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INSTALLATION
INSTRUCTIONS
The board will spin the wheel intermittently in 10 min off 1
min on intervals to keep dust from building up on the
surface.
All units shipped with the Start, Stop, Jog option installed
have the temperature and enthalpy sensors installed, and
the jumper (J9) set to T(emp). A qualified tech can adjust
the setting to E(nthalpy) only or Temp and Enthalpy by
adjusting the jumper (J9).
The factory set points to allow for free cooling during
o
o
ventilation are 40
F-70
F, but they can be field adjusted to
narrow the band by adjusting two potentiometers while
measuring VDC between the Com & High or Com & Low
terminals (0 VDC = 40 degrees, low set point, 5 VDC = 70
degrees, high set point).
IX - Sys tem Check
1. Disconnect main power.
2. Remove control access panel and apply 24 volts to low
voltage terminal strip at "TB37-1(+) and TB37-2(-)".
3. Restore power to unit. Observe UERV wheel rotation
and both fresh air and exhaust air blower are
operating.
A - Re turn Damper Set tings
Manually adjust position of dampers. This is accomplished
by loosing and tightening the wingnut on quadrant opening
the return dampers.
B - Blower Speed Ad just ment
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.
See Figure 10 for location to take pressure readings.
C - Air Bal anc ing Ad just ment
1. Remove plastic plugs in door panels (4 total).
2. With a manometer measure the pressure drop [Inches
Of water column] across the wheel on the supply
airflow side of the unit (Top). The unit's CFM is
determined by referring to Table #1. If the Cfm value is
not per design adjust the motor sheave until the
desired CFM is reached.
3. To adjust the exhaust airflow check the pressure on
the exhaust side of the unit (Bottom), then remove the
door panel to access the return air dampers installed
inside the RTUs return air section. Adjustment of the
damper is made by loosening the wingnut, adjusting
the damper blades and then tightening the wingnut
before closing the panel and measuring again.
4. Once desired the CFM is reached replace the plastic
plugs in the access holes in the doors.
X - Main te nance
Motor Maintenance
All motors use prelubricated sealed bearings; no further
lubrication is necessary.
MAXA-MI$ER
UNITARY ENERGY RECOVERY VENTILATOR
MODEL VR011A12H & B12H (STATIONARY)
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.
Energy Wheel Maintenance
Four pie-shaped ERW segments are seated on stops
between the stainless steel spring retainers, secured to
the hub and rim of wheel. Annual inspection of the self
c l e a n i n g w h e e l i s r e c o m m e n d e d . W i t h p o w e r
disconnected, remove UERV access panels (rear) and
unplug (J150 & P150). Refer to wiring diagram in this
instruction manual. Each segment is secured in place by a
stainless steel spring retainer located on wheel rim.
Remove one end of the stainless steel spring retainer from
the slot in the wheel rim and remove. Do the same on the
next retainer. Remove segment and wash with water
and/or mild detergent. Replace segment by reversing the
above procedure. See Figure 12. Discoloration and
staining of UERV 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. Thoroughly spray plastic surface with
household cleaner such as Fantastic
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.
WHEEL RIM
SPOKE
PAGE 5
5257541-UAI-A-0616 / R11A-29YSDW
or equivalent
SEGMENT RETAINER CATCH
SEGMENT
HUB
SEGMENT RETAINER
Figure 12
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