Ruskin RRS Rooftop Systems P28 Series User manual

I - SHIPPING AND PACKING LIST
Package 1 of 1 contains:
1 - Energy Recovery Wheel Assembly
1 - Outdoor Fresh Air Hood with Filter
1 - Outdoor Exhaust Hood with Barometric Damper
1 - Platform Support Rail
2 - Side Filler Panels
1 - Top Filler Panel
1 - Box Assembly
a) Gasketing.
b) Wiring harness
c) Hardware for attachment to economizer.
II - SHIPPING DAMAGE
Check unit for shipping damage. Receiving party should
contact last carrier immediately if shipping damage is
found.
III - GENERAL
These instructions are intended as a general guide and do
not supersede local codes in any way. Authorities having
jurisdiction should be consulted before installation.
IV - REQUIREMENTS
When installed, the unit must be electrically wired and
grounded in accordance with local codes or, in the
absence of local codes, with the current National Electric
Code, ANSI/NFPA No. 70.
V - APPLICATION
Energy Recovery Ventilators (ERV) are used with 15 to 20
ton rooftop units. These wheels conserve energy by mixing
warmer air with cooler air in the following manner:
Recovery Ventilator Mode
The Recovery Ventilator mode is accomplished by two
blowers providing continuous exhaust of stale indoor air
and replacement by equal amount of outdoor air. Energy
recovery is achieved by slowly rotating the energy
recovery wheel within the cassette frame work. In winter,
the wheel adsorbs heat and moisture from the exhaust air
stream during one half of a complete rotation and gives
them back to the cold, drier intake air supply during the
other half rotation. In summer, the process is automatically
INSTALLATION INSTRUCTIONS
ENERGY RECOVERY VENTILATOR
P28A-10TDW
MAY 11, 2005
PAGE 1
Patent# 5,548,970
INSTALLATION INSTRUCTIONS FOR ENERGY RECOVERY VENTILATOR (PIVOTING)
USED WITH TRANE ROOFTOP UNIT MODELS YCD/TCD 15 TO 20 TON UNITS
reversed. Heat and moisture are absorbed from incoming
fresh air supply and transferred to the exhaust air stream.
This process allows outdoor air ventilation rates to be
increased by factors of three or more without additional
energy penalty or increase in size of heating or air
conditioning systems.
VI - RIGGING UNIT FOR LIFTING
1. Maximum weight of unit is —- 900 Lbs (crated).
2. Remove crating. Then remove access panel to
retrieve box assembly. See Figure 1. Replace access
panel.
3. All panels must be in place for rigging.
4. Lifting lugs are supplied with the unit. Loosen machine
bolts and rotate lifting lug as shown in Figure 1.
VII - INSTALLATION
Note: The ERV unit is equipped with a support block
that must be removed to allow the unit to change
operating modes. This block may cause damage
to system if not removed.
ACCESS PANEL
LIFTING LUGS (4)
Figure 1
ETL Certified per UL 1995
and CSA 22.2
Energy recovery COMPONENT
certified to the AHRI Air-to-Air
Energy Recovery Ventilation
Equipment Certification Program in
accordance with AHRI Standard
1060-2000. Actual performance in
packaged equipment may vary.

