Ruskin RRS ROOFTOP User manual

INSTALLATION INSTRUCTIONS
ENERGY RECOVERY WHEEL
INSTALLATION INSTRUCTIONS FOR ENERGY RECOVERY WHEEL (Fixed) USED WITH
ROOFTOP UNITS MODELS 2 TO 5 TON UNITS
I - Shipping And Packing List
Package 1 of 1 contains:
1 - Energy Recovery Wheel Assembly
1 - Bag Assembly of Mounting Screws
1 - Low Voltage wiring Harness
1 - Gasketing (160" of 18" and 24" of 1 18")
1 - Group of Wrapped Assemblies
1 - Rooftop Unit Adapter Panel w/ Platform Support
Rail
1 - Filler Panels
1 - Return Air Balancing Damper Assembly
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 rooftop
units. These ventilators conserve energy by mixing
warmer air with cooler air in the following manner:
Recovery Wheel Mode
The Recovery Wheel 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 ERV 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
reversed. Heat and moisture are absorbed from incoming
intake 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.
R06A-45CDW
JUNE 28, 2006
SUPERCEDES 05-04-04
PAGE 1
VI - Rigging Unit For Lifting
1. Maximum weight of unit is — 198 Lbs. [Carton].
2. Remove carton. Internal box has accessory inside.
3. All panels must be in place for rigging.
CAUTION
Danger of sharp metallic edges. Can cause injury.
Take care when servicing unit to avoid accidental
contact with sharp edges.
VII - Installation
1. Remove and discard the rooftop unit horizontal return
air access panels, hoods and/or power exhaust
equipment.
2. Remove carton from ERV and remove individual
wrapped assemblies.
3. At the rooftop unit remove filter access panel and door
below it (discard).
4. Then insert balancing damper over bottom return air
opening.
5. Attach adapter panel over balancing damper panel
with removed screws. Verify platform support rail is
attached to adapter panel.
6. At the ERV, remove screws from side of adjustable leg
supports. Then slide telescoping part of leg out of
guide from the top. Tip ERV unit forward reinserting
into bottom of guide having attached flat foot under
unit.
7. Place screws back into side of adjustable leg supports,
adjustment will need to be made later when unit is put
into position.
8. Position with ERV open face pointed toward adapter
panel.
9. Attach provided gasketing material (1 18") to seal ERV
divider deck to adapter panel.
10. Attach provided gasketing material (18") to face
(perimeter) of ERV unit to prevent air leakage.
11. Pick up the ERV unit and lower onto platform support
rail aligning hole in the front edge of ¾" flange with
holes in adapter panel.
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
28. Replace access panels onto the ERV unit and secure.
29. Close access panel on the rooftop unit and secure.
30. Restore power to rooftop unit.
31. Start system up to verify operation.
32. Cleanup once ERV is operating properly. Caulk any
open joints, holes or seams to make the units
completely air and water tight.
33. Leave this instruction manual with owner or in an
envelope to be kept near the unit.
VIII - Operation
How It Works
The unit contains an Energy Recovery Ventilator that is a
new concept in a rotary air-to-air heat exchanger.
Designed as a packaged unit for ease of installation and
maintenance, only matching up to a rooftop unit with an
internal balancing damper 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 Energy
Recovery Wheel is 19" in diameter and 2" thick containing
spirally wound polymeric material that is coated and
permanently bonded with a silica gel desiccant for transfer
of sensible and latent heat. The wheel is belt driven by one
0.6 FLA PSC motor and stretch urethane perimeter drive
belt.
When slowly rotating through counter flowing exhaust and
intake air streams the ERV adsorbs sensible heat and
latent heat from the warmer air stream and transfers this
total energy to the cooler air stream during the second half
of its rotating cycle. Rotating at 74.3 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.
In the heating season, when outdoor air temperatures are
below 0 degrees Fahrenheit, it is recommended to use the
(optional) low ambient kit (field installed). At these
conditions you will need to determine the frost threshold
parameters.
