CRV-S
ERIES
I
NSTALLATION
, O
PERATION
AND
S
ERVICE
M
ANUAL
80 of 83
1
8
.2 Replacement Parts Instructions
1
8
.2.1 Variable Fre
q
uency Drive (VFD)
To replace the Variable Freq
u
ency Dri
v
e, t
u
rn off all
po
w
er to the dri
v
e assembly at the breaker or discon-
nect s
w
itch. T
u
rn off the 24 V po
w
er s
w
itch on the
relay board. T
u
rn off 120 V po
w
er to the relay board
inside the ROBERTS GORDON
®
ULTRAVAC
™
Con-
troller or the mod
u
lating thermostat.
Mark all
w
ires connected to the VFD, noting the ter-
minals that they are sec
u
red to. Remo
v
e all
w
ires
from the VFD terminals.
Remo
v
e the VFD from its mo
u
nting plate by remo
v
-
ing the fo
u
r sec
u
ring scre
w
s.
Verify that the inp
u
t
v
oltage noted on the rating plate
of the VFD matches the inp
u
t
v
oltage of the old VFD.
Sec
u
re the ne
w
VFD to the mo
u
nting plate
w
ith the
fo
u
r scre
w
s. Ret
u
rn all
w
ires to the correct VFD ter-
minals. If possible, it may be easier to partially re-
w
ire the ne
w
VFD before mo
u
nting it to the mo
u
nting
plate.
Close the door and ret
u
rn po
w
er to the VFD. Ret
u
rn
120 V po
w
er to the relay board or mod
u
lating ther-
mostat. T
u
rn on the 24 V po
w
er s
w
itch on the relay
board. Press the reset b
u
tton on the control board
and close the doors.
1
8
.2.2 Variable Fre
q
uency Drive 25 A or 10 A Fuse
To replace a f
u
se, t
u
rn off inp
u
t po
w
er to the
v
ariable
freq
u
ency dri
v
e assembly at the breaker or
disconnect s
w
itch.
T
u
rn off 120 V po
w
er to the relay board inside the
ROBERTS GORDON
®
ULTRAVAC
™
Controller or
mod
u
lating thermostat. T
u
rn off the 24 V po
w
er
s
w
itch on the relay board.
Inside the VFD assembly, open the f
u
se holder by
p
u
lling do
w
n the le
v
er to expose the f
u
se. Remo
v
e
the old f
u
se and insert a ne
w
f
u
se. Verify the correct
f
u
se rating, 25 A for 1 HP 120 V VFD or 2 HP 230 V
VFD, 10 A for the.75 HP 230 V VFD, 1 HP 460 V VFD
and 2 HP 460 V VFD. Close the f
u
se holder. Ret
u
rn
po
w
er to the VFD assembly and
v
erify that the VFD
LCD screen is on. (dashes displayed). Close the
VFD assembly door.
Ret
u
rn 120V po
w
er to the relay board or mod
u
lating
thermostat. T
u
rn on 24 V po
w
er s
w
itch on the relay
board. Press the reset b
u
tton on the control board
and close the doors.
DANGER
Electrical Shock Hazard
Disconnect electric before service.
Controller must be properly grounded to an
electrical source.
Failure to follow these instructions can
result in death or electrical shock.
Summary of Contents for CoRayVac CRV-B-10
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Page 71: ...SECTION 13 STARTING THE SYSTEM 65 of 83 FIGURE 42 Vacuum Reading ...
Page 81: ...SECTION17 TROUBLESHOOTING 75 of 83 17 1 Troubleshooting Flow Chart ...
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