Startup
RT-SVX34F-EN
39
The RTAM module provides a 0 to 10 Vdc output to control
the Variable Frequency Drive. DIP switches located on the
RTAM configures the unit to use the output for a VFD.
Customer changeover input from Low Voltage Terminal
Board (LTB5) activates VAV heating. The Supply Air
Heating setpoint must be set to the desired discharge air
temperature for heating. This VAV heating mode is
available only with modulating gas heat units. In this mode
the gas heaters modulate and the supply air pressure
control remains active to satisfy the zone settings.
For constant volume (CV) units with modulating gas heat
using a conventional thermostat or for Single Zone VAV
units with modulating gas heat, the Discharge Air SP on
the RTOM must be set to desired discharge air
temperature in order for the unit to function properly. See
Figure 35, p. 38
For VAV units with modulating gas heat,
the Supply Air Heating Setpoint on the RTAM is used to
control the heat setpoint in the changeover heating mode.
The RTVM (Ventilation Module) provides a 2 to 10 Vdc
signal to control the Exhaust Blade Actuator in order to
relieve positive building pressure. The signal output will
be modulated based on the measured values from the
Space Pressure Transducer. The Space Pressure
Calibration Solenoid will ensure that the RTVM reads a
differential pressure between the building pressure and
atmospheric pressure. The Space Pressure Setpoint and
Space Pressure Deadband are set by adjusting
potentiometers located on the RTVM. Also, units
configured for Single Zone VAV control with Demand
Controlled ventilation will require an RTVM for the
additional, required Outside Air damper minimum
position setpoint potentiometers.
The RTDM (Dehumidification Module) provides a pulsed
signal output to control the Cooling and Reheat
Modulating Valves. The RTDM will also monitor the
Entering Evaporator Temperature as well as protect
against a low refrigerant pressure in the reheat circuit.
DIP Switches:
Switch 1 is “ON” for VFD's.
Switch 2 is “OFF” for VAV.
Switch 3 and 4 operation are explained under “supply air
temperature reset”.
Switch 5 is “OFF” for DWU Disabled and “ON” for DWU
Enabled.
Conventional Thermostat Connections
(Available Only with CV)
This feature allows conventional thermostats to be used in
conjunction with the RTRM on Constant Volume
Applications only. It utilizes the conventional wiring
scheme of R, Y1, Y2, W1, W2/X, and G. Refer to
Figure 21,
p. 31
for conventional thermostat connections. Applicable
thermostats to be used with the conventional thermostat
inputs are:
TCI - Trane Communication Interface
(Optional)
This module is used when the application calls for an ICS
building management type control system. It allows the
control and monitoring of the system through a Trane
Tracer™ panel. The module can be ordered from the
factory or ordered as a kit to be field installed. Follow the
installation instructions that ship with each kit when field
installation is necessary.
Figure 36.
RTVM module
Figure 37.
RTDM module
DA COOL/FAN SPD
SA REHEAT
DEHUMID
SPC PRESS DB
SPC PRESS
R136
J4
J9
J11
J12
J3
J1
J2
TP2
TP3
R42
R40
1-
1
1
1-
TP4
TP5
R130
R41
TB2
TB1
R46
-1
-1
J5
1-
1 = Space Pressure Deadband (iwc)
2 = Space Pressure Setpoint (iwc)
3** = R130 (SA REHEAT SP) = Design
Minimum Position at Minimum Fan
Speed Command
4** = R41 (DEHUMID) = DCV Minimum
Position at Minimum Fan Speed
Command
5** = R136 (DA COOL/FAN SPD) = Design
Minimum Position at 50% Fan Speed
Command
**Setpoints only required for Single Zone VAV units with Demand
Controlled Ventilation installed.
RTDM
Table 19.
Thermostats
Vendor
Part #
Trane Part #
Honeywell
T7300
Honeywell
T874D1082
BAYSTAT011
Enerstat
MS-1N
BAYSTAT003
