ZILMET ZELA Commercial Expansion Tanks Instruction Manual
- June 14, 2024
- ZILMET
Table of Contents
INSTALLATION & OPERATION
TYPE: COMMERCIAL PRE-PRESSURIZED EXPANSION TANKS. ASME AND NON-ASME.
MODELS: ZELA, ZETA (HYDRONIC EXPANSION) ZTXA, ZTTA (THERMAL EXPANSION)
Date: 10/2021
VESSEL DESCRIPTION
Zilmet Commercial Expansion Tanks are ASME constructed, pre-charged expansion tanks. They are designed to absorb the expansion forces and control the pressure in heating/cooling systems (ZELA AND ZETA) and potable hot water system (ZTXA AND ZTTA). The system’s expanded water is contained in a heavy- duty bladder or a diaphragm/liner assembly preventing tank corrosion and waterlogging problems.
CONSTRUCTION
Shell: Carbon Steel Bladder/Diaphragm: Heavy duty butyl Exterior: Primer paint
PRECHARGE
Factory precharge: 40psig (all models)
REPLACEABLE BLADDER STYLE WITH SYSTEM CONNECTION ON BOTTOM AND BLADDER ACCESS
COVER ON TOP FIXED DIAPHRAGM STYLE WITH SYSTEM CONNECTION ON TOP
Visually inspect tank for damage, which may occur during transit.
Factory pre-charge pressure may not be correct for the installation.
Tank MUST be pre-charged to system operating pressure BEFORE placing into
operation. Remove pipe plug covering the valve enclosure. Check and adjust the
charge pressure by adding or releasing air for each application.
If the system has been filled, the tank must be isolated from the system and
the tank emptied before charging. This ensures all fluid has exited the
bladder and proper charging will occur.
If the pre-charge adjustment is necessary, oil and water free compressed air
or nitrogen gas may be used. Check the pre-charge using an accurate pressure
gauge at the charging valve and adjust as required. Check air valve for
leakage. If evident, replace the Schrader-type tire valve core. Do not depend
on the valve cap to seal the leak. After making sure air charge is correct,
replace pipe plug over charging valve for protection.
Set tank in place and pipe system connection to system on the cold water inlet
side of the heater. Be sure to include isolation valve(s) and drain. Do not
loosed nuts on cover plate this will result in loss of pre-charge. Cover
plate should only be removed when replacing bladder, and then only after the
tank has been bled to zero gauge pressure.
Purge air from system BEFORE placing tank into operation. All models have
system water contained inside bladder.
When filling the system with water, open valves to tank to ensure that any
residual air in the tank is displaced by water.
Measure and record the pre-charge annually to ensure proper system protection
and long-life for the vessel. Keep precharge log with the vessel.
400 Frenchtown Road, East
Greenwich, Rhode Island 02818
P:401-884-4943
F:401-287-4951
[email protected]