AERCO Modulex General Manual - Manual (Page 15)

INSTALLATION, OPERATION & MAINTENANCE
1-7
FAN
GAS VALVE
BURNER
COVER
IGNITION
FLAME
DETECTOR
LOCAL NTC
SENSOR
H.L.
THERMOSTAT
BURNER
FILLING-UP
ELBOW
GAS PIPE
AIR INTAKE
CONNECTION
GLOBAL FLOW
NTC TEMPERATURE
SENSOR
HOT WATER
OUTLET (SUPPLY)
1/4" CONNECTION
WITH PLUG
GLOBAL RETURN
NTC TEMPERATURE
SENSOR
COLD WATER INLET
(RETURN)
WATER DRAIN
VALVE
CONDENSATE
DRAIN TRAP
1" [25 mm]
BOILER
FRAME
ALUMINUM/
SILICON HEAT
EXCHANGER
AUTOMATIC
AIR VENT
CONDENSATE
COLLECTION
TRAY MANIFOLD
4"
[100 mm]
5.9" [150 mm]
Figure 1-2.
Modulex Main Components
1.7 BOILER FREEZE PROTECTION
Should the boiler water outlet temperature decrease to less than 44.6°F (7°C), the system pump will start.
Should temperature decrease to less than 37.4°F (3°C), all heat modules will start at minimum output until
the return temperature reaches 50°F (10°C). Such a protection device is exclusively for the boiler. For the
protection of the whole system, a second freeze protection thermostat is necessary to switch on the
heating system pump.
NOTE
If glycol is used as antifreeze in the boiler, a back flow preventer must be installed in the
make-up/fill line.