57
SHUTDOWN
57
APPENDIX
APPENDIX
NOTE
In order to check if the control is functioning properly the following
readings can be taken:
AL Link
24VDC (with S1 Switch On and open circuit). Voltage is variable while
in normal operation depending on data stream.
Pressure Switches
(ie: Gas Pressure, Water Pressure, Flue Pressure, etc) 3.3VDC while
circuit is open.
Safety Switch
(High Limit) 24VDC while open
Flow Meter
5VDC at all times
In addition to the ones listed on the Troubleshooting table, there
are two error messages showing a combination of two potential
failures.
In order to detect which of the combined failures is stopping the
boiler, please go through the following procedures:
1. For Array AR 1500 and AR 2000: “Low water press./Bottom
module cond. block” error message on TS Boiler screen.
That message shows on touchscreen as a result of two possible
errors:
− Boiler water pressure lower than 7.5 psi, detected by the
pressure switch on the Return header;
− Condensate blockage that leads to a pressure higher
than 2.2” wc inside the condensate traps of the module
3 (for AR 1500) or module 4 (for AR 2000), detected by
the condensate pressure switch through the exible hose
connected to the condensate trap.
In order to discriminate between those two causes, it is suggested
to access the condensate pressure switch on such modules and go
through the following steps:
− The pressure switch is normally closed (NC). Conrm it is
wired correctly, with connections on 1 (NC) and 3 (COM), see
pictures below.
1 (NC)
2 (NO)
3 (COM)
Fig. 68
Wired pressure switch
− Disconnect both wires.
Fig. 69
Disconnect wires
− Set the multimeter device on Ohm (Ω).
Fig. 70
Set multimeter device
− Connect the multimeter probes to 1 and 3 on pressure
switch.
− Check the multimeter display. If the pressure switch
works and is closed (that means the inner pressure of
the condensate trap is lower than 2.2” wc), the display
shows “0” or any other symbol indicating there is electrical
continuity between connections 1 and 3.
1 (NC)
3 (COM)
00.00
Fig. 71
Connect the multimeter probes
To Next Page
Loading...
