44
Fig. 64 — Disconnect Switch and Unit (Size 16)
FIELD WIRING FOR 50TC 16 UNITS
All field wiring must comply with the NEC and local
requirements.
All units except 208/230-v units are factory wired for the volt-
age shown on the nameplate. If the 208/230-v unit is to be con-
nected to a 208-v power supply, the control transformer must
be rewired by moving the black wire with the
1
/
4
-in. female
spade connector from the 230-v connection and moving it to
the 200-v
1
/
4
-in. male terminal on the primary side of the trans-
former. Refer to unit label diagram for additional information.
Size wire based on MCA (Minimum Circuit Amps) on the unit
informative plate. See Fig. 63 and the unit label diagram for
power wiring connections to the unit power terminal blocks
and equipment ground. Maximum wire size is 2/0 AWG per
pole.
Provide a ground-fault and short-circuit over-current protection
device (fuse or breaker) per NEC Article 440 (or local codes).
Refer to unit informative data plate for MOCP (Maximum
Over-current Protection) device size.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. On 3-phase
units, voltages between phases must be balanced within 2%
and the current within 10%. Use the following formula to de-
termine the percent of voltage imbalance.
% Voltage Imbalance:
Example: Supply voltage is 230-3-60
Determine maximum deviation from average voltage.
(AB) 227-224 = 3 v
(BC) 231-227 = 4 v
(AC) 227-226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
This amount of phase imbalance is satisfactory as it is below the maxi-
mum allowable 2%.
NOTE: Check all factory and field electrical connections for tightness.
Units Without Factory-Installed Disconnect
When installing units, provide a disconnect switch of adequate
size per NEC (National Electrical Code). Disconnect sizing
data is provided on the unit informative plate. Locate discon-
nect sizing data on unit cabinet or within sight of the unit per
national or local codes. Do not cover unit informative plate if
mounting the disconnect on the unit cabinet.
Units with Factory-Installed Disconnect
The factory-installed option disconnect switch is located in a
weatherproof enclosure located under the main control box (see
Fig. 65). The manual switch handle is accessible through an open-
ing in the access panel. Discard the factory test leads (see Fig. 63
on page 43). The factory disconnect is an 80A disconnect.
Field-Install the NFD Shaft and Handle
1. Remove the Control Box access panel. The NFD enclo-
sure is located below the Control Box (see Fig. 65).
2. Remove (3) cap head screws that secure the NFD enclo-
sure front cover — (2) on the face of the cover and (1) on
the left side cover. See Fig. 66.
3. Remove the front cover of the NFD enclosure.
4. Make sure the NFD shipped from the factory is at OFF
position (the arrow on the black handle knob is at OFF).
5. Insert the shaft with the cross pin on the top of the shaft in
the horizontal position. See Fig. 66.
6. Measure from the tip of the shaft to the top surface of the
black pointer; the measurement should be 3.75 to 3.88 in.
(95 to 99 mm).
7. Tighten the locking screw to secure the shaft to the NFD.
8. Turn the handle to the OFF position with red arrow point-
ing at OFF.
9. Install the handle on to the painted cover horizontally with
the red arrow pointing to the left.
10. Secure the handle to the painted cover with (2) screws and
lock washers supplied.
11. Engaging the shaft into the handle socket, re-install (3)
hex screws on the NFD enclosure.
Re-install the unit front panel.
WARNING
FIRE HAZARD
Failure to follow this warning could result in personal inju-
ry, death, or property damage.
Do not connect aluminum wire between disconnect switch
and unit. Use only copper wire.
= 100 x
max voltage deviation from average voltage
average voltage
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage
=
(224 + 231 + 226)
=
681
= 227
3
3
% Voltage Imbalance = 100x
4
= 1.78%
227
COPPER
WIRE ONLY
ELECTRIC
DI
S
CONNECT
S
WITCH
ALUMINUM
WIRE
A
B
C
MOTOR
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Operation on improper line voltage or excessive phase im-
balance constitutes abuse and may cause damage to electri-
cal components. Such operation would invalidate any ap-
plicable Carrier warranty.
Summary of Contents for WeatherMaker 50TC07 Series
Page 4: ...4 Fig 2 Dimensional Drawing for Units Built on and After 4 15 19 Size 07 ...
Page 5: ...5 Fig 3 Dimensional Drawing for Units Built Prior to 4 15 19 Size 07 ...
Page 6: ...6 Fig 4 Corner Weights and Clearances Size 07 ...
Page 7: ...7 Fig 5 Base Rail Details Size 07 ...
Page 8: ...8 Fig 6 Thru the Base Charts Size 07 ...
Page 9: ...9 Fig 7 Unit Dimensional Drawing Size 08 09 12 ...
Page 10: ...10 Fig 7 Unit Dimensional Drawing Size 08 09 12 cont ...
Page 11: ...11 Fig 8 Unit Dimensional Drawing Size 14 ...
Page 12: ...12 Fig 8 Unit Dimensional Drawing Size 14 cont ...
Page 13: ...13 Fig 9 Unit Dimensional Drawing Size 16 Unit ...
Page 14: ...14 Fig 9 Unit Dimensional Drawing Size 16 Unit cont ...
Page 19: ...19 Fig 14 Roof Curb Details Size 16 Unit ...
Page 26: ...26 Fig 34 50TC 07 Control Wiring Diagram ...
Page 27: ...27 Fig 35 50TC 07 Power Wiring Diagram ...
Page 28: ...28 Fig 36 50TC M08 12 Control Wiring Diagram ...
Page 29: ...29 Fig 37 50TC D E Wiring Diagram 08 14 Size Units ...
Page 30: ...30 Fig 38 Single Stage Cooling without VFD Power Wiring Diagram Sizes 08 12 ...
Page 31: ...31 Fig 39 2 Stage Cooling with VFD Power Wiring Diagram Sizes 08 12 ...
Page 32: ...32 Fig 40 2 Stage Cooling with VFD Power Wiring Diagram Size 14 ...
Page 33: ...33 Fig 41 50TC 16 Wiring Diagram ...
Page 34: ...34 Fig 42 2 Stage Cooling with VFD Power Wiring Diagram Size 16 ...
Page 35: ...35 Fig 43 50TC 07 Units Wiring Diagram with Humidi MiZer System Option ...
Page 36: ...36 Fig 44 50TC 08 14 Units Wiring Diagram with Humidi MiZer System Option ...
Page 37: ...37 Fig 45 50TC 16 Wiring Diagram with Humidi MiZer System Option ...
Page 69: ...69 Fig 97 Typical PremierLink Control Wiring Diagram Size 07 Shown ...
Page 70: ...70 Fig 98 50TC M08 12 PremierLink Control Wiring Diagram ...
Page 71: ...71 Fig 99 Typical PremierLink Control Wiring Diagram Dual Compressor Sizes 08 12 shown ...
Page 72: ...72 Fig 100 Typical PremierLink Control Wiring Diagram with Humidi MiZer System Option ...
Page 73: ...73 Fig 101 Typical RTU Open Controller Wiring Diagram 50TC 07 Units ...
Page 74: ...74 Fig 102 50TC M08 12 RTU Open Controller Wiring Diagram ...
Page 75: ...75 Fig 103 Typical RTU Open Controller Wiring Diagram 50TC D E08 14 Units ...
Page 76: ...76 Fig 104 RTU Open Controller Wiring Diagram 50TC 16 Unit ...
Page 83: ...83 Fig 113 UltraTech Scroll Compressor ...
Page 84: ......
Page 85: ......