Frost Control; Variable Frequency Drives - Greenheck ERVe Installation, Operation And Maintenance Manual

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 5º F.
4. Apply power to unit. Preheater should turn on.
18 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 in this section for factory settings
and field 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 instruction manual, which can be found
online at www.drives.com. For technical support,
Timer
contact Yaskawa direct at 1-800-927-5292.
Scale
T1
Timer
Settings
T2
Timer
Scale
R+ R- S+ S- IG
P1 P2 PC A1 A2 +V AC AM AC MP
S1 S2 S3 S4 S5 S6 S7 HC SC H1 RP MA MB MC
V1000
OPTION 1 - 0-10 VDC CONTROL
USER TO PROVIDE ISOLATION AS REQUIRED
0-10 VDC CONTROL SIGNAL (BY OTHERS)
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
FOR CONTINUOUS 60Hz OPERATION JUMPER TERMINALS A1 AND +V.
OPTION 2 - MULTI SPEED CONTROL
USER TO PROVIDE CONTACTS AND ISOLATION AS REQUIRED
NEITHER S4 OR S5 CONTACT CLOSED
S4 S5 SC
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
TO CHANGE THE FACTORY SET Hz CHANGE THE FOLLOWING PARAMETERS.
PARAMETER A1-01 CHANGE TO 2
PARAMETER d1-01 FOR NEW 60Hz SETTING
PARAMETER d1-02 FOR NEW 40Hz SETTING
PARAMETER d1-03 FOR NEW 30Hz SETTING
PARAMETER A1-01 CHANGE TO 0
S1 S2 S3 S4 S5 SC A1 +V AC AM AC MA MB MC
J1000