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Extra resources for Refrigerating Systems
The container valve should be closed and capped when the container is not in use. The quantity of refrigerant stored should not exceed 200 kg, excluding refrigerants stored in components forming part of the system. 1 Introduction Absorption equipment used in building services applications ranges from small unitary gas powered systems to large combined heat and power ( CHP ) installations, which use steam or diesel/gas turbine exhaust gases as their energy source. The majority of air conditioning applications use lithium bromide/water as the working fluids, but occasionally ammonia/water solutions are used.
The aim is to provide conditions which would lead to a drop in condenser pressure to establish that the control devices operate to maintain condensing pressure at the level specified. (a) Re-check the compressor lubricant level. Ensure that the compressor crankcase heater is operating, so that the lubricant level is not high due to refrigerant distilling into the lubricant. Where low, wait a further three or four hours to see whether returning lubricant restores to the proper level. Where the level remains low, further lubricant should be added to maintain the correct level.
The charging operations are usually carried out on-site. In addition, cleanliness, the state of the system, mechanical and electrical components must be checked. Small, gas powered unitary absorption units are likely to be delivered to site fully charged. 3, with reference to BSRIA AG1/2001: Pre-commission cleaning of pipework systems(15). 3 (a) Check that the unit is correctly installed and level. (b) Check that either the steam and condensate or hot water piping system is complete with pressure gauges, thermometers and test points as specified, or that the natural gas distribution pipework is complete, together with all necessary safety devices and fittings.