Operation Manual
MicroTechTM U nit Ventilator Controller
Sequences of Operation
AAF-HermanN elson Classroom Unit Ventilator
Model AEQ, AED, Air Sour ce Heat Pump
Program UV1: Air Source Heat Pump with Electric Heat
OM 101-1
Group: Unit V entilator
Part No.: 106101201
Date: July 1999
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Software ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Air Source Heat Pump with Electric Heat . . . . . . . . . . . 3
Description of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Occupied or Tenant Override Operating Mode . . . . . . 3
Unoccupied Operating Mode . . . . . . . . . . . . . . . . . . . . 4
Emergency Heat Mode . . . . . . . . . . . . . . . . . . . . . . . . 4
Defrost Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Discharge Air Low Limit Control . . . . . . . . . . . . . . . . . 4
Safeties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Sequence Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Introduction
This manual describes the sequences of operation for MicroTech
controlled AAF-HermanNelson unit ventilators equipped with air
source heat pump (ASHP) heating and cooling, and supplemental
electric heating. Unit ventilators with this heating and cooling
configuration will be AAF-HermanNelson model AED, AEQ.
Regardless of the AAF-HermanNelson model type, the Unit V entilator
Controller (UVC) provided with these units uses program UV1***.
For more information on the MicroTech Unit Ventilator Controller,
refer to Bulletin No. IM613, “MicroTech Unit Ventilator Controller.”
General Information
Software ID
The Unit Ventilator Controller Software must be compatible with the
unit ventilator heating and cooling configuration. The software is identified
by a program code and “software model” number printed on a small
label attached to the controller. Model AE with ASHP heating and cooling
uses program UV1***. The first wild card character defines the UVC
communication type as follows: S = stand-alone, M = master / slave,
and N = network code. The last two wild card characters denote the
software version (numeric) and revision le vel (alphabetical) respectively .
Program UV1*** comprises only one software model: MDL00.
Table 1. UVC Setpoints
Setpoint
Description Abbreviation
Occupied cooling setpoint OCS Hardware setpoint Room Setpoint -Ventilation cooling setpoint VCS Software offset (below OCS) Vent Clg Offset 2oF
Setpoints
Most UVC setpoints are either “hardware” or “software”
adjustable. Hardware adjustable means there is an on-board
potentiometer used for adjustment. Software adjustable means a
PC equipped with Monitor software and proper cable
connection is required to make an adjustment. Default software
adjustable values are shown on the sequence charts. Hardware
adjustable values shown on the charts are for example only.
Several UVC setpoints are defined by offsets relative to other
setpoints. Table 1 summarizes these setpoints and offsets.
Defined By Label
Default
Value
Occupied heating setpoint OHS` Software offset (below OCS) Occ RmT Spt Difl 6oF
Unoccupied heating setpoint UHS Hardware offset (below OHS)
Unoccupied cooling setpoint UCS Hardware offset (above OCS)
Electric heat lockout EHLO Software setpoint OAT EI Ht Lkout 20oF
Compressorized cooling lockout CCLO Not adjustable -- 59oF
Ventilation cooling lockout VCLO Software setpoint OAT Vent Clg Lkout 64oF
Ventilation cooling discharge air low limit VCLL Software setpoint DAT Vent Clg Low 55oF
DX cooling discharge air low limit DXLL Software setpoint DAT DX Clg Low 45oF
Outdoor air lockout OALO Software setpoint OALO Setpoint 35oF
Unocc Offset --
OM 101-1 / Page 2 (Rev. 7/99)
Air Source H eat Pump with Electric Heat
Description of Operation
Definitions
Control T emperature
In order to maintain more stable room temperature control, the
MicroTech Unit Ventilator Controller (UVC) uses the concept of a
“Control Temperature.” The Control Temperature is a weighted v alue
equal to 19/20 room temperature and 1/20 discharge air temperature.
Setpoint Abbreviations
OCS Occupied cooling setpoint
VCS Ventilation cooling setpoint
OHS Occupied heating setpoint
UHS Unoccupied heating setpoint
UCS Unoccupied cooling setpoint
VCLO Ventilation cooling outdoor air lockout setpoint
EHLO Electric heat outdoor air lockout setpoint
VCLL Ventilation cooling discharge air low limit setpoint
DXLL DX cooling discharge air low limit setpoint
OALO Outdoor air lockout setpoint
Software ID
Program: UV1***
Software Model: MDL00
Occupied or Tenant Override Operating Mode
The supply fan will run continually in the occupied or tenant override
operating modes.
