Troubleshooting - Argo AT Series Installation Manual And Operating Instructions

6. Check system again for leaks. Allow circulator
pump to run until all air has been vented from the
system. A gurgling or rushing sound indicates the
presence of air.
7. The hydronic block will now start to produce heat.
As the water temperature increases, listen for air
passing through the system. Water pressure will
rise somewhat as temperature increases - this
is normal as long as the pressure remains less
than 25 PSI.
This section is meant to assist the service technician
when trouble shooting the electric boiler. As in any
trouble shooting procedure, it is important to isolate
as much as possible before proceeding. Often the
control error codes can be a great help indentifying
cause of the problem. If you suspect a wiring fault,
carefully check all external wiring and wiring connec-
tions following the wiring diagram label on the inside
of the boiler's cover. An additional wiring diagram is
included with this manual.
NOISY BOILER
1. Check water pressure of boiler. It should be be-
tween 15-25 PSI.
2. Check for air within the system.
! WARNING
Extreme care must taken when the boiler
cover is removed. Turn "OFF" all service to
the boiler. "Power On" checks should be made
by a qualified electrician.
CHANGING A HEATING ELEMENT
In the event it becomes necessary to change any
heating element, use the following procedure:
Problem
No heat when called by
thermostat and "TT" LED
is NOT lit
"Circ" LED is NOT lit when
thermostat is calling
"Safety Switch" LED is
NOT lit when thermostat
is calling
"FAULT" LED is flashing

TROUBLESHOOTING

!
Cause
Disconnect thermostat from control, momentarily place a jumper across
Thermostat
terminal "TT" & "TT." If circulator starts, trouble is in thermostat.
Confirm control's On/Off switch is in "ON" position, check 15A circuit breaker
No power to board
or fuse.
Check for open contact on safety's. Confirm continuity across terminals.
Safety fault
Confirm control's On/Off switch is in "ON" position
No power to board
Check for open contact on safety's. Confirm continuity across terminals.
Safety fault
Confirm control's On/Off switch is in "ON" position.
No power to board
Safety fault Refer to "Fault" codes
8. When the thermostat calls for heat, the circulator
will be energized and the indicator LED will light
up. Next, the heating elements are energized
along with the element indicator LEDs. Once the
boiler water temperature reaches the set point on
the temperature adjustment dial, the controller will
regulate the boiler by staging its elements. The
number of elements which stay on is based on
the heating demand and the set point of the boiler
water temperature. After all room thermostats are
satisfied with the heat, the controller de-energizes
the elements one after another, and then switches
the pump off after 3 minutes.
2. Close gate valves near inlet and outlet of hydronic
block.
3. Close feed line valve if using automatic fill.
4. Open drain valve and allow water to drain from
the boiler. Manual operation of the relief valve will
assist drainage by allowing air to enter.
5. Remove cabinet cover and disconnect the two
wires attached to the effected heating element.
6. Remove the four bolts that secure the heating
element to the casting and pry the element loose.
Take note of the markings on the element flange
to assure proper reinstallation.
7. After the element has been removed, carefully
clean any remaining gasket material from the
casting surface. Take care not to scratch or score
this surface.
8. Install new gasket and heating element
while assuring that the element is correctly
positioned.
9. Close relief valve. Open feed line valve and
check for leaks. Open gate valves. Install heating
element wires and cabinet cover.
10. Refer to "Startup and Seasonal Maintenance"
for proper purging of air prior to energizing the
heating elements.
Solution
16