Fast RHE Series Technisches Handbuch

0313-6180505-07

SELECTION, USE, INSTALLATION AND

MAINTENANCE MANUAL

HEAT RECOVERY UNITS WITH COOLING CIRCUIT

RHE Series

FAST S.p.A.

ISO 9001:2000 - Cert.n° 0882/4

Index

English

General norms 4

Unit description 5

Components decription 6

Accessories 7

Technical data 8

Operating limits 10

Sound data 10

Cooling performance variation 11

Fresh air temperature variations on the change of the external

air temperature 12

Heating efficiencies, pressure drops on air side, accessories MBCH, MSS 13

Cooling scheme summer operation 14

Cooling scheme winter operation 15

Dimensions 16

Accessories dimensions 19

Accessories assembly instructions 21

Instructions for assembling roofs for outside installation 21

Installation and use of the unit 23

Positioning of the supporting brackets 24

Ducts connection 25

Hydraulic connections, condensate drain discharge 25

FCH Free-cooling accessory 26

Electrical connections 27

Changing SET fans flow rate 27

Maintenance of the unit 30

Filters 30

Condensate drain pan 30

Recuperator 31

Fans motor assembly 31

Heat exchange coil 31

Decommissioning 31

Disposal 31

Diagnosis and fault solving 32

High efﬁciency heat recovery unit with cooling circuit - RHE -

Selection, installation, use and maintenance manual

General norms

The present manual is an integral part

of the documentation enclosed with the

machine.

It must be conserved for future reference

and must accompany the machine throu-

ghout its working life.

The manual defines the purpose to which

the machine was built and establishes the

correct installation and use limits.

• All use, installation and maintenance

instructions of the unit are described

in this manual as well as the main

accident prevention standards.

• Read carefully and fully all informa-

tion contained in this manual before

the installation, starting, use, main-

tenance and cleaning of the unit.

Pay particular attention to the use

regulations that are accompanied by

“DANGER” or “WARNING”, because if

not observed, they could cause dama-

ge to the machine and/or persons and

property.

• For irregularities not contemplated

by this manual, please consult the

local After Sales Service.

• FAST S.p.A. decline any responsibility

for any damage due to the improper

use of the machine, and to a partial or

superficial reading of the information

contained in this manual.

• Installation and maintenance must be

carried out by trained and qualified

personnel, having the requirements

laid down by law 46/90 and/or DPR

380/2001 for electric/electronic and

air conditioning installations, with

consequent registration at the local

CHAMBER of COMMERCE. Otherwise

FAST S.p.A. decline all responsibility

regarding the safety of the product.

THE MANUFACTURER DECLINES ANY

RESPONSIBILITY FOR DAMAGE TO

PROPERTY, PERSONS OR ANIMALS

CAUSED BY THE NON OBSERVANCE OF

THE INDICATIONS AND REGULATIONS

CONTAINED IN THE PRESENT MANUAL.

Even though a suitable risk analysis was

carried out during the design of the HRR

unit, pay ATTENTION to the pictograms on

the machine that make the reading of the

manual easier catching the readers atten-

tion concerning risks that can’t be avoided

or sufficiently limited with the adoption

of protection means and measures.

GENERAL DANGER SIGNS

Carefully observe all indications

at the side of the pictogram.

The non observance of the indications

could cause hazardous conditions with

possible injury to the operator and to the

user in general.

VOLTAGE DANGER SIGN

Carefully observe all indications

at the side of the pictogram.

The signs indicate components on the unit

or, in the present manual, identify areas

that could generat risks of an electrical

nature.

GENERAL WARNING SIGNS

Carefully observe all indications

to the side of the pictogram that

limit some actions in order to ensure grea-

ter safety for the operator.

MAIN GUARANTEE

CONDITIONS

• The guarantee does not includ pay-

ment for damages due to incorrect

installation by the installer.

• The guarantee does not include pay-

ment for damages due to the improper

use of the unit by the user.

• The manufacture is not responsible for

injuries to the installer or user, caused

by incorrect installation or improper

use of the unit;

• The equipment must be installed in

such a manner so as to allow mainte-

nance and/or repair operations;

• The guarantee does not cover in any

case costs due to turntable ladders,

scaffolding or othe similar elevating

systems that are necessary to carry

out operations under guarantee.

