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PAGE 5

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
ventilation are 40

o

F-70

o

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

Ô

UNITARY ENERGY RECOVERY VENTILATOR

MODEL VR011A12H & B12H (STATIONARY) 

 INSTALLATION

INSTRUCTIONS

5257541-UAI-A-0616 / R11A-29YSDW

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

â

 or equivalent

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.

HUB

SEGMENT

SPOKE

SEGMENT RETAINER CATCH

WHEEL RIM

SEGMENT RETAINER

Figure 12

Summary of Contents for VR011A12H

Page 1: ...37 Lbs Crated 2 Remove crating and retrieve bag assembly that is inside of UERV 3 All panels must be in place for rigging 4 Lifting straps are needed to lift the unit CAUTION Danger of sharp metallic edges Can cause injury Take care when servicing unit to avoid accidental contact with sharp edges WARNING Electric shock hazard Can cause injury or death Before attempting to perform any service or ma...

Page 2: ...he installation of the UERV 10 Locate provided rolls of and 1 8 gasket material Apply gasket to the middle and bottom decks or the UERV apply the 1 8 gasket to the perimeter of the transition assembly that connects the RTU to the UERV 4 Install the provided balancing damper assembly into the return air section of the RTU See Figure 3 5 Adjusting the balancing damper for the minimum airflow require...

Page 3: ...ee Figure 8 15 Lower the UERV on to the platform support rail then secure the UERV to the adaptor panel using the provided screws 16 On units requiring a top filler panel install panel by tucking the top of the panel under the top of the RTU and angling in so that the bottom of the panel covers the top flange of the UERV Secure with provided screws See Figure 9 Note An equipment support or pressur...

Page 4: ... 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 UERV 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 ...

Page 5: ...r 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 Maintenance Motor Maintenance All motors use prelubricated sealed bearings no further l...

Page 6: ...Options AA No Options Installed L1 Low Ambient Kit LAK L2 LAK MOA L3 LAK MOA SSJ not used on P models L4 LAK MOA SSJ PS not used on P models L5 LAK SSJ not used on P models L6 LAK SSJ PS not used on P models L7 LAK PS L8 LAK MOA and PS M1 Motorized Outside Air MOA M2 MOA SSJ not used on P models M3 MOA SSJ PS PS not used on P models M4 MOA PS S1 Stop Start Job SSJ not used on P models S2 SSJ PS no...

Page 7: ...PAGE 7 ...

Page 8: ...PAGE 8 ...

Page 9: ...ack Field Harness J160 Jack Damper Motor Harness J161 Jack Damper Exhaust Motor Harness K163 Relay Exhaust Air Motor K164 Relay Fresh Air Motor MPD 1 Missing Pulse Detector Board 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...

Page 10: ... p O 5 r e p m a d e k a t n i d e z i r o t o m l a n o i t p O 6 l o r t n o c g o j d n a t r a t s p o t s l a n o i t p O 7 d e e p s O L r o D E M r o f e r i w e r o t p u t e s d e e p s I H e h t s w o h s m a r g a i D s d e e p s O L r o D E M I H r o f d e r i w e b y a m t i n U 1 0 1 K B o t 1 0 1 H W t c e n n o c o s l A O L r o f 1 0 1 D R r o D E M r o f 1 0 1 L B t c e n n o c d...

Page 11: ...EQUIPMENT LAYOUT PAGE 11 ...

Page 12: ... ERV II SE Procedures to Backup Restore 1 Once the packaged unit is powered up the 120 second startup delay begins Once the delay expires there may or may not be a Start Up delay displayed To cancel the second time delay press the Cancel button for six seconds See Figure 1 Startup Figure 1 Update Figure 2 Backup Figure 3 2 Once the control is out of time delay mode press the Joystick down through ...

Page 13: ...ast you return by pressing the joy stick lever up until the Update screen appears Screen will read Contrler Controller Update Enter Cancel Buttons Figure 6 View Ver Figure 7 LoadFirm Figure 8 Confirm Figure 9 USB OK Figure 4 4 Press ENTER Screen will read View Ver Version Load Firm Backup 5 Toggle Joy stick down so the arrow is next to Load Firm 6 Press ENTER Screen shows software versions present...

Page 14: ...it control 1 Scroll through menus by pressing down on joystick Status Alarms Summary Commission Econ Economizer Enable Make sure this is set to Yes ERV En Figure 11 Econ En Figure 10 3 The economizer minimum setting must be set at 50 or greater Status Alarms Summary Commission PowerEx ERV Enable Make sure this is set to Yes 4 Once the ERV is set to Enable the ERV will operate any time the unit is ...

Page 15: ...PAGE 15 MAXA MI ERÔ UNITARY ENERGY RECOVERY VENTILATOR MODEL VR011A12H B12H STATIONARY INSTALLATION INSTRUCTIONS 5257541 UAI A 0616 R11A 29YSDW This Page Intentionally Left Blank ...

Page 16: ...apter panels as required Follow accessory and unit installation manuals q Verify field wiring including the wiring to any accessories q Check all multi tap transformers to insure they are set to the proper incoming voltage q Verify correct belt tension as well as the belt pulley alignment Tighten if needed q Prior to energizing the unit inspect all the electrical connections q Power the unit Bump ...

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