Carrier 42D Series Installation, Start-up And Service Instructions Manual

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Carrier 42D Series Installation, Start-up And Service Instructions Manual Manual pdf 53 page image

53Table 5 — Piping Components (cont)LEGEND*Check all system component pressure ratings (coils, values,pumps, etc.) with manufacturer and any applicable local or nationalpiping codes prior to specifying system pressure rating.NOTES:1. Motorized 2-way valves have a maximum close-off differentialof 25 psi.2. Motorized 3-way valves have a maximum close-off differentialof 10 psi.SYMBOL/SKETCH DESCRIPTION CV FACTOR RATING* STEAMUSE1/ 2 in. 3/4 in. PSI F2-WAY MOTORIZED VALVE: Electric 2-position flowcontrol valve (open/closed). Normally closed bodywith manual override lever. Installed in supply line tounit.Application — All standard control and valve pack-ages are based upon normally closed valves (valveelectrically powered open and closed by springreturn when electric power removed). Manualoverride lever allows valve to be placed in the openposition for secondary (unit) flushing, constant waterflow prior to start-up, etc. Manual override is auto-matically disengaged when valve is electrically acti-vated. Consult factory for normally open valveapplications.2.3 2.3 300 200YES15PSIMAX.3-WAY MOTORIZED VALVE: Electric 2-position flowcontrol valve (closed to coil/open to bypass or opento coil/closed to bypass). Normally closed with man-ual override lever. Installed in supply line to unit.Application — Same comments as 2-way motorizedvalve except with manual override lever engaged thevalve is open to both ports and water flow will takethe path of least resistance through the valve pack-age (not necessarily 100% through the coil).5.0 5.0300 200 N/ASERVICE2.8 2.8BYPASSMODULATING VALVE (Optional)(Non-Spring Return, Floating Point Actuator):Modulating valves are designed to control the flow inthe circuit by making incremental adjustments to theflow path within the valve.Application — To control fluid flow in fan coil units.On the 42DD,SG,SJ,SH commercial fan coil units,the factory-provided modulating valve has applica-tion restrictions. In these models, the valve packagesare located in the air stream, downstream of the coil.Due to the ambient temperature limitations of themodulating valves, the valves can be used in theunits listed above only with a 2-pipe cooling system.4.0 300 200 N/AMODULATING VALVE (Requires ETO [Engineer-ing to Order])(Spring Return): Modulating valves are designed tocontrol the flow in the circuit by making incrementaladjustments to the flow path within the valve.Application — Same comments as non-spring returnexcept when powered, the actuator moves to thedesired position, at the same time tensing the springreturn system. When power is removed for morethan two minutes the spring returns the actuator tothe normal position.4.0 300 200 N/AAQUASTAT: Water temperature sensing electricalswitch.Application — Clips directly on nominal size 1/ 2 in. or3/ 4 in. copper tubing for water temperature sensing.Must be correctly located for proper controloperation.Cv — Coefficient of VelocityDX — Direct Expansion