Modine Manufacturing VFV Manual

14-500.5
5H1034420001
INSTALLATION AND SERVICE MANUAL
Floor and Ceiling Mounted Unit Ventilator
Models VFV, VFF, VCV, and VCF
Models ZFV, ZFF, ZCV, and ZCF
September, 2022
THIS MANUAL IS THE PROPERTY OF THE OWNER.
PLEASE BE SURE TO LEAVE IT WITH THE OWNER WHEN YOU LEAVE THE JOB.
WARNING
1. Improper installation, adjustment, alteration,
service or maintenance can cause property
damage, injury or death, and could cause
exposure to substances which have been
determined by various state agencies to cause
cancer, birth defects or other reproductive
harm. Read the installation, operating and
maintenance instructions thoroughly before
installing or servicing this equipment.
2. This unit contains R-410A high pressure
refrigerant. Hazards exist that could result
in personal injury or death. Installation,
maintenance, and service must only be
performed by an HVAC technician qualied
in R-410A refrigerant and using proper tools
and equipment. Due to much higher pressure
of R-410A refrigerant, DO NOT USE service
equipment or tools designed for refrigerants
other than R410A.
IMPORTANT
1. The use of this manual is specically intended
for a qualied installation and service agency.
A qualied installation and service agency must
perform all installation and service of these
appliances.
2. Units with DX evaporator coils (Model Digit
10=5) contain the refrigerant R-410A. Review
the R-410A Material Safety Data Sheet (MSDS)
for hazards and rst aid measures.
3. Refrigerant charging should only be carried out
by an EPA-certied air conditioning contractor.
INSPECTION ON ARRIVAL
1. Inspect unit upon arrival. In case of damage, report it
immediately to transportation company and your local
factory sales representative.
2. Check rating plate on unit to verify that power supply meets
available electric power at the point of installation.
3. Inspect unit received for conformance with description of
product ordered (including specications where applicable).

214-500.5
SPECIAL PRECAUTIONS
SPECIAL PRECAUTIONS
THE INSTALLATION AND MAINTENANCE INSTRUCTIONS
IN THIS MANUAL MUST BE FOLLOWED TO PROVIDE
SAFE, EFFICIENT, AND TROUBLE-FREE OPERATION. IN
ADDITION, PARTICULAR CARE MUST BE EXERCISED
REGARDING THE SPECIAL PRECAUTIONS LISTED BELOW.
FAILURE TO PROPERLY ADDRESS THESE CRITICAL
AREAS COULD RESULT IN PROPERTY DAMAGE OR LOSS,
PERSONAL INJURY, OR DEATH. THESE INSTRUCTIONS
ARE SUBJECT TO ANY MORE RESTRICTIVE LOCAL OR
NATIONAL CODES.
HAZARD INTENSITY LEVELS
1. DANGER: Indicates an imminently hazardous situation
which, if not avoided, WILL result in death or serious injury.
2. WARNING: Indicates a potentially hazardous situation
which, if not avoided, COULD result in death or serious
injury.
3. CAUTION: Indicates a potentially hazardous situation
which, if not avoided, MAY result in minor or moderate
injury.
4. IMPORTANT: Indicates a situation which, if not avoided,
MAY result in a potential safety concern.
DANGER
Appliances must not be installed where they may be exposed
to potentially explosive or ammable atmosphere.
WARNING
1. Disconnect power supply before making wiring connections
to prevent electrical shock and equipment damage.
2. All appliances must be wired strictly in accordance with
the wiring diagram furnished with the appliance. Any wiring
di󰀨erent from the wiring diagram could result in a hazard to
persons and property.
3. Any original factory wiring that requires replacement must
be replaced with wiring material having a temperature
rating of at least 105°C.
4. Ensure that the supply voltage to the appliance, as
indicated on the serial plate, is not 5% greater than rated
voltage.
5. When servicing or repairing this equipment, use only
factory-approved service replacement parts. Refer to
the rating plate on the appliance for complete appliance
model number, serial number, and company address. Any
substitution of parts or controls not approved by the factory
will be at the owner’s risk.
CAUTION
1. Ensure that the supply voltage to the appliance, as
indicated on the serial plate, is not 5% less than the rated
voltage.
2. Units not approved for use in potable water systems.
3. Hot water supplied to the hot water heating option must not
exceed 200°F temperature or 125 PSIG pressure.
CAUTION
4. Do not operate the units within steam pressure greater
than 10 PSIG. Steam pressure must be 10 PSIG or lower
to avoid excessive discharge air temperatures that could
cause burns or personal injury.
5. Do not overcharge the refrigeration system. This can lead
to elevated compressor discharge pressure and possibly
ooding the compressor with liquid.
6. When servicing the unit, some components may be hot
enough to cause pain or injury. Allow time for cooling of hot
components before servicing.
7. Do not attempt to reuse any mechanical or electrical
component which has been wet. Such component must be
replaced.
IMPORTANT
1. Start-up and adjustment procedures should be performed
by a qualied service agency.
2. No water-ow can cause a freeze condition resulting in
damage to the coil.
3. Never leave the unit lled with water in a building without
heat unless antifreeze has been added.
4. All refrigeration checks must be made by a qualied
R-410A refrigeration technician.
5. Do not release refrigerant to the atmosphere. When adding
or removing refrigerant, all national, state/province, and
local laws must be followed.
6. To check most of the Possible Remedies in the
troubleshooting guide listed in Table 29.1 and Table 30.1,
refer to the applicable sections of the manual.
TABLE OF CONTENTS
Special Precautions .............................................................2
Unit Location ........................................................................3
Installation ............................................................................4
Start-Up Procedure ..............................................................7
Start-Up Sheet - Example ..................................................10
Dimensional Data ...............................................................12
Cooling Piping Locations - Floor Units Only ................ 16-17
Heating Piping Locations - Floor Units Only ................ 18-19
Cooling Piping Locations - Floor Units Only ................ 20-21
Heating Piping Locations - Floor Units Only ................ 22-23
Technical Data ...................................................................24
Component Layout - Floor Mounted Units .........................25
Component Layout - Ceiling Mounted Units ......................26
Maintenance ................................................................ 27-28
Troubleshooting ........................................................... 29-30
Replacement Parts ............................................................30
Model Nomenclature ..........................................................31
Commercial Warranty ........................................................32

