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Packaged rooftop units

with integrated gas burner

- When starting the compressors, check the subcooling and overheating

and thus verify if the refrigerant load is appropriate

to the operating conditions. To adjust the

refrigerant load, a schrader valve is available on

the liquid line.

- Verify the absence of any leaks of the refrigerant.

- Check the unit operation and verify the safety elements.

- All the 48EN/EH models are

equipped with scroll type

compressors and have a phase

control relay. Verify that they

turn in the correct direction and,

if not, reverse the power wires.

10. S

TARTING

THE

UNIT

R 410A

Operational checks

Check the unit operation by verifying the electronic control and the

safety elements.

It is also recommendable to create a report, taking note of the date,

which includes the following information: the nominal voltage, current

absorbed by the compressors, fans and other electrical components,

signifi cant temperatures in the cooling circuit (see table below) and

other aspects considered interesting such as alarms detected by the

electronic control of the unit. The recording of these parameters whilst

the unit is running allows controlling the installation performance and

it is the best possible way to avoid breakdowns since the analysis

of these data makes early detection of anomalies possible or the

provision of the necessary means available to ensure that they do

not take place.

Possible problems at commissioning

All indications given in this brochure must be respected and

complied with to guarantee a correct operation of the units.

Next, several possible operation problems are stated which could

happen if the conditions of the commissioning are not appropriate.

- Air

fl ow lack: very high differences between inlet and outlet, originated

by a high pressure drop in the ducts, or by other causes that impede

the correct air circulation.

- Air recirculation in the unit, originated by some obstacle in the air

aspiration or outlet.

- Noise problems because of excessive air fl ow in the grille.

- Water overfl owing to the pan problems, originated by an excessive

fl ow, an incorrect siphon installation or because a defective unit level.

- Refrigerant circuit humidity problem, because of an incorrect vacuum

realization.

Checks prior to commissioning

- It is advisable to make a complete sketch of the installation including

the location of the unit and all the components used. This will be very

helpful for maintenance and repairs to the installation.

- Check that the electrical power supply matches the unit voltage and

that its value lies within acceptable limits.

- It must also be verifi ed that the electric installation has been carried

out according to the electric wiring diagram provided with the unit

(consult the chapter on “Checking before commissioning”).

- Once the above verifi cations have been carried out, the control

circuit is supplied with voltage by the automatic control switch. It is

necessary to leave with voltage the compressor crankcase heater

for 24 hours before starting the compressor.

WICHTIG: WIEDERBEHEIZUNG DER

OLWANNE

IMPORTANT: CRANKCASE HEATING

IMPORTANT: SURCHAUFFE CARTER D’HUILE

IMPORTANTE: RISCALDARE IL CARTER

DELL’OLIO

IMPORTANTE: RECALENTAMIENTO DE

ACEITE DEL CÁRTER

KOENNEN.

TO ALLOW THE COMPRESSOR(S) STARTING

AU PREMIER DÉMARRAGE OU APRÈS UNE ABSCENCE

T E N S I O N 2 4 H E U R E S A V A N T D ’ A U T O R I S E R L E
DÉMARRAGE DU(DES) COMPRESSEUR(S).

AL PRIMO AVVIAMENTO U DOPO UNA INTERRUZIONE
PROLUNGATA DELLA ALIMENTAZIONE ELETTRICA,
LASCIARE LA MACCINA SOTTO TENSIONE PER 24 ORE
PRIMA DI AUTORIZZARE L’AVVIAMENTO DEL(DEI)
COMPRESSORE(I).

ANTES DEL PRIMER ARRANQUE O DESPUÉS DE UNA
AUSENCIA DE CORRIENTE POR UN LARGO PERIODO DE
TIEMPO, CONVIENE QUE LA UNIDAD ESTÉ CONECTADA
UN MÍNIMO DE 24 HORAS.

BEIDER ERSTEN INBETRIEBSETRUNZ ORDER NACH EINER
LANGEN STROMUNTER-BRECHUNG BRINGEN SIE DIE
M A S C H I N E U N T E R S P A N N U N G 2 4 S T R U N D E R L A N G
BEVOR SIE DEN(DIE) KOMPRESSOR(EN) EINSCHALTEN

FOR THE FIRSTSTART OR AFTER ALONG TIME OUT OF
VOLTAGE PUT THE MACHINE ON LIVE 24 HOURS BEFORE

DE COURANT PROLONGÉE, METTRE LA MACHINE SOUS

COMPRESOR SCROLL.

COMPROBAR SENTIDO DE GIRO

COMPRESSEUR SCROLL.

VÉRIFIER LE SENS DE ROTATION

SCROLL COMPRESSOR.

CHECK SENSE OF ROTATION

COOLING mode

HEATING mode

Compressor

Suction pressure