York MAXA-MISER VR036A15H User manual

PAGE 1
I - Shipping And Packing List
Package 1 of 2 contains:
1 - Energy Recovery Ventilator Assembly
1 - Outdoor Fresh Air Hood w/ Filter
1 - Outdoor Exhaust Hood w/ Barometric Dampers
1 - Bag Assembly
1 - Roll of ¾"x1¼"gasket
1 - 272" of
18
" x ½" gasket
1 - Field Wiring Harness
1 - Adapter Wiring Harness
10 - #14 Screws
10- #10x1½"Screws
30 - #10 x ½" Gold Screws
1 - Installation Instructions
Package 2 of 2 contains:
1 - Balancing Damper Assembly
1 - Platform Support Plate
2 - Side Filler Panel
2 - Door Panels
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 absence of
local codes, with the current National Electric Code,
ANSI/NFPA No. 70.
V - Application
Unitary Energy Recovery Ventilator (UERV) are used with
15 to 25 ton units equipped with a return damper
assembly. These wheels 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 UERV absorbs 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
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 —- 1500 Lbs. (Crated)
2- Remove crating. Then remove access panel to retrieve
bag assembly. 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.
Energy recovery COMPONENT certified
to the ARI Air-to-Air Energy Recovery
Ventilation Equipment Certification
Program in accordance with ARI
Standard 1060-2000 . Actual performance
in packaged equipment may vary.
ETL Certified per UL 1995
and CSA 22.2
INSTALLATION
INSTRUCTIONS
MAXA-MI$ER™
UNITARY ENERGY RECOVERY VENTILATOR
MODEL VR036A15H/25H & VR046A15H/25H
& VR062A15M/H/25M/H (STATIONARY)
035-19269-000-A-0203
60
57
38
A
30
12
MODEL# A
VR036 46
58
VR046 52
58
VR062 58
78

VII - Installation
1- Disconnect all power to rooftop unit.
2- Remove the rooftop unit horizontal and return air access
panels. Also remove any hoods and/or power exhaust
equipment. Discard hoods, power exhaust equipment
horizontal supply and return air access panels. See
Figure 1.
3- Remove return duct cover in the floor of rooftop unit.
4- Remove 9 screws holding painted outside center post
between horizontal return air openings.
5- Remove clip, two screws on the top and two
38
" head
screws on the bottom to remove inside galvanized
center post. See Figure 2 and 3.
6- Install balancing damper assembly. Reinstall painted
outside center post. See Figure 4 and 5.
7- Adjust balancing damper to minimum air flow
requirements by loosening the set screw and moving
adjustable rod to desired setting. See Figure 6.
8- Locate the provided field wiring harness and plug into
the economizer plug of the rooftop unit. If rooftop unit
has 12 pin plug, the provided adapter will be needed.
Route field harness through balancing damper so
connection can be made to UERV after installation. See
Figure 7.
9- Locate the provided platform support rail. Align the
platform support rail with the base rail of the rooftop unit.
Attach the platform support rail to the upper set of holes
in the balancing damper using the provided #14 screws.
See Figure 8.
10- Locate the two provided door panels. Secure the door
panels to the horizontal return openings using the
provide #10x1½"screws. See Figure 9.
11- Using lifting lugs, raise UERV unit approximately three
(3) feet. Remove nut and bolt assembly to slide
telescoping part of leg out of guide. 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.
12- Apply the provide ¾" x 1 ¼" gasket over the #14 screws
on platform support rail and also down the center post
of the UERV. See Figure 9 and 10.
PAGE 2
MAXA-MI$ER™
UNITARY ENERGY RECOVERY VENTILATOR
MODEL VR036A15H/25H & VR046A15H/25H
& VR062A15M/H/25M/H (STATIONARY)
INSTALLATION
INSTRUCTIONS
Figure 1
Figure 2
Figure 3
REMOVE
REMOVE
FILTER ACCESS
REMOVE

PAGE 3
13- Lift and move UERV unit into position in front of
horizontal exhaust air opening.
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- Remove screws from top panel of rooftop unit. Ensure
top will move up at least 2”.
15- Lower UERV into bottom support plate catching the
front edge of the UERV bottom into the ½" flange. With
the UERV in place, adjust the standoff legs to level and
support UERV against rooftop unit. Tighten securely.
Rotate lifting lug to original position and tighten
machine bolts
16- Place UERV top flange under the rooftop unit top panel
secure the rooftop unit top panel with existing screws.
See Figure 11.
17- Secure the provided side filler panels to the UERV and
to the holes in the door panels installed earlier with the
provide #10 x ½" screws. See Figure 12 and 13.
18- Locate the plug extended from back of UERV through
opening in door panel. Connect this plug to the field
wiring harness installed earlier.
19- Seal, if required, along face (top and sides) of UERV
unit where it meets rooftop unit to insure no air
leakage. Final assembly should resemble Figure 14.
20- 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.
21- Connect line voltage power supply to UERV unit from
disconnect switch. Connect line voltage to fuse block
in control box through knockout on the front of UERV.
See Figure 15.
22- Ground unit with a suitable ground connection either
through unit supply wiring or an earth ground.
NOTE-Unit voltage entries must be sealed weather
tight after wiring is complete.
23- Replace access panel onto the UERV unit and secure.
24- Restore power to unit.
25- Cleanup once unit is operating properly, caulk any
open joints, holes or seams to make the units
completely air and water tight.
26- Leave this instruction manual with owner or in an
envelope to be kept near unit.
MAXA-MI$ER™
UNITARY ENERGY RECOVERY VENTILATOR
MODEL VR036A15H/25H & VR046A15H/25H
& VR062A15M/H/25M/H (STATIONARY)
INSTALLATION
INSTRUCTIONS
Figure 5
Figure 6
Figure 4
ADJUSTMENT ROD
REINSTALL CENTER POST
BALANCING DAMPER

