RETRIEVER I—Steam Only —Troubleshooting
6
Problem
Cause
Solution
Water in tank exceeds set
point temperature
1) Sensor is not positioned properly
2) Sensor is not wired properly
3) A solenoid valve is stuck open
4) Sensor is malfunctioning.
5) Hot water is stacking at top of tank.
1) Check sensor, use thermally
conductive puddy.
2) Check wiring of sensory, check
Honeywell recc. for type of wire.
3) Clean or rebuild solenoid valves.
4) Replace sensor.
5) Install recirculation loop.
Aquastat is calling for
heat, but piping leading to
the lower heat exchanger
is always cold.
1) Steam valve is not opening.
2) Strainer is clogged.
3) Regulator is set too low, or
malfunctioning.
1) Clean or rebuild steam valve.
2) Blow down 3/4” Y
-Strainer.
3) Set regulator or replace.
Water-side relief valve is
blowing when no potable
water is used.
1) Expansion tank missing or not
sufficiently pressurized.
2) Tank is overheating.
1) Install tank or charge tank to street
pressure.
2). See above.
Water-side relief valve is
blowing when potable
water is used.
High water pressure or water hammer
coming from main supply.
Install a pressure reducing valve on the
cold water side of the tank (expansion
tank must also be installed).
General Maintenance Notes:
1. Blow down your Y-strainers. This will lengthen the life of your solenoid valves.
2. Recharge your expansion tank. If the expansion tank loses air pressure, it’ll
become useless. Make sure you charge your expansion tank so that the air
pressure equals the water pressure coming from the street.
3. Make sure that the control stays dry. Like any electrical component, when wet
it will malfunction and will likely be destroyed.
4. If you have a hard water situation, occasionally de-lime the tank utilizing a de-
liming kit (available at most plumbing supplies).
5. DO call NATCO with questions. You can reach us at the following:
National Combustion Co., Inc.
104-11 180th Street
Jamaica, NY 11433
Ph: 718-291-8400
Fx: 718-291-6870
Email: [email protected]
