Roberts Gorden UltraVac URVBNC, Installation Manual

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SECTION 3: I
NSTALLATION
19 of 65
3.3 Cable Requirements:
As per individual building specification for class of
cable to be used. Use copper conductors only.
3.4 Check Installation Materials
3.4.1 Switchable Loads
The controller relays are rated for switching loads no
greater than 3 A. The total added current load for all
8 relays must not exceed 25 A.
3.4.2 Control Wiring
Shielded cable (four twisted pairs of stranded 24
AWG minimum wire) is required for use with
indoor sensors.
Shielded cable (one twisted pair of stranded 18
AWG minimum wire) is required for the outdoor
air sensor, VFD signal wiring and pressure
switch.
Shielded cable (one twisted pair of stranded 22
AWG minimum wire) is required for RS-485
communications between controllers.
3.4.3 Programming Details
Every controller is pre-programmed for one pump
and up to three heating zones. Use a site
layout drawing to identify the heating zones.
3.4.4 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 18 AWG mini-
mum or equivalent Belden #8451, #1503A; General
Cable #C2514.
• Communications between Multiple Controllers
(RS-485)
One twisted pairs of 22 AWG minimum or equiva-
lent shielded cable; Belden #3105A.
3.4.5 ULTRAVAC™ Unitary Controller
Below is the recommended cable for the various
connections for ULTRAVAC™ Unitary Controller:
• Line Power Supply
The power connection should be made with cable,
size 14 AWG.
• Three Relay Outputs
The control connection for load of each individual
relay should be made with cable, size 18 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
(RS-485)
One twisted pairs of 22 AWG minimum or equiva-
lent shielded cable; Belden #3105A.
3.4.6 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 pairs of 22 AWG minimum or equiva-
lent shielded cable; Belden #3105A.
3.4.7 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
VFD75230 or VFD75230N4 14 AWG
VFD75230-3 or VFD75230-3N414 AWG