B&D Mfg HSS - Manual (Page 8)

8
DIAGNOSTICS
Water runs out of the top of the HSS
®
Buffer Tank
1. Air in zones will cause water to over flow when pumps are shut off.
2. A water line leak above the height of the Buffer Tank could cause air
to enter and allow the water to run out.
3. If the HSS
® ® ® ®
Buffer Tank was filled during the air conditioning season
and then operating in the heating season, the water level can rise and
overflow.
4. A properly purged system will result in less than 2"of water level
movement between pumps running and pumps not running. If
movement is greater than 2" air is still present in the system.
Water level continues to drop in the Buffer Tank
1. If it is a new install as air continues to purge the water level will
drop. This process should not last much over a few days of operation.
2. During the heating season and going into the cooling season the
water level may drop but should remain near that level.
3. Possible leak in the hydronic loop or in the heat pump loop.
Water will not circulate on the hydronic zone side
1. Check that all isolation valves are turned on.
2. Check that all pumps are set with the arrow up.
3. Power is at the HSS
® ® ® ®
Flow Control.
4. Air has been purged out of all air handlers.
5. Pumps have a sufficient pump curve to meet the needs of the zone.
6. A zone thermostat may not be calling for heat.
The lid will not come off of the Buffer Tank
1. The lid was installed to tight originally.
2. The purge valve was not opened to the atmosphere.
The Heat Pump will not run but the zone pumps are operating
1. The Digital Aqua Stat not programmed correctly.
2. The water temperature is at a point that all temperatures are satisfied.
Note: When filling a HSS
® ® ® ®
Buffer Tank with 40°F – 60ºF water
the cooling set point may need to be lowered to start the heating
cycle. Once water temperature is above 70ºF the cooling set point
should be reset to original setting.
Warning: HSS
®
Buffer Tank is a non-pressurized unit and should never
be pressurized.