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Frost Control
Timed Exhaust
1. Remove power from unit.
2. Jumper the frost indicating wheel pressure switch in
the unit control center.
3. Jumper the temperature indicating thermodisc in
the unit control center. Thermodisc has a pre-set
temperature of 5ºF.
4. Set the frost control timer scale for T1 and T2 to
1m. Set the timer settings for T1 and T2 to 10.
5. Add power to the unit. Blower
should cycle on for one minute,
then turn off for one minute.
6. Remove power from unit and
remove jumpers that were
placed. Re-set timer settings.
• T1 timer setting set to 5 and
timer scale set to 10m for
5 minutes of wheel off time.
• T2 timer setting set to 5
and timer scale set to 1h for
30 minutes of wheel on time.
Electric Preheat
1. Remove power from unit.
2. Jumper the frost indicating wheel pressure switch in
the preheat control center.
3. Jumper the temperature indicating thermodisc in the
preheat control center. Thermodisc has a pre-set
temperature of 5ºF.
4. Apply power to unit. Preheater should turn on.
22
Energy Recovery Ventilator
Variable Frequency Drives
Optional factory installed, wired, and programmed
variable frequency drives (VFDs) may have been
provided for modulating or multi-speed control of the
blowers and energy recovery wheel for economizer and
frost control modes. One VFD, either Yaskawa model
V1000 or J1000, is provided for each blower (supply
air and exhaust) and one Yaskawa model J1000 is
provided for the energy recovery wheel.
Refer to the tables below for factory settings and field
ERV
wiring requirements. Refer to the unit control center for
unit specific wiring diagram. When making adjustments
outside of the factory set points, refer to Yaskawa VFD
ERV
ERV
instruction manual, which can be found online at www.
drives.com.
Timer
Scale
T1
Timer
Settings
T2
Timer
Scale
R+
R-
S+
S-
P1
P2
PC
A1
A2
+V
AC
S1
S2
S3
S4
S5
S6
S7
HC
V1000
OPTION 1 - 0-10 VDC CONTROL
USER TO PROVIDE ISOLATION AS REQUIRED
USER TO PROVIDE ISOLATION AS REQUIRED
0-10 VDC CONTROL SIGNAL (BY OTHERS)
A1 AC
A1 AC
WIRED TO A1 (+) AND AC (COMMON)
0 VDC = 30 Hz
10 VDC = 60 Hz
FOR ONE 0-10 SIGNAL, WIRE TO DRIVES IN PARALLEL
SEE VFD INSTALLATION MANUAL FOR MORE DETAIL
SEE VFD INSTALLATION MANUAL FOR MORE DETAIL
FOR CONTINUOUS 60Hz OPERATION JUMPER TERMINALS A1 AND +V
FOR CONTINUOUS 60Hz OPERATION JUMPER TERMINALS A1 AND +V
OPTION 2 - MULTI SPEED CONTROL
USER TO PROVIDE CONTACTS AND ISOLATION AS REQUIRED
USER TO PROVIDE CONTACTS AND ISOLATION AS REQUIRED
NEITHER S4 OR S5 CONTACT CLOSED
S4
S5
SC
S4
S5
DRIVE SPEED = 60 Hz
S4 TO SC CONTACT CLOSED (BY OTHERS)
DRIVE SPEED = 40 Hz
S5 TO SC CONTACT CLOSED (BY OTHERS)
DRIVE SPEED = 30 Hz
SEE VFD INSTALLATION MANUAL FOR MORE DETAIL
SEE VFD INSTALLATION MANUAL FOR MORE DETAIL
TO CHANGE THE FACTORY SET Hz CHANGE THE FOLLOWING PARAMETERS.
TO CHANGE THE FACTORY SET Hz CHANGE THE FOLLOWING PARAMETERS.
PARAMETER n01 CHANGE TO 1
PARAMETER n01 CHANGE TO 1
PARAMETER n21 FOR NEW 60Hz SETTING
PARAMETER n21 FOR NEW 60Hz SETTING
PARAMETER n22 FOR NEW 40Hz SETTING
PARAMETER n22 FOR NEW 40Hz SETTING
PARAMETER n23 FOR NEW 30Hz SETTING
PARAMETER n23 FOR NEW 30Hz SETTING
PARAMETER n01 CHANGE TO 0
PARAMETER n01 CHANGE TO 0
R+
R-
S+
S-
IG
P1
P2
PC
A1
A2
+V
AC
AM
IG
R+
R-
S+
S-
IG
S1
S2
S3
S4
S5
S6
S7
HC
AM
AC
MP
P1
P2
PC
A1
A2
+V
AC
AM
AC
MP
SC
H1
RP
MA MB MC
S1
S2
S3
S4
S5
S6
S7
HC
SC
H1
RP
MA MB MC
V1000
V1000
OPTION 1 - 0-10 VDC CONTROL
OPTION 1 - 0-10 VDC CONTROL
USER TO PROVIDE ISOLATION AS REQUIRED
0-10 VDC CONTROL SIGNAL (BY OTHERS)
0-10 VDC CONTROL SIGNAL (BY OTHERS)
WIRED TO A1 (+) AND AC (COMMON)
A1 AC
WIRED TO A1 (+) AND AC (COMMON)
0 VDC = 30 Hz
10 VDC = 60 Hz
0 VDC = 30 Hz
10 VDC = 60 Hz
FOR ONE 0-10 SIGNAL, WIRE TO DRIVES IN PARALLEL
FOR ONE 0-10 SIGNAL, WIRE TO DRIVES IN PARALLEL
SEE VFD INSTALLATION MANUAL FOR MORE DETAIL
FOR CONTINUOUS 60Hz OPERATION JUMPER TERMINALS A1 AND +V
OPTION 2 - MULTI SPEED CONTROL
OPTION 2 - MULTI SPEED CONTROL
NEITHER S4 OR S5 CONTACT CLOSED
SC
DRIVE SPEED = 60 Hz
USER TO PROVIDE CONTACTS AND ISOLATION AS REQUIRED
S4 TO SC CONTACT CLOSED (BY OTHERS)
NEITHER S4 OR S5 CONTACT CLOSED
S4
S5
SC
DRIVE SPEED = 40 Hz
DRIVE SPEED = 60 Hz
S5 TO SC CONTACT CLOSED (BY OTHERS)
S4 TO SC CONTACT CLOSED (BY OTHERS)
DRIVE SPEED = 30 Hz
DRIVE SPEED = 40 Hz
S5 TO SC CONTACT CLOSED (BY OTHERS)
DRIVE SPEED = 30 Hz
SEE VFD INSTALLATION MANUAL FOR MORE DETAIL
TO CHANGE THE FACTORY SET Hz CHANGE THE FOLLOWING PARAMETERS.
PARAMETER n01 CHANGE TO 1
PARAMETER n21 FOR NEW 60Hz SETTING
PARAMETER n22 FOR NEW 40Hz SETTING
PARAMETER n23 FOR NEW 30Hz SETTING
PARAMETER n01 CHANGE TO 0
AC
MP
SC
H1
RP
MA MB MC
S1
S2
S3
S4
S5
SC
A1
+V
AC
AM
AC
MA MB MC
J1000
S1
S2
S3
S4
S5
SC
A1
+V
AC
AM
AC
MA
J1000
®
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