3
14-500.5
UNIT LOCATION
Table 3.1 - SI (Metric) Conversion Factors
To
Convert
Multiply By To
Obtain
To
Convert
Multiply
By
To
Obtain
"W.C. 0.24 kPa CFH 1.699 m³/min
psig 6.893 kPa Btu/ft³ 0.0374 mJ/m³
°F (°F-32) x 0.555 °C pound 0.453 kg
inches 25.4 mm Btu/hr 0.000293 kW/hr
feet 0.305 meters gallons 3.785 liters
CFM 0.028 m³/min psig 27.7 "W.C
SPECIAL DESIGN REQUESTS
Units are sometimes built units with special features as
requested by the customer. This manual only covers standard
features and does not include any changes made for special
feature requests by the customer. Units built with special
features are noted with a 5-digit SPO (Special Product Order)
Number on the Serial Plate.
UNIT LOCATION
DANGER
Appliances must not be installed where they may be exposed
to potentially explosive or ammable atmosphere.
HANDLING
Each unit will be shipped to the site secured to a wood skid
using metal brackets. Whenever possible, all lifting and handling
of the unit should be done with the packing and skid in position.
Due to the length of the unit, 72" forklift tines are recommended
to avoid damaging the unit.
Remove the metal brackets prior to lifting the unit o󰀨 of the skid.
When slinging or using a forklift to lift the unit, the support points
should be su󰀩ciently apart to give stability when lifting. Unless
otherwise noted the lifting points should be equidistant from the
centerline. Extreme care should be taken not to drop the unit.
Considerable damage can occur to the unit during positioning,
in particular, to the paneling and exterior paint. Use an adequate
number of personnel and the correct tools when moving the unit.
A lifting device such as a forklift is needed to install this product.
A special key is provided with the unit for use with the tamper-
proof cabinet locks on the top and front panels. The use of
torque screwdrivers on panel, cover or component mounting
screws is not recommended. Hand-start all screws. If electric
drills are used – set at the lowest possible torque.
PREPARATION
1. Select the unit location. Ensure the wall or ceiling structure
is adequate for the required mounting provisions as
outlined in the "INSTALLATION" section. For Ceiling
Mounted units (Model Digit 2=C), check that ceiling is
capable of supporting the weight of the unit.
2. Before installation, ensure that the correct electrical power
supplies are available for the unit.
3. Each unit requires an independently fused and isolated
power supply.
4. If the installation has multiple units, check that unit model
and tagging corresponds with the installation plans.
Please contact your Airedale representative immediately if
discrepancies are noted.
5. Check to make sure that the units will have adequate
installation clearance around them.
6. Note that units with cooling coils will have a condensate
connection at the rear and suitable provisions should be
made for draining. If multiple units tee into a common drain
manifold, it must be sized to ensure free draining with all
the units in operation.
7. For units with outside air, inspect the wall sleeve installation
for gaps that would allow leakage of outdoor air into the
space. All joints and abutments should be sealed with
waterproof sealant.
Drainage
Units with cooling coils have a condensate drain pan connection
and 3/4" ID condensate line. The condensate drain pan
connection is eld changeable and can be mounted on either
the left or right side of the unit. To change the connection
location, remove the condensate line from the elbow. Remove
the elbow from the drain pan and remove the plug from the
opposite side of the drain pan. Re-install the elbow and the
plug on the opposite sides of the drain pan. Re-connect the
condensate line.
INSTALLATION - FLOOR MOUNTED
(MODEL DIGIT 2=F) UNITS
Note:(Ceiling Mounted Units proceed to the next section.)
The instructions detailed below are for the Installation of a
“Standard” unit. Accommodations and adjustments will be
required for the usage of additional unit accessories. Should
assistance be required for the installation of these additional
items, contact the factory at the phone number listed on the
back cover of this manual.
1. Check the walls and oor for straightness and check to
ensure that the wall is at a right angle to the oor. Should
there be any irregularity, the placement of foam tape on the
outside edges of the unit will ll the gaps between the unit
and the wall, allowing for the use of a sealant, to create a
smooth transition from the unit to the wall.
2. Remove the backing strip from the gasket on the wall
sleeve. Place the unit in the correct location, ensuring a
tight seal with the wall sleeve and the wall.
3. Place the unit in position and use the leveling legs to
ensure that the unit is level in both directions and also
plumb. Remove the front kick panel to access the leveling
legs (see Figure 4.1). Make sure that the foam gasket on
the back of the unit forms a tight seal between the unit and
the wall.
4. After adjusting for any irregularity in the location site, the
cabinet must be secured to the back wall. The back of
the cabinet has four holes, two on each side. The type
of materials used for the walls will determine the type of
fastener to use. Use 3/8" diameter fasteners with 1-1/2"
diameter washers. Securing the cabinet to the wall helps
to reduce movement and noise due to vibration. Drill the
appropriate sized holes for the fasteners that are to be
utilized, and insert the anchors that are to be used.
5. Make the condensate drain connection and the electrical
connections to the unit. For standard units the condensate
connection will be located in the left end compartment
when left hand cooling is selected, and in the right end
compartment when right hand cooling is selected. For units
with a cooling piping package, condensate drain connection
will always be located in the right end compartment.