PAGE 4
VIII - Operation
How It Works
The unit contains an Energy Recovery Wheel that is a new
concept in rotary air-to-air heat exchangers. Designed as a
packaged unit for ease of installation and maintenance,
only matching up to 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 media is permanently bonded
with a dry desiccant coating for total enthalpy recovery.
The wheel is belt driven by one motor and drive belt.
When slowly rotating through counter flowing exhaust and
fresh air streams the UERV absorbs 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 between 50-60 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 UERV 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
UERV 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.
During the heating season, when outdoor air temperatures
are below 15oF, it is recommended to use the (optional)
low ambient kit.
Optional 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 UERV 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.
MAXA-MI$ER™
UNITARY ENERGY RECOVERY VENTILATOR
MODEL VR036A15H/25H & VR046A15H/25H
& VR062A15M/H/25M/H (STATIONARY)
INSTALLATION
INSTRUCTIONS
Figure 7
FIELD HARNESS
Figure 8
Figure 9
¾x1¼GASKET
DOOR PANELS
PLATFORM SUPPORT RAIL

PAGE 5
FROST THRESHOLD TEMPERATURE
INDOOR RH AT
70oF
FROST THRESHOLD
TEMPERATURE
20% 0oF
30% 5oF
40% 10oF
Because Unitary 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 UERV operational
hours, exhaust only frost control option is available.
Recovery Wheel Mode
On an Energy Management activation or call for blower
operation in heating, cooling or continuous blower, the
UERV will rotate between fresh air and exhaust air
streams. Both the fresh air and exhaust air blowers will
also be operating to overcome the air resistance of the
UERV.
IX - System Check
1- Disconnect main power.
2- Turn thermostat to “Cont” for blower operation.
3- Restore power to unit. Observe UERV wheel rotation
and both fresh air and exhaust air blowers will
operating.
NOTE: If 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.
4- Verify that the UERV (3) three phase blower motors are
phased sequentially ensuring correct rotation and
operation.
a) Disconnect power.
b) Reverse any two field power leads to
the UERV.
c) Reapply power.
A - Return Damper Settings
Manually adjust position of dampers. This is accomplished
by loosing and tightening set screw on positioning rod.
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 UERV.
To take pressure readings remove plugs in UERV door
MAXA-MI$ER™
UNITARY ENERGY RECOVERY VENTILATOR
MODEL VR036A15H/25H & VR046A15H/25H
& VR062A15M/H/25M/H (STATIONARY)
INSTALLATION
INSTRUCTIONS
Figure 11
Figure 13
UERV TOP FLANGE UNDER RTU TOP
Figure 10
Figure 12
SIDE FILLER PANEL
SIDE FILLER PANEL
¾x1¼GASKET

panels. Intake pressure drop will be read on one side of the
UERV, exhaust on the other side. Refer to blower
performance Tables showing specific air volumes at
various speeds. The table is for balanced air flows (fresh
air and exhaust air are equal), unbalanced airflow will
effect UERV performance.
1- Disconnect main power to unit before making
adjustment to economizer and/or UERV unit.
2- Replace UERV control access cover.
3- Set thermostat to normal operating position.
4- Restore power to unit.
X - Maintenance
1- All motors use prelubricated sealed bearings; no further
lubrication is necessary.
2-Make visual inspection of dampers, linkage assemblies
and UERV 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.
3-Annual inspection of the self cleaning wheel is
recommended. With power disconnected, remove
UERV access panels (rear) and unplug [J150 & P150]
(Refer to wiring diagram in this instruction manual).
Remove media and wash with water and/or mild
detergent. Replace media by reversing the above
procedure.
4-To install wheel segments follow steps A through E . See
Figure 16. 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 90oto 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 6
MAXA-MI$ER™
UNITARY ENERGY RECOVERY VENTILATOR
MODEL VR036A15H/25H & VR046A15H/25H
& VR062A15M/H/25M/H (STATIONARY)
INSTALLATION
INSTRUCTIONS
B
C
A
D
E
D
HUB
SEGMENT
FIGURE 16
SPOKE
SEGMENT RETAINER CATCH
WHEEL RIM
SEGMENT RETAINER
Figure 14
Figure 15
DELTA PRESSURE
(EXHAUST AIR)
FUSE BLOCK