PAGE 2
CAM
BOLT
BOLT
NUT
END SWITCH BRACKET
Figure 2
Figure 3
TELESCOPING LEG
FOOT PAD
MICROSWITCH
WASHER
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
CAUTION
Danger of sharp metallic edges. Can cause injury.
Take care when servicing unit to avoid accidental
contact with sharp edges.
1. Disconnect all power to rooftop unit.
2. Remove the rooftop return air access panels. Also
remove any hoods and/or power exhaust equipment.
Discard hoods, power exhaust equipment, and return
air access panels.
3. Verify and/or install an economizer. The ERV will
ONLY work with RSI economizers:
4. Remove the enthalpy control sensor from the
economizer. Keep enthalpy control sensor. It will be
reinstalled in the ERV.
5. Locate the provided end switch, cam screw, washer,
bolts, nuts and bracket in box assembly.
6. Install the cam on the economizer exposed blade pivot
with shoulder pointing outward by attaching with
provide 10-32 x 1" screw and rubber washer. Position
cam and screw, but do not completely tighten screw.
Next attach switch bracket to economizer end plate
using provided ½" self-tapping screws. Then mount
switch to bracket using the oblong holes with provided
6-32 x 1" bolts and nuts. See Figure 2. This cam will
trip the end switch S122 when damper rotates. Set the
end switch arm so that it closes when fresh air
dampers are open 50% or greater. Tighten screw to
secure cam.
7. Locate the provided low voltage field harness. Wire
the field harness to the economizer controls per the
field wiring harness diagram provided in this
installation instructions. Remove the wires that were
connecting the enthalpy control of the economizer and
replace them with purple and blue wires on the field
wiring harness.
8. Clean up wiring around the economizer and neatly
route the wires to clear any moving parts.
9. Route the excess wire of the field wiring harness out
the return air. Coil the excess wire inside the rooftop
unit to clear installation of the ERV.
10. Install side fillter panel to RTU. Secure into place with
provided screws.
11. Attached platform support rail centered on rooftop unit
base rail with channel pointing upward.
12. Locate roll of provided ¾" and 18" gasket material.
Apply ¾" gasket to the middle and bottom decks of the
ERV. Also apply 18" gasket to perimeter of ERV that
contacts RTU.
13. Using lifting lugs, raise ERV unit approximately three
(3) feet. Remove nut and bolt assembly to slide
telescoping part of leg half way out of guide and attach
flat foot with hardware provided in bag assembly.
Position standoff legs so that flat foot is on bottom of
stand and reinstall nut and bolt assembly. DO NOT
fasten tightly, adjustment will need to be made when
unit is put into position. See Figure 3.
14. Lift and move ERV unit into position with open end
in-line with back door panel horizontal openings.
Note: A treated 2" x 6" x 48" piece of wood or
equivalent equipment support should be used to
under feet of standoff legs to prevent roof
penetration.
15. Lower ERV into platform support rail catching the front
edge of the ERV bottom into the flange. With the ERV
in place, adjust the standoff legs to level and support
ERV against rooftop unit side filler panels. Use screws
to securely fasten ERV to rooftop unit. Tighten
securely. Rotate lifting lug to original position and
tighten machine bolts.

16. Insert and secure top filler panel under top flange of
rooftop unit and against top flange of ERV.
17. Seal, if required, along face (top and sides) of ERV unit
where it meets rooftop unit to insure no air leakage.
18. Locate the enthalpy control sensor removed earlier
from the rooftop unit. Remove the connectors and
wires from its terminals.
19. Remove the screws to the top panel of the fresh air
hood on the ERV labeled "filter access". Push up the
top panel and remove the air filter. Reinstall the
enthalpy control sensor with self-tapping screws on
the right side panel of the fresh air intake hood.
20. Remove the ERV access panels. Locate the bundle of
wires on the top deck. Route the blue and purple wires
to the enthalpy control sensor. Connect the purple wire
to the "+" terminal on the enthalpy control and the blue
wire to the "S" terminal. See field wiring diagram.
21. Remove ERV support block to allow wheel rotation
when unit is placed in operation.
22. All electrical connections must conform to any local
codes and current National Electric Codes (NEC) and
Canadian Electric Codes (CEC). Refer closely to unit
wiring diagram in unit and/or in these instructions for
proper wiring connections. Refer to the unit nameplate
for minimum circuit ampacity and maximum
overcurrent protection size. Electrical data is listed on
unit rating plate and motor nameplates.
23. Connect line voltage power to ERV from rooftop unit
disconnect switch through the knock out. Connect the
line voltage to the ERV control box per the wiring
diagram.
24. Ground unit with a suitable ground connection either
through unit supply wiring or earth ground.
Note: Unit voltage entries must be sealed weather
tight after wiring is complete.
25. Replace access panels onto the ERV unit and secure.
26. Restore power to unit.
27. Balancing is done by removing the plastic plugs in
door panels (4 total).
28. With a manometer measure pressure drop [ inches of
water column] across the top half of ERV (top holes in
door panel). Unit CFM is determined by referring to
Table #1. If CFM values are not per design, adjust
internal damper setting inside rooftop unit. This
accomplished by loosing set screw on damper frame
of positioning rod or slide damper. The repeat
measurement method.
29. Place plastic plugs back into door panels
30. Cleanup once ERV is operating properly. Caulk any
open joints, holes or seams to make the unit
completely air and water tight.
31. Leave this instruction manual with owner or in an
envelope to be kept near the unit.
PAGE 3
VIII - OPERATION
How It Works
The unit contains an Energy Recovery Wheel (ERW) that
is a new concept in rotary air-to-air heat exchanger.
Designed as a packaged unit for ease of installation and
maintenance, only matching up to rooftop unit with an
internal economizer and connection of electrical power is
required to make the system operational. The concept
consists of a unique rotary energy recovery wheel that
rotates in and out of fresh air streams within a heavy duty,
permanently installed blower cabinet that provides ready
access to all internal components. The media is polymeric
material that is coated and permanently bonded with a dry
desiccant for total enthalpy recovery. The wheel is belt
driven by PSC motor and drive belt.
When slowly rotating through counter flowing exhaust and
fresh air streams the ERV adsorbs sensible heat and latent
heat from the warmer air stream and transfer this total
energy to the cooler air stream during the second half of its
rotating cycle. Rotating at 60 revolutions per minute, the
wheel provides constant flow of energy from warmer to
cooler air stream. The large energy transfer surface and
laminar flow through the wheel causes this constant flow
of recovered energy to represent up to 85% of the
difference in total energy contained within the two air
streams.
Sensible and latent heat are the two components of total
heat. Sensible heat is energy contained in dry air and latent
heat is the energy contained within the moisture of the air.
The latent heat load from the outdoor fresh air on an air
conditioning system can often be two to three times that of
the sensible heat load and in the winter it is a significant
part of a humidification heat load.
During both the summer and winter, the ERV transfers
moisture entirely in the vapor phase. This eliminates wet
surfaces that retain dust and promote fungal growth as well
as the need for a condensate pan and drain to carry water.
Because it is constantly rotating when in the air stream, the
ERV is always being cleared by air, first in one direction
then the other. Because it is always dry, dust or other
particles impinging on the surface during one half cycle,
are readily removed during the next half cycle.
Low Ambient Kit is appropriate for climates with limited
HVAC system operation when outdoor temperatures are
below 15oF.
The frost threshold is the outdoor temperature at which
frost will begin to form on the ERV wheel. For energy
recovery ventilators, the frost threshold is typically below
15oF. Frost threshold is dependent on indoor temperature
and humidity. The table shows how the frost threshold
temperatures vary depending on indoor conditions.
FROST THRESHOLD TEMPERATURE
INDOOR RH AT
70oF
FROST THRESHOLD
TEMPERATURE
20% 0oF
30% 5oF
40% 10oF
Because Energy Recovery Ventilators have a low frost
threshold, frost control options are not necessary in many
climates. Where outdoor temperatures may drop below
the frost threshold during the ERV operational hours,
exhaust only frost control option is available.