414-500.5
INSTALLATION
Figure 4.1 - Leveling Leg Location
INSTALLATION - CEILING MOUNTED
(MODEL DIGIT 2=C) UNITS
The instructions detailed below are for the Installation of a
“Standard” unit. Accommodations and adjustments will be
required for the usage of additional unit accessories. Should
assistance be required for the installation of these additional
items, contact the factory at the phone number listed on the
back cover of this manual.
1. It is recommended that the rear of unit be positioned at
least 2" away from a wall or structure to ensure bottom
access panel containing lter and electrical box can fully
open.
2. Remove both end panels to allow for access to the
mounting holes. If installation does not allow for access
through the end of the unit, remove bottom panels prior to
placing unit on lifting device.
3. Place protective material on the supports of the lifting
device to prevent scratching or denting of the unit. Place
unit on the lifting device supporting the unit across its entire
length.
4. Raise the unit to the mounting position. Use eld supplied
rods and fasteners with 1-1/2" diameter washers to
suspend the unit at the mounting holes located at the top
of the unit (see Figure 4.2). The unit must be suspended at
each of the (4) 1 inch mounting holes. Do not suspend from
any other locations.
5. Install unit level and plumb to prevent excessive vibration
and premature failure. To ensure proper drainage unit
must be level. Do not mount unit on a slope. Tighten all
fasteners.
6. Make the condensate drain connection to the unit.
Figure 4.2 - Mounting Hole Locations
7.55
17.13
6.88
A
REMOVE END PANELS
FOR ACCESS TO
MOUNTING HOLES
01.00
MOUNTING HOLES
(TYPICAL 4)
PIPING ACCESS
PANELS
Table 4.1 - Mounting Hole Location Dimension A
Model Size Dimension A (inches)
750 48.25
1000 60.25
1250 72.25
1500 84.25
Piping Installation - Chilled/Hot Water Coils
CAUTION
1. Units not approved for use in potable water systems.
2. Hot water supplied to the hot water heating option must not
exceed 200°F temperature or 125 PSIG pressure.
3. Do not attempt to reuse any mechanical or electrical
component which has been wet. Such component must be
replaced.
Units without Piping Package (Digits 21-22=NN)
1. Chilled water and hot water coils are supplied, from the
factory, with unions. Field installed piping can be mounted
to the supplied unions with 3/4" female sweat connections.
2. Install shut-o󰀨 valves in lines to and from each coil to allow
maintenance or replacement of unit without shutting down
and draining entire system (see Figure 5.1 and Figure 5.2).
3. Include a circuit setter in the return line for water ow
regulation.
4. A drain valve (hose bib) should also be provided for each
coil to allow removal of water from the coil if located in an
area subject to freezing.
5. It is advisable to use a pipe line strainer before each coil.
6. Provide adequate pipe hangers, supports, or anchors to
secure the piping system independently of the coil.
7. See Figure 16.1, Figure 16.2, Figure 18.1 & Figure 18.2 for
supply and return connections .

5
14-500.5
INSTALLATION
Units with Piping Package (Digit 21=D or H and 22=D or H)
1. Chilled water and hot water piping packages are supplied
factory assembled and installed to the coil. All piping
packages include the following: control valve, shut-o󰀨
valves, strainer, circuit setter, PT ports, and balancing valve
(when 3-way control valve is selected).
2. Piping package terminations are threaded drop ear
connections, and are 3/4" for chilled water and 1/2" for hot
water. Drop ear connections are attached to xed plates,
and along with the coil provide support for the piping
package.
3. Piping package termination locations are set such that eld
piping can be routed through the bottom knock out, back
knock out, or out the side of the unit.
4. See Figure 20.1, Figure 20.2, Figure 22.1 & Figure 22.2 for
supply and return connections.
Figure 5.1 - Typical 2-Way Piping Installation
Figure 5.2 - Typical 3-Way Piping Installation
Piping Installation – Direct Expansion (DX)
Coils
CAUTION
1. Units with DX evaporator coils contain the refrigerant
R-410A. Review the R-410A Material Safety Data Sheet
(MSDS) for hazards and rst aid measures.
2. Refrigerant charging should only be carried out by an EPA-
certied air conditioning contractor.
Note:R-410A refrigerant is the only approved refrigerant for
this system. The unit should be piped up in accordance
with good refrigeration and/or plumbing practices.
See Figure 17.1 through Figure 17.2, for suction and liquid
line connections. For units with a heating pipe package, see,
Figure 21.1 through Figure 21.4, for suction and liquid line
connections.
The outdoor condensing unit must be connected to the indoor
unit coil using eld supplied refrigerant grade (ACR) copper
tubing that is internally clean and dry. Units should be installed
only with the tubing sizes for the approved system combination
as specied in Table 24.1.
Condensing unit is typically factory charged for a 15-foot lineset.
For additional lineset lengths please refer to manufacturer’s
charging chart.
See the installation and maintenance manual provided with the
condensing unit for installation, evacuation and system charge
information.
Piping Installation - Steam Coils
CAUTION
Do not operate the units within steam pressure greater than
10 psig. Steam pressure must be 10 psig or lower to avoid
excessive discharge air temperatures that could cause burns
or personal injury.
1. Steam coils are supplied from the factory with 1" NPT
connections
2. A steam trap should be provided with a trap of su󰀩cient
size and capacity to pass a minimum of two times the
normal condensate released by the unit at the minimum
di󰀨erential pressure in the system.
3. See Figure 19.1 and Figure 19.2 for supply and return
connections. For units with a heating pipe package,
see Figure 23.1 and Figure 23.2 for supply and return
connections.
Piping Insulation
Standard Units
Chilled water and condensate pipes should be insulated right
up to the coil to prevent condensation which can damage
objects located below the piping. Chilled water valves must also
be insulated to prevent sweating. Hot water pipes should be
insulated to reduce heat loss and to prevent overheating of the
end compartment.
Units with Piping Package (not available on Ceiling
Mounted units)
Chilled water piping package will not be insulated except
when piping is routed through pipe tunnel. Chilled water
piping package shall be positioned over drain pans to catch
condensate that forms on piping.

