ROBERTS GORDON® ULTRAVAC™ CONTROLLER INSTALLATION MANUAL
3.3 Cable Requirements:
As per individual building specification for class of cable to be used. Use copper conductors only.
3.3.1 ULTRAVAC™ Controller
Below is the recommended cable for the various connections for ULTRAVAC™ Controller:
•Line Power Supply
The power connection should be made with cable, size 14 AWG.
•Eight Digital Output (Relays)
The control connection for load of each individual relay should be made with cable, size 16 AWG.
•Digital Input
The wiring connection for the pressure switch should be unshielded cable, size 18 AWG.
•Indoor Sensor Cable
a)Shielded cable - Four twisted pairs of stranded, 24 AWG minimum or equivalent Madison Cable #08CFJ00004; Belden #9681.
b)Unshielded cable - Four twisted pairs of stranded, 24 AWG minimum or equivalent AMP#219538, #219513; Belden#1585, #1583A.
•Outdoor Sensor Cable
Shielded cable - One twisted pair of 22 AWG mini- mum or equivalent Belden #8451, #1503A; General Cable #C2514.
•Communications between Multiple Controllers
One twisted pairs of 18 AWG minimum or equiva- lent shield cable; Belden #1902, General Cable #C1670A.
3.3.2 ULTRAVAC™ BMS Link Controller
Below is the recommended cable for the various connections for ULTRAVAC™ BMS Link Controller:
•Line Power Supply
The power connection should be made with cable, size 18 AWG.
•Communications between ULTRAVAC™ BMS Link and Multiple Controllers
One twisted pair of 22 AWG minimum or equivalent shield cable; Belden #1902, General Cable #C1670A.
3.3.3 Variable Frequency Drive (VFD)
Below is the recommended cable for the various connections for VFD:
•Line Power Supply
Input Wire Size Requirements
VFD P/N | Wire Size |
VFD75115 or VFD75115N4 | 12 AWG |
22 of 62
VFD75230 or VFD75230N4 | 14 AWG |
VFD20230 or VFD20230N4 | 12 AWG |
VFD75460 or VFD75460N4 | 14 AWG |
VFD20460 or VFD20460N4 | 14 AWG |
•
3.3.4 Repeater
Below is the recommended cable for the various connections for the repeater:
•Line Power Supply
The power connection should be made with cable, size 18 AWG.
•RS485 Communications
Multiple repeaters may be installed on the main loop and all communications cable should be made with shielded cable one twisted pair of
3.4Electrical Installation Requirements of ULTRAVAC™ Controller
DANGER
Electrical Shock Hazard
Disconnect electric before service.
Controller must be properly grounded to an electrical source.
Failure to follow these instructions can result in death or electrical shock.
•ULTRAVAC™ Controller must be feeding from a local fused isolator for a total amperage not exceeding 25 A.
•Eight digital outputs for each individual relay must not exceed 3 A.
NOTES:
•The total added current load for each individual relay must not exceed 3 A.
•The total added current load for all 8 relays must not exceed 25 A.
