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Pressure Drop FLOW vs. PRESSURE DROP FLOW IN U.S. GPM Pressure Drop, PSID Figure 15_2 1/2" - Flow vs. Pressure Drop Figure 14_2" - Flow vs. Pressure Drop Maintenance instructions The LTV valve is maintenance free. It does not require regular cleaning or calibration. In most installations, the 1-1/2" and 2" valves are hard piped into place and do not afford access. The 2-1/2" valve has flanged connects which allows removal. If the valve becomes unable to maintain a consistent inlet water temperature of 125°F during steady state firing conditions, replace the valve or the wax element inside the valve. WARNING The recommended maximum high temperature to the valve should be 175°F; the absolute maximum is 195°F. INS7238 Rev C 6 of 8 Notes INS7238 Rev C 7 of 8 Revision Notes: Revision A (INS7238 Rev A) reflects the addition of the 1 1/2" valve. Revision B (INS7238 Rev B) reflects the addition of the maintenance instructions. Revision C (ECO C02335) reflects the revision of FIG.’s. 1, 2, 3, 4, 6 & 8. 10/08 - Printed in U.S.A. ...

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