13
MBT3N: Wiring/Operation
1. Connect the ON/OFF control switch as follows:
When the control switch is ON, the valve will open; when it is OFF, the valve will
close.
2. If connected to the yellow wire, a pilot lamp will light when the valve is open; if to
the brown, a pilot lamp will light when the valve is closed.
3. When checking the operation of the motor unit before installation, keep fingers well
clear of the bypass blowdown valve section.
Y yellow
BR brown
R
red
BK black
W
white
G
green
Y
BR
R
BK
W
G
Power AC
Electrical Ground
Control Switch
ON-open / OFF-closed
Lights when closed
Lights when open
PL
PL
4. Carry out an operational check of the motor under no-load conditions (no pressure)
before actual operation to ensure that the wiring is done properly.
You can check whether the valve is opened or closed by checking the orientation of
the flat surfaces on the shaft coupling at the base of the motor unit.
（
See p.15
）
When the flat surfaces of the shaft coupling are lined up with the piping, the valve is
open; when they are perpendicular, the valve is closed.
5. Make sure the control switch is OFF at start-up.
(The integrated ball valve is closed, causing the product to function as a trap.)
Open the inlet and outlet valves slowly and check to make sure that the product
functions properly as a steam trap.
If there is a problem, determine the cause by using the “Troubleshooting” section of
this manual.
6. Turn the control switch ON to use the bypass function.
(The integrated ball valve will be open.)
7. Turn the control switch OFF to stop using the bypass function.
(The integrated ball valve will be closed.)
8. The integrated ball valve should be closed when the product is used as a trap.
172-65162M-03 (BT3N/MBT3N/PBT3N) 5 Jul 2013