The guarantee is not valid if:

• the services and repairs have been

carried out by unauthorised personnel

or companies;

• the unit has been previously repaired

or modified with non original parts;

• the unit has not been suitably maintai-

ned;

• the instructions illustrated in the pre-

sent manual have not been observed;

• unauthorised modifications have

been made.

Note:

The manufacturer reserves the right to

carry out modifications at any time dee-

med necessary to improve their product,

and are not obliged to apply the said

modifications to previously manufactured

machines that have already been delive-

red or are being constructed.

The general conditions are in any case

subject to the general sale conditions

included on the stipulation of the con-

tract.

High efﬁciency heat recovery unit with cooling circuit - RHE -

Selection, installation, use and maintenance manual

Field 1, 2, 3: RHE

Field 4, 5: sizes 10 - 15 - 25 - 33

Description of the unit

The RHE series is the mono-block

solution to the needs of systems

normally used in bars, restaurants,

offices, meeting rooms. The RHE units,

which are divided into four sizes with

a rated airflow from 1000 to 3300

m3/h, have been designed to guarantee

a wellbeing conditions allowing a

suitable air change in order to reduce

the build-up of gas and undesired

particles present in the environment

to be treated (CO2, cigarette smoke,

unpleasant odours, sweat, dust,.).

The peculiarity of these series is repre-

sented by the high efficiency got thanks

the use of the cross flows plate recupe-

rator combined with a cooling circuit

in heat pump operating with refrigerant

R410A.

The RHE unit, in addition to the

ventilation, filtration and recovery of

heat, also includes, in a mono-bdamper

unit, a heat pump refrigerating circuit.

This allows to obtain a complete

machine which operates independently

in all seasons and which is capable of

combining the necessary renewal of air

with an efficient recovery of heat.

The accurate design of the machine

combines the extremely compact size,

which makes installation on suspended

ceilings easier, with easy accessibility

for the maintenance of all internal parts.

This gives the opportunity, also thanks

to the management and installation

simplicity, to satisfy many system

requirements.

WARNING

The RHE series is made to guarantee

indoor air supply and extraction. The

refrigerating circuit is calculated not

only for giving supply air characteristi-

cs near to that of the indoor air, with

the aim of avoiding disease conditions

near vents, but also for covering in part

ambient thermal loads.

Thermal and refrigerating capacities,

which carry air conditions from the

indoor air ones to those who cover in

part ambient thermal loads, are referred

to as thermal available capacity and

refrigerating available capacity. These

capacities are only an integration of

those guaranted by a conditioning unit.

The RHE series is not a conditioning

unit, and it cannot be set apart from a

conditioning unit if prefixed indoor air

conditions (temperature and humidity)

have to be guaranteed.

Available versions

The RHE units are available in 4

different sizes: Each model can be

configured in such a manner to satisfy

the system requirements by suitable

combining the available options.

The table in fig. 01 shows the procedure

of the commercial acronym in the

6fields from which it is made.

fig.01

Cooling circuit

accessibility

Condensate dischar-

ge 1” J UNI 338

Exhaust fan

Supply fan

Condensate dischar-

ge 1” J UNI 338

By-pass for free-

cooling

Room air suction

Outside air suction

Electrical panel

High efﬁciency heat recovery unit with cooling circuit - RHE -

Selection, installation, use and maintenance manual

Description of the components

Panels and frame:

The frame is made up of 25 mm thick

galvanised self-supporting sandwich panels

with injected polyurethane insulation (

density of 42 kg/m

) and nylon reinforced

corners with glass ﬁbre. The construction

of the casing simpliﬁes installation and

maintenance.

Fans:

They are centrifugal fans with forward-

curved blades and with directly connected

motor. The 230V - 50 Hz single-phase motor

has one speed. The airﬂow in case of pressure

drops changes of internal components

(clogging ﬁlters) and distribution system

remains costant.

Refrigerating circuit

This is a highly efﬁcient and silent heat

pump with scroll or rotative compressor

operating with refrigerant R410A (according

to sizes), four-way valve for cycle inversion,

evaporating coil, safety valve, condensing

coil, liquid receiver, thermostatic valve,

liquid light , high/low pressure switch and by

pass valve (for little sizes).

