Hydrolevel 3150 User Manual
Page 9
9
NO
YES
NO
Is the
Thermostat
(T-T) Calling
for Heat?
Is There
120 VAC
Between B1
and B2?
NO
Is the
External Zone
(ZC-ZR) Calling
for Heat?
NO
Is the
Low Limit Dial
Set to OFF?
YES
NO
YES
Is the
Red LED
On?
The Control is
Sensing
Low Water.
Is the
Yellow LED
On?
The Control is
Sensing High
Temperature.
If both the red and yellow LEDs are off and there is a call to
fire the burner, there will be 120 VAC on terminals B1 and B2.
̈ If 120 VAC is not present, the control should be replaced.
HydroStat is supplying 120 VAC to the burner circuit.
̈ Recheck wiring and operation of burner and other limit controls.
The Control
is Operating
Properly.
Replace
Control
The burner will not fire until the boiler water has dropped to the
high limit differential set-point. See HydroStat Settings chart.
̈ Check that the high temperature setting is correct.
Troubleshooting Flow Chart 1 – Burner Will Not Fire
YES
YES
NO
Is the
Green LED
(TEMP ACTIVE)
On?
The Control is
Not Powered.
The Temp Active LED will be on at all times when the control is
powered.
̈ Check for 120 VAC on terminals L1 and L2.
YES
NO
Does the
Display Read
?
The Control is
Purging Latent
Heat from the
Boiler.
The Thermal Pre-Purge feature holds off the burner until the control
determines if the latent heat in the boiler can satisfy the heat call.
NO
YES
When the low temperature
setting is set to OFF, the
HydroStat will act as a cold
start control. The burner
will not fire unless there is
a call from the thermostat
(T-T) or an external zone
(ZC-ZR).
̈ Set thermostat to call
for heat. Burner should
fire.
̈ If the boiler has a tank-
less coil, set the Low
Temperature Limit to
maintain temperature.
YES
CAUTION – ALWAYS ALLOW A BOILER TO COOL BEFORE ADDING WATER
The burner will not fire until the low water condition is satisfied.
̈ Check that the system is filled with water.
̈ Check that the sensor is inserted fully into the well and contact
between its spring clip and the copper well tube is made.
̈ Check that the control is tightly clamped to the well.
Also see page 8 for additional troubleshooting information.
HydroStat 3150 Instructions Page 9