12. Elevate the back end of ERV and fasten ERV to
adapter plate with provided screws along both flanges.
13. After adapter panel is secured in place, lower legs to
level unit and locked into place by resetting screws into
adjustable hole locations.
Note: A treated 2" x 6" x 60" piece of wood or
equivalent should be used under feet of
standoff legs to prevent roof penetration.
14. Install filler panel by inserting filler panel under lip of
rooftop unit and attach with screws.
15. Remove rooftop unit return air side access panel.
16. Take balancing damper assembly from removed
assemblies and insert over return duct. With assembly
laying flat over bottom duct opening and having hinge
side pointing toward horizontal duct opening, pivot
until hinge connector is in line with metal deck of ERV
at horizontal duct opening.
17. Route field wire harness (provided) from horizontal
return air duct under balancing damper to rooftop unit
economizer plug (PL-1).
Note: Complete low voltage field wiring as shown on
page 7.
18. Replace filters.
19. Seal, if required, along face (top and sides) of ERV unit
where it meets rooftop unit to ensure no air leakage.
20. All electrical connections must conform to any local
codes and the current National Electric Codes (NEC)
and Canadian Electric Code (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.
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.
WARNING
21. Run high voltage conduit from safety switch (field
provided) to knockout in corner panel.
Note: Unit voltage entries must be sealed weather
tight after wiring is complete.
22. Then run wires from switch to control box through
conduit.
23. Open control box on ERV and identify high voltage
terminal blocks or pigtails.
24. Connect line voltage wiring to the right side terminal
strip or pigtails inside control box as shown in wiring
diagram from safety switch.
25. Ground unit with a suitable ground connection either
through unit supply wiring or an earth ground.
26. Close control box in ERV and turn power switch to “on”
position at control relay circuit board.

PAGE 3
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
10oF. 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. The Exhaust
Only set points are field adjustable with a factory supplied
thermostat. Intake 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 intake 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 intake air and exhaust air streams. Both the
intake air blower and exhaust air blowers will also be
operating to overcome the air resistance of the ERV
media. The ERV unit will operate in this mode until
economizer mode is activated.
IX - System Check
1. Disconnect ERV main power by moving “power”
rocker switch to off position on control relay circuit
board.
2. Remove control access panel and apply 24 volts to low
voltage terminal strip at “G” (+24 vac) and “C”
(common).
3. Restore power to unit. Observe ERV drive motor for
wheel and both blowers are running.
4. Verify that the ERV blower motors are set to “high”
speed for correct speed and operation.
A - Blower Speed Adjustment
Blower speed selection is accomplished by changing the
speed selection switch on control relay circuit board in
control box. Both fresh air and exhaust air blowers are
direct drive multi-tap motors. Both blowers are factory set
at “high” speed for maximum airflow. To determine air flow
setting, external static pressure readings will need to be
read across the ERV.
B - Air Balancing Adjustment
1. Remove plastic plugs in support 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 refer to Table
#1. If CFM values are not per design, adjust damper in
fresh air duct and repeat measure method.
3. Repeat the same process for the bottom half of ERV. If
CFM values are not per design, adjust internal slide
damper inside the ERV. This is accomplished by
removing door panel at the return air opening,
loosening (2) screws in center of damper, then slide
damper up or down in the return airstream and
retighten screws. Replace door panel and repeat
measurement method. Some applications may
require addition adjustment to get lower CFM. A
barometric adjustment stop can be used to add
restriction to exhaust blower
4. Place plastic plugs back in to support panels.
X - Maintenance
—All motors use prelubricated sealed bearings; no
further lubrication is necessary.
—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 front of ERV unit
and before blower cabinet.
—ERV segment, is positioned on a shaft extended from
middle support bar. A galvalum steel disc secures to
the shaft with a Phillips head screw holding the ERV in
place and protecting the ball bearing assembly.