When the UVC is first energized it will perform a self-calibration
procedure upon the OA damper actuator . The calibr ation procedure
will take approximately 5 minutes to perform during which time the
supply fan will not operate.
The UVC provides a compressor minimum on time of 2 minutes and
a minimum off time of 3 minutes.
If enabled, an outdoor air lockout setpoint has been pro vided to force
the OA damper to close when the OA temperature goes below the
OALO setpoint (software adjustable). This feature is typically used
only on valve control hydronic heat and or hydronic cool units. This
feature is disabled by default in UV Model 00.
If provided, the optional ventilation lock out feature can ov erride UVC
temperature control and keep the OA damper closed as required.
If provided, the optional exhaust fan output will energize when the
OA damper opens and de-energize when the OA damper closes.
If provided, the optional auxiliary heat output will operate a normally
open device. The auxiliary output will energize (close the device)
when the Control Temperature is abov e the OHS. The auxiliary output
will de-energize (open the device) when the Control T emperature is
o
3
F below the OHS.
The same UVC output is used for both the auxiliary heat output
feature and the exhaust f an output f eature . Therefore , both f eatures
cannot be used together.
Note: When switching from unoccupied-to-occupied mode the OA
damper will remain closed for the first 5-minutes of occupied operation.
Morning Start
If the space is cool and heating is required, the unit will operate as
described in “Heating Operation” belo w. The outdoor air (OA) damper
will remain closed until the Control Temperature rises to within 3
of the OHS setpoint. Then it will be opened to minimum position.
If the space is warm and cooling is required, the unit will operate as
described in “Cooling Operation” below. If the outdoor air is not
suitable for free cooling, the OA damper will remain closed until the
Control Temperature falls to within 3
o
F of the OCS setpoint. Then it
will be opened to minimum position.
o
Cooling Operation
Certified Drawing
When the Control Temperature is greater than the OHS setpoint and
less than the VCS setpoint, the O A damper will be held at its minimum
position setpoint (hardware adjustable). As the Control Temperature
rises and cooling becomes necessary, the UVC will decide whether
the outdoor air is suitable for free cooling by comparing the outdoor
air temperature (dry bulb) to the VCLO setpoint.
If the OA temperature is less than or equal to the VCLO setpoint,
the economizer will modulate as required to maintain the VCS
setpoint (default = 2
o
F less than OCS). The Control T emper ature will
rise if the outdoor air is too warm to satisfy the cooling load. If the
OA damper is more than 85% open, mechanical cooling will be
energized when the Control Temperature rises to the OCS setpoint.
If the OA temperature is warmer than the VCLO setpoint, mechanical
cooling will be energized when the Control Temperature rises to the
OCS setpoint. The OA damper will be held to the minimum position
setpoint, except when the OA temperature is warmer than the VCLO
setpoint and the Control Temperature is 3
o
F or more above the OCS.
In this unlikely situation, the OA damper will be closed.
Once the compressor is energized, the start-to-stop (minimum on)
timer will override normal temperature control maintaining compressor
operation for the minimum on time. The compressor will be deenergized when the Control Temperature f alls below the OCS setpoint.
Note: Regardless of the economizer state, its operation is subject
to discharge air low limit control.
Note: During normal (non-alarm) operation, the compressor will be
disabled if any of the following conditions exist:
• OA temperature less than the CCLO setpoint
• Discharge air temperature less than the DXLL setpoint
• Stop-to-start (minimum off) timer has not expired
• Emergency heat mode active
Heating Operation
When the Control Temperature is greater than the OHS setpoint
and less than the VCS setpoint, the OA damper will be held at its
minimum position setpoint.
If the Control Temperature f alls to 1
o
F greater than the OHS setpoint,
the reversing valve will be energized in preparation for mechanical
(heat pump) heating.