614-500.5
TERMINAL STRIP CONNECTIONS
The terminal strip connections are designed to clamp down on
the wires. To properly connect the wires to the terminal strip:
1. Push a small at-head screwdriver into the square hole on
the terminal. Press rmly until the screwdriver hits the back
stop and opens the terminal (see Figure 6.1).
2. Remove approximately 3/8" of insulation from the end of
the wire and push the stripped wire into the oval hole in the
terminal.
3. Remove the screwdriver. Pull on the wire to make sure that
it is securely clamped in the terminal.
4. Make sure that the terminal clamp is in contact with bare
wire (insulation removed).
Figure 6.1 - Terminal Strip
INSTALLATION
WIRING
WARNING
1. Disconnect power supply before making wiring connections
to prevent electrical shock and equipment damage.
2. All appliances must be wired strictly in accordance with
the wiring diagram furnished with the appliance. Any wiring
di󰀨erent from the wiring diagram could result in a hazard to
persons and property.
3. Any original factory wiring that requires replacement must
be replaced with wiring material having a temperature
rating of at least 105°C.
4. Ensure that the supply voltage to the appliance, as
indicated on the serial plate, is not 5% greater than rated
voltage.
CAUTION
1. Ensure that the supply voltage to the appliance, as
indicated on the serial plate, is not 5% less than the rated
voltage.
2. Do not attempt to reuse any mechanical or electrical
component which has been wet. Such component must be
replaced.
1. Installation of wiring must conform with local building
codes, or in the absence of local codes, with the National
Electric Code ANSI/NFPA 70 - Latest Edition. Unit must
be electrically grounded in conformance to this code.
In Canada, wiring must comply with CSA C22.1, Part 1,
Electrical Code.
2. A wiring diagram is provided with each unit. Refer to this
diagram for all wiring connections.
3. When installing any wiring into the control box, extra cable
must be left outside the panel to allow the panel to open
fully. Failure to follow these instructions may cause damage
to the wiring and/or the unit.
4. Control wiring may consist of both 24V analog control
wiring and low current digital control signal wiring. To avoid
signal interference, the two types should be run in separate
conduits. If run in the same conduit, the digital signal wiring
should be shielded at one end of the wiring run. Wiring
should be twisted, stranded, and shielded communication
wire.
5. The wire gauge must be sized according to the National
Electric Code or CSA code based on amp draw and length
of run. Use only copper wire.
6. A knockout with strain relief is provided on the electrical box
for power wiring. Each unit is supplied with terminal strip for
power connection.

7
14-500.5
START-UP PROCEDURE
START-UP PROCEDURE
IMPORTANT
1. Start-up and adjustment procedures should be performed
by a qualied service agency.
2. No water-ow can cause a freeze condition resulting in
damage to the coil.
3. Never leave the unit lled with water in a building without
heat unless antifreeze has been added.
Note:See start-up sheet examples - Figure 10.1 and
Figure 11.1.
Pre-start Checks
1. Check that the supply voltage matches the unit supply
voltage listed on the Unit Serial Plate. Verify that all
wiring is secure and properly protected. Trace circuits to
insure that the unit has been wired according to the wiring
diagram.
2. Check that the unit has no visible damage and that all the
components are secure.
3. Check that all eld electrical and mechanical work has
been performed according to all applicable Federal, State,
and Local codes.
4. Check the supply voltage to the unit is within +/- 5% of the
voltage on the unit serial plate.
5. Check that the system has been correctly ushed.
6. Check for any water leaks.
7. The unit and interconnecting piping have been evacuated
correctly and the condensing unit service valves are open
(DX Cooling units only).
8. Check that the plug is installed for the condensate
connection that is not being used.
9. Check that the motor is secure and the shaft and blower set
screws are tight. Rotate the blower shaft by hand.
10. Check that the lters have been properly installed.
UNIT START-UP PROCEDURE
Note:For models with DX Cooling, see the installation and
maintenance manual provided with the condensing unit
for start-up information.
1. (DX Cooling models only) Ensure that the condensing unit
start-up procedure has been carried out, as detailed in the
condensing unit installation and maintenance manual.
2. (DX Cooling models only) The compressor should be
isolated by removing the connection at the Y1 terminal
on the indoor unit. Main power can now be applied to the
indoor and outdoor units. A system electrical check can
now be carried out.
3. Switch the 3-speed switch to position 1, 2 or 3.
4. Switch the disconnect switch to the “ON” position.
5. Conrm that the blower motor is rotating in the correct
direction and blowing air out of the supply air grill.
6. (Units with Chilled Water, Hot Water and Steam coils only)
Ensure all valves are open to the unit.
7. (Units with Chilled Water and Hot Water only) Check water
ow rates and pressure drops and compare to design.
8. Check that the dampers are not obstructed and move
through their full range of motion.
9. During the unit operation, measure and record all the
information that is required to complete the Start-Up Sheets
that are supplied with the unit. Copy the information onto
the Start-Up Sheets (Figure 10.1 and Figure 11.1.) in this
manual for your records.
10. (DX Cooling models only) Shut unit down and disconnect
the main power. The compressor signal Y1 (disconnected
from the indoor unit in step 2) can now be re-connected
and main power applied to the system.
Note:(DX Cooling models only) The 24V power for the
indoor unit control circuit is supplied from a unit factory-
installed transformer. When the indoor and outdoor
units are supplied from separate main supplies, care
must be taken to ensure that the outdoor unit is isolated
whenever the indoor unit power is removed. Failure to
do so may result in freeze ups and other damage to the
unit.

