Ventilation
Locate the vacuum system in an area with sufficient airflow and accessibility. To prevent excessive
ambient temperature rise it is imperative to provide adequate ventilation. Cooling is an important aspect of
reliable equipment operation and it is therefore important to install the unit in a reasonably cool area where
the temperature does not exceed 110°F (43°C). For higher ambient temperatures contact the factory.
For water-cooled vacuum systems it is necessary to check cooling water supply. A proper, consistent
water flow must be maintained for adequate cooling.
Electrical Preparation
All system wiring is performed at the factory if a control panel is supplied. Check area classification to
ensure all electrical enclosures comply to code. Required customer wiring is minimal, but should be done
by a qualified electrician in compliance with OSHA, National Electric Code and any other applicable local
electrical code concerning switches, fused disconnects, etc. DEKKER includes a wiring diagram in the
control panel for use by the installer. DEKKER recommends that a main disconnect switch be fitted
between the vacuum system and the incoming power.
Wire Size Chart (AWG) by Vmax Horsepower
Recommended Wire Size and Disconnect Size for Vmax Systems
Vmax
System
Serv
Full Load Amperage at
Volt.
Copper AWG (kcmil)
Recommended Conduit
Size in Inches
Recommended
Disconnect (Amps)
Recommended Class
J Fuse
Model No.
HP
Fact
200V 230V 460V
Tol.
200V 230V 460V 200V 230V 460V 200V 230V 460V 200V 230V 460V
VMX0023MA1
1.5 1.15
4.0
2.0 ±13%
VMX0023KA1
1.5 1.15
3.8
1.9 ±10%
15 15 9 5
VMX0036MA1
3 1
7.8 3.9
±13%
VMX0036KA1
3 1.15 7.2 3.6 ±10%
14
25 15 17.5 8
VMX0063MA1
5 1.15 14.4 7.2 ±13%
VMX0063KA1
5 1.4
13.8
12.0 6.0 ±10%
VMX0083MA1
5 1.15
14.4 7.2 ±13%
40 20
25 15
VMX0083KA1
5 1.4
13.8
12.0 6.0 ±10%
10
40 40 20 30 25 15
VMX0103MA1
7.5 1
18.8 9.4 ±13%
8
60
35 40
20
VMX0103KA1
7.5 1.3
22.0
19.0 9.5 ±10%
10
60 60 35 40 35 20
VMX0153MA1
10 1
24.8
12.4
±13%
8
60
35 45
25
VMX0153KA1
10 1.28 27.6 24.0 12.0 ±10%
10
1/2"
70 60 35 50 45 25
VMX0203KA1
15 1.3
45.0
39.0 19.5 ±10%
6
3/4"
100 100 60 80 70 35
VMX0303KA1
20 1.25 58.4 50.8 25.4 ±10%
125 110 60 100 90 45
VMX0303KA1-20
20XP 1.15
50.8
25.4 ±10%
4 1”
VMX0453KA1
25 1.3 74.6 62.0 31.0 ±10%
VMX0453KA1-20
25XP 1.15 83.0 72.2
36.1 ±10%
2 1-1/4”
150 150 70 125 110 60
VMX0553KA1
40 1.3 114.0 99.0 49.5 ±10%
00
4
1-1/4”
1” 200 200 100 200 175 90
VMX0553KA1-20
40XP 1.15 142.3 123.4 61.9 ±10%
VMX0753KA1
50 1.28
142.3
123.8 61.9 ±10%
4
1” 250 225 150 250 200 100
VMX1003KA1
60 1.15
169.7
146.8 73.4 ±10%
000 00
2
2” 1-1/4”
300 250 150 300 250 125
VMX1103KA1
75 1.15
200.0
174.0 87.0 ±10% 250 0000
2
350 300 150 350 300 150
VMX1203KA1
100 1.15 266.8 232.0 116.0 ±10%
400
350 0
2-1/2”
1-
1/2
”
450 400 200 450 400 200
NOTES: 1. Based on no more than three single insulated conductors rated 0-2000 volts.
2. Conduit sizes shown does include ground conductor if required (over 60 amperes).
3. Wire sizes are based on THHN 75 deg. C rated conductors.
4. Approved trade size conduit or metal tubing.
5. Motors with voltage tolerance of +/-13% have a voltage range of 200-260V, and 400-520V. Use the disconnect and fuse corresponding to the 230V or 460V range
6. Above information is general information. Please confirm actual motor full load amperage before proceeding.
After the electrical wiring connections are completed, check the incoming voltage to make sure that the incoming
voltage is the same as the vacuum system voltage. Line voltage should be within the voltage tolerance as
specified on the motor. Check the system for proper motor rotation. The direction of rotation is always clockwise
when looking at the shaft of the pump and is marked by an arrow on the motor or pump housing. Jog the motor
by pressing the START button, and then the STOP button. If the rotation is incorrect switch any two of the three
main power leads on the contactor inside the control panel. Failure to do so could result in serious equipment
damage.
WARNING: Install, ground, and maintain equipment in accordance with the National Electrical Code
and all applicable federal, state and local codes.
WARNING: For NFPA 99 hospital and generator applications: please shut down the vacuum pumps
prior to generator testing. The rapid stop and restart may cause damage to the pump and/or motor.
Dekker Vacuum Technologies, Inc. – Vmax/13
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