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Entrance from Queen's Road.
Air-Conditioning Plant: Func- tionally, the building is horizontally divided into three independent air- conditioning systems, one for the banking floors, one for the office floors and one for the bank welfare and tower floors.
As the bank building stands lofty and alone, it is subject to more sun radiation than buildings which are grouped together. The sun rises and rotates from east to south and thence to west, so the zoning of this building is arranged vertically. In each system, the east comprises one zone, the south one zone, the west one zone and the central and north side comprise one zone. Thus as the solar radiation hits the east side the thermostat governing that zone will automatically open up dampers through modutrol motors to give
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Looking towards the private lift to the Manager's quarters.
Another view of the main banking hall.
that zone more cold and dehumidi- fied air. As the sun rotates to the south and west, these zones will succeedingly get more conditioned air while the zone which passes into shade likewise succeedingly returns to the normal amount of designed conditioned air.
System (A) consist of a cabinet provided with direct expansion cooling coils, humidifying sprays and steam coils and is located below the lower ground floor in the basement. The cooling coils in this air con- ditioning cabinet are manufactured by the Aerofin Corp. and the re- frigeration for these are supplied by one 75 h.p. and one 25 h.p. Airtemp Radial condensing units.
The air conditioning cabinet for system (A) supplies air to four re- circulating air fan cabinets located in the basement, lower ground floor and mezzanine floor. These cabinets supply air to the basement, lower ground floor, ground floor and mez- zanine floor. A separate supply is given to the Banking Hall through ceiling registers. The above areas are divided into five zones. The underground vaults comprise one zone, the central of the building and the north side comprise one zone, the east, south and west side separate zones. The entire building is zoned in this manner.
Air conditioning system (B) con- sist of a cabinet also located in the basement and equipped with direct expansion cooling coils, humidifying sprays and steam coils. Refrigerant is supplied to the direct expansion coils by four Airtemp 75 h.p. con- densing units. The cabinet fur- nishes conditioned air to eight fan recirculation cabinets located on the first 7 floors, two cabinets being located on the first floor. System (B) supplies conditioned air to floor
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one to floor eleven inclusive con- sisting of eight zones. Air from all zones is returned through a common duct from each floor. The recir- culation air cabinets receive con- ditioned air from the air conditioning cabinet in the basement and are controlled by modulating damper actuated by a thermostat located in a representative area of the zone.
Each fan cabinet supplies a duct system which distributes air effective- ly throughout a particular zone. Air circulation is maintained at all times regardless of load. Ducts are all furred in to blend with ceiling beams or placed above suspended ceilings so as not to interfere with the architectural scheme.
Air conditioning system (C) con- ditions the upper three floors, the 12th, 13th and 14th floors and the apartment on the 15th floor. This system consist of a cabinet supplying conditioned air to three air recircula- ting fan cabinets each located in a particular zone supplied by the unit.
The cabinet is equipped with direct expansion coils, humidifying sprays and heating coils. The cooling coils in this unit are refri- gerated by one Airtemp 75
h.p. Radial condensing unit which is located on the tower roof which is really the 15th floor.
In
In each of these three systems, conditioned air is supplied through a central duct to the recirculating units and distributed to each zone by an elaborate duct system. each case, the return air is taken from each floor by a return air duct common to all floors and extending from the top of the areas down to the conditioning cabinet with mini- mum turns. The recirculating cabinets are fed from the main sup- ply duct and are located in the par- ticular areas they are to condition
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