EN2C-0035SZ20 R0604
2
INSTALLATION
IMPORTANT
1. Installer must be a trained experienced service
man.
2. Disconnect power supply to prevent electrical
shock and/or equipment damage.
3. When the MT4000 is used in stand alone
applications, use a proper strain--relief
4. The appliance manufacturer’s instructions should
be followed when provided.
5. Carry out a thorough checkout when installation is
completed.
Low fire adjustment switch
(optional)
0
Fig. 1. Installation drawing MT4000 Series
Mounting and orientation
There are no restrictions in the mounting angle of the motor.
The motor can be assembled by 4 screws. For mounting hole
dimensions, see installation drawing.
ADJUSTMENT AND CHECKOUT
WARNING
•
Adjustment should be made by qualified personnel only.
•
If the appliance manufacturer supplies checkout and/or
service and maintenance instructions, carefully follow
them.
•
All adjustments on the cams should be done
after
disconnecting the power supply.
Functions of cams:
MT4000 A/B series
MT4001 A/B/C, MT4002B
& MT4003C series
cam
cam
I
high fire position of
air damper motor
I
high fire position of
air damper motor
II
closed position of
the air damper motor
II
closed position of air
damper motor
III
auxiliary switches
III
low fire position of air
damper motor
IV
auxiliary switches
IV
low fire position of air
damper motor
V
switches the second
stage operation of
the gas valves
Adjustment for cams
Disconnect power supply and remove the cover. Use
adjustment tool inside the cover to adjust the cams. Place the
tool in one of the cam grooves to turn the cam in steps of
approximately 2 degrees.
Factory set “zero position”
All motors are factory set with zero position corresponding
with 45 degrees angle of flat surface on actuator shaft (see
figure 1.).
When field re--adjustment of zero position is necessary, rotate
cam II (clock or counter--clockwise) to zero position and
re--adjust arrow on scale manually.
Low fire adjustment switch (optional)
A push button switch, to activate electrically movement of the
cam assembly, independent from the flame relay signals, is
optional on MT4001B, MT4001C, MT4002B and MT4003C
type of servo motors.
Use the push button switch to move the cam assembly
forward during (re)adjustment of the low fire position of the
damper. When this push button is pressed down, the motor
will drive to high fire position. When the push button is
released, the motor will drive to low fire position.
Depending on type, it is positioned either on left or right side
of the front plate.
