Pentair MT warranty Troubleshooting and Analysis Service Problems, Possible Cause What To Do

MegaTherm Commercial Pool Heating Boiler Page 13

SECTION 5.

Troubleshooting and Analysis of

Service Problems

1.For proper service and problem diagnosis of the boiler and system, the following tools are required:

a.Gas pressure test kit with range from zero to 14" W.C. Either a slack tub manometer or an accurate gas pressure gauge is acceptable with proper adaptors which will connect to the available fittings in the line and on the gas valve.

b.Electric meter(s) with the following ranges: 0 to 500 volts A.C.

0 to 1000 ohms continuity.

c.Millivolt meter with the following ranges: 0 to 50 millivolts. 0 to 500 millivolts. 0 to 1000 millivolts.

d.Tube cleaning kit consisting of reamer, stainless steel brush, speed handle and handle extensions.

e.Accurate thermometer and pressure gauge.

2.In addition, the boiler should be equipped with a thermometer with proper ranges.

	Boiler Will Not Fire
Possible Cause	What To Do
Electric Power	Check to see that main power switch
is off.	is ON. Use testing device to trace
	power to boiler junction box.
Operating or	Turn off power. Use continuity tester
safety control has	to check continuity across terminals of
opened circuit to	each operating and safety control
electric gas valve.	switch up to the electric gas valve.
	Replace defective control.
Pilot flame is out.	Relight pilot per instructions.
Manual reset	Follow instructions for start-up. Reset
device has	pilot safety and all manual reset
tripped.	safety switches.
No gas pressure to	Trace gas line to service shutoff cock.
burners.	If service cock is open, trace gas line
	to meter. If no pressure is present at
	meter, call for public utility service. If
	gas is present in heater inlet, check
	pressures in following sequence:
	(1) downstream from pressure
	regulator,
	(2) downstream from electric gas
	valve. Replace or adjust as
	necessary.
Electric gas valve	Disconnect wiring harness at gas
operator is burned	valve terminals. Check continuity to
out or shortened.	actuator coil. If open circuit or short is
	indicated, replace coil or operator.

Boiler is Pounding, Knocking,

or Emitting Steam from Relief Valves

Possible Cause	What To Do
Lower or no water	This condition is usually caused by
flow.	lack of adequate water flow through
	heater. check the following:
	1. Is the heater wired into the pump
	circuit so that the heater cannot fire
	unless the pump is running?
	2. Check to see that all valves in
	system are open to be sure that water
	can circulate through the heater and
	the system.
	3. Examine pump for clogged
	impeller.
	4. Check water filter.
Debris from system	Remove header covers. Examine all
is blocking tubes.	tubes and waterways. Use new
	gaskets when reassembling. Clean
	out tubes.
Scale has formed	This is always caused by heavy
in tubes.	mineral content of the water or
	clogged filter. Check the water
	chemistry. Replace the filter and
	clean all the internal wet surfaces.

Soot in Flueways or in Tubes, or Noxious

Fumes Indicative of Bad Combustion

Possible Cause	What To Do
Combustion air	Check air supply opening. Look for
supply to	debris in screen or louvre which
equipment room is	covers combustion air opening, or for
inadequate.	material blocking the opening.
Stack or vent is	Look for blocked stack and excessive
blocked or	number of elbows in stack or
restrictive.	excessive length of horizontal runs.
Severe down draft	Check for (1) proper vent cap on
is causing spillage	stack; (2) adequate height of stack
of flue products	above roof; (3) equipment exhausting
into room.	air from inside of building.
Gas pressure to	Check gas pressure with
burners is	manometer,and adjust with heater
excessive.	firing at full rate.
Heater not fitted	See nameplate for correct fuel.
for the fuel being
supplied.
Heater installed at	Installations at altitudes in excess of
high altitude	2000 ft. above sea level are subject
without proper	to jurisdiction of the local inspection
derating.	authorities. Check with the factory.
Water Dripping in Firebox
Possible Cause	What To Do
Tube in heat	A tube failure is almost always
exchanger has	caused by:
overheated and	(a) Scale formation in the tube, or:
ruptured.	(b) inadequate water flow through the
	boiler.
	Replace heat exchanger tube(s) and
	check for proper flow.