The compressor will be energized when the Control Temperature
falls to 1
o
F below the OHS setpoint. Once the compressor is
energized, the start-to-stop (minimum on) timer will override normal
temperature control maintaining compressor operation for the
minimum on time. The compressor will be de-energized when the
Control Temperature rises above the OHS setpoint.
Normally, supplemental electric heat is enabled when the OA
temperature drops below the EHLO setpoint. It can also be enabled
by the emergency heat, defrost cycle, or “v ent cooling” discharge air
low limit functions. If the electric heat is enabled and the Control
Temperature drops to 2
o
F below the OHS setpoint, the two or three
(optional) stages of electric heat will be energized as required. A
“stage-up” interstage dela y timer (default = 30 seconds) must expire
before each subsequent stage is energized. When the Control
Temperature rises to 1
o
F below the OHS setpoint, the electric heat
stages will be de-energized using a “stage-down” interstage delay
timer (default = 30 seconds).
F
The OA damper will maintain its minimum position when the Control
Temperature is within 3
o
F of the OHS. If the Control Temperature
falls to 3oF or more below the OHS, the OA damper will be closed.
When heating is no longer required and the Control Temperature
rises to 2
energized. Note that in addition to the 1
o
F above the OHS setpoint, the re v ersing valve will be de-
o
F offset between the
compressor and reversing v alve de-energization points, a time dela y
OM 101-1 / Page 3 (Rev. 7/99)
(default = 60 seconds) will prevent the compressor and reversing
valve from de-energizing simultaneously. The timer is set when the
compressor is de-energized.
Note: During normal (non-alarm) operation, the compressor will be
disabled if any of the following conditions exist:
• Stop-to-start (minimum off) timer has not expired
• Emergency heat mode active
Unoccupied Operating Mode
The outdoor air damper will always be closed when the unit is in the
unoccupied operating mode.
The indoor fan will remain off when the unit is in the unoccupied
mode unless heating or cooling are required (see note below).
Note: During the unoccupied mode, if the fan remains off continually
for 60-minutes, it will start and run for 5-minutes. During the
unoccupied mode the indoor fan will also start and run if the DA
temperature becomes greater than the room temperatures plus 12
and continue to run until the DA temperature is equal to or less than
the room temperature plus 7
o
F.
Cooling Operation
The fan and compressor will be energized when the Control
Temperature rises to the UCS setpoint (nee note below).
Once the compressor is energized, the start-to-stop (minimum on)
timer will override normal temperature control maintaining
compressor operation for the minimum on time. The compressor will
be de-energized when the Control Temperature f alls below the UCS
setpoint.
The fan will also be de-energized when the Control Temperature
falls below the UCS setpoint; however, it is interlocked so that it will
not stop before the compressor stops.
Note: During normal (non-alarm) operation, the compressor will be
disabled if any of the following conditions exists:
• OA temperature less than the CCLO setpoint (59
o
F, fixed)
• Discharge air temperature less than the DXLL setpoint
• Stop-to-start (minimum off) timer has not expired
• Emergency heat mode active
Heating Operation
If the Control Temperature f alls to 1
o
F greater than the UHS setpoint,
the reversing valve will be energized in preparation for mechanical
(heat pump) heating.
The fan will be energized when the Control Temperature f alls belo w
the UHS setpoint.
The compressor will be energized when the Control Temperature
falls to 1
o
F below the UHS setpoint. Once the compressor is
energized, the start-to-stop (minimum on) timer will override normal
temperature control maintaining compressor operation for the
minimum on time. The compressor will be de-energized when the
Control Temperature rises above the UHS setpoint.
Normally, supplemental electric heat is enabled when the OA
temperature drops below the EHLO setpoint. It can also be enabled
by the emergency heat or defrost cycle functions. It the heat is enabled
and the Control Temperature drops to 2
o
F below the UHS setpoint,
the two or three (optional) stages of electric heat will be energized as
required. A “stage-up” interstage delay timer (default = 30 seconds)
must expire before each subsequent stage is energized. When the
Control Temperature rises to 2
o
F above the UHS setpoint, the electric
heat stages will be de-energized using a “stage-down” interstage delay
timer (default = 30 seconds). If the Control Temperature is between
the stage-up and stage-down points, no staging action will occur .
