Sterling SCW Series installation manual Control Nozzle, Control Probe, Chilled Water Manifold

4-11 Control Nozzle

All SCW Series chilling station evaporators have two control nozzles. The flow switch, freezestat, and flush port are located in the control nozzle. Pressure gages are mounted in the control nozzles to aid in achieving proper flow through the evaporator and balancing flows.

Pressure drop between evaporator entering water pressure and evaporator leaving water pressure can be converted to gallons per minute using the pressure drop charts below.

Model		Water Side Pressure Drop
	Condenser (each)		Evaporator (each)
Number
	Flow (gpm)	PD (psi)	Flow (gpm)	PD (psi)
SCWW/R60	91	4.0	72	5.3
SCWW/R75	102	4.7	90	4.5
SCWW/R90	117	4.4	107	5.6
SCWW/R100	150	5.5	123	3.9
SCWWR115	166	4.3	140	3.0
SCWW/R145	196	4.1	175	4.8
SCWW/R165	219	4.1	200	4.6
SCWW/R195	278	4.7	232	6.0

4-12 Control Probe

Two control probes sense temperatures. One probe measures the temperature of the hot well and the other does the same for the cold well of the reservoir. These temperatures are used by the PLC controller to sequence the compressors, based on load.

4-13 Chilled Water Manifold

The chilled water manifold allows one-point connections of TO PROCESS piping. The Sch. 40 steel piping includes butterfly valves at each evaporator for flow balancing and circuit isolation; optional pressure gauges can be installed.

4-14 Optional Condenser Water Manifold

The optional condenser water manifold allows one-point connection of TO TOWER (drain) and FROM TOWER (city water) piping. Sch. 40 steel include butterfly valves for each condenser.

Page 32 of 77 SCW Series Central Chilling Stations