Low Ambient Kit
Low Ambient Kit turns off the supply blower when outdoor
temperatures fall below the frost threshold. Exhaust Only
set points are field adjustable with a factory supplied
thermostat. Supply fan operation is automatically restored
when the exhaust air temperature rises above the
thermostat set point. Provisions for introducing make-up
air into the building when the supply blower is off to avoid
depressurization should be considered.
Recovery Wheel Mode
On a thermostat call for blower operation in heating,
cooling or continuous blower, the ERV media will rotate
between fresh air and exhaust air streams. Both the fresh
air blower and exhaust air blower will be operating to
overcome the air resistance of the ERV media. The ERV
unit will operate in this mode until economizer mode is
activated.
Economizer/Power Exhaust Mode
On the activation of the economizer mode [closure of
damper switch], the ERV unit will shutdown for
approximately 60 seconds to allow the ERV media to pivot
out of the air stream. After the delay timer has been
satisfied, the exhaust air blower will operate. The ERV unit
will act as a power exhaust unit.
This mode will continue until economizer has been
deactivated. The exhaust air blower will shut down and the
delay timer will be activated. During this time period the
ERV media will pivot back into the air stream. When timing
is complete the unit will operate in the Recovery Wheel
Mode.
IX - SYSTEM CHECK
1. Disconnect ERV main power.
2. Remove ERV control access panel and install jumper
at low voltage terminal strip between "TB37-1 and
TB37-2". Wheel should pivot out of air stream.
Note - If optional Low ambient kit is used the jumper
between TB37-5 & TB37-6 should be removed.
Also if system check out is being conducted at low
ambient temperatures, technician should be
aware that this kit can cause system not to
operate.
3. Turn thermostat to "Cont" for blower operation.
4. Restore power to unit. Observe ERV drive motors
(damper motor) for wheel and dampers, it should pivot
wheel out of air stream, opening fresh air dampers and
a delayed exhaust blower will operate.
5. Remove jumper(s) from low voltage terminal block
(TB37). View pivoting of media back into air stream
and closing of fresh air dampers. After delay timer has
cycled then both fresh air blower and one exhaust air
blower will operate.
6. Disconnect main power to unit before making
adjustment to economizer and/or ERV unit.
7. Replace ERV control access panel.
8. Set thermostat to normal operating position.
9. Restore power to unit.
PAGE 4
A - Economizer Settings
Refer to economizer instructions for minimum air flow
requirement. The damper end switch setting on the
internal economizer damper assembly is field adjustable to
any position above minimum air flow for fresh air
requirements at the customers specified conditions.
B - Blower Speed Adjustment
Blower speed selection is accomplished by changing the
sheave setting on both fresh air and exhaust air blowers.
Both blowers are factory set at "closed" for maximum
airflow. To determine air flow setting, external static
pressure readings will need to be read across the ERV.
See Figure 4 for location to take pressure readings.
1. Disconnect main power to unit before making
adjustment to economizer and/or ERV unit.
2. Replace ERV control access cover.
3. Set thermostat to normal operating position.
4. Restore power to unit.
Figure 4
C - Air Balancing Adjustment
1. Remove plastic plugs in door panels (4 total).
2. With a manometer measure pressure drop [inches of
water column] across top half of ERV (top holes in door
panel). Unit CFM is determined then by referring to
Table #1. If CFM values are not per design, adjust
damper in fresh air hood and repeat measure method.
3. Repeat the same process for the bottom half of ERV. If
CFM values are not per design, adjust internal
dampers inside the ERV . This is accomplished by
removing door panel at the return air opening, loosing
screw in center of damper, then slide damper rod up or
down in the return airstream and re-tighten screw.
Replace door panel and repeat measurement method.
4. Place plastic plugs back in to door panels.

