Install Instructions
Part number 550-100-321/0520
2
Instructions for Wiring the System Circulator
Figure 1
Removing front panel
Figure 2 Boiler front panel removed
Front panel removal
1. Turn off (unplug) power to the boiler.
2. Remove two (2) Phillips head screws on the bottom flange of
front panel, lift out and then up to remove the front panel.
Disconnect electricity to boiler. Failure to do so can cause severe injury, death, or substantial
property damage
ELECTRICAL SHOCK HAZARD - TURN OFF ALL POWER TO BOILER WHEN SERVIC-
ING. Failure to do so can cause severe injury, death, or substantial property damage.
Wait until heat exchanger/boiler is cooled down before proceeding. Failure to do so can cause
severe injury.
e boiler contains ceramic ber and berglass materials. Use care when handling these materials
per instructions in the Boiler Manual, available on-line. Failure to comply could result in severe
personal injury.
Figure 2 show the interior of a 155C boiler. Use gures as a reference, location of components may
be slightly dierent than shown.
Replacement instructions
LEGEND
1. Control module
2. Gas Valve
1