HTP Superstor GL-50 - Troubleshooting Guide

lp-181 Rev. 003 Rel. 008 Date 8.21.18
9
Troubleshooting
No Hot Water Not Enough Hot Water
Problem Possible Solution Problem Possible Solution
Zone valve not opening Open manually to replace Zone valve restriction 1” full bore replace zone valve
Circulator not operating Check or replace Circulator arrow reversed Reverse circulator
Tank control set too low Raise tank temperature* Tank temperature too low Raise tank temperature*
Control set too low Raise control temperature Boiler temperature too low Raise boiler temperature
Wiring incorrect Check wiring Boiler sized too small Check sizing chart
Tank control failure Replace control Tank sized too small Check sizing chart
Zone valve failure Replace valve Demand ow rate too high
Install mixing valve. Raise tank
temperature
Circulator failure Replace circulator Air trap in loop
Purge air
Install ow regulator
Air trap in loop Purge air
Heat and tank come on together
Check wiring or set indirect as
priority over heating
Draw tank down and lower ther-
mostat. Recheck.
Not enough space heat
Boiler sized too small.
Consult chart.
Slow recovery Circulator head capacity too low
T&P Valve Discharges Hot Tubs, Spas, Multiple Showers, High Demand
Problem Possible Solution Problem Possible Solution
Tank temperature too high Lower tank temperature Pressure too low Check line pressure for restriction
Water expands when heated Install expansion tank Tank recovery slow Slow startup boiler. See chart
Water pressure too high
Install pressure reducing
valve
Not enough hot water
Boiler sized too small. See chart
Check ow rate. Compare to
chart
Demand too great. Check ow
rates and compare to chart.
Install mixing valve and/or ow
restricting valve and raise tank
and boiler temperature.*
Table 4 - Troubleshooting - *See scald warning below.
If draining of the storage tank is necessary, open the T&P valve or
a hot water tap to prevent vacuum buildup in the tank and piping.
The risk of scald injury increases as you increase water
temperature. Use a water tempering or mixing valve and extreme
caution when using hot water to avoid scald injury. Consult codes
for conformance. Failure to follow the instructions in this warning
statement could result in serious personal injury or death from
scalds.