X- MAINTENANCE
Motor Maintenance
All motors use prelubricated sealed bearings; no further
lubrication is necessary.
Mechanical Inspection
Make visual inspection of dampers, linkage assemblies
and ERV rotating bearings during routine maintenance.
Filters should be checked periodically and cleaned when
necessary. Filter is located in fresh air hoods. DO NOT
replace permanent filters with throwaway type filters.
Belt Alignment
Proper alignment is essential to maintain long V-Belt life.
Belt alignment should be checked every time belt
maintenance is performed, each time the belt is replaced,
and whenever sheaves are removed or installed.
Belt Installation
Always move the drive unit forward so the belt can be
easily slipped into the groove without forcing them. Never
force the belt into a sheave with a screw driver or wedge.
You will damage the fabric and break the cords. It is
recommended that the pulley center distances be offset by
¾" for proper length. This will allow the motor assembly to
slide forward to remove belt and backward for belt tension.
Belt Tension
Measure the span length (center distance between pulleys
when belt is snug). Mark center of span, then apply a force
(6 to 9 Lbs on new belts) perpendicular to the span large
enough to deflect the belt 164" for every inch in span length.
Energy Recovery Wheel Maintenance
Eight pie-shaped ERW segments, are seated on stops
between the segment retainer which pivots on the wheel
rim and secured to the hub and rim of wheel. Annual
inspection of the self cleaning wheel is recommended.
With power disconnected, remove ERV access panels
(rear) and unplug [J150 and P150] (Refer to wiring
diagrams in this instruction manual). Remove segment
and wash with water and/or mild detergent.
To install wheel segments follow steps A through E . See
Figure 5. Reverse procedure for segment removal.
A. Unlock two segment retainers (one on each side of the
selected segment opening.
B. With the embedded stiffener facing the motor side,
insert the nose of the segment between the hub plates.
C. Holding segment by the two outer corners, press the
segment towards the center of the wheel and inwards
against the spoke flanges. If hand pressure does not
fully seat the segment, insert the flat tip of a screw
driver between the wheel rim and outer corners of the
segment and apply downward force while guiding the
segment into place.
D. Close and latch each segment retainer under segment
retaining catch.
E. Slowly rotate the wheel 180o. Install the second
segment opposite the first for counterbalance. Rotate
the two installed segment 90o to balance the wheel
while the third segment is installed. Rotate the wheel
180oagain to install the fourth segment. Repeat this
sequence with the remaining four segments.
PAGE 5
B
C
A
D
E
D
HUB
SEGMENT
SPOKE
SEGMENT RETAINER CATCH
WHEEL RIM
SEGMENT RETAINER
Figure 5
XI - WARRANTY
RSI Manufactured Parts
In the event that defects in workmanship or materials
originate in any part manufactured by RSI, FOB point of
manufactured, we guarantee to repair or replace that part,
within three (3) months of the shipment date.
Other Supplied Parts
Additionally, RSI guarantees to replace standard
components purchased new from a RSI vendor, (motors,
controls, etc.) that may be found defective, within twelve
(12) months of the installation date. The components
warranty, however, excludes service call charges and
labor cost for replacing or adjusting the defective part.
Limitation of Warranties
Misapplication, destruction, negligence or alteration
constitute the warranty and/or the components warranty of
RSI products and/or parts, null and void. This warranty is
provided in lieu of all other written, stated or implied
warranties.

