182 Installation, Operation, and Maintenance
Part 3, Maintenance and Troubleshooting
11 Special Topics
• If you use a built-in pump, it must be suitable for external circulation of
liquid and for connection of 1/4-in. id (6.35 mm) tubing or larger.
• If you use a pressure pump, it must maintain a pressure from 1.5 to 2.5 psi.
• If you use a suction pump, the pump vacuum cannot exceed –4 psi.
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