HTP SuperStor Ultra Indirect Fired Water Heaters - Manual (Page 34)

34
LP-83 Rev. 3.24.14
TROUBLESHOOTING
NO HOT WATER
PROBLEM POSSIBLE SOLUTION
Zone valve not opening Open manually to replace.
Circulator not operating Check or replace
Tank control set too low Raise tank temperature* (SEE NOTE BELOW)
Boiler control set too low Raise boiler temperature
Wiring incorrect Recheck wiring
Tank control failure Replace control
Zone valve failure Replace valve
Circulator failure Replace circulator
Air trap in loop Purge air
NOT ENOUGH HOT WATER
PROBLEM POSSIBLE SOLUTION
Zone valve restriction 1” full bore replace zone valve
Circulator arrow reversed Reverse circulator
Tank temperature too low Raise tank temperature* (SEE NOTE BELOW)
Boiler temperature too low Raise boiler temperature
Boiler sized too small Check sizing chart
Tank sized too small Check sizing chart
Demand flow rate too high Install mixing valve, raise tank temperature*
Air trap in loop
Purge to remove air
Install flow regulator
Heat and tank come on together
Recheck wiring or set indirect as priority over central heating.
Draw tank down and lower thermostat. Recheck.
Not enough space heat Boiler sized too small. Consult chart.
Slow recovery Circulator head capacity too low
T & P VALVE DISCHARGES
PROBLEM POSSIBLE SOLUTION
Tank temperature too high Lower temperature on tank
Water expands when heated Install expansion tank
Water pressure too high Install pressure reducing valve
HOT TUBS, SPAS, MULTIPLE SHOWERS, HIGH DEMAND
PROBLEM POSSIBLE SOLUTION
Pressure too low Check line pressure for restriction
Recovery of tank slow Slow startup boiler. See chart.
Not enough hot water
Boiler sized too small. See chart.
Check flow rate and compare to chart
Demand too great. Check flow rates and compare to chart. Install
mixing valve and/or flow restricting valve and raise tank and boiler
temperature*.
Table 10 - *See scald warning below.
When raising tank temperature, the risk of scald injury increases. To avoid scald injury, use a water tempering or mixing valve and
extreme caution when using hot water. Consult codes for conformance.