Troubleshooting Guide

VT-751D and VT-752D
Master Appliance Corp.
2420 18
th
St.
Racine, WI 53403-2381 USA
Tel: [phone]
Email: [e-mail]
www.masterappliance.com
58279E REV A
pg. 4 of 7
Figure 7
SHRINK TUBE MUST COVER
TERMINALS OF WHITE WIRE FROM
CORDSET, MOTOR AND ELEMENT
HOLDER,
SHRINK TUBE,
MOVE TO COVER
TERMINALS
Ⓣ
ELEMENT
HOLDER
BLACK WIRES MUST
CLEAR SCREW
BOSSES
To remove the element connector:
1. Disconnect the black lead wire of the element connector from
circuit board (Figure 5). Disconnect the white lead wire of the
element connector (with piggyback terminal) from both the white
wire of the motor and the white wire of the cordset (Figure 3).
To remove the cordset:
1. Remove the green ground screw located near the nozzle of the
housing (Figure 1). Remove the black cordset wire from the
piggyback terminal of the jumper, (Figure 6). Remove the white
cordset wire from the piggyback terminal on the white wire from
the element connector (Figure 3). Lift the cable guard out of the
handle and remove the cordset.
INSTALLATION INSTRUCTIONS
To install the new CIRCUIT BOARD:
1. Place the circuit board into the housing with the knurled stem
protruding through the hole at the bottom of the housing
(Figure 7).
2. Assemble the #6-32 pan head screws Ⓜ (2 screws) to retain the
circuit board, and tighten to 12 – 15 in-lbs torque (Figure 1).
3. Connect the terminal of the black wire from the new circuit board
to the switch Ⓝ (Figure 8).
4. Assemble the new shrink tube Ⓣ over the black wire from the
element connector (Figure 5 & 7).
5. Connect the black wire from the new circuit board to the black
wire from the element holder Ⓟ. The new shrink tube Ⓣ must
be positioned over the terminals (Figure 5).
To install the MOTOR:
1. Ensure the black motor wire is connected to the switch Ⓢ
(Figure 8).
2. Connect the white motor wire to the piggyback terminal of the
white element connector wire and white wire from cordset
(Figure 3).
3. Assemble motor into housing and with (2) #6-32 x .50 long
screws Ⓛ (Figure 1). Torque to 16 – 20 in-lbs.
4. Assemble (1) M3 x 0.5 Ⓚ (Figure 2) through back side of
housing and into motor frame at a torque of 2-5 in-lbs.
Excessive torque will warp the motor frame, resulting in reduced
air flow and damage to the motor.
5. Assemble blower wheel onto shaft of motor and tighten set
screw with 1/8 inch hex key. Top of blower wheel hub must be
flush with top of motor shaft. Must not rub against frame of
motor and must not rub against wiring (Figure 9).
To install the ELEMENT CONNECTOR:
1. Connect the black wire from the new element connector to the
black wire from the circuit board Ⓟ. The new shrink tube Ⓣ
must be positioned over the terminals (Figure 5).
2. Connect the white wire of the element connector to the white
wires from the motor and cordset (Figure 10). Position the
shrink tube over the terminal from the motor and from the
cordset after the terminals are connected.
WARNING: Failure to cover the terminals with
shrink tubing
Ⓣ
could result in electrical short
SWITCH
TERMINALS
CIRCUIT BOARD
BLACK WIRE
MOTOR
BLACK WIRE
Ⓢ
JUMPER
BLACK WIRE
BLACK
JUMPER
WIRE
Figure 8
Ⓝ
Figure 9
SHAFT FLUSH WITH
TOP OF FAN HUB
WARNING: Failure to cover the terminals with
shrink tubing
Ⓣ
could result in electrical short
WARNING: Failure to cover the terminals with
shrink tubing could result in electrical short
Figure 6
BLACK CORDSET
WIRE