The fan will be de-energized when the Control Temperature rises
above the UHS setpoint; however, it is interlocked so that it will not
stop before the compressor and all electric heat stages are off.
o
When heating is no longer required and the Control Temperature
rises to 2
o
F above the UHS setpoint, the reversing valve will be deenergized. Note that in addition to the 1oF offset between the
compressor and reversing v alve de-energization points, a time delay
(default = 60 seconds) will prevent the compressor and reversing
valve from de-energizing simultaneously. The timer is set when the
compressor is de-energized.
Note: During normal (non-alarm) operation, the compressor will be
disabled if any of the following conditions exist:
• Stop-to-start (minimum off) timer has not expired
• Emergency heat mode active
Emergency Heat Mode
The emergency heat mode is initiated by depressing the momentary ,
unit-mounted emergency heat switch. When the unit is in the
emergency heat mode, the following actions occur:
• Compressor is immediately de-energized and locked out
F
• Reversing valve is de-energized after delay (default = 60
seconds)
• Electric heat is staged to maintain the room heating setpoint
(OHS or UHS) regardless of entering water temperature
The unit ventilator can be returned to normal operation by cycling
power to the UVC.
Defrost Cycle
The defrost cycle will prevent frost from building up on the outdoor
coil when the unit is in heating mode. It is initiated by an external
defrost control which provides a maintained contract closure to the
UVC when defrost is required. When the unit is in the defrost cycle ,
the following actions occur:
• Reversing valve is de-energized (unit enters “cooling” cycle)
• Electric heat is staged to maintain the room heating setpoint
(OHS or UHS) regardless of outdoor air temperature
• Compressor cannot be de-energized by room temperature
control until defrost control opens its contacts
When the defrost control opens its contacts, normal operation will
resume. The e xternal defrost control determines the start and length
of the defrost cycle.
External Defrost Control Operation
When the compressor is energized, the defrost control will be
enabled. The defrost control will then start a 90-minute timing cycle
after which it will check the outdoor coil temperature. If the coil
temperature is 28
o
F or less at the end of any timing cycle, the defrost
control will de-energize the outdoor coil fan, provide the defrost cycle
contact closure to the UVC, and set a 10-minute timer.
The defrost control will open its contacts and end the defrost cycle when
either the coil temperature rises to 55
o
F or the 10-minute timer expires.
Discharge Air Low Limit Control
There are two discharge air low limit functions: the “DX cooling” low
limit and the “vent cooling” low limit. The vent cooling low limit function
prevents the discharge air (DA) temperature from falling below the
VCLL setpoint whenever mechanical cooling is not necessary; when
mechanical cooling is necessary , the vent cooling low limit function is
disabled. The DX cooling low limit function pre vents the DA temperature
from falling below the DXLL setpoint whene ver the compressor is on.
Vent Cooling Low Limit (Mechanical Cooling Inactive)
If the DA temperature falls below the VCLL setpoint, the following
sequence will occur:
1. The OA damper modulates toward (or remains at) minimum
position
2. If the actual OA damper position is less than or equal to the
minimum setpoint, the electric heat will stage up as required to
prevent the D A temperature from f alling below the VCLL setpoint.
OM 101-1 / Page 4 (Rev. 7/99)
The stage-up interstage delay timer (default = 30 seconds) must
expire before each subsequent stage is energized
3. If the OA temperature is less than or equal to the VCLO setpoint
and the DA temperature remains below the VCLL setpoint after all electric heat stages have been energized (unlikely), the
OA damper will be closed
If the DA temperature rises to the VCLL setpoint at any time, the
above sequence will be executed in reverse until normal operation
resumes. (Electric heat stages will be de-energiz ed using the stagedown interstage timer.)
Note: The vent cooling discharge air low limit function is disabled
during the unoccupied mode.
DX Low Limit (Mechanical Cooling Active)
If the DA temperature falls below the DXLL setpoint, the following
will occur:
1. The compressor is immediately de-energized
2. The DXLL wait timer is set (default = 2 minutes). The v ent cooling
low limit function is disabled during the DXLL wait time period
If the DA temperature rises abov e the VCLL setpoint bef ore the timer
expires, normal operation will resume.
