High Limit Safety Switch; Pressure Relief Valve Installation; Condensate Drain And Piping - Riello Array AR 3000 Installation And Operation Manual

"33 LWCO/Air inlet block".
At this point press the Reset button. The error will turn off.
Module level:
a Low Water Cut Off (LWCO) sensor is installed on top of the supply
fitting of each heat exchanger. To check its functionality, go to the
HMI touchscreen, access the Module screen (see section 6.3.4),
push MODULE TEST, then LWCO TEST button and confirm. On the
screen will appear the error "LWCO2 error".
At this point press the Reset button. The error will turn off.

4.9 High Limit Safety Switch

A high limit safety switch is installed on each heat exchanger of
the boiler. To simulate a high limit lockout at 208°F go to the 905PB
inner display, access the Settings menu, select Test mode, then
click on Max temp.
The control will display "MN: Max. Thermostat Lock Error".
At this point press the reset button on the removable display to
restart the module.

4.10 Pressure Relief Valve Installation

ASME rated Pressure Relief Valves are factory installed in each
Array Boiler. The standard pressure rating for the relief valves is 75
PSI. The relief valves are installed on each heat exchanger of the
boiler as shown in Fig. 10. The relief valves' drain piping must be
connected to a nearby floor drain. In multiple unit installations
the discharge lines must not be manifolded together.
Each must be individually run to a suitable discharge location.
Relief valves should be manually operated at least once a year.
If a relief valve discharges periodically, this may be due to thermal
expansion in a closed water supply system.
Contact the water supplier or local plumbing inspector on how to
correct this situation.
Do not plug the relief valve.
75PSI Relief valve
(one for each module)
Fig. 10 Pressure Relief Valve Location

4.11 Condensate Drain and Piping

The Array Boiler is designed to condense water vapor from the
flue products. Each heat exchanger of the boiler is equipped
with a condensate trap (see Fig. 11), while a syphon collects the
condensate of the vertical flue manifold.
Condensate
Trap
Condensate
Trap
Condensate
Trap
Condensate
Trap
Fig. 11 Condensate Drain System
9
WARNING: At the Start-up and after prolonged shutdown of
the boiler, the condensate traps and the syphon must be filled
with water prior to restarting it, otherwise combustion gases
may enter the room with a risk of an excessive level of carbon
monoxide.
The procedure for filling the traps and syphon with water is shown
in the Fig. 12:
17
INSTALLATION
Fill the syphon with
water from the top
of the vertical flue
manifold BEFORE
connecting the vent
piping
Vertical Flue
Manifold
Syphon