How to choose suitable vibration isolators for outside AC splits?

The characteristics:

  • Weight: very light – light
  • Disturbing frequency: medium – high
  • Mounting: standing

Find below our tables of Damping efficiency upon disturbing frequency

vibration isolators for outside AC splits

Walraven VibraTek® selection matrix:

How to evaluate the suitability of an isolator?

walraven vibratek how to redt the tables

How to read the tables?

Example: the load per one vibro-isolator is 280 kg, and the operating frequency of the device is 2300 rpm. See the 5 steps to read from the table (as shown in the attached diagram) to find out if the selected vibro-isolator meets the damping conditions and is well-matched.

The motor’s speed (rpm) causes vibrations (Hz) in HVAC devices. To simplify product selection, we’ve organized tables by speed, as it’s easily obtainable from suppliers

  1. Select the weight of the device in the table – greater than or equal to 280 kg
  2. Horizontally to the left, you can see the product number of Walraven VibraTek®
  3. Horizontally to the right, you can read the deflection
  4. Locate the column with a frequency lower than 2300 rpm
  5. Read the damping performance at: cross-deflection and frequency

Damping efficiency upon disturbing frequency

Damping performance description

 

V[%] Damping performance description
99% excellent high requirements medium requirements regular requirements
93% perfect
88% very good
81% good
67% sufficient
20% mediocre low improvement or negative impact – contact Walraven Technical Support for alternative solution
0% nochange
resonance better without insulation

Walraven VibraTek® MS-M

Walraven VibraTek® MS-M
Damping efficiency upon disturbing frequency
Article no.: load on vibroisolator deflection RPM 500 800 1000 1200 1500 2000 2500
[N] [~kg] [mm] Hz 8,3 13,3 16,7 20,0 25,0 33,3 41,7
2800200150 100 10 8,0 18,6% 78,7% 87,4% 91,6% 94,8% 97,1% 98,2%
150 15 12,0 57,3% 86,8% 91,9% 94,5% 96,6% 98,1% 98,8%
2800200250 200 20 9,6 40,3% 82,9% 89,7% 93,1% 95,7% 97,6% 98,5%
250 25 12,0 57,3% 86,8% 91,9% 94,5% 96,6% 98,1% 98,8%
2800200500 350 35 8,4 25,4% 80,0% 88,0% 92,0% 95,0% 97,3% 98,3%
500 50 12,0 57,3% 86,8% 91,9% 94,5% 96,6% 98,1% 98,8%
2800200750 550 55 8,8 31,1% 81,0% 88,6% 92,4% 95,3% 97,4% 98,3%
600 60 9,6 40,3% 82,9% 89,7% 93,1% 95,7% 97,6% 98,5%
750 75 12,0 57,3% 86,8% 91,9% 94,5% 96,6% 98,1% 98,8%
2800201000 850 85 10,2 45,7% 84,1% 90,4% 93,5% 95,9% 97,8% 98,6%
1000 100 12,0 57,3% 86,8% 91,9% 94,5% 96,6% 98,1% 98,8%

Walraven VibraTek® MS-1

Walraven VibraTek® MS-1
Damping efficiency upon disturbing frequency
Article no.: load on vibroisolator deflection RPM 500 800 1000 1200 1500 2000 2500
[N] [~kg] [mm] Hz 8,3 13,3 16,7 20,0 25,0 33,3 41,7
2800300050 25 2,5 11,5 54,6% 86,1% 91,5% 94,3% 96,4% 98,0% 98,7%
50 5 23,0 81,5% 93,5% 95,9% >97,2% 98,2% 99,0% 99,4%
2800300150 100 10 15,3 69,4% 89,9% 93,8% 95,8% 97,3% 98,5% 99,1%
150 15 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800300250 200 20 18,4 75,8% 91,7% 94,9% 96,5% 97,8% 98,8% 99,2%
250 25 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800300500 300 30 13,8 64,8% 88,7% 93,0% 95,3% 97,0% 98,3% 98,9%
400 40 18,4 75,8% 91,7% 94,9% 96,5% 97,8% 98,8% 99,2%
500 50 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800300750 600 60 18,4 75,8% 91,7% 94,9% 96,5% 97,8% 98,8% 99,2%
750 75 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800301000 800 80 18,4 75,8% 91,7% 94,9% 96,5% 97,8% 98,8% 99,2%
900 90 20,7 79,0% 92,7% 95,5% 96,9% 98,0% 98,9% 99,3%
1000 100 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%

Walraven VibraTek® SA-3 Silent Absorber

Walraven VibraTek® SA-3 Damping efficiency upon disturbing frequency
Article no.: load on vibroisolator deflection RPM 500 800 1000 1200 1500 2000 2500
[N] [~kg] [mm] Hz 8,3 13,3 16,7 20,0 25,0 33,3 41,7
2800800300 200 20 2,3 385,6% -50,7% 37,5% 63,5% 79,4% 89,4% 93,4%
250 25 2,9 633,0% 7,4% 55,5% 72,8% 84,2% 91,7% 94,8%
300 30 3,5 4077,4% 33,1% 65,5% 78,3% 87,1% 93,1% 95,7%
2800800450 350 35 3,1 849,3% 17,9% 59,5% 74,9% 85,3% 92,2% 95,2%
400 40 3,6 10443,2% 34,9% 66,2% 78,7% 87,4% 93,3% 95,8%
450 45 4,0 -776,2% 46,0% 71,1% 81,5% 88,9% 94,1% 96,3%

Walraven VibraTek® SB-MM Silentblock

Walraven VibraTek® SB-MM Damping efficiency upon disturbing frequency
Article no.: load on vibroisolator deflection RPM 500 800 1000 1200 1500 2000 2500
[N] [~kg] [mm] Hz 8,3 13,3 16,7 20,0 25,0 33,3 41,7
2801400180 150 15 1,7 286,6% -430,8% -16,7% 40,3% 68,5% 84,4% 90,6%
180 18 2,0 325,8% -134,7% 18,6% 54,7% 75,1% 87,4% 92,3%
2801400290 250 25 1,7 292,4% -336,0% -8,6% 43,4% 69,9% 85,0% 90,9%
290 29 2,0 325,8% -134,7% 18,6% 54,7% 75,1% 87,4% 92,3%
2801400420 350 35 2,1 338,2% -106,0% 24,3% 57,3% 76,3% 87,9% 92,6%
420 42 2,5 429,3% -27,8% 44,0% 66,8% 81,0% 90,1% 93,9%
2801400750 450 45 2,4 401,6% -40,6% 40,3% 64,9% 80,1% 89,7% 93,6%
550 55 2,9 646,5% 8,4% 55,9% 73,0% 84,3% 91,7% 94,9%
750 75 4,0 -776,2% 46,0% 71,1% 81,5% 88,9% 94,1% 96,3%
2801401170 1000 100 3,4 2193,9% 30,4% 64,4% 77,7% 86,8% 93,0% 95,6%
1170 117 4,0 -776,2% 46,0% 71,1% 81,5% 88,9% 94,1% 96,3%
2801401690 1200 120 2,8 578,7% 2,5% 53,8% 71,9% 83,7% 91,4% 94,7%
1500 150 3,6 9082,1% 34,7% 66,2% 78,7% 87,3% 93,3% 95,8%
1690 169 4,0 -776,2% 46,0% 71,1% 81,5% 88,9% 94,1% 96,3%

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