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25SS-PRC005-EN
Controls 20-60 Tons
Standard Options
20 through 60-Ton Condensing Units
System Control Options
Select one of the four following control
options to meet your application
requirements.
• No System Control provides the
compressors wired to a terminal strip
inside the control panel. The temperature
controller must be field provided and
installed. The 20, 25 and 30-ton have two
capacity steps. The 40, 50 and 60-ton
sizes have four steps available.
• Constant Volume Control includes a
W973 controller with two cool, four heat
steps on the 20, 25 and 30-ton sizes. Four
cool, four heat steps are provided on the
40, 50 and 60-ton sizes. The heating
contacts are wired to terminals in the
condensing unit control panel for easy
interface with a field supplied electric
duct heater or gas duct furnace. An
optional return air sensor is available
with this controller which provides the
zone temperature input to the
thermostat, thus generating the loading
demand signal to the Honeywell W973
constant volume controller.
• Supply Air VAV Control provides a
Honeywell W7100A control system. This
option is for use with shut-off VAV or
other applications requiring control of
supply air temperature. The control
provides a voltage output for interface
with field supplied components to
provide simultaneous economizer
operation. The discharge air sensor
ships with the unit for field mounting.
The standard VAV unit is provided with
reliable coil frost protection in the form
of Trane’s proven and patented
FROSTAT™. FROSTAT is used in place
of hot gas bypass.
• EVP Control consists of an interface
panel in the main unit control box and a
remote mounted control box that is
customer installed. The remote mounted
box contains the Honeywell W7100G
controller. This water chiller controller
has built in fixed-off timers and chiller
freeze protection. No provision for
periodic pumpout or lead-lag is
provided. Multiple chiller control is not
provided. There are two capacity steps
on 20, 25 and 30-ton sizes. Four capacity
steps are provided on the 40, 50 and 60-
ton sizes.
Low Ambient Control Option
• Standard — Unit start-up and operation
down to approximately 40°F at
minimum compressor load.
• Low Ambient — Factory-installed head
pressure control damper assembly
permits operation down to 0°F by
maintaining proper head pressure. Ten
minute timer is standard for protection
against nuisance trips.
Miscellaneous Options
20 through 60-Ton Condensing Units
Select the miscellaneous options to meet
your project requirements.
• Non-Fused Unit Disconnect Switch– A
non-fused disconnect switch is mounted
in the control box and provides for
interruption of power for servicing the
unit. Lugs are suitable for copper wires
only. No overcurrent or short circuit
protection is provided for the unit by this
switch.
• Hot Gas Bypass Valve — Hot gas
bypass valves are stocked and shipped
with the unit for field installation. When
suction pressure falls below the valve
adjustable set point, the valve modulates
hot gas to the inlet of the evaporator.
(Note: FROSTAT is standard on VAV units
and is recommended in place of hot gas
bypass).