Trane Intellipak 2 Service Manual

Unit Startup
RT-SVX24K-EN101
Set Drain Duration Timer
Enter service test mode from unit Human Interface.
Navigate to the compressor condenser fan submenu.
Under head pressure control, use manual control.
Close drain valve and energize water inlet solenoid valve
until water reaches nominal level. Once level is achieved,
de-energize fill solenoid. Open drain valve and time how
long it takes for the water level to drop one inch, make sure
to take into account the closing time of the valve.
Chemical Water...

Unit Startup
10 2RT-SVX24K-EN
2. The second setpoint will be the emergency point
– The second setpoint will open the normally closedK2
 relay which will interrupt the sump proving
circuit which will generate a manual lockout. This
second setpoint will be used to protect the unit from
extremely high conductivity that would indicate a
failure in the system.
3. Inside the enclosure for the controller, there will be a thermostat
 and strip heater that will protect LCD from
cracking at low ambient conditions....

Unit Startup
RT-SVX24K-EN10 3
protection circuit before closing “Stage 1. After the first
functional stage has started, the compressor module
monitors the saturated refrigerant temperature and closes
the condenser fan output contact, when the saturated
refrigerant temperature rises above the “lower limit”
setpoint.
Units with an Economizer
Upon entering an “occupied” mode of operation, the RTM
receives input from the remote panel to start the supply
fan. For constant volume applications, the RTM supply...

Unit Startup
10 4RT-SVX24K-EN
control devices as well as a split condenser coil with one
section in the indoor air stream and the other in the
outdoor coil compartment.
During active dehumidification the discharge air will be
controlled to the Supply Air Reheat Setpoint by
modulating the amount of reheat produced by the reheat
coil. The Supply Air Reheat Setpoint, Occupied and
Unoccupied Dehumidification Setpoints are adjustable via
the human interface, BAS/Network control, or GBAS.
Active...

Unit Startup
RT-SVX24K-EN10 5
non-adjustable limit of 35° F for 10 continuous minutes.
Once capacity is reduced, it will remain reduced until the
current cycle of dehumidification is terminated or a purge
cycle occurs.
If the Entering EvaporatorTemp remains below 35° F for an
additional 10 minutes both circuits will be de-activated and
remain off until the Entering EvaporatorTemp rises above
45°F. Even though all compressors have been de-activated
the unit will remain in dehumidification mode and re-...

Unit Startup
10 6RT-SVX24K-EN
Figure 66. Energy recovery wheel exhaust air setpoint temperatures
Figure 67. Energy recovery wheel operation
 Outside Air Intake Damper
(Mist Eliminator not shown)
 Exhaust Air,
 Leaving Energy Recovery Wheel, 
 Path to Exhaust Fan
 Building Return Air
 Outside Air Bypass Damper
 Unit Return
 Airflow
 Exhaust Air
 Bypass Damper
 Energy Recovery Wheel
 Conditioned Outside Air
 Return Air Damper
 Path to Filters & Coil
 ERW Unit Entering Air 
 (Mixed Return Air &
 Conditioned...

Unit Startup
RT-SVX24K-EN10 7
Gas Heating Sequence of Operation
Standard
Two Stage Gas Furnace
The control system for the rooftop units are wired to
ensure that the heating and cooling do not occur
simultaneously. Refer to the wiring diagram that shipped
with the unit while reviewing the following sequence of
operation.
Honeywell Ignition System
(850 & 1100 MBH Two Stage Natural Gas)
When a heating requirement exists, the Rooftop Module(RTM) starts the supply fan and sends a request for heat to
the Heat...

Unit Startup
10 8RT-SVX24K-EN
(1800 & 2500 MBH Two Stage Natural Gas)
When a heating requirement exists, the Rooftop Module
(RTM) starts the supply fan and sends a request for heat to
the Heat Module. The Heat Module closes contacts and
starts the combustion blower motor through the
combustion blower relay.
The supply airflow switch and the combustion air switch closes. Power is applied through the high limit cutout to
the Honeywell ignition control board. The ignition control
board begins the pre-purge...

Unit Startup
RT-SVX24K-EN10 9
sequence of operation. As you review the sequence of
operations, remember these points:
1. The high limit switch will trip if exposed to a
temperature greater than the trip point, and will reset
automatically once the temperature falls below the
reset point.
2. The linear high limit switch is encased in a capillarythat extends across the unit supply air opening. The
limit will trip if any 6” span of the capillary exceeds the
trip point. Refer to Table42, p. 135.
3. Electric...

Unit Startup
11 0RT-SVX24K-EN
Temperature Differential Setpoint minus 5°F but not the
Evaporator Temperature Differential Setpoint, an
information only, auto-reset, High Superheat diagnostic is
initiated. If the calculated superheat exceeds the
Evaporator Temperature Differential Setpoint, a manual
reset, low refrigerant charge diagnostic is initiated and all
compressors on the circuit are locked out.
Wet Heat Sequence of Operation
Electrical circuitry for units with steam or hot water heat is
limited to...