814-500.5
SEQUENCE OF OPERATION
TYPICAL SEQUENCE OF OPERATION
The supply fan shall run at all times when unit is in occupied
mode. When in unoccupied mode, the supply fan shall run only
on a call for heating or cooling. The supply fan speed can be
adjusted using the standard equipped manual 3-speed switch.
If equipped with Modine Control System, the supply fan is
programmed to run for 2 minutes (adjustable) after the heating
or cooling cycle ends.
Freeze Stat (Optional)
On units equipped, an adjustable auto-resetting freeze stat is
factory set to trip at 35˚F. If the coil temperature reaches the
limit and the freeze stat trips, it shall automatically reset when
the coil temperature rises 5˚F above the setpoint. The freeze
stat shall be wired so that upon tripping, power is removed from
the supply fan, the outside air damper closes, and either the
HW valve opens (model digit 3=V) or the face & bypass damper
goes to full bypass (model digit 3=F).
Outside Air and Return Air Dampers
(Optional)
The outside air and return air dampers control the mixture of
return air and outside air drawn through the unit. Both dampers
are linked together and are controlled by an actuator requiring a
2-6VDC proportional signal. At 2V, the dampers are positioned
for full return air and no outside air. At 6V, the dampers are
positioned for full outside air and no return air. The outside air
damper shall open to a minimum position to provide ventilation
requirements when the room is occupied. When in heating
mode, if the space temperature is more than 4˚F from the
heating setpoint, the outside air damper shall fully close. The
outside air damper shall also be fully closed during unoccupied
mode. If the unit is equipped with a CO2 sensor, the outside air
damper shall modulate open proportionally to compensate for
the CO2 levels in the room.
The dampers can act as economizers for free-cooling. If
cooling is required and the outside air temperature is below
the economizer outside air lockout temperature (60˚F
recommended) and above 35˚F (adjustable), the outside air
damper shall modulate open. On units with a Carel controller,
the outside air damper shall fully open when the room
temperature is above the setpoint by more than 1˚F (adjustable).
Within 1˚F, the proportional band adjusts the outside air damper.
When the unit is in free-cooling, water valves shall be fully
closed, and if equipped, the face & bypass damper should move
to full bypass position. The outside air lockout temperature on
Carel units is factory set to 60˚F and is adjustable.
Chilled Water with Valve Control
Units with a chilled water coil and non-Carel controls desiring
valve control shall use a non-spring return modulating valve
operated by either a proportional (2-10VDC) or a tri-state
(24VAC) signal. Units with a chilled water coil and Carel controls
desiring valve control shall use a modulating valve requiring a
tri-state signal. When the room temperature is above the cooling
setpoint, the valve shall open proportionally according to the
adjustable proportional band. The adjustable proportional band
on the Carel controller is set to a default 1˚F (example: valve is
50% open when room temperature is 0.5˚F from setpoint). The
Carel controller will not allow the chilled water valve to open
when the outside air temperature is below 55˚F.
Chilled Water with Face & Bypass Control
Units equipped with a chilled water coil and face & bypass
control shall modulate the face & bypass damper via a spring
return actuator, controlled by a proportional signal (2-5.5V).
The face & bypass damper regulates the amount of return
air and outside air passing through the chilled water coil. On
a call for cooling, the damper shall open to the face of the
coil proportionally based on how many degrees the room
temperature is from the setpoint. The adjustable proportional
band on the Carel controller is set to a default 1˚F (example:
damper is 50% open when room temperature is 0.5˚F from
setpoint). When the damper is in full bypass position (2V), all
return and outside air bypasses the chilled water coil. When the
damper is in full face position (5.5V), all return and outside air
passes through the chilled water coil.
Direct Expansion (DX) Cooling Control
When the room temperature is above the cooling setpoint, the
compressor will be energized. The compressor will de-energize
when the room temperature falls below the cooling setpoint.
If the factory installed low limit stat detects indoor evaporator
coil temperatures below its set point, the compressor will be
disabled.
Hot Water or Steam with Valve Control
Units with a hot water or steam coil and non-Carel controls
and valve control shall use a spring-return, normally open
modulating valve operated by a proportional signal (2-10VDC)
or a tri-state (24VAC) signal. Units with Carel controls desiring
valve control shall use a modulating control valve with a
proportional signal. When the room temperature is below the
heating setpoint, the valve shall open proportionally according
to the adjustable proportional band. The adjustable proportional
band on the Carel controller is set to a default 1˚F (example:
valve is 50% open when room temperature is 0.5˚F from
setpoint). If for any reason the supply air temperature drops
below 55˚F (adjustable), the valve shall modulate open to
maintain 55˚F.
Hot Water with Face & Bypass Control
Units equipped with a hot water or steam coil and face & bypass
control shall modulate the face & bypass damper via a spring
return actuator, controlled by a proportional signal (2-5.5V).
The face & bypass damper regulates the amount of return air
and outside air passing through the heating coil. On a call for
heating, the damper shall open proportionally based on how
many degrees the room temperature is from the setpoint. The
adjustable proportional band on the Carel controller is set
to a default 1˚F (example: damper is 50% open when room
temperature is 0.5˚F from setpoint). When the damper is in full
bypass position (2V), all return and outside air bypasses the
heating coil. When the damper is in full face position (5.5V),
all return and outside air passes through the heating coil. If
for any reason the supply air temperature drops below 55˚F
(adjustable), the heating valve shall open (if equipped) and the
face and bypass damper shall modulate to maintain 55˚F.