PAGE 6
ENERGY RECOVERY VENTILATOR
SCFM vs. PRESSURE DROP
0.53 0.57 0.60 0.64
0.71
0.78
0.85
0.93
1.00
1.30 1.31 1.31 1.30 1.28 1.26
1.20
1.13
1.04
1.09 1.09 1.09 1.08 1.05
0.99
0.90
0.82
0.75
0.89 0.88 0.87 0.85 0.81
0.75
0.66
0.59
0.5
0.69 0.68 0.65 0.62 0.57
0.5
0.42
0.35
0.25
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
1500 1600 1700 1800 2000 2200 2400 2600 2800
SCFM
Equation of line: SCFM=(PD + 0.01)/0.00036
TABLE #1
PRESSUREDROP(in.ofW.C.)
P28 Series 1100 RPM 1000 RPM 900 RPM 800 RPM

Notes:
1. Remove jumper to install field optional low ambient switch.
2. Step-down transformer assembly for 460/575 volt units (only) connect between J50 and P50.
3. Move wire for different input voltage
4. Optional low ambient switch.
5. Optional motorized intake damper.
6. Reposition enthalpy control into intake hood of ERV from rooftop unit economizer.
PAGE 7
P28A-10TDW
COMPONENT CODE
A130 Pivot Wheel Board
B26 Motor, Exhaust Air
B27 Motor, Fresh Air
B28 Desiccant Wheel
B29 Motor, Wheel & Damper
B30 Motor, Damper (Optional)
C23 Capacitor, Wheel Motor
F29 Fuse
J48 Jack, Control Box (Fresh Air)
J50 Jack, Control Box (Wheel)
J51 Jack, Control Box (Exhaust Air)
J56 Jack, Control Box (Damper)
J148 Jack, Fresh Air Motor Harness
J150 Jack, Wheel Motor Harness
J151 Jack, Exhaust Air Motor Harness
J152 Jack, Transformer (High Voltage)
J153 Jack, Field Harness
J160 Jack, Damper Motor
J193 Jack, Enthalpy Sensor
K163 Contactor, Exhaust Air Motor
K164 Contactor, Fresh Air Motor
P48 Plug, Fresh Air Motor Harness
P50 Plug, Wheel Motor Harness
P51 Plug, Exhaust Air Motor Harness
P56 Plug, Damper Motor Harness
P104 Plug, Outdoor Enthalpy Sensor
P148 Plug, Fresh Air Motor
P149 Plug, Wheel & Damper Motor
P150 Plug, Wheel Motor
P151 Plug, Exhaust Air Motor
P152 Plug, Transformer (High Voltage)
P153 Plug, Field Harness
P160 Plug, Damper Motor
S26 Switch, Low Ambient (Optional)
S51 Switch, Door
S110 Switch, Tip
T27 Transformer Control
T28 Transformer, Step-down
(Optional)
TB37 Terminal Block (Low Voltage)
WIRE COLOR CODE
BK Black
BL Blue
GR Green
GY Gray
OR Orange
PK Pink
RD Red
WH White
YL Yellow
ERV UNIT SCHEMATIC DIAGRAM

PAGE 8
Unit#: 01-P28-01XX-23/-33/-43
Desiccant Wheel for Rooftop Unit
208-230/460V/575V (3 PH)
ERV UNIT WIRING DIAGRAM
Notes:
1. Remove jumper to install field optional low ambient switch.
2. Step-down transformer assembly for 460/575 volt units (only) connect between J50 and P50.
3. Move wire for different input voltage.
4. Optional low ambient switch.
5. Optional motorized intake damper.
6. Reposition enthalpy control into intake hood of ERV from rooftop unit.

PAGE 9

PAGE 10
PLATFORM SUPPORT RAIL
TOP FILLER PANEL
SIDE FILLER PANEL