia)

Is specically designed for ammonia. In order to operate with low density uids, the oat is manufactured with a
very low weight.

Table 1: ICFD 20 (ammonia)

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 oat ball is dis-mounted during the pressure test.

CFD 20-C (CO2)

Is specically designed for CO2. In order to operate with high pressure, the oat is manufactured with a large wall
thickness, and therefor has a higher weight.

Table 2: ICFD 20-C (CO2)

 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 oat ball is dis-mounted during the pressure test.
ICFD liquid drain module is patent pending.

© Danfoss | Climate Solutions | 2021.11 AB374240933694en-000101 | 5