9
14-500.5
SEQUENCE OF OPERATION
Hot Water and Chilled Water (2-Pipe) with
Valve Control
Units with valve control to provide heating and cooling on
a single water coil (2-pipe system) and not using Carel
controls shall use a spring-return, normally open modulating
valve operated by a proportional signal (2-10VDC) or a tri-
state (24VAC) signal. Units with Carel controls shall use a
modulating control valve with a proportional signal. On a call
for heating or cooling (depending on the season), the valve
shall open proportionally based on how many degrees the room
temperature is from the setpoint. The adjustable proportional
band on the Carel controller is set to a default 1˚F (example:
valve is 50% open when room temperature is 0.5˚F from
setpoint). If for any reason the supply air temperature drops
below 55˚F (adjustable), the water valve shall modulate open to
maintain 55˚F. On 2-pipe units not having Carel controls or not
connected to a network, an optional aquastat is recommended
to prevent inadvertent changeover of heating/cooling modes.
Hot Water and Chilled Water (2-Pipe) with
Face & Bypass Control
Units with face and bypass control to provide heating and
cooling on a single water coil (2-pipe system) shall modulate
the face & bypass damper via a spring return actuator,
controlled by a proportional signal (2-5.5V). The face &
bypass damper regulates the amount of return air and outside
air passing through the water coil. On a call for heating
or cooling (depending on the season), the damper shall
open proportionally based on how many degrees the room
temperature is from the setpoint. The adjustable proportional
band on the Carel controller is set to a default 1˚F (example:
damper is 50% open when room temperature is 0.5˚F from
setpoint). When the damper is in full bypass position (2V),
all return and outside air bypasses the water coil. When the
damper is in full face position (5.5V), all return and outside air
passes through the water coil. If for any reason the supply air
temperature drops below 55˚F (adjustable), the water valve
shall open (if equipped) and the face and bypass damper shall
modulate to maintain 55˚F.
2-Position Control Valves
Optional spring-return, 2-position control valves can be used to
control the end of cycle ow on both chilled and hot water coils.
On a chilled water coil, a normally closed valve is used. On a
hot water coil or 2-pipe changeover system, a normally open
valve is used.
The 2-position valve used on a chilled water coil shall open on a
call for cooling when the outside air temperature is greater than
55˚F (adjustable). When the outside air temperature is less than
55˚F, the valve should remain closed and free cooling shall be
utilized. The 2-position chilled water valve shall be closed when
the 2-position hot water valve is open (when equipped). The
valve is controlled by a 24VAC digital output.
The 2-position valve used on a hot water coil shall open on a
call for heating. The valve shall always open when the outside
air temperature drops below 40˚F. This is to prevent the coil
from freezing or nuisance tripping of the freeze stat. The
2-position hot water valve shall be closed when the 2-position
chilled water valve is open (if equipped). The valve is controlled
by a 24VAC digital output.
The 2-position valve used on a 2-pipe changeover system shall
operate like the 2-position chilled water valve in cooling mode,
and like the 2-position hot water valve in heating mode.
Condensate Pump (Optional)
On units equipped with a condensate pump, the pump shall
begin to run once the condensate reaches a set level. The
pump comes with an internal safety switch that can be wired
either normally open or normally closed. The safety switch shall
be wired such that the chilled water valve closes when it trips.
On Carel units, the switch shall be wired normally closed into
a digital input of the controller. If the unit is also equipped with
a condensate pan oat switch, both switches shall be wired in
series.
Condensate Pan Float Switch (Optional)
On units equipped with a condensate pan oat switch, the
normally closed switch shall be wired such that the chilled
water valve closes or the outdoor condensing unit is disabled
(DX Cooling Models Only) upon tripping. On Carel units, the
switch shall be wired normally closed into a digital input of the
controller. If the unit is also equipped with a condensate pump,
both the condensate pump limit switch and condensate pan oat
switch shall be wired in series.
CO2Sensor (Optional)
An optional CO2sensor with a range of 0-2000 ppm producing
an output signal of 4-20mA is available to modulate the outside
air damper. If equipped, the outside air damper shall modulate
open proportionally to compensate for the CO2levels in the
room. On Carel units, if the CO2level is 800 ppm or less
(adjustable), the damper shall remain at its normal minimum
position. If the CO2level increases above 800 ppm, the
damper begins to open according to the proportional band.
The proportional band is set to a default of 200 ppm and is
adjustable. Using the default, once the CO2level reaches 1000
ppm, the damper shall be at its maximum ventilation position.

10 14-500.5
START-UP SHEET - EXAMPLE
Figure 10.1 - Start-Up Sheet - EXAMPLE Page 1

11
14-500.5
START-UP SHEET - EXAMPLE
Figure 11.1 - Start-Up Sheet - EXAMPLE Page 1

12 14-500.5
DIMENSIONAL DATA
Figure 12.1 - Dimensions - 16-5/8" Depth - Floor Mounted Unit
Table 12.2 - Unit Width Dimensions
Model Size Dimensions (inches)
W1 W2 W3
750 62 36 30
1000 74 48 42
1250 86 60 54
1500 98 72 66

13
14-500.5
DIMENSIONAL DATA
Figure 13.1 - Dimensions - 21-7/8" Depth - Floor Mounted Unit
Table 13.3 - Unit Width Dimensions
Model Size Dimensions (inches)
W1 W2 W3
750 62 36 30
1000 74 48 42
1250 86 60 54
1500 98 72 66

14 14-500.5
DIMENSIONAL DATA
Figure 14.1 - Dimensions - Front Discharge - Ceiling Mounted Unit
Table 14.1 - Unit Width Dimensions
Model Size Dimensions (inches)
W1 W2
750 62 36
1000 74 48
1250 86 60
1500 98 72

