HydroStat User Guide

INITIATING BOILER IGNITION continued

OPERATING CHECK

3. Pilot Ignition: Once the control receives confirmation from the vent damper or inducer fan, the control

will initiate the spark ignitor and turn on the pilot valve to light the pilot. The control will spark the pilot in-

termittently (approximately one second on followed by one second off) until it verifies that the pilot is lit.

Prior to each one-second spark, the display will show the number corresponding to the ignition attempt

(01, 02, 03, etc.).

Electrical Shock Hazard: The ignition circuit of the control can produce 10,000 volts

which can cause severe injury or death.

4. Pilot Flame Sense: When the pilot flame is sensed, the green FLAME light will turn on. If, after 30 ig-

nition attempts (75 seconds), the control does not sense pilot flame, the pilot valve will de-energize, the

spark trials will terminate and the green FLAME light will blink. After a five minute delay, the ignition se-

quence will retry to ignite the pilot (starting at step 3 above).*

5. Main Burner Ignition: When the pilot flame is sensed, the control energizes the main gas valve to fire

the boiler.

*NOTE: The five minute delay will be reset if the call for heat is removed for 45 seconds.

1. Check Flame Current: With the boiler in operation, press and release the TEST/SETTINGS button

four times in short intervals (see page 8 for more details). The display will show the flame current. A good

reading is 2.0 (or higher) micro amps. If the reading is not in this range, refer to PROPER PILOT FLAME

on page 9 for instructions on adjusting the pilot.

2. High Temperature Limit Check: The high limit shut-off functionality of the control must be tested fol-

lowing installation. On the first run cycle following the system being powered, the control will allow the

boiler to fire to the high limit setting. Thereafter, the Economy function (when active) will establish target

temperatures often below the high limit setting. To test the high limit shut-off function, recycle power to

the control prior to initiating the call for heat. NOTE: The Economy function can also be turned off prior to

testing the high limit shut-off. If this method is used, the Economy dial will need to be reset to the desired

setting following the test (see page 4 for more details).

Flame Shut Down Sequencing: When the boiler reaches the HI LIMIT setting or the call for heat goes

away, the main burner, pilot flame and FLAME light will all turn off.

• 4200a Control: The damper will begin to close and the V-PWR, V-SW, and LIMITS lights will turn off.

• 4200i Control: After 15 seconds, the inducer motor will turn off and the V-PWR, V-SW, and LIMITS

lights will turn off.

CIRCULATOR OPERATION

Circulator Hold Off Feature: To reduce the potential for condensing, on a call for heat the HydroStat-IC

will allow the boiler to heat to 125°F prior to energizing the heating circulator. Once energized, the circula-

tor will remain on for the duration of the heating call unless the boiler temperature drops below 115°F. If

this occurs, the circulator will re-energize when the boiler returns to 125°F. Circulator Hold Off will expire

after 15 minutes. This feature can be deactivated – see page 11 for more details.