Condensate drain pan:

made of aluminium alloy, removable and

with double discharge.

Evaporating/condensating coil:

with cupper grooved tube and high efﬁciency

aluminium ﬁns.

Filters:

these are cell undulated type placed before

the recovery unit on the supply and return

airﬂow. The standard ﬁlters are class G4 type

in accordance with classiﬁcation UNI EN

779 with weighted efﬁciency of 90%. They

are 48 mm thick and are easily removable

from the top or bottom of the unit for to do

the cleaning or replacement.

Dirty ﬁlters pressure switch:

A differential pressure switch is present, pla-

ced close to the electronic controllers, for the

detection of the supply ﬁlter clogging. The

interventation value can be set. The pressure

switch includes clean contacts (NA, NC) to

remote the alarm.

Heat recovery unit:

This is static cross ﬂows recuperator

made of aluminium sheets to grant high

performances. During winter operation, the

average efﬁciency is above 80% for the ﬁrst

two sizes and 70% for the last two sizes,

ensuring ﬁrst-class energy recovery from the

air expelled from the room.

Support brackets:

They allow the unit to be rapidly and securely

ﬁxed to the false ceiling.

Accessibility:

The heat recovery, the condensate tank, fans

and ﬁlters are removable from the bottom,

removing the two lower panels (if the unit

is hanging), the same can be easily removed

from the air by removing the two top panels

(if units is on the ground). The inspection

of the electrical panel and the circuit is

guaranteed by side panels. For the inspection

of the ﬁlters, in both the cabinet and the ﬂoor

version, you can disassemble the openings

on the top and bottom panels are fastened

with ﬂyers.

Regulation

The unit is equipped with an electrical panel

with power and regulation section (including

the three-way valve for the additional hot

water coil and related servomotor), aimed

at guaranteeing the management of all

refrigerating circuit functions. Also present:

NTC temperature probe on the internal air

recovery, external air temperature probe,

pressure switch on the supply ﬁlter.

With the free-cooling accessory are supplied

dampers and servomotors.

A remote control terminal is also supplied

for the automatic management of the unit,

remotable up to 150 meter (cable not supplied).

The unit is equipped for the management of

a luminous sign (230V) which switches on in

case of generic alarm or unit OFF, in conformity

with the norms in force for rooms for smokers.

The following operations can be performed on

the microprocessor: switching on and off of the

unit, summer/winter changeover, setting of set-

point parameters, reading of room temperature

N.B. For further information refer to

the user manual.

Key

1 Cooling circuit

2 Electric board

3Centrifugal fan

4G4 Filter

5Heat recovery unit

6Exchange coil

7Condensate discharge

8Fans inverter

RHE 10-15

High efﬁciency heat recovery unit with cooling circuit - RHE -

Selection, installation, use and maintenance manual

fig.02

Accessories

MBCH Hot water coil module

This is an external module that can be

installed downstream from the motor

fan assembly on the fresh air flow,

equipped with:

• Two-row water heating coil

with copper pipes and aluminium fins

with P2519 geometry. The collectors

are equipped with a ½" G UNI 338

threaded connector for the water inlet

and outlet.

• The three-way valves and

related ON/OFF actuator.

MBCX Module with battery

This is an outside module that can be

installed downstream from the motor

fan assembly on the fresh air flow,

equipped with:

• Electric battery with armoured

finned elements.

• double safety thermostat with

automatic and manual reset.

FCT F7 efficiency filters

The units can be fitted with two

cell-type undulated filters in class

F7 according to the UNI EN 779

classification which can be placed as

a replacement of the G4 filters. The

filtrating cell is 48 mm thick.

MSS Module with silencers

The accessory is made up of one

module that is equipped with silencer

positioned on the supply or exhaust.

(For sizes 10 and 15, the accessory is

only inlet compatible).

It is made of rockwool panels with

the surfaces in contact with the air

and protected by a polyester film held

between two galvanised and micro-

perforated laths.

FGE circular flanges

One accessory is supplied.

