Tecumseh SILENSYS SILAJ2432P Instrucciones Originales página 12

SILENSYS ADVANCED HEAT RECOVERY
INSTALLATION INSTRUCTIONS
4.8 Electrical connections
Ensure the electrical supply is disconnected before
carrying out any wiring or repairs of the unit.
Ensure that there isn't any potential flammable
atmosphere after a refrigerant leakage.
All cabling on site must conform with the current legislation in the
country of installation (IEC 60204/IEC 60335).
Consider a pollution degree 3, in accordance to IEC60335, to
determine creepage distances and other safety insulation distances.
WARNING
To ensure the quality of a Tecumseh condensing unit, it is essential to:
• Check that the installation power supply voltage is compatible with
that of the condensing unit (see identification plate).
• Check the compatibility of the wiring diagram with that of the
installation.
• Size the cables (power and control circuits) according to the
specifications of the condensing unit installed.
• See table of current ratings in the Electrical Data Instructions
Appendix 8
• Ensure that the power supply to the unit is correctly protected and
earthed.
• Ensure that all electrical connections conform to the local standards
and follow recommended best practice.
• Ensure that the unit is earthed when replacing components.
Like the protector, it is vital to use the relay delivered with the
compressor, even if another model seems to be satisfactory at a given
time. All the compressors in the Tecumseh range are protected by an
external or internal protection mechanism, for which the principle is
based on a current /temperature combination. Like any protection
mechanism, it is normal for it to disconnect the compressor's power
supply outside the normal usage ranges provided by Tecumseh.
4.9. Connecting components
To connect components, refer to the wiring diagram (legend of electrical
symbols: see appendix 8).
• Connect all control and safety devices fitted to the unit.
• Secure wiring using the clips fitted to the condensing unit.
• Close the electrical box after wiring.
4.10. Heat recovery
Some Silensys® Advanced models are equipped to be connected to a
heat recovery system. For this purpose :
A. Remove the plugs and connect the refrigerant circuit to the heat
recovery system, see Appendix 5: Heat recovery function .
B. Close bypass valve (heat recovery position
C. For total heat recovery, see appendix 5 figure 3:
a) The compressor start signal can be relayed via contacts 13 and 14 of
the compressor contactor KM1.
b) The power supply to the condenser fan can be controlled via terminals
5 and 6 through the fan phase.
Tecumseh advises :
• To avoid heat loss and optimise heat recovery, insulate the discharge
pipe between the compressor and the connection as well as the
pipework between the unit and the heat recovery unit.
• To ease maintenance, add shut off valves at the inlet and outlet of the
heat recovery pipes.
The units are delivered with the bypass valve opened to allow the
condensation gases into the condensing unit heat exchanger.
Connexions diameters, see appendix 1.
12 • www.tecumseh.com
5. START UP
Our compressors are designed to operate at a maximum ambient
temperature of 46 °C. Do not exceed this temperature.
To optimize the quantity of refrigerant in the installation, respect the
rules of the art. For the different conditions of use of the compressor,
do not exceed its maximum allowable pressure PS (see identification
label).
If there is a single-walled tube between the water and the refrigerant
(e.g.: water evaporator) and if a leak occurs through this wall, the
refrigerant leaks outside and water enters the system, creating a vapour
effect. Without a safety device, the compressor will behave like a
vapour generator and the motor's heating will generate a high increase
in pressure.
The disintegration of the insulator (glass bead) on one of the
compressor's electricity supply terminals following a physical impact
may create a hole through which the refrigerant and some oil may
escape. If it comes into contact with a spark, this mix may catch fire.
Regardless of the work being carried out on the cooling system, simply
positioning the electrical unit cover correctly will limit this type of risk.
Avoid very corrosive or dusty environments. If the installation is shut
down for a lengthy period, you are strongly advised to bring the cooling
fluid into the tank when the condenser unit has one. The aim of this
operation is to avoid the refrigerant migrating to the compressor and
any concentration of fluid within the lubricant that may cause liquid
slugs during recommissioning.
5.1. Preventing leakage
All connections must be systematically checked for any leakage with an
electronic leakage detector suitable for the type of refrigerant used. A
leak test can be carried out before pulling a vacuum by using a pre-
charge of nitrogen and a leak detection aerosol (refrigerant tracers not
approved) around the joints. Do not over pressurize the system when
using nitrogen. A more accurate check using an electronic leakage
detector can be carried out after charging with refrigerant.
5.2. Pulling a vacuum
Pull a deep vacuum on the installation to about 200 microns mercury or
0,27 mBar, with a suitable vacuum pump.
We recommend that a vacuum is pulled simultaneously from both
high and low pressure sides of the system to ensure a uniform vacuum
throughout the system including the compressor and to reduce the
amount of time required to obtain the vacuum.
5.3. Refrigerant charge
), see appendix 5 figure 2.
Charge the installation using only the refrigerant for which the unit has
been designed (see condensing unit nameplate).
Charging with refrigerant will always take place in the liquid phase in
order to maintain the correct blend of zeotropic refrigerants.. Pre charge
will be realized on the liquid line. Additional charge will be conducted
gradually on the suction line until obtaining the nominal operating
mode of the installation (installation operation). See paragraph "Pre-
start check list" before powering.
NEVER START THE COMPRESSOR UNDER VACUUM, WHETHER
HBP OR LBP and ensure before starting that the compressor casing is
under positive pressure. We therefore recommend to charge slowly the
refrigerating circuit to a pressure between 4 and 5 bars if it runs with
R-455A / R-454C and to 2 bars if it runs with R-1234yf.