Replacement Parts Instructions - Roberts Gorden CoRayVac CRV-B-2 Installation, Operation & Service Manual

CRV-S I , O
ERIES NSTALLATION PERATION AND

18.2 Replacement Parts Instructions

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.
18.2.1 Variable Frequency Drive (VFD)
To replace the Variable Frequency Drive, turn off all
power to the drive assembly at the breaker or discon-
nect switch. Turn off the 24 V power switch on the
relay board. Turn off 120 V power to the relay board
inside the ROBERTS GORDON
troller or the modulating thermostat.
Mark all wires connected to the VFD, noting the ter-
minals that they are secured to. Remove all wires
from the VFD terminals.
Remove the VFD from its mounting plate by remov-
ing the four securing screws.
Verify that the input voltage noted on the rating plate
of the VFD matches the input voltage of the old VFD.
Secure the new VFD to the mounting plate with the
four screws. Return all wires to the correct VFD ter-
minals. If possible, it may be easier to partially re-
wire the new VFD before mounting it to the mounting
plate.
Close the door and return power to the VFD. Return
120 V power to the relay board or modulating ther-
mostat. Turn on the 24 V power switch on the relay
board. Press the reset button on the control board
and close the doors.
18.2.2 Variable Frequency Drive 25 A or 10 A Fuse
To replace a fuse, turn off input power to the variable
frequency drive assembly at the breaker or
disconnect switch.
Turn off 120 V power to the relay board inside the
ROBERTS GORDON ®
modulating thermostat. Turn off the 24 V power
80 of 83
S M
ERVICE ANUAL
® ™
ULTRAVAC
ULTRAVAC ™ Controller or
switch on the relay board.
Inside the VFD assembly, open the fuse holder by
pulling down the lever to expose the fuse. Remove
the old fuse and insert a new fuse. Verify the correct
fuse 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 fuse holder. Return
power to the VFD assembly and verify that the VFD
LCD screen is on. (dashes displayed). Close the
VFD assembly door.
Return 120V power to the relay board or modulating
thermostat. Turn on 24 V power switch on the relay
board. Press the reset button on the control board
and close the doors.
Con-