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AQUA PLUS indirect-fired water heaters — Product Manual
Troubleshooting
(continued)
• Is the circulator between the boiler and the water heater properly sized to provide enough flow for maxi-
mum BTU transfer? Check the table below:
Pipe size Flow, GPM MBH Pipe size Flow, GPM MBH
¾” 1 to 4 50 to 100 1 ½” 14 to 22 200 to 450
1” 4 to 8 100 to 180 2” 22 to 45 300 to 650
1 ¼” 8 to 14 160 to 300
3 Check component parts.
• Is the domestic water thermostat functioning properly?
• Check the water heater thermostat (requires an electrical meter).
1. Disconnect the field wiring to the water heater thermostat terminals.
2. Turn the thermostat knob to the highest setting — clockwise — to initiate a call for heat.
3. Check for continuity across the water heater thermostat terminals. On a call for heat, these contacts
should closed.
4. Continue checking for continuity while turning the thermostat knob to the lowest setting — counter
clockwise — to satisfy the call for heat. The contacts should open, breaking the continuity.
5. If any of these steps fail, replace the thermostat.
• Is the thermostat setting too low?
• If the thermostat setting is too low, the boiler may not have the opportunity to deliver the maximum
BTU’s required to completely heat the entire volume of water stored in the tank.
• During a call for heat by the water heater, does the boiler circulator begin pumping, does the zone valve open,
does the boiler fire? Check every component in the system to ensure they are properly functioning.
Insufficient hot water (continued)
Part number GL-E223-ADOC 0311
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