6.
ELECTRICAL CONNECTION
6.1. GENERAL RECOMMENDATIONS
Before any work is carried out on the unit, the power supply to the unit must be switched off and the personnel working on it must be
trained and authorized.
The unit presents the following risks:
•
Risk of electric shock
•
Risk of injury from rotating parts
•
Risk of injury from sharp edges and high weights
•
Risk of injury from high-pressure gas
•
Risk of injury from low or high temperature components.
It goes without saying that all work carried out on the equipment must comply with local regulations and standards. It is understood that
all work is in accordance with best practice.
All the information for each of the power outputs is grouped in the tables below. To find the information, simply take the machine
number from the nameplate and look for it in the tables below. The "_" means that this part of the reference will not influence the
electrical part (Example: The coupling of the motors does not change the selection of the defrost resistors
6.2. RECOMMENDED SECTIONS
The choice of the size of the power cables is the responsibility of the installer. This must be done in accordance with the electrical values
of each power feeder (shown in the tables below) and the regulations of the customer's local installations.
The tables below are indicative and do not commit LENNOX EMEA to any responsibility.
Once the selection is complete, the installer should make any necessary adjustments to the cable glands.
The cable cross-sections in the tables below are calculated based on:
•
A distance of 100 m and a voltage variation <5% with a Cos-phi of 0.8
•
A copper cable with cross-linked polyethylene insulation (XLPE), on a perforated cable tray in the open air for an ambient temperature
of 40ºC
•
R2V copper cable.
Do not start the unit if the voltage drop is higher than this value.
The earth cables must be well connected and have a length greater than the phase cables. The connection to the earth of the unit is
mandatory.
6.3. INFORMATION ON UPSTREAM PROTECTIONS (CUSTOMER MANAGEMENT)
In order to protect the various power outlets, LENNOX EMEA recommends that the following types of protection be installed upstream. A
selection is given in the tables below as a guide.
Two options are available:
•
Circuit breaker protection
•
Fuse protection.
The customer must provide the necessary equipment to protect the supply lines of the various terminals from leakage currents:
•
Electrical defrost: Recommended circuit breaker C-curve with 300mA differential
•
AC fan or AC option M60: Recommended circuit breaker D-curve with a 300mA differential
•
EC fan: Recommended circuit breaker for C-curve with 300mA differential type B or Si
•
Option RVU/RVK: Recommended circuit breaker with a 300mA differential
In order to guarantee the correct operation and protection of the machine and to maintain the warranty of the fans, it is imperative to
connect the internal protections of the fans (TB-TB or CO-NC contact). As contact operation differs from one fan to another, details of
contact position are given in the table in chapter 7.1.1 "Characteristics and recommendations".
NK
23
