Installation guide

LEGEND
FLA -- Full Load Amps
LRA -- Locked RotorAmps C US
MCA -- Minimum Circuit Amps
MOCP -- Maximum Overcurrent Protection
RLA -- Rated Load Amps
*Heater capacity (K3N) based on heater voltage of 208v, 240v, & 480v.
If power distribution voltage to unit varies from rated heater voltage,
heater KW will vary accordingly.
NOTES:
1. In compliance with NEC (National Electrical Code) requirements
for multimotor and combination lead equipment (refer to NEC
Articles 430 and 440), the overcurrent protective device for the
unit sha# be Power Supply fuse. The CG_ (CanaOfan Gas
Association) 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 _mbalance 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: Supply voltage is 460-3-60.
A B C AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage = 452 ÷ 464 ÷ 455
3
= 1371
= 457
Determine maximum deviation from average voltage.
(A8) 457 452=5v
(BC) 464 457=7v
(AC) 457 455=2v
Maximum deviation is 7 v.
Determir_ _ercent of v_ttage _'nbalance.
% Voltage Imbalance = 100 x 7
457
= 1.53%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%,
IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
C99024
Fig. 16--Electrical Data Legend
©
®
@--
THERMOSTAT
AND SUBBASE
L
L._
-_'_ BRN --
--_ ORN --
"J_-- RED --
UNIT CONTROL POWER
SPLICE BOX
Fig. 17---Control Connections
C99056
SINGLE-PHASE
CONNECTIONS
TO DISCONNECT
PER NEC
3-PHASE
CONNECTIONS
LEGEND
GROUND LUG
INSLPICE BO;_
G_R_Oq.MD__ =
LEAD I
L1 ~ _--- BLK--
[-2 ........ _'_ YEL-
L3 - - _-_BLU--
NOTE: Use copper wire only.
NEC - National Electrical Code
- - - Field Wiring
Splice Connections
C99057
Fig. 18_lJne Power Connections
/
24 V Circuit Breaker
24 Volt Compartment - J
Fig. 19_Control Wiring Plate
TRANSFORMER CIRCU]T CONTAINS A MANUAL
RESET OVERCURRENT PROTECTOR
IT WILL NOT AUTOMATJCALLY RESET
DISCONNECT POWER PRIOR TO
SERVICING
THIS COMPARTMENT MUST BE CLOSED
EXCEPT WHEN SERVICING
Fig. 20---Transformer Label
099070
099058
15