Fujitsu UTY-RNRGZ5, Operation Manual

INTRODUCTION

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SAFETY PRECAUTIONS

•  The “SAFETY PRECAUTIONS” indicated in the manual 

contain important information pertaining to your safety. Be 

sure to observe them.

WARNING

This mark indicates procedures 

which, if improperly performed, 

might lead to the death or serious 

injury of the user.

In the event of a malfunction (burning smell, etc.), imme-

diately stop operation, turn off the electrical breaker, and 

consult authorized service personnel.
Do not repair or modify any damaged cable by yourself. Let 

the authorized service personnel to do it. Improper work 

will cause an electric shock or a fire.

When moving, consult authorized service personnel for 

uninstallation and installation of this unit.
Do not touch with wet hands. It may cause an electric 

shock.
If children may approach the unit, take preventive mea-

sures so that they cannot reach the unit.
Do not repair or modify by yourself. It may cause a fault or 

accident.

Do not use flammable gases near the unit. It may cause a 

fire from leaking gas.

Dispose of the packing materials safely. Tear and dispose 

of the plastic packing bags so that children cannot play with 

them. There is the danger of suffocation if children play 

with the original plastic bags.
This appliance is not intended for use by persons (including 

children) with reduced physical, sensory or mental capa-

bilities, or lack of experience and knowledge, unless they 

have been given supervision or instruction concerning use 

of the appliance by a person responsible for their safety.

Children should be supervised to ensure that they do not 

play with the appliance.

CAUTION

This mark indicates procedures 

which, if improperly performed, 

might possibly result in personal 

harm to the user or damage to 

property.

Do not set vessels containing a liquid on this unit.

Doing so will cause heating, fire or electric shock.

Do not expose this unit directly to water. Doing so will 

cause trouble, electric shock or heating.
Do not place electrical devices within 1 m (40 in) of this 

unit. It may cause malfunction or failure.

Do not use fire near this unit or place a heating apparatus 

nearby. It may cause malfunction.
Do not touch the switches with sharp objects. Doing so will 

cause injury, trouble, or electric shock.
Do not insert articles into the slit parts of this unit. Doing so 

will cause trouble, heating, or electric shock.

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SYSTEM OUTLINE

1 Terminology

System related terms (♦ is for VRF system)

(a) 

VRF system ♦:

VRF (Variable Refrigerant Flow) is a large multi-split 

system that effectively air conditions a wide variety of 

spaces from large buildings to personal residences.

(b) 

Other system:

Multi-split or single-split type air conditioning system 

other than VRF system.

(c) 

Heat recovery system ♦:

The indoor unit connects to the outdoor unit via an RB 

unit in this system. RB units of single type and 4-sys-

tem multi type are available. When a certain RB Group 

indoor units is performing cooling operation, other RB 

Group indoor units can perform heating operation. 

Please refer to (e) for RB Group. An indoor unit con-

nected to an outdoor unit without going through an RB 

unit are for cooling only.

(d) 

Heat pump system:

This is  standard system. In this system, the indoor units 

cannot perform the cooling operation and the heating 

operation at the same time.

(e) 

RB Group [for heat recovery system] ♦:

A group of indoor units connected to a single type RB 

unit or each system of a multi type RB unit. In the RB 

Group, the indoor units cannot perform cooling opera-

tion and heating operation at the same time.

(f) 

R.C. Group (Remote Controller Group): 

This forms a group by connecting indoor units by remote 

controller cable. One indoor unit which is ungrouped is 

an R.C. Group, too. It is the minimum unit of operation.

(g) 

Refrigeration system:

This is a system composed of indoor units and outdoor 

units connected by the same refrigerant piping.

(h) 

System ♦:

This is 1 or 2 or more refrigerant systems connected by 

the same transmission cable.

(i) 

Central controller ♦:

A central  remote controller can control multiple R.C. 

Groups. There is a system controller, Touch panel con-

troller, and a central remote controller.

(j) 

Standard remote controller:

A standard remote controller can control 1 R.C. Group 

only. This unit corresponds to this. This unit cannot be 

used together with a 3-wire remote controller. A wireless 

remote controller can be used together with this unit.

(k) 

Custom Auto:

Set both the cooling and heating temperatures. Dur-

ing the Custom Auto mode operation, when the room 

temperature exceeds the set temperature for cooling, 

the cooling operation is performed, and when the room 

temperature falls below the set temperature for heating, 

the heating operation is performed. (It can be used only 

when the setting of the indoor unit compatible with this 

function is valid.)

(l) 

Deadband:

The deadband is the minimum value of the difference 

between the set temperature for cooling and the set 

temperature for heating (= cooling set temperature - 

heating set temperature) in Custom Auto mode. The 

difference between the set temperature for cooling and 

heating in Custom Auto mode cannot be smaller than 

the deadband. The deadband is set in the indoor unit. To 

change this, consult an authorized service personnel.

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