User Guide
13
PREPARATION
Follow these steps to ensure accurate measurements:
• Seal all the ductwork with tape. Close all windows and doors.
• Turn off all exhaust devices such as range hood, dryer and bathroom fans.
• Make sure the balancing dampers are fully open.
• If the installation is in any way connected to the ductwork of the cold air return of a furnace/air
handler, make sure that the furnace/air handler blower is ON. If not, leave furnace/air handler blower
OFF.
• If the outside temperature is below 32°F, make sure the unit is not running in defrost mode while
balancing by waiting 10 minutes after plugging the unit in.
• Set the unit to high speed.
BALANCING PROCEDURE
1. Place the magnehelic gauge on a level surface and adjust it to zero.
2. Connect tubing from gauge to EXHAUST airflow pressure taps (see diagram on unit door).
3. Be sure to connect the tubes to their appropriate high/low fittings. If the gauge drops below zero, reverse the tubing connections.
4. Note the CFM value from balancing chart on the unit.
5. Repeat steps 3 and 4, but to FRESH airflow pressure taps.
6. Using the appropriate adjustable balancing damper, lower the highest value so it matches the lowest value. A difference up to ±10cfm
is acceptable.
7. Secure both dampers in place with a fastening screw (included in the hardware kit).
8. Write the required airflow information on a label and stick it near the unit for future reference (date, maximum speed air flows, your
name, phone number and business address).
6. BALANCING THE UNIT
VD0431
CLOSED
OPEN
The fresh air flow must not be higher than the exhaust air flow.
CAUTION
5. SPEED SELECTION
The factory set high-speed value for theses units is 129 CFM, and low speed value is approximately 66 CFM. To change these values, the
transformer wire taps connections must be changed and/or JU1 jumper must be relocated (see table and illustration below).
J14
10
9
8
7
6
5
4
3
2
1
J20
12
J13
ICP
A1
ELECTRONIC
ASSEMBLY
12345
J12
J11
12
4321
J9
J10
21
F1
3A
3AG T
YPE
321
JU1
MH
4321
5
J8
J5
J7
1
1
2
2
3
J6
1
2
J4
1
2
3
T1
24 V Class 2
Optional
9.5 V
Class 2
120 V
100 V
83 V
68 V
62 V
neutral
BK
O
W
R
NC
NC
Y
Y
O
O
P
BL
R
O
COLOR CODE
BLACK
BLUE
GREEN
ORANGE
BK
BL
G
O
PURPLE
RED
WHITE
YELLOW
P
R
W
Y
NO CONNECTION
NC
LOW
SPEED
HIGH
SPEED
VE0429A
R
NC
NC
321
JU1
MH
4321
HRV130FLS ERV130FLS
Speed option Connection
Pressure
(in. w.g.)
Supply
(CFM)
Exhaust
(CFM)
Power
consumption
(Watts)
Supply
(CFM)
Exhaust
(CFM)
Power
consumption
(Watts)
High no. 1 (Default) JU1 in H (1-2) 0.4 129 150 125 129 130 124
High no. 2 JU1 in M (2-3) 0.4 110 130 104 110 112 103
Low no. 1 PURPLE-RED 0.3 95 105 80 95 96 79
Low no. 2 (Default) BLUE-RED 0.2 65 70 64 65 66 62
Low no. 3 RED-RED 0.2 45 50 53 45 46 52
Low speed selection
High speed selection