Greenheck TSU-218 User Manual
Direct Gas-Fired Make-Up Air
Model TSU
Heavy Duty, High Airflow Applications
• Manufacturing and Industrial Facilities
• Up to 64,000 cfm
October
2005
Products
®
Model TSU
Direct Gas-Fired Make-Up Air Unit
The Greenheck model TSU is a
100% efficient direct gas-fired
heating and ventilating unit.
Airflow options include 100%
make-up air for constant volume
or variable volume applications.
For space heating, a
recirculation option is available.
The TSU is specifically designed
for providing heating and make-up
air for manufacturing facilities and
warehouses. Airflow volumes up to
64,000 cfm and heating capacities
up to 6,050,000 Btu/hr are offered.
TSU shown with optional weatherhood,
filter section and horizontal fan discharge.
Direct Gas-Fired Heat
Durable Construction
Designed for maximum weather resistance, TSU
housings are constructed of heavy gauge G90
galvanized steel. Lifting lugs are standard.
Direct Gas-Fired System
• Direct gas burners with
stainless steel mixing
plates
• Maxitrol burner modulation
control
• Flame safeguard with
digital fault indicator
capability
• 25:1 turn down ratio
Control Center
The control center includes the following standard
components:
• Magnetic motor starter
with solid state overload
protection
• Control transformer with
fusing
• Integral door interlocking
disconnect switch
• Separately fused motor
• Distribution terminal strip
Premium grade control components are selected
for reliable operation. All electrical components
are UL Listed, recognized or classified and factory
prewired for single point power connection.
Vibration Isolators
The entire fan and motor
assembly is mounted on vibration
isolators to minimize noise
transmission into the building.
Reliable Fan Performance
Air performance ratings from
Greenheck’s accredited test
chamber ensure accurate
data.
Double width, double inlet
forward curved wheels
for high efficiency and
low sound levels are
constructed of heavy gauge
steel. Wheels are balanced
to ensure vibration free
operation.
Access Doors and Panels
Large access doors and panels are provided for easy
inspection and maintenance of motors, drives, fan
wheels, filters, and heater controls.
Factory Wired
and Tested
All units are tested
prior to shipment.
Units are checked
for vibration and
proper operation.
2 3
Variable Volume
®
Outside Air
Supply Air
Outside Air
Outside Air
Supply Air
Supply AirRecirculated
Air
The variable volume option is recommended when
a building’s exhaust volumes may vary. This option
enables the make-up air volume to track with the
exhaust volume, providing only the amount of makeup air that is required.
The variable volume TSU saves energy in two ways.
First, the fan power is reduced whenever makeup air requirements are less than the maximum.
Second, whenever lower air volumes are sufficient,
the TSU requires less gas to heat the outdoor air.
Airflow Control Strategies
Greenheck offers three methods of controlling the
make-up air volume. All three vary the fan speed for
maximum energy savings.
• Variable Frequency Drive controlled by building
pressure.
• Variable Frequency Drive controlled manually
with a remote potentiometer.
• 2 speed motor controlled manually with a remote
switch.
Recirculation
The Recirculation option is recommended when the
ventilation equipment provides the primary source of
heating for the space.
Application
Temperature Control
A Room Temperature Control package is included
with the Variable Volume systems. The space
temperature is controlled by a room mounted
thermostat. A factory supplied remote control panel
is required.
Burner By-Pass Damper
Both the Variable Volume and Recirculation option
include a patented burner by-pass damper, which
maintains the pressure drop across the burner as
air volumes change. This assures that complete and
proper combustion occurs. The by-pass damper is
self-adjusting, designed for minimal maintenance,
and requires no controls.
This option recirculates up to 80% of the supply air
and efficiently heats it to maintain the desired space
temperature. A minimum of 20% outdoor air is mixed
with the recirculated air to provide a continuous
source of fresh air.
Only outdoor air is used for combustion. This
eliminates the possibility of contaminants in the
recirculated air from crossing the burner.
Airflow Control Strategies
Greenheck offers four methods of controlling the
recirculated air to outdoor air ratio. The ratio is
determined by the outdoor air and recirculated
air damper positions. The methods for adjusting
damper positions are outlined below:
• Modulating actuator controlled by building
pressure.
• Modulating actuator controlled manually with a
remote potentiometer.
• Two position actuator controlled manually with
a remote switch.
• Manually operated damper quadrants set to a
fixed position.
In all cases, the fan provides a constant volume of
supply air.
Temperature Control
A Room Temperature Control package is included
with the Recirculation system. The space temperature
is controlled by a room mounted thermostat. A
factory supplied remote control panel is required.
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