The accessory should be joined to the

rectangular openings of the base unit

in such a way as to allow for the use

of circular channels. The accessory

is not compatible with the MBCH,

MBCX, MSS and FBH accessories. NB

for further information refer to the

tables in this manual and to the various

accessory kits; for compatibility refer

to fig. 02

FCH Free-cooling kit

It allows for the unit operation in free

cooling (temperature only).The “free-

cooling kit ” includes 2 dampers with

related ON/OFF 230V servomotors.

For further information refer to the Use

manual.

BIT Base for floor installation

BIM Base for floor installation of the

additional modules

The accessories, equipped with a metal

frame with high 120 mm, allow to tran-

sform the standard unit to a unit which

can be placed on floor.

TPE Roof for outside installation

TPM Roof for outside installation

of the additional modules

TPMSS Roof for outside installation

of the silencers modules

This accessory, made of galvanized sheet,

allows for the protection from rainings for

unit and its accessories.

*: supplied with appendages near the

speed regulators on the outside of the

base unit, to protect these from solar irra-

diation.

RS485 Interface card

Interface card necessary for the interface

to supervisione systems according to the

MOD-BUS protocol.

MBCH MSS FGE

MBCX

Size

Accessories and description 10 15 25 33

MBCH Module with hot water coil MBCH1 MBCH2

MBCX Module with electric battery MBCX1 MBCX2 MBCX3 MBCX4

BIM Base for addit. modules floor install BIM1

TPM Roof for add. modules outside install TPM1 TPM2

FCT Compact filters efficiency class F7 FCT1 FCT2 FCT3

BIT Base for floor installation BIT1 BIT2 BIT3

TPE Roof for outside installation TPE1 TPE2 TPE3

FCH Free-cooling Kit FCH1 FCH2

RS485 RS485 cards RS485

MSS Silencers modules MSS1 MSS2

TPMSS Roof for silencers outside installation TPMSS1 TPMSS2

FGE Circular flanges FGE1

High efﬁciency heat recovery unit with cooling circuit - RHE -

Selection, installation, use and maintenance manual

Technical data

Caution: the electronic regulators that are

incorporated in the machine allow to regulate

the air flow in the limits indicated in the

previous table in order to set the system. Once

setting has been completed, the regulators no

longer need to be touched.

1) Fan power supply: 230 V; nominal airflow rate;

without accessories;

(2) Operating conditions: return air 26°C 50%, external

air 34°C 50%;

(3) Operating conditions: return air 20°C 50%, external

air -5°C 80%;

(4) At a free field distance of 1 m with ports canalized.

RHE MODEL 10 15 25 33

External maximal air flow [m3/h] 1000 1500 2500 3300

Recovery maximal air flow [m3/h] 1000 1500 2500 3300

Minimum air flow [m3/h] 800 1000 2000 2500

Supply static available pressure (1) [Pa] 320 245 140 220

Exhaust static available pressure (1) [Pa] 320 245 140 220

Total heating capacity (rec. + compr.) (3) [kW] 7,5 14,2 24,8 33,1

Total cooling capacity (rec. + compr.) (2) [kW] 6,6 8,7 13,8 19,8

Available heating capacity (3) [kW] 2,8 2,9 3,9 7,0

Available cooling capacity (2) [kW] 1,8 3,1 3,3 5,4

Recovered heating capacity (3) [kW] 3,6 10,0 15,3 19,6

Recovered cooling capacity (2) [kW] 2,2 3,2 4,5 5,8

Refrigerating circuit heating capacity (3) [kW] 3,9 4,2 9,5 13,5

Refrigerating circuit cooling capacity (2) [kW] 4,4 5,5 9,3 14,0

Tot. input power in winter (3) [kW] 2,2 2,4 4,2 4,9

Tot. input power in summer (2) [kW] 2,6 2,9 5,1 6,5

Sound pressure level (4) [db(A)] 66 69 72 75

Power supply 1-230-50 1-230-50 3+N-400-50 3+N-400-50

RECUPERATOR

Efficiency in winter [%] 82 80 73 71

Efficiency in summer [%] 82 80 68 65

FANS

Fans number 2222

Total nominal input power [kW] 0,9 0,9 2,1 2,1

Total max. absorbed current [A] 7,6 7,6 10,5 10,5

Protection class IP 55 55 55 55

FILTERS

Classification according to EN779 G4 G4 G4 G4

Weight efficiency [%] 90 90 90 90

Classification according to EN779 (filters, accessories) F7 F7 F7 F7

Additional pressure drop for F7 filters (optional) Δ[Pa] 35 59 58 63

REFRIGERATING CIRCUIT (COMPRESSOR)

