User`s manual

LEGEND
FLA -- Full Load Amps
LRA -- Locked Rotor Amps
MCA -- Minimum Circuit Amps
MOCP -- Maximum Overcurrent Protection
RLA -- Rated Load Amps
CKT BKR -- Circuit Breaker
NOTES:
1. tn compliance with NEC (National Electrical Code) requirements
for muttimotor and combination load equipment (refer to NEC
Articles 430 and 440), the overcurrent protective device for the
unit shall be Power Supply fuse. Canadian units may be
fuse or circuit breaker.
2. Minimum wire size is based on 60 C copper wire. If other than
60 C wire is used, or if length exceeds wire length in table,
determine size from NEC.
3. Unbalanced 3-Phase Supply 'Voltage
Never operate a motor where a phase imbalance in supply volt-
age is greater than 2%. Use the following formula to determine
the percentage of 'voltage imbalance.
% Voltage imbalance
= 100 x max voltage deviation from average voltage
average voltage
EXAMPLE: Suppty voltage is 460-3-60.
A B C AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage = 452 + 464 + 455
3
_ 1371
3
= 457
Determine maximum deviation from average 'voltage.
(AB) 457 452=5v
(BC) 464 457=7v
(AC) 457 455=2v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x --
457
: 1.53%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: tf the supply 'voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
c99024
Table4_Legend
2. Connect ground lead to chassis ground connection
3. Locate the black and yellow wires connected to the lines side
of the contactor
4. Connect field L1 to black wire on connection 11 of the
compressor contactor
5. (onnect field wire L2 to yellow wire on connection 13 of the
compressor contactor
6. (onnect field wire L3 to Blue wire flora compressor
SPE(IAL PRO(EDURES FOR 208-V OPERATION
N
iii_ iiiiiiiiiii_,
Be_bre making any wiring changes, make sure the gas supply
is switched off first. Thet_ switch off the power st_pply to the
unit and install tockot_t tag. Electrical shock can cause serious
injury or death.
CONTROL VOLTAGE CONNE( TIONS
Do not use any type of power-stealing thermostat Unit control
problems may result.
Use no. 18 American Wire Gage (AWG) color-coded, insulated
(35 C minimum) wires to make the control voltage connections
between the thermostat and the unit. If the thermostat is located
more than 100 ft flora the unit (as measured along fl_e control
voltage wires), use no. 16 AWG color-coded, insulated (35 C
minimmn) wires.
Standard ( onnection
Remove knockout hole located in the flue panel adjacent to the
control access panel (See Fig. 2 and 3). Remove the rubber
grommet fi'om the installer's packet (included with unit) and install
grommet in the knockout opening. Provide a drip loop before
running wire through panel.
Rtm the low-voltage leads fiom the thermostat, through the inlet
hole, and into unit tow-voltage splice box.
Locate five 18-gage wires leaving control box. These low-voltage
connection leads can be identified by the colors red, green, yellow,
brown, and white (See Fig. 1 i). Ensure the leads are long enough
to be routed into the low-voltage splice box (located below right
side of control box). Route leads through hole in bottom of control
box and make tow-voltage connections (See Fig 11) Secure all
cut wires, so that _hey do not interI:_re with operation of unit.
HEAT ANTICIPATOR SETTING
The room thermostat heat anticipator must be properly adjusted to
ensure proper heating performance. Set the heat anticipator, using
an ammeter between the W and R terminals to determine the exact
required setting.
NOT_:: For thermostat selection purposes, use 0.18 amp for fl-le
approximate required setting. Failure to make a proper heat
anticipator adjustment will result in improper operation, discom-
fort to the occupants of the conditioned space, and inefficient
energy utilization; however, the required setting may be changed
slightly to provide a greater degree of comfort for a particular
installation.
TRANSFORMER PROTE( TION
The tra_,_former is of fl_e energy-limiting type. It is set to
withstand a 30-sec. overload or shorted secondary condition.
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