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Part Number 550-110-677/0299
20
MV
MV/PV
PV
ALARM
ALARM
24 V
24 V (GND)
SENSE
SPARK
677-01-p
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Install strain relief bushings
wherever electrical wiring
passes through jacket.
Vent connections — Connect
with ¼" tubing and run vent
line outside building per code
requirements.
13
13a
Figure 10
Control assembly — steam, pumped return
Wiring — steam
pumped return
VI
When using a tankless heater,
knockout the opening in the
inner panel. Locate the controls
to allow room for the tankless
heater piping. The tankless
heater temperature control (not
shown) installs in the heater
tapping.