What should the transfer valve be set to for a sprinkler system only?

The appropriate setting for the transfer valve in a sprinkler system is the volume/capacity position. This setting ensures that the water supply to the sprinkler system is optimized for volume and flow rate, which is crucial for maintaining adequate pressure and coverage throughout the system.

In volume/capacity position, the system can effectively deliver a steady flow of water necessary to activate the sprinklers and sustain their operation during a fire event. This contrasts with other settings which may prioritize pressure or flow in ways that are not ideal for the consistent water delivery required by a sprinkler system.

The pressure position would typically be used in situations where maintaining a specific pressure is paramount, which is not the primary focus for sprinkler systems that require a broader volume of water to operate efficiently. The flow position is more suited for conditions where specific flow requirements need to be met, rather than ensuring a sustained volume. Lastly, the emergency position is usually reserved for critical situations where immediate action is required, rather than normal operations of sprinkler systems.