If the DA temperature remains below the VCLL setpoint until the timer
expires, the v ent cooling low limit function will be enabled (see above).
Safeties
High Pressure
A normally closed refrigerant high pressure switch is provided to
detect refrigerant high pressure conditions. The high pressure s witch
cut out is 400 psig +/– 10 and the cut in is 300 psig +/– 20. When the
UVC detects high pressure conditions the following will occur:
• The compressor will be immediately de-energized
• The “High Pressure” fault will be indicated by the UVC
• If the switch remains open or the fault remains active (when
manual reset is required) and heating is required, electric heat
will stage as needed to maintain the current heating setpoint
When the alarm conditions are gone, the fault will automatically reset
with the first 2-occurrences allowing operation to return to normal. If
a third fault occurs within 1-week the fault must be manually reset
by cycling power to the UVC after the alarm conditions are gone.
Certified Drawing
Cycling power after the third fault resets this sequence.
Low DX Coil Temperature
A normally closed low temperature switch is provided to detect low
refrigerant temperature conditions within the indoor air coil. The low
temperature switch cut out is 30
When the UVC detects the possibility of low temperatures for longer
than 5-seconds (fixed) the following will occur:
• The compressor will be immediately de-energized
• The “Low DX Coil T emperature” fault will be indicated b y the UVC
• If the switch remains open or the fault remains active (when
manual reset is required) and heating is required, electric heat
will stage as needed to maintain the current heating setpoint
When the alarm conditions are gone, the fault will automatically reset
with the first 2-occurrences allowing operation to return to normal. If
a third fault occurs within 1-week the fault must be manually reset
by cycling power to the UVC after the alarm conditions are gone.
Cycling power after the third fault resets this sequence.
Brownout
If the UVC detects low line voltage conditions that persist f or at least
10 seconds (2 seconds for electric heat), the compressor and all
electric heat stages will be immediately de-energized and the
“Brownout” fault will be indicated. The brownout alarm setpoint is
equivalent to approximately 85% of the nameplate voltage value.
The Brownout fault will automatically reset when the line voltage
remains at or above 90% of the nameplate v alue for at least 5 minutes.
Note: The four brownout parameters above are PC adjustable,
however, it is recommended that they not be changed.
o
F +/– 4 and the cut in is 50o F +/– 6.
OM 101-1 / Page 5 (Rev. 7/99)
Sequence Charts
The following charts graphically summarize the expected sequences
of operation for this unit ventilator configuration. The charts are all
charts. Refer to bulletin No. IM 613, “MicroTech Unit Ventilator
Controller” f or more information.
based upon factory default setpoints. The output states indicated on
the charts will typically exist for a particular control temperature,
howev er, e xceptions will occur when other control features are active
or when alarm conditions exist or when factory defaults are changed.
Software ID
Program: UV1***
Software Model: MDL00
Brief descriptions of the control feature exceptions are noted on the
Outdoor Air Temperature Dependent Functions
Outdoor Air Temperature (oF)
UVC
Function
Economizer Cooling Available 1, 5, 6, 7
Compressor Cooling Available 2
Electric Heat Available 4
Outdoor Air Lockaout Available 3
Indicated state
(default setpoints)
Outdoor Air Temperature Dependent Function Notes:
1. Economizer cooling will be unavailable when OA is above VCLO
2. Compressorized cooling lockout (CCLO) prevents compressorized cooling when the OA temperature is below OCLO
3. OA lockout feature is disabled from the f actory in UV Model 00, when enabled the O A damper will be f orced closed if O A temper ature is belo w OALO
4. Electric heat will be made available when one or more of the following conditions exist:
• OA temperature less than EHLO
• Emergency heat mode is active
• Defrost cycle is active
• Vent cooling discharge air low limit function is active
• High pressure or low DX coil temperature faults prevent compressorized heating
5. In very humid locations VCLO can be lowered to limit the economizer function
6. Never lower VCLO below CCLO or a cooling deadband will be created
