AERCO Modulex High Pressure 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
5.9" [150 mm]
4"
[100 mm]
Figure 1-2.
Modulex
1.7 BOILER FREEZE PROTECTION
e to less than 44.6°F (7°C), the system pump will start.
NOTE
If glycol is used as antifreeze in the boile flow preventer must be installed in the
Main Components
Should the boiler water outlet temperature decreas
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.
r, a back
make-up/fill line.