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6.3 Troubleshooting
Trouble
No air discharge
2. Internal piping pressure is more than
3. Top of cap stopper comes off.
Valve seat
1. Foreign substances exist on the valve
leakage.
External leakage
6.4 Disassembly
1. Stop driving of heat source (hot water boiler, electrical water heater, etc) and pump.
2. Remove pressure inside piping.
3. Remove valve seat with spanner (nominal size: 12mm) (see Fig.3).
4. By removing valve seat, seal surface of valve and valve seat can be cleaned. Clean off scale and dust
adhering to valve and valve seat with waste cloth. (see Fig. 4)
Fig.3
5. After cleaning, apply O ring (S9) to ditch of valve seat and screw it, then tighten it with spanner. O ring and
elbow cap are treated as consumable supply (Tightening torque: approximately 3 N・m).
Cause
1. It is difficult for air to accumulate.
the appropriate value.
disc and seat.
1. Damage or deformation of the body or
cover due to abnormal pressure rise.
2. O ring is damaged.
Elbow cap
Valve seat
1. Install it in a place where air tends to
accumulate.
2. Lower the internal piping pressure, or
replace the valve by one for high
pressure.
3. Put the cap stopper. [See 4.2 Pic. 1, 2]
1. Remove and clean the valve disc and
seat. [See 6.4 Disassemble]
1.
Replace the product.
2.
Replace the O ring.
Valve
O ring
Fig. 4
8
Remedy
Valve seat
■EPDT-273b■
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