124 RT-SVD03G-EN
ReliaTel Ventilation Override
Three Ventilation modes are available with ReliaTel through use of an Options Module (RTOM) and
economizer (ECA) with Power Exhaust. Following is a list of each mode and what happens during
each.
Connections to the unit to accomplish Ventilation Modes are shown below. All three inputs are
shown for illustration; only one is typically used.
Note: Although not associated with ventilation override, humidistat connections for
dehumidification are also provided on this terminal block.
Emergency shutdown from the LTBI 5&6 will override any ventilation override mode.
Ventilation override inputs override smoke detector inputs through the RTOM. (3-25 tons only).
Table 44.
Supply Fan forced:
IGV/
VFD*
Compressors
may run?
OK to heat
(gas/elect.)?
Economizer
position?
Power
Exhaust?
Exhaust
Damper
1.
VHR
Relay*
Pressurization ON 100% No No 100% Off 0% ON
Purge ON 100% No No 100% On 100% ON
Exhaust OFF 100% No No 0% On 100% ON
*Voyager 27.5 - 50 tons VAV
1. Exhaust Damper is controlled on units with Power Exhaust w/ Statitrac.
Figure 71. LTB Layout
HUMIDISTAT
PRESSURIZE
PURGE
EXHAUST
24 VAC
PRS
EXH
CO
2
+CO
2
-
7
9
11
13
HUM
24 COM
PUR
8
10
12
14
HUMIDISTAT
LTB 4
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