15
14-500.5
DIMENSIONAL DATA
Figure 15.1 - Dimensions - Down Discharge - Ceiling Mounted Unit
Table 15.1 - Unit Width Dimensions
Model Size Dimensions (inches)
W1 W2
750 62 36
1000 74 48
1250 86 60
1500 98 72

16 14-500.5
COOLING PIPING LOCATIONS - FLOOR UNITS ONLY
CHILLED WATER - NO PIPING PACKAGE
Figure 16.1 - Chilled Water Coil with or without Option-
al Reheat Coil
.88
3.37
.88
3.37
CHILLED
WATER COIL
CHILLED
WATER COIL
REHEAT
COIL
REHEAT
COIL
AIR FLOW
D
B
C
A
H
F
E
G
S
RS
R
AIR FLOW
LEFT HAND CONNECTIONS RIGHT HAND CONNECTIONS
COND.
DRAIN
COND.
DRAIN
RA RA
S = Supply
R = Return
Figure 16.2 - Chilled Water Coil with Pre-Heat Coil
3.37
.88
CHILLED
WATER COIL
PREHEATCOIL
PREHEAT COIL
RA
D
B
C
A
R
AIR FLOW
.88
3.37
CHILLED
WATER COIL
RA
G
E
H
F
S
R
AIR FLOW
LEFT HAND CONNECTIONS RIGHT HAND CONNECTIONS
COND.
DRAIN
COND.
DRAIN
S
S = Supply
R = Return
Note:Supply and Return connection locations represent counterow orientation (recommended). Unit should be piped in
accordance with good plumbing practices.
Table 16.1 - Piping Location Dimensions j
Unit Depth 16 5/8 21 7/8
Coil Rows 2 3 4234
Dimensions (in.)
A 14.25 15.00 15.00 14.25 15.00 15.00
B 11.25 11.00 11.00 16.50 16.25 16.25
C 7.25 7.50 7.50 7.25 7.50 7.50
D 4.75 4.75 4.75 10.00 10.00 10.00
E 13.50 13.50 14.00 13.50 13.50 14.00
F 12.25 12.00 11.75 17.50 17.25 17.00
G 8.25 8.75 9.50 8.25 8.75 9.50
H 4.00 3.50 3.00 10.00 8.75 8.25
j For Hot Water Reheat piping locations see Figure 18.2. For Steam Reheat
piping locations see Figure 19.2.
Table 16.2 - Piping Location Dimensions j
Unit Depth 16 5/8 21 7/8
Coil Rows 2 3 4234
Dimensions (in.)
A 17.50 17.50 16.75 17.50 17.50 16.75
B 8.75 8.75 9.25 14.00 14.00 14.50
C 10.50 10.00 9.25 10.50 10.00 9.25
D 2.25 2.75 3.25 7.50 8.00 8.50
E 16.50 16.00 16.00 16.50 16.00 16.00
F 9.50 10.00 10.00 14.75 15.25 15.25
G 11.50 11.25 11.25 11.50 11.25 11.25
H 1.50 1.50 1.50 6.75 6.75 6.75
j For Hot Water Pre-Heat piping locations see Figure 18.1. For Steam
Pre-Heat piping locations see Figure 19.1.

17
14-500.5
COOLING PIPING LOCATIONS - FLOOR UNITS ONLY
Figure 17.1 - DX Cooling (Size 750) with or without
Optional Reheat Coil
RA RA
.88
3.37
LL
SL
DX COIL
B
A
8.17
8.86
HEATING
COIL
HEATING
COIL
SL
LL
C
D
13.74
10.93
3.37
.88
DX COIL
AIR FLOW AIR FLOW
LEFT HAND CONNECTIONS RIGHT HAND CONNECTIONS
COND.
DRAIN
COND.
DRAIN
LL = Liquid Line
SL = Suction Line
Figure 17.2 - DX Cooling (Size 750) with Pre-Heat Coil
RARARA
C
D
17.32
14.42
HEATING
COIL
L
L
SL
DX COIL
B
A
11.33
12.03
3.37
.88
HEATING
COIL
SL
LL
3.37
.88
DX COIL
RIGHT HAND CONNECTIONS
AIR FLOW AIR FLOW
LEFT HAND CONNECTIONS
COND.
DRAIN
COND.
DRAIN
LL = Liquid Line
SL = Suction Line
Table 17.1 - DX Cooling Coil Piping Locations j
Unit Depth Model Size Dimensions (inches)
A B C D
16 5/8 750 14.25 11.25 7.25 4.75
21 7/8 750 14.25 16.50 7.25 10.00
jFor Hot Water Reheat piping location see Figure 18.2. For Steam Reheat piping location see Figure 19.2.
For Hot Water Pre-Heat piping location see Figure 18.1. For Steam Pre-Heat piping location see Figure 19.1.
DIRECT EXPANSION (DX) SIZE 750 ONLY - NO PIPING PACKAGE
Figure 17.3 - DX Cooling (Size 1000-1500) with or
without Optional Reheat Coil
RA
LL
DX COIL
10.16
7.50
B
3.37
A
.88
RA
13.49
13.04
3.37
.88
CD
SL
LL
DX COIL
HEATING
COIL
HEATING
COIL
SL
AIR FLOW AIR FLOW
LEFT HAND CONNECTIONS RIGHT HAND CONNECTIONS
COND.
DRAIN
COND.
DRAIN
LL = Liquid Line
SL = Suction Line
Table 17.2 - DX Cooling Coil Piping Locations j
Unit Depth Model Size Dimensions (inches)
A B C D
16 5/8 1000, 1250, 1500 7.50 4.50 11.75 10.50
21 7/8 1000, 1250, 1500 12.75 9.75 17.00 15.75
jFor Hot Water Reheat piping location see Figure 18.2. For Steam Reheat piping
location see Figure 19.2.
DIRECT EXPANSION (DX) SIZE 1000-1500 - NO PIPING PACKAGE DX
Figure 17.4 - DX Cooling (Size 1000-1500) with Pre-
Heat Coil
RA
.88
3.37
A
B
C
D
.88
3.37
SL
LL
SL
LL
DX COIL
HEATING
COIL
DX COIL
RA
16.65
16.20
13.32
10.66
HEATING
COIL
AIR FLOW AIR FLOW
LEFT HAND CONNECTIONS RIGHT HAND CONNECTIONS
COND.
DRAIN
COND.
DRAIN
LL = Liquid Line
SL = Suction Line
Table 17.3 - DX Coil with Pre-Heat Piping Locations j
Unit Depth Model Size Dimensions (inches)
A B C D
16 5/8 1000, 1250, 1500 4.50 1.75 8.75 7.75
21 7/8 1000, 1250, 1500 9.75 7.00 14.00 13.00
jFor Hot Water Pre-Heat piping location see Figure 18.1. For Steam Pre-Heat
piping location see Figure 19.1.

