ROBERTS GORDON® ULTRAVAC™ CONTROLLER INSTALLATION MANUAL
Step 7.1.3 After setting end vent vacuums between 2.5" wc and 3.0" wc, while all the burners are still operating, use the down arrow button on the VFD to reduce the frequency of the output signal to the pump. Reduce the frequency of the VFD until the manometer at each of the end vents reads 1.0" wc - 1.2" wc Make note of this frequency setting below. The frequency is found on the VFD’s LCD screen.
1.0" w.c. - 1.2" wc VFD Frequency Setting
Record Frequency Setting Here:
Step 7.1.4 Return to the PC and click the pump and zones to "OFF".
Step 7.1.5 Using the procedure described in on Page 27, Section 6.1.1 through Section 6.1.5, alter the fol- lowing parameters on the VFD:
Parameter | Parameter | Factory | New |
Number | Name | Default | Setting |
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P05 | Standard | 01 | 03 |
| Speed |
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| Source |
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P45 | Speed at | 0.0Hz | Frequency |
| Minimum |
| Setting noted in |
| Signal |
| Section 7.1.3 |
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P46 | Speed at | 60.0Hz | Frequency |
| Maximum |
| Setting noted in |
| Signal |
| Section 7.1.2 |
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Step 7.1.6 Return to the PC and click the vacuum pump and three zones to "AUTO", then click exit.
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