Timed electric condensate drain (solenoid)

2/2-way solenoid opened for a set duration at a set interval to dump condensate from the receiver, dryer or separator.

Also called: timer drain · solenoid drain valve · EDV

Normally closed — fails closed on power loss, so condensate backs up rather than blowing air.

How it works

A repeat-cycle timer energises a normally-closed 2/2 solenoid. Open time and interval are adjustable. Simple and cheap, but it dumps compressed air with the water — the reason zero-loss drains exist.

Coil resistance (typical, cold DC)

Typical values for the stated wattage class. Always compare against the coil tag. Open circuit = burnt winding; near 0 Ω = shorted turns.

Specifications

Typical timer range

Interval 0.5 – 45 min, duration 0.5 – 10 s

Port

1/4" – 1/2" NPT

Orifice

2 – 5 mm; use a strainer upstream

Parts you can order

• Generic / OEM

  Timed electronic drain valve (timer + solenoid)

  1/2 in. NPT timer drain kit

  $60 – $180
• JORC

  LOCK'N LOAD timer drain

  LOCK'N LOAD

  $180 – $380
• Ingersoll Rand (OEM)

  Electronic condensate drain (EDV / ELS)

  Serial-specific (IR parts portal)

  $190 – $620

Field test procedure

1. Ohm the coil against its tag voltage using the table above.
2. Force a manual test cycle: no click and no discharge with correct voltage present = failed coil or seized armature.
3. Discharges air but no water = the drain leg is plugged upstream, or the interval is far too short.

Symptoms & probable causes

• Continuous air blow
  Debris on the seat or a failed timer output stuck on.
• Water carryover downstream
  Drain not opening, plugged strainer, or interval too long.