Annual inspection of the self cleaning wheel is
recommended. With power disconnected, remove
ERV access panels (rear and center) and unplug
[J150 & P150] (Refer to wiring diagram in this
instruction manual). Then remove wheel cassette
from cabinet by sliding assembly out of support tracks
in center of unit. Discoloration and staining of ERV
segment does not affect its performance. Only
excessive buildup of foreign material need be
removed. If the segment appears excessively dirty, it
should be cleaned to ensure maximum operating
efficiency. To clean the wheel remove belts, screw
from center hub, grasp segment by rim and remove.
thoroughly spray plastic surface with household
cleaner such as Fantastic® or equivalent or middle
detergent and gently rinse with warm water using a
soft brush to remove heavier accumulation. Shake
excess water from segment and replace in reverse of
removal instructions.
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 4
ENERGY RECOVERY VENTILATOR
SCFM vs. PRESSURE DROP
0.36
0.42
0.48
0.54
0.60
0.66
0.87
0.80
0.73
0.66
0.77
0.67
0.55
0.4
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
300 350 400 450 500 550
SCFM
Equation of line: SCFM=(PD)/0.0012
TABLE #1
PRESSUREDROP(in.ofW.C.)
R06 Series Blow Hi Blow Lo

Notes:
1. Remove jumper to install field optional low ambient switch.
2. Step-down transformer assembly for 208-230/460/575 volt units.
3. Matching adapter harness (provided) to connect with rooftop unit. For energy
management systems connect +24v to green and common 24v to black.
4. Optional low ambient switch.
5. Optional motorized intake damper.
6. Optional stop, start and jog control.
PAGE 5
R06A-45CDW
COMPONENT CODE
A134 Fixed Relay Board
B26 Motor, Exhaust Air
B27 Motor, Fresh Air
B28 Motor, Desiccant Wheel
B30 Motor, Damper (Optional)
C23 Capacitor, Wheel Motor
C25 Capacitor, Motor Exhaust Air
C26 Capacitor, Motor Fresh Air
DL43 Delay, Cycle Timer (Optional)
F1 Fuse
J33 Jack, Cycle Control (Optional)
J34 Jack, Cycle Control Harness (Optional)
J40 Jack - Wheel Cycle (Optional)
J92 Jack - Transformer
J96 Jack - Power Interface
J148 Jack, Fresh Air Motor Harness
J150 Jack, Wheel Motor Harness
J151 Jack, Exhaust Air Motor Harness
J153 Jack, Field Harness
J160 Jack, Damper Motor
K94 Relay - On/Off (Optional)
P1 Plug, P.C. Board (Damper Motor)
P2 Plug, P.C. Board (Wheel)
P3 Plug, P.C. Board (Exhaust)
P4 Plug, P.C. Board (Fresh)
P33 Plug, Cycle Control (Optional)
P34 Plug, Cycle Control Harness (Optional)
P40 Plug, Wheel Cycle (Optional)
P92 Plug, Transformer
P96 Plug, Power Interface
P148 Plug, Fresh Air Motor
P150 Plug, Wheel Motor
P151 Plug, Exhaust Air Motor
P153 Plug, Field Harness
P160 Plug, Damper Motor
S23 Thermostat, Low Ambient (Optional)
S26 Switch, Low Ambient (Optional)
S51 Switch, Door
S125 Switch, Ambient Override (Optional)
SW1 Switch, Power
SW2 Switch, Speed Change (Exhaust)
SW3 Switch, Speed Change (Fresh)
T27 Transformer, Step-down (Optional)
TB1 Terminal Block (Low Voltage)
TB2 Terminal Block (High Voltage)
TB3 Terminal Block (Low Ambient)
WIRE COLOR CODE
BK Black
BL Blue
GR Green
OR Orange
RD Red
WH White
YL Yellow
ERV UNIT SCHEMATIC DIAGRAM