Инструкция на Чиллеры Lennox серии MES, GEN бренда Lennox

INSTALLATION OPERATING &

MAINTENANCE MANUAL CHILLERS

1. RECEPTION OF EQUIPMENT ON SITE

1.1 VERIFICATION OF EQUIPMENT DELIVERED 1.1.1 TRANSPORT Carriage of the equipment is at the risk and peril of the recipitent, and the latter is obliged, after delivery and unpacking, to : - Check the external appearance of the equipment, - Check the absence of any shock damage or deformation, 1.1.2…

1.2 STORAGE

When the units are delivered on site, they are not always started up immediately and are placed in storage. If the units are stored for a medium or long period of time, we recommended the following : - To make sure of the total absence of water in the water circuits, - To keep the coil protection…

In locations exposed to frost, the supporting surface, if the unit is installed on the ground, must be built on concrete stakes extending downwards beyond the normal depth of frost. It is always advisable to build a supporting surface detached from the general building structure to avoid…

2.4 WATER CONNECTIONS

2.4.1 WATER CONNECTIONS - EVAPORATOR The water circulating pump must be installed upstream so that the evaporator will be subjected to positive pressure. Entering and leaving water connections are indicated on the certified drawing sent with the unit or shown in the sales brochure. A drainage plug…

2.4.6 FLOW SWITCH

A flow switch must be installed on the evaporator water inlet or outlet, so as to enable detection of water flow through the heat exchanger before the unit is started up. This will protect the compressors against any eventual liquid slugging during the starting phase and prevent accidental ice…

2.7 UNITS MOUNTED ON RECEIVERS

2.7.1 CONNECTION OF UNITS ON RECEIVERS Connections between the unit and the condenser must be made by a qualified refrigeration engineer and require several important precautions. In particular, the shape and dimensions of the hot gas lines must be carefully designed to ensure proper oil return in…

Best results are obtained with a vacuum down to 1 mmHg. To get down to this level at normal temperatures, i.e. 15 °C, it is often necessary to leave the pump running for 10 to 20 hours. The duration of pump operation is not a factor of efficiency. The pressure level must be checked before the unit…

3. START UP

3.1 PRELIMINARY CHECKS Before proceeding with start up, even for a test of short duration, check the following points, after having made sure that all the valves on the refrigeration circuit are fully open (discharge valves and liquid valves). Starting up a compressor with the discharge valve closed…

8) On units with air cooled condensers, check for correct operation of the fans and that the protective grilles are in good condition. Make sure that rotation is in the right direction. 9) Before making any electrical connections, check that insulation resistances between power supply connection…

These verifications should be made as quickly as possible with a stable cooling load, i.e. the cooling load of the installation should be the same as the capacity developed by the unit. Measurements taken without heeding this condition will result in unuseable and probably wrong values. These…

Crankcase heater

Every compressor is fitted with a single phase crankcase heater that is activated when the compressor stops to ensure separation of the refrigerant and the compressor oil. It is therefore powered up when the compressor is not running. NB : MANEUROP Scroll and reciprocating +6°C ambient type…

Fan overcurrent protection

Circuit breaker designed to stop the fan motors in the event of phase overcurrent in relation to the permitted value. Compressor motor overcurrent protection : Circuit breaker designed to protect each motor winding against accidental overcurrent. Indicator lights: The electrical control box is…

Loss of power supply

There are no problems restarting the machine after a loss of power supply of short duration (up to about one hour). If loss of power supply lasts longer than this, when power supply is resumed set the unit to "OFF" with the compressor crankcase heaters activated for as long as it takes to bring sump…

II) Self-contained units designed for - 20 °C ambients

Number of fans per circuit 750 rpm fans 750/500 rpm fans 500 rpm fans 1 dual speed 750/500 rpm motor PV1 on PHP1 GV1 on PHP2 Fan speed controller mandatory 1 750/500 rpm + 1 750 rpm motor PV1 on PHP1 GV1 on thermostat V2 on PHP2 V1 with fan speed controller V2 on PHP1 3 1 750/500 rpm + 2 750 rpm…

5. MAINTENANCE

The following maintenance instructions form a part of the operations required for this type of equipment. However, It is not possible to give fixed and precise rules for permanent maintenance procedures capable of keeping all units in perfect operating condition since too many factors depending on…

Each sightglass is fitted with a humidity indicator. The colour of the element changes according to the level of humidity in the refrigerant, but also according to temperature. It should indicate "dry refrigerant. If it shows "wet" or "CAUTION", contact a qualified refrigeration technician. CAUTION…

5.3 CLEANING THE CONDENSER

5.3.1 AIR COOLED CONDENSERS Clean the coils either with a vacuum cleaner, cold water, compressed air, or with a soft brush (non metallic). On units installed in a corrosive atmosphere, coil cleaning should be part of the regular maintenance program. On this type of installation, all dust gathered on…

6. TROUBLESHOOTING / REPAIRS

6.1 LIST OF THE MOST COMMON PROBLEMS PROBABLE CAUSE RECOMMENDED ACTION - No power supply - Check main power supply and switch positions - Compressor motor burnt out - Replace - Low voltage reading on voltmeter - Voltage too low - Contact power company - The system does not start up - Breaker tripped…

B) THE COMPRESSOR SHORT

CYCLES ON LOW PRESSURE SAFETY SWITCH TRIP OUT - Low pressure safety switch trip out - Check low pressure safety switch differential - Normal operation with too freqquent starts and stoppages due to action of the low pressure safety switch. Bubbles in sightglass.. Or, normal compressor operation, but…