18 14-500.5
HEATING PIPING LOCATIONS - FLOOR UNITS ONLY
Figure 18.1 - Hot Water Only or Chilled Water/DX Cooling Coil with Hot Water Pre-Heat Coil
.88
3.37
.88
3.37
HW COIL
HW COIL
COOILNG
COIL
COOLING
COIL
RARA
DB
C
A
H
F
G
E
S
RS
R
AIR FLOW AIR FLOW
LEFT HAND CONNECTIONS RIGHT HAND CONNECTIONS
COND.
DRAIN
COND.
DRAIN
S = Supply
R = Return
Note:Supply and Return connection locations represent counterow orientation (recommended). Unit should be piped in
accordance with good plumbing practices.
Table 18.1 - Hot Water Heating Coil Piping Locations j
Unit Depth Coil Rows Dimensions (inches)
A B C D E F G H
16 5/8 1-Row 14.25 11.50 7.00 5.00 13.50 12.00 8.25 4.00
2-Row 14.25 11.25 7.25 4.75 13.50 12.25 8.25 4.00
21 7/8 1-Row 14.25 16.75 7.00 10.25 13.50 17.25 8.25 9.25
2-Row 14.25 16.50 7.25 10.00 13.50 17.50 8.25 9.25
jFor Chilled Water piping location see Figure 16.2. For DX Cooling piping location see Figure 17.2 and Figure 17.4.
Figure 18.2 - Hot Water Reheat Coil with Chilled Water/DX Cooling Coil
Note:Supply and Return connection locations represent counterow orientation (recommended). Unit should be piped up in
accordance with good plumbing practices.
Table 18.2 - Hot Water Reheat Coil Piping Locations j
Unit Depth Coil Rows Dimensions (inches)
A B C D E F G H
16 5/8 1-Row 17.50 8.75 10.25 2.25 16.75 9.50 11.50 1.25
2-Row 17.50 8.75 10.50 2.25 16.50 9.50 11.50 1.50
21 7/8 1-Row 17.50 14.00 10.25 7.50 16.75 14.75 11.50 6.50
2-Row 17.50 14.00 10.50 7.50 16.50 14.75 11.50 6.75
jFor Chilled Water piping location see Figure 16.1. For DX Cooling piping location see Figure 17.1 and Figure 17.3.
HOT WATER HEATING COIL - NO PIPING PACKAGE

19
14-500.5
HEATING PIPING LOCATIONS - FLOOR UNITS ONLY
Figure 19.1 - Steam Heating Coil Only or Chilled
Water/DX Cooling Coil with Steam Pre-Heat Coil
RA
3.37
.88 .88
RA
3.37
7.35
1
4.30
BA
S
R
STEAMCOIL
7.35
14.30
B
A
STEAM COIL
COOLING
COIL
COOLING
COIL
AIR FLOW AIR FLOW
LEFT HAND CONNECTIONS RIGHT HAND CONNECTIONS
COND.
DRAIN
COND.
DRAIN
S
R
S = Supply
R = Return
Table 19.1 - Steam Heating Coil Piping Locations j
Unit Depth Coil Rows Dimensions (inches)
A B
16 5/8 1-Row 12.25 4.00
21 7/8 1-Row 17.50 9.25
jFor Chilled Water piping location see Figure 16.2. For DX Cooling piping
location see Figure 17.2 and Figure 17.4.
STEAM HEATING COIL - NO PIPING PACKAGE
Figure 19.2 - Steam Reheat Coil with Chilled Water/DX
Cooling Coil
.88
RA
3.37
.88
3.37
S
R
STEAMCOIL
10.51
17.46
A
B
COOLING
COIL
STEAM COIL
S
R
B
A
17.4
6
10.51
RA
COOLING
COIL
AIR FLOW AIR FLOW
LEFT HAND CONNECTIONS RIGHT HAND CONNECTIONS
COND.
DRAIN
COND.
DRAIN
S = Supply
R = Return
Table 19.2 - Steam Reheat Coil Piping Locations j
Unit Depth Coil Rows Dimensions (inches)
A B
16 5/8 1-Row 9.50 1.25
21 7/8 1-Row 14.75 6.50
jFor Chilled Water piping location see Figure 16.1. For DX Cooling piping
location see Figure 17.1 and Figure 17.3.

20 14-500.5
COOLING PIPING LOCATIONS - FLOOR UNITS ONLY
Figure 20.1 - Chilled Water Coil with or without Option-
al Reheat Coil
j Condensate drain connection located in right end compartment.
CHILLED WATER - WITH PIPING PACKAGE
Figure 20.2 - Chilled Water Coil with Pre-Heat Coil
j Condensate drain connection located in right end compartment.