Nibe CLIMACOOL UCR 30, Installation, Operation & Maintenance Manual

15

www.climacoolcorp.com

The power for all modules is taken from a suitable circuit 

breaker/fused disconnect power supply within the main 

panel . The electrical service enters the individual modules 

through  the  top  into  the  module’s                               control  panel  enclosure . 

Proper grounding of the module is mandatory . Before 

carrying out any electrical work, confirm that the main 

supply is isolated . A typical power wiring is located on page 

28 – Power Distribution Drawing . Knockouts are provided . 

Do not drill into cabinet as shavings can damage electronic 

components . The power for all individual modules must be 

in compliance with all local and national codes .

CoolLogic

 Control System Wiring

A separate 115 volt power supply is required to power the 

CoolLogic

 master control panel . Communication between 

the master control panel and chiller modules requires a 

simple two-conductor 22 AWG shielded cable rated at 60°C 

minimum, daisy chain connection . 

Control wiring cannot be 

installed in the same conduit as line voltage wiring or with 

wires that switch highly inductive loads such as contactor 

and relay coils. 

Refer to the Power Distribution Drawing on 

page 28 of this manual for more information . All wiring must 

be in compliance with all local and national codes . 

ARC156 Wiring Specifications

The table on the next page lists the specifications for 

ARC156 wiring . The wire jacket and UL temperature rating 

specifications provide two acceptable alternatives. Halar 

has a higher temperature rating and a tougher outer jacket 

than SmokeGard, and it is appropriate for use in applications 

where there are concerns about abrasion . Halar is also less 

likely to crack in extremely low temperatures . 

NOTE: 

Use the specified type of wire and cable for 

maximum signal integrity . 

Electrical Phase Sequencing

Proper clockwise rotation for scroll compressor motors 

is important to prevent damage to the compressors . 

ClimaCool recommends the use of a phase sequence 

indicating instrument following the manufacturers 

directions . An alternative is to “bump test” the compressors 

one at a time with pressure gauges attached to the high and 

low gauge ports of the compressors to check for proper 

rotation . Energize the compressor for a few seconds to 

ensure the discharge pressure gauge increases significantly. 

If the discharge pressure does not increase, proper 

rotation is reversed . Compressor rotation can be reversed 

by opening the main electrical disconnect and switching 

any two of the main power supply leads feeding that 

compressor’s contactor .

Proper Voltage Balance

Occasionally, in three phase circuits, a voltage imbalance 

occurs between phases . It is not recommended to operate 

equipment when an imbalance greater that 2% occurs . This 

causes motors to run at high temperatures and may affect 

their longevity . The following example describes how to 

calculate the average voltage of the three phases to see if 

the imbalance is greater than 2% .

Example:

  Line 1 = 226v  Line 2 = 230v  Line 3 = 228v

             The average is: (226+230+228) / 3 = 228v

             Next,   [100(228-226)] / 228 = 0 .9%

The voltage imbalance of the three phase circuit is 0 .9% .  

This is well under the 2% range .    

Voltage/Phase Monitor

Voltage/phase monitors are factory supplied for field 

installation with the 

CoolLogic

 Master Control Panel . The 

voltage/phase monitor helps guard the chiller bank against 

voltage fluctuations, phase failure or phase reversal 

conditions which could void the warranty . The voltage/

phase monitor has three wires that connect to the main 

three phase power chiller bank input . Two low voltage 

control wires are connected to the 

CoolLogic

 Master Control 

Panel . Do not install control wiring in the same conduit 

as line voltage wiring or with wires that switch highly 

inductive loads such as contactor and relay coils . 

Note: It 

is mandatory to install one (1) monitor per bank at main 

power distribution panel to monitor voltage and phasing of 

power to the modules. See Wiring Diagram on page 17.

Electrical Connection

CAUTION/ATTENTION

Use only copper conductors for field 

installed wiring. Unit terminals are 

not designed to accept other types of 

conductors.

Utilisez uniquement des conducteurs en 

cuivre pour le câblage. Bornes de l’unité 

ne sont pas conçus pour accepter 

d’autres types de conducteurs.

WARNING/ADVERTISSEMENT

Disconnect power supply(ies) 

before servicing. Refer servicing 

to qualified service personnel. 

Electric shock hazard. May 

result in injury or death!

Debrancher avant d’entreprendre 

le dépannage de l’appareil. 

Consulter un réparateur qualifie 

pour le dépannage. Risque de 

choc électrique. Résiltat de mai 

dans dommages ou la mort!

CAUTION/ATTENTION

Unit to be serviced by qualified 

personnel only. Refrigerant 

system under pressure. Relieve 

pressure before using torch. 

Recover refrigerant and store or 

dispose of properly.

Conifer la maintenance à un 

technicien qualifie. Le systéme 

frigorifique sous pression. 

Décomprimer avant d’exposer 

à la flamme. Récuperer le 

frigorigene et le stocker ou le 

détrulre correctement.