12
Table 6 – LP Gas Conversion*
ELEVATION
(ft)
LP GAS ORIFICE†
Low
Heat
Med.
Heat
High Heat
(6 Cell)
High Heat
(8 Cell)
0-1,999
35
38
35
35
2,000
36
39
36
36
3,000
36
39
36
36
4,000
37
40
37
37
5,000
37
40
37
37
6,000
38
41
38
38
7,000
39
42
39
39
8,000
40
43
40
40
9,000
41
44
41
41
10,000
42
45
42
42
*As the height above sea level increases, there is less oxygen per cubic ft.
of air. Therefore, heat input rate should be reduced at higher altitudes.
Includes a 4% input reduction per each 1000 ft.
Step 10 — Make Electrical Connections
Field Power Supply
(For more details, refer to the Controls, Start--Up, Operation, and
Troubleshooting manual).
Unit is factory wired for voltage shown on unit nameplate. Be sure
to check for correct voltage.
All 208/230-v units are factory wired for 230-v power supply. If
the 208/230-v unit is to be connected to a 208-v power supply,
transformers (TRAN1 and TRAN2) must be rewired by moving
the black wire with the
1
/
4
-in. female quick connect from the
230-volt connection and moving to the 200-volt
1
/
4
-in. male
terminal on the primary side of the transformer.
When installing units, provide disconnect per NEC (National
Electrical Code) of adequate size (MOCP [Maximum Overcurrent
protection] of unit is on the informative plate). (See Table 7 and 8.)
All field wiring must comply with NEC and local codes. Size wire
based on MCA (Minimum Circuit Amps) on the unit informative
plate. See Fig. 14 for power wiring connection to the unit power
terminal block and equipment ground.
Route power and ground lines through control box end panel or
unit basepan (see Fig. 4) to connections as shown on unit wiring
diagram and Fig. 14.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
The correct power phasing is critical to the operation of the
scroll compressors. An incorrect phasing will result in
compressor shutdown on thermal overload and possible
damage to compressor. Should this occur, power phase
correction must be made to the incoming power.
CAUTION
!
LEGEND
EQUIP
- Equipment
GND
- Ground
NEC
- National Electrical Code
TB
- Terminal Board
NOTE: The maximum wire size for TB1 is 2/0
C06293
Fig. 14 -- Field Power Wiring Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Unit cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of personal
injury if an electrical fault should occur. This ground may
consist of electrical wire connected to unit ground lug in
control compartment, or conduit approved for electrical
ground when installed in accordance with NEC; ANSI
(American National Standards Institute)/NFPA (National
Fire Protection Association), latest edition, and local
electrical codes.
Do not use gas piping as an electrical
ground.
!
WARNING
Field wiring must conform to temperature limitations for type “T”
wire. All field wiring must comply with NEC and local
requirements.
Operating voltage to compressor must be within voltage range
indicated on unit nameplate. On 3-phase units, voltages between
phases must be balanced within 2%.
Unit failure as a result of operation on improper line voltage or
excessive phase imbalance constitutes abuse and may cause
damage to electrical components.
Field Control Wiring (Units Without Optional
Humidi--MiZer
t
Adaptive Dehumidification System)
Unit can be controlled with either a Carrier-approved accessory
thermostat or a Carrier-approved space temperature sensor. Install
thermostat according to the installation instructionsincluded with
accessory. Locate thermostat assembly or space temperature sensor
on a solid interior wall in the conditioned space to sense average
temperature.
48PM20
--
28
