Table 5 — Piping Components (cont)
SYMBOL/SKETCH | DESCRIPTION | CV FACTOR | RATING* | STEAM | |||||
1/ | 2 | in. | 3/ in. | PSI | F | USE | |||
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| 4 |
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| control valve (open/closed). Normally closed body |
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| with manual override lever. Installed in supply line to |
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| unit. |
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| Application — All standard control and valve pack- |
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| ages are based upon normally closed valves (valve |
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| YES | |
| electrically powered open and closed by spring |
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| 15 | ||
| return when electric power removed). Manual | 2.3 | 2.3 | 300 | 200 | ||||
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| override lever allows valve to be placed in the open |
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| MAX. | ||
| position for secondary (unit) flushing, constant water |
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| flow prior to |
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| matically disengaged when valve is electrically acti- |
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| vated. Consult factory for normally open valve |
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| applications. |
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| 5.0 | 5.0 |
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| control valve (closed to coil/open to bypass or open |
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| to coil/closed to bypass). Normally closed with man- |
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| ual override lever. Installed in supply line to unit. | 2.8 | 2.8 |
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| Application — Same comments as |
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| BYPASS |
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| valve except with manual override lever engaged the |
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| 300 | 200 | N/A | ||
| valve is open to both ports and water flow will take |
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| the path of least resistance through the valve pack- |
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| age (not necessarily 100% through the coil). |
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| MODULATING VALVE (Optional) |
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| Modulating valves are designed to control the flow in |
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| the circuit by making incremental adjustments to the |
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| flow path within the valve. |
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| Application — To control fluid flow in fan coil units. | 4.0 | 300 | 200 | N/A |
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| On the 42DD,SG,SJ,SH commercial fan coil units, | ||||
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| tion restrictions. In these models, the valve packages |
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| are located in the air stream, downstream of the coil. |
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| Due to the ambient temperature limitations of the |
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| modulating valves, the valves can be used in the |
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| units listed above only with a |
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| MODULATING VALVE (Requires ETO [Engineer- |
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| ing to Order]) |
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| (Spring Return): Modulating valves are designed to |
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| control the flow in the circuit by making incremental |
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| adjustments to the flow path within the valve. |
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| N/A |
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| Application — Same comments as | 4.0 | 300 | 200 | |
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| except when powered, the actuator moves to the |
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| desired position, at the same time tensing the spring |
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| return system. When power is removed for more |
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| than two minutes the spring returns the actuator to |
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| the normal position. |
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| AQUASTAT: Water temperature sensing electrical |
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| switch. |
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| Application — Clips directly on nominal size 1/2 in. or |
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| 3/4 in. copper tubing for water temperature sensing. |
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| Must be correctly located for proper control |
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LEGEND
Cv — Coefficient of Velocity
DX — Direct Expansion
*Check all system component pressure ratings (coils, values, pumps, etc.) with manufacturer and any applicable local or national piping codes prior to specifying system pressure rating.
NOTES:
1.Motorized
2.Motorized
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