JOHNSON CONTROLS
11
Form 160.00-N6
Issue date: 08/27/2021
1
1. The Medium Voltage Variable Speed Drive (MV-
VSD) and Compressor motor frame must be
grounded in accordance with the 2005 National
Electrical Code (NEC),
Paragraph 250-118
, for
equipment grounding. When a separate grounding
conductor is required, it must be a copper conductor
only and sized per the 2005 NEC (
Table 250-122
).
In accordance with the 2005 NEC (
Paragraph
250-120 [f][1]
), where multiple parallel conduits
are used, each must contain a grounding conductor.
2. Johnson Controls does not supply wiring, elec-
trical conduit, junction boxes, fused disconnect
switches (FDS), or circuit breakers, starters (M),
push-button stations (PB), manual-off-automatic
switch (S), flow switch (FLS), and control relays,
unless otherwise specified.
3. Items marked (*) are provided by Johnson Con-
trols.
4. Items marked (**) are available from Johnson
Controls at additional cost.
5. The control center power supply, 115 V, 50 Hz
and 60 Hz, 2.0 KVA capacity for control center
only, is supplied by a control power transformer
(1T) mounted within the MVVSD as standard.
6. The motor power conduit connection location,
motor full load amperes (FLA), and inrush am
-
peres are as described in product specific draw
-
ings. Multiple conduits must contain an equal
number of wires from each phase in each conduit
to prevent overheating as stated in the 2005 NEC
(
Paragraph 300-20 [a]
). Use copper conductors
only. Do not use aluminum conductors.
7. A removable cover plate without knockouts is
supplied for connection of the power supply con-
duits. See
for drive information.
8. A condenser water pump motor starter (3M) holding
coil must be supplied for 115 V, 50 Hz and 60 Hz.
The power requirements for the water pump starter
(3M) must be a maximum of 1 A holding and 10 A
inrush. If power requirements exceed this value,
equip the coil for line voltage, and thecontrol relay
with 115 V coil.
9. Wire #14 AWG copper for one way distance of less
than 175 ft. Wire #12 AWG copper for one way dis-
tance of more than 175 ft, but less than 300 ft.
10.
The following interconnecting wires are field sup
-
plied when a YORK MVVSD is used. Refer to
field connection documents and wiring diagrams
for applicable product
.
a. 120 VAC power: control panel wire; sin-
gle conductor, stranded, 10-12 AWG,
600 V, 75°C to 90°C, THWN
or UL style
1028/1015, UL listed and CSA approved,
insulation must be moisture-resistant ther-
moplastic (PVC). System fault/run com-
mand: control panel wire; single conductor,
stranded, 14-18 AWG, 600 V, 75°C to 90°C,
THWN or UL style 1015, UL listed and CSA
approved, insulation must be moisture resis-
tant thermoplastic (PVC)
b. Drive to oil pump motor starter: wire; 3-con-
ductor plus ground cable, stranded 14 AWG,
600 V 75°C to 90°C, THHN/THWN in con-
duit, UL Listed and CSA approved. Building
wire must be in accordance with the current
NEC standard.
c. Modbus comms: drive to control panel; 025-
28701-003 wire; 3 conductor with foil shield
and drain wire 20 AWG 300 V, 80°C, UL
style 2464, UL listed and CSA approved;
Alpha 5463, Belden 9364, Quabbin 022 or
equivalent. Range 18 AWG to 22 AWG.
11. Oil pump and drive power supply, 460 V for 60
Hz, 400 V for 50 Hz, is supplied by a control
power transformer mounted within the MVVSD
as standard.
Table 2 -
Oil pump/drive power supply
Three-
phase
voltage
Hz
Oil pump
drive
panel (A)
2 hp
Control
power (1T)
transformer
(A)
FDS1
Oil pump
drive
panel fuse
460
60
3.6
4.5
6
400
50/60
4.3
5.3
7
12. The YORK MVVSD (2.3 Kv to 6.6 Kv) have high
interrupting capacity current limiting fuses and an
integral non-load disconnect function. The MV-
VSD do not require the use of FDS2, provided
the MVVSD is placed in sight of the chiller. If
the FDS2 is required, the minimum ampere rating
must be 1.15X (compressor motor amps and con-
trol power amps and oil pump amps). See
Note 11
for additional information for oil pump and con-
trol transformer amps.
Section 1 - Field connection notes