Refrigerant R410A R410A R410A R410A

Compressors input power in winter (3) [kW] 1,3 1,5 2,1 2,8

Compressors input power in summer (2) [kW] 1,7 2,0 2,8 4,4

Compressors max. absorbed current [A] 10,0 11,0 7,0 10,3

CONDENSATE DRAN PANEL

Diameter of the condensate dran panel charge [in] 1” 1” 1” 1”

High efﬁciency heat recovery unit with cooling circuit - RHE -

Selection, installation, use and maintenance manual

1) Inlet/outlet water temperature 70/60°C. Compressor

running. Operating conditions: return air 20°C 50%,

external air -2°C 80%;

(2) Inlet/outlet water temperature 45/40°C. Compressor

running. Operating conditions: return air 20°C 50%,

external air -5°C 80%;

MBCH - Water heating coil 10 15 25 33

Rows [n] 2222

Front surfaces [m2]0,238 0,238 0,238 0,314

Air side pressure drop at nominal flow rate [Pa] 7 183737

Heating capacity (1) [kW] 7,68 10,35 15,56 19,7

Heating capacity (2) [kW] 2,57 4,04 6,45 7,6

Water flow rate (1) [l/h] 673 906 1363 1725

Water side pressure drop (nominal conditions) (1) [kPa] 1181832

Water flow rate (2) [l/h] 446 700 1118 1311

Water side pressure drop (nominal conditions) (2) [kPa] 3 6 14 22

Water coil manifolds diameter [in] 3/4” 3/4” 3/4” 3/4”

MBCX - Electric heating coil

Power supply 3 ph - 400 V - 50 Hz (power supply separated from unit power supply)

Heating capacity [kW] 5 7,5 12,5 16,5

Air side pressure drop at nominal flow rate [Pa] 10 10 10 10

Stages [n] 1111

Electric absorbed current [A] 7,6 11,4 19,0 25,1

ACCESSORIES

High efﬁciency heat recovery unit with cooling circuit - RHE -

Selection, installation, use and maintenance manual

Operating limits

In their standard set-up, the equipment

is not suitable for installation in a saline

environment. Refer to fig. 03 for the

operating limits.

N.B: Please contact FAST technical

sales office in the event it is necessary

to operate the machine outside the

limits indicated in the diagram.

Summer operation Winter operation

(heat pump)

fig.03

10 15 21 33

Max external temperature during cooling °C 43 43 43 43

Min external temperature during cooling °C 16 16 16 16

Max internal temperature during cooling °C 34 34 34 34

Min internal temperature during cooling °C 18 18 18 18

Min external temp with heat pump operating °C -10 -10 -10 -10

Max external temp with heat pump operating °C 28 28 28 28

Max internal temp with heat pump operating °C 30 30 30 30

Min internal temp with heat pump operating °C 14 14 14 14

Pressione sonora per frequenza centrale di banda (Hz) Press. sonora Press. sonora Pot. sonora

RHE 63 125 250 500 1000 2000 4000 8000 Totale Totale Totale

dB dB dB dB dB dB dB dB dB dB (A) dB (A)

10 57 58 51 50 50 43 39 33 63 54 64

15 61 64 56 50 49 46 40 33 66 56 67

25 62 68 57 53 49 47 46 36 70 56 68

33 65 72 64 56 52 48 42 37 72 60 73

Sound data

• Sounda data attenuation with SUF - Module with silencers (accessory)

63 125 250 500 1000 2000 4000 8000

dB dB dB dB dB dB dB dB

MSS 9 0 2 5 5 9 14 11

• Data outside the panel: (the data are calculated at the following conditions: 1 m. distance from the unit, ducted supply vent and in free ﬁeld)

18 26 34

t int (°C)

t ext (°C)

-10

t int (°C)

t est (°C)

14 20 30

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