Roberts Gorden 10081601NA Rev H 12/11 - Manual (Page 27)

SECTION 3: I NSTALLATION
21 of 62
SECTION 3: INSTALLATION
Installation of the ROBERTS GORDON ®
ULTRAVAC™ Controller and the associated external
electrical wiring must be done by an electrician
qualified in the installation of control systems for
heating equipment.
3.1 Preparation
Before installing the controller, observe the following:
3.1.1 Ensure that you have a copy of the site layout
for the project that clearly identifies the separate
zones.
3.1.2 Familiarize yourself with the Controller and Vari-
able Frequency Drive component names and loca-
tions.
See Page 18, Figure 7 and Page 20, Figure 8.
3.2 Positioning the ROBERTS GORDON ®
ULTRAVAC™ Controller and Variable Frequency
Drive
3.2.1 Choose a mounting location for the controller.
For serviceability, it is convenient to mount the con-
troller and variable frequency drive at occupant level
in the vicinity of the pump. The variable frequency
drive should not be more than 50' (15 m) from the
pump.
Do not mount controller or VFD outdoors. VFD
must not be installed where subjected to adverse
conditions such as: combustible, oily, or hazard-
ous vapors or dust; excessive moisture or dirt;
vibration. To avoid damage from possible drips,
do not mount controller or VFD directly beneath
pump. Models with NEMA 4 rated enclosures will
withstand exposure to dust, dirt and water.
VFD should be mounted in locations where the
maximum ambient temperature does not exceed
104°F (40°C). Avoid installing the VFD in mezza-
nines, direct sunlight, or near external heat
sources because these locations usually have
unpredictable temperature rises.
Note that the maximum distance from the controller
to any sensor is 300' (120 m). For longer distances,
larger gauge wire may be needed (Consult your local
distributor). For multiple controllers, maximum length
of communication wire from the first controller to the
last is 4000' (1219 m) without the use of a repeater. A
repeater is available for wire length greater than
4000' (1219 m).
See Page 36, Section 5.5.1. Wiring
between the RS-485 converter to the controller
should not be more than 400' (122 m) in length.
See
Page 31, Section 5.2.
3.2.2 Position the controller and VFD at occupant
level for ease of service. To avoid electrical
interferences with communications bus, do not
mount VFD directly next to controller. Allow 2'
(.6 m) minimum between controller and VFD. If
the VFD is more than 100' (150 m) from the pump
a load reactor (P/N 90602460) must be used.
FIGURE 9: Controller Mounting
(Standard enclosure only, NEMA 4 enclosure mount-
ing varies)
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.
13" (33 cm)
16.25"
(41.3 cm)