How To Install Your Steam Coil - Page 2

• Trap all coils
• Use only traps such as the inverted bucket or float and thermostatic which drain continuously. When steam to the coils is modulated, a float and thermostatic trap is preferred.
• Install a dirt pocket prior to the steam trap. You may also install a gate valve at the bottom of the dirt pocket to facilitate drainage during shutdown periods.
• Use the same size trap on all coils when they are in parallel across the duct opening. Coils mounted in series (one behind the other in the direction of the airflow) typically have lower condensing rates at the downstream end of the system. Size traps to handle the maximum calculated load for individual coils. Avoid oversizing. Consult General Equipment if you need assistance.
• Modulating control valves are best used with gravity flow vented condensate return systems. If the condensate return system is overhead or pressurized, pumping traps or the Posi-Pressure Coil Controller System is highly recommended.
• Install filters at the coil inlet if possible. Simple filter systems permit easy cleaning or replacement and ensure efficient operation.

Operation

Once coils are installed properly, their performance and service life depend on a few simple guidelines for maintenance and operation.

1. To prevent plugging of tubes, clean the piping system and blow down all strainers prior to initial startup.
2. On startup, feed steam to the coils slowly to avoid thermal shock loadings.
3. Make sure the steam has been on for a minimum of 15 minutes prior to starting fans or opening dampers.
4. Make sure operating pressures are kept within design limits.
5. During initial startup, tighten all bolted connections once the system stabilizes at operating temperature.
6. To provide maximum freeze protection, maintain a minimum steam pressure of 5 psig to coils exposed to air temperature below 40°F (5°C). If this is impossible, consult your Representative.
7. Drain during shutdown to prevent internal corrosion.

Maintenance

If filters are installed, clean regularly to maintain adequate airflow across the coils and to keep fan loadings at design.

If filters are not used, inspect and clean coils periodically. Clogged filters and plugged coils have the same result.