Ingersoll-Rand ReliaTel, Manual, Page: 51 / 176

RT-SVD03L-EN 51
Figure 37. Precedent ™ ™ 7.5 to 10 tons multi-speed
configuration
Figure 38. Precedent ™ ™ 7.5 to10 tons standard
configuration
Adjusting Maximum Unit Airflow
Adjust the R-136 potentiometer on the RTOM (same as
with 17 Plus) to change the potentiometer voltage (J-11
output) and thus change maximum fan speed. BC
Plenum fan units will output a 0-10 vdc signal from the
RTOM J-11. The potentiometer voltage chart is located
on a sticker on the fan housing itself and in the unit
Installation, Operations, and Maintenance manual
(IOM).
Indoor Fan Control Description;
Voyager
™ ™ Multi Speed and SZVAV VFD
Controlled Evaporator Fan Motor - Unit
Identification
Voyager ™ units use a forward curved evaporator fan
with a VFD controlled motor for multi speed and
SZVAV options. Unit fan control type can be identified
by the 9th digit in the model number as described in
the following chart:
Fan type
Standard
Multi-
speed
SZVAV
No heat (TC*, WC*) 0 (zero)
A F
Low heat L B G
High heat
H C H
Mod heat V D K
N No otte e:: TCH241F4F0AB is a SZVAV unit without electric
heat.
Wiring and Configuration
Multi-speed units use two relays located in the control
box to switch speeds at the VFD.
Figure 39. Multi-speed
Single zone VAV units use one relay and a vdc signal
from the J-11 of the RTOM to modulate the fan speed.
Figure 40. Single zone VAV
S Siin ng glle e Z Zo on ne e V VA AV V,, M Mu ullttii--S Sp pe ee ed d a an nd d 1 17 7 P Pllu uss