E) COMPRESSOR CUTS OUT

ON OIL PRESSURE SAFETY SWITCH - Oil pressur switch tripped - Check operation of the oil pressure safety switch - Oil level in sightglass is too low - Oil pressure too low - Check the oil level in the sightglass on the crankcase, check the cleanliness of the oil filter, check the oil pump - Visible…

- Power supply on two phases only

- Check power supply voltage - Faulty motor windings - Replace the compressor - Compressor seized - Replace the compressor - Faulty windings - Replace the compressor - Mechanical problem - Replace the compressor J) THE COMPRESSOR IS NOISY - If starting on a single winding on compressors fitted with…

TOO LOW - Water is very cold at condenser outlet - Condenser water flow too high or water temperature is too low - Bubbles in sightglass - Low refrigerant charge - Adjust the pressure operated water valve or the thermostat on the cooling tower - Repair the leak and add refrigerant M) SUCTION…

CONTROL DEVICES

Operation By reacting to compressor discharge pressure, the high pressure switch monitors efficiency of the condenser. Poor efficiency, the result of an excessive condensing pressure, is usually caused by : - A dirty condenser - Low water flow - Low air flow The low pressure switch monitors the…

6.2 OPERATION AND START UP CHECK SHEET

Machine identification : _ _ _ _ _ _ _ _ _ _ _ _ _ File number : _ _ _ _ _ _ _ _ _ _ _ Year of manufacture : _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ NORMAL CONDITIONS OF USE Leaving chilled water temperature : _ _ _ _ _ _ °C Outdoor air temp. : Max : _ _ _ _ _ Power supply voltage : _ _ _ _ _ _ _ _…

6.3 REGULAR CHECKS TO BE MADE

CHILLER UNIT ENVIRONMENT CHILLED WATER CIRCUIT VALUE Inlet / Outlet pressure guages for pressure drop DkPa Evaporator inlet temperature °C Evaporator outlet temperature °C Glycol concentration (1) % Flow switch operational at % débit Chilled water pump interlock [ ] Filter on water circuit [ ]…

MANUFACTURER'S RECOMMENDED INSPECTIONS

LIQUID CHILLERS WITH RECIPROCATING COMPRESSOR(S) NUMBER OF RECOMMENDED PREVENTIVE MAINTENANCE VISITS Year Start up 500 / 1000 H Visit 1 X X Major technical inspection Inspection visit 30000 H Inspection Tube analysis XX 2 X XXX 3 X XXX 4 XXX 5 X XXX 6 X XXX 7 X X(1) XXX 8 X XXX 9 X XXX 10 +10 15000…

LIQUID CHILLER WITH RECIPROCATING COMPRESSOR(S)

START UP - Check unit installation - Check water flow and water circuit ancillaries - Check safety devices - Check leaktightness - Configuration of the microprocessor based management system (if used) - Verification of operating parameters and unit performance - Transmission of the machine service…

VISITES PRECONISEES PAR LE CONSTRUCTEUR

LIQUID CHILLERS WITH SCROLL COIMPRESOR(S) NUMBER OF RECOMMENDED PREVENTIVE MAINTENANCE VISITS Year Start up Visit 500 / 1000 H 1 X X Major technical inspection Inspection visit Tube analysis XX 2 X XXX 3 X XXX 4 X XXX 5 X XXX 6 X XXX 7 X XXX 8 X XXX 9 X XXX 10 X XXX X Every year 3 times a year Every…

LIQUID CHILLER WITH SCROLL COMPRESSOR(S)

START UP - Check unit installation - Check water flow and water circuit ancillaries - Check safety devices - Check leaktightness - Configuration of the microprocessor based management system (if used) - Verification of operating parameters and unit performance - Transmission of the machine service…

MANUFACTURER'S RECOMMENDED INSPECTIONS

LIQUID CHILLERS WITH SCREW COMPRESSOR(S) NUMBER OF RECOMMENDED PREVENTIVE MAINTENANCE VISITS Year Start up 500 / 1000 H Visit 1 X X Major Technical inspection Inspection visit Tube analysis XX 2 X XXX 3 X XXX 4 XXX 5 X XXX 6 X XXX 7 X(1) XXX 8 X XXX 9 X XXX 10 +10 30 000 H visit X XXX Every year 3…

LIQUID CHILLER WITH SCREW COMPRESSOR(S)

START UP - Check unit installation - Check water flow and water circuit ancillaries - Check safety devices - Check leaktightness - Configuration of the microprocessor based management system - Verification of operating parameters and unit performance - Transmission of the machine service log 500 H /…

CHECK LIST

This check list should be filled in by the contractor to make sure that unit installation takes place according to appropriate industry practices. WARNING : Disconnect the power supply before carrying out any inspections on the unit. If the unit must be left powered up, proceed with precaution to…

GREAT BRITAIN ,

IRELAND : LENNOX INDUSTRIES LTD tel. : + 44 1604 599400 fax : + 44 1604 594200 e-mail : marketing@lennoxind.com BELGIUM : LENNOX BENELUX N.V./S.A. tel. : + fax : + e-mail : info.be@lennoxbenelux.com CZECH REPUBLIC : JANKA RADOTIN AS tel. : + fax : + e-mail : janka@janka.cz FRANCE : LENNOX FRANCE…

Инструкция на Чиллеры Lennox серии MES, GEN

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