PAGE 7
ENERGY RECOVERY VENTILATOR
SCFM vs. PRESSURE DROP
0.83 0.89 0.95 1.01 1.07
1.55 1.52 1.48
1.41
1.34
1.23 1.18 1.12
1.04
0.92
0.90 0.85
0.75
0.66
0.50
0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80
2800 3000 3200 3400 3600
SCFM
Equation of line: SCFM=(PD + 0.01)/0.0003
TABLE #1
PRESSURE DROP (in. of W.C.)
R36 Series 1000 RPM 900 RPM 800 RPM 700 RPM

PAGE 8
ENERGY RECOVERY VENTILATOR
SCFM vs. PRESSURE DROP
0.52 0.57 0.62 0.67 0.71 0.76 0.81 0.86 0.91 0.96 1.00 1.05 1.10
1.49 1.50 1.50 1.49 1.46 1.44 1.41 1.38 1.35
1.29 1.25
1.18
1.10
1.20 1.20 1.19 1.18 1.16 1.13 1.10
1.03 0.98 0.93
0.85
0.78
0.60
0.91 0.90 0.89 0.88 0.85 0.80 0.75 0.69 0.65
0.57
0.48
0.37
0.22
0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 4200 4400 4600
SCFM
Equation of line: SCFM=(PD + 0.001429)/0.0002393
TABLE #1
PRESSURE DROP (in. of W.C.)
R46 Series 1000 RPM 900 RPM 800 RPM

PAGE 9
ENERGY RECOVERY VENTILATOR
SCFM vs. PRESSURE DROP
0.81 0.84 0.87 0.91 0.94 0.98 1.01 1.04
1.89 1.82 1.75
1.65
1.55
1.44
1.35
1.21
1.45
1.36
1.28
1.17
1.03
0.90
0.77
1.00
0.90
0.80
0.68
0.51
0.36
0.18
0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00
4800 5000 5200 5400 5600 5800 6000 6200
SCFM
Equation of line: SCFM=(PD - 0.0017857)/0.0001679
TABLE #1
PRESSURE DROP (in. of W.C.)
R62 Series 1200 RPM 1100 RPM 1000 RPM

PAGE 10

R62-18YDW
ERS UNIT SCHEMATIC DIAGRAM
PAGE 11
Notes:
1. Remove jumper to install field optional low ambient switch.
2. Step-down transformer assembly for 460 volt units.
3. Selective voltage terminal for proper unit voltage
4. Optional low ambient switch.
5. Optional motorized intake damper.
6. Optional stop, start and jog control.
7. Matching adapter harness (provided) to connect with rooftop unit. For energy
management systems connect +24v to green and common 24v to black.
COMPONENT CODE
A131 Fixed Relay Board
B26 Motor, Exhaust Air
B27 Motor, Fresh Air
B28 Motor, Desiccant Wheel
B30 Motor, Damper (Optional)
C23 Capacitor, Wheel Motor
DL43 Delay, Cycle Timer (Optional)
F29 Fuse
J33 Jack, Cycle Control (Optional)
J34 Jack, Cycle Control Harness (Optional)
J40 Jack, Cycle (Optional)
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 Harness
K94 Relay, On/Off (Optional)
K163 Contactor, Exhaust Air Motor
K164 Contactor, Fresh Air Motor
P33 Plug, Cycle Control (Optional)
P34 Plug, Cycle Control Harness (Optional)
P40 Plug, Wheel Cycle (Optional)
P48 Plug, Fresh Air Motor Harness
P50 Plug, Wheel Motor Harness
P51 Plug, Exhaust Air Motor Harness
P56 Plug, Damper Motor Harness
P148 Plug, Fresh Air Motor
P150 Plug, Wheel Motor
P151 Plug, Exhaust Air Motor
P152 Plug, Transformer (High Voltage)
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)
T27 Transformer, Control
T28 Transformer, Step-down (Optional)
WIRE COLOR
BK Black
BL Blue
GR Green
GY Gray
OR Orange
PK Pink
RD Red
WH White
YL Yellow

Unit#: 01-R62-01XX-23/-33/-43
Desiccant Wheel for Rooftop Unit
208-230/460V/575V (3 PH)
ERS UNIT WIRING DIAGRAM
Notes:
1. Remove jumper to install field optional low ambient switch.
2. Step-down transformer assembly for 460 volt units.
3. Selective voltage terminal for proper unit voltage
4. Optional low ambient switch.
5. Optional motorized intake damper.
6. Optional stop, start and jog control.
7. Matching adapter harness (provided) to connect with rooftop unit. For energy
management systems connect +24v to green and common 24v to black.
Subject to change without notice. Printed in U.S.A.
Copyright ãby Unitary Products Group 2003. All Rights Reserved. 035-19269-000-A-0203
Unitary
Products
Group
5005
York
Drive
Norman,
Oklahoma
73069
Supersedes: Nothing