ICP CHS180, Инструкция по установке, запуску и обслуживанию

Страница: 7 / 17

Split System Heat Pumps Installation Instructions
7
Electrical Wiring
Electrical Shock Hazard.
Failure to shut off electric power could result in,
property damage, personal injury and/or death.
Shut off electric power at fuse box or service pan-
el before making any electrical connections.
WARNING
POWER WIRING -- Electrical characteristics of available
power supply and power supply tolerances must agree
with nameplate rating. Phase imbalance must not exceed
2%. Operation of unit on improper supply voltage or with
excessive phase imbalance constitutes abuse and is not
covered by warranty. See Fig. 4 to determine phase
imbalance.
Unit is factory wired for voltage shown on nameplate.
Provide adequate fused disconnect switch within sight
from unit and readily accessible from unit, but out of the
reach of children. Lock switch open (off) to prevent power
from being turned on while unit is being serviced.
Disconnect switch, fuses, and field wiring must comply with
national and local code requirements.
Route power wires through opening in unit end panel to
connection in unit control box as shown on unit label
diagram. Unit must be grounded.
N
EXAMPLE: Supply voltage is
460--3--60.
AB = 452 v
BC = 464 v
AC = 455 v
452 + 464 + 455
Average Voltage =
3
1371
=
3
= 457
Determine maximum deviation from average voltage.
Maximum deviation is 7 v.
Determine percent 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 : If the supply voltage phase imbalance is more than
2%, contact your local electric utility company immediately .
(AB) 457 -- 452 = 5 V
(BC) 464 -- 457 = 7 V
(AB) 457 -- 455 = 2 V
Unbalanced 3- Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage
greater than 2%. Use the following formula to determine the percent
voltage imbalance.
Fig. 4 Determining Phase Imbalance
If unit will be operating at 208--3--60 power, remove the wire
from the transformer primary connection labelled ‘‘230”
and move it to the connection labelled ‘‘208”. See Fig. 5.
For 460v wiring and details, see Fig. 6.
CONTROL CIRCUIT WIRING -- Control voltage is 24 v.
See unit label diagram for field--supplied wiring details.
Route control wires through opening in unit end panel to
connection in unit control box.
A crankcase heater is wired in the control circuit so it is