7. In locations where humidity is of no concern, VCLO can be raised slightly to allow additional economizer cooling
Indicated
State
Notes
Indicated state dependent on
differential (default setpoints)
EHLO OALO CCLO VCLO
19 20 21 34 35 36 58 59 60 63 64 65
OM 101-1 / Page 6 (Rev. 7/99)
Occupied Mode
4
4
4
0
6
Control T emper ature (
UVC
Output
Supp. Electric Heat Staging 7,14,16
Emer. Electric Heat Staging 7,11,12,14,16
Reversing V alv e On (Heat) 10,12
Compressor Enabled 4,6,8,9,11,13,14
OA Damper Minimum Pos. 1,5,15
Indicated state
(default setpoints)
Occupied Mode Notes:
1. The vent cooling discharge air low limit function can affect OA damper position
2. Economizer cooling will be unavailable when OA is above VCLO
3. Economizer cooling, when available, will work in conjunction with compressorized cooling dependent upon indoor temperature
4. In economizer mode, when cooling is required, the OA damper must be greater than 85% open before compressor cooling is enabled
5. Indoor temperature can affect OA damper operation
6. Compressorized cooling lockout (CCLO) prevents compressorized cooling when the OA temperature is below CCLO
7. Electric heat will be made available when one or more of the following conditions exist:
• OA temperature less than EHLO
• Emergency heat mode is active
• Defrost cycle is active
• Vent cooling discharge air low limit function is active
• High pressure or low DX coil temperature faults prevent compressorized heating
8. Compressorized cooling can be affected by the DX cooling discharge air low limit function
9. Minimum on (2-minutes) and minimum off (3-minutes) timers can affect compressor operation
10. The reversing valve delay (60 seconds) must expire before the reversing valve turns off
11. In emergency heat mode the compressor is disabled in heating and in cooling
12. In emergency heat mode the reversing valve remains de-energized
13. High pressure and low DX coil temperature can affect compressor operation
14. The brownout function can affect compressor and electric heat operation
15. The outdoor air lockout option, if enabled, can affect OA damper position
16. When within the areas indicated abov e, electric heat will be staging up or will be on; outside the areas indicated, electric heat will be staging down or will be off
Indicated
Notes
State
Economizer 1,2,3,5,15
Closed 1,5
Indicated state dependent on
differential (default setpoints)
Certified Drawing
OHS VCS OCS
64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81
23
23
Indicated state dependent on OA
23
temperature (default setpoints)
o
F)
234567890123456789
2345
OM 101-1 / Page 7 (Rev. 7/99)
Unoccupied Mode
5
5
5
1234567890123
1
3
1234567890123
UVC
Output
Supp. Electric Heat Staging 4,8,9,11
Emer. Electric Heat Staging 4,8,9,11
Indicated
State
Notes
o
Control T emper ature (
F)
UHS UCS
58 59 60 61 62 85 86 87
Reversing V alv e On (Heat) 7
Compressor Enabled 3,5,6,10,11
Indoor Fan Off 2
234
Indicated state
(default setpoints)
Indicated state dependent on
differential (default setpoints)
234
Indicated state dependent on OA
234
temperature (default setpoints)
Unoccupied Mode Notes:
1. The OA damper remains closed in unoccupied mode
2. The indoor fan will remain off in unoccupied mode when the compressor and all electric heater stages are off
3. Compressorized cooling lockout (COLO) prevents compressorized cooling when the OA temperature is below COLO
4. Electric heat will be made available when one or more of the following conditions exist:
• OA temperature less than EHLO
• Emergency heat mode is active
• Defrost cycle is active
• Vent cooling discharge air low limit function is active
• High pressure or low DX coil temperature faults prevent compressorized heating
5. Compressorized cooling can be affected by the DX cooling discharge air low limit function
6. Minimum on (2-minutes) and minimum off (3-minutes) timers can affect compressor operation
7. The reversing valve delay (60 seconds) must expire before the reversing valve turns off
8. In emergency heat mode the compressor is disabled
9. In emergency heat mode the reversing valve remains de-energized
10. High pressure and low DX coil temperature can affect compressor operation
11. The brownout function can affect compressor and electric heat operation
23456789012
AAF-HermanNelson Incorporated
4900 Technology Park Boulevard, Auburn, New York 13021-9030 USA (315) 253-2771
Printed on recycled paper containing at least 10% post-consumer recycled material.
©1999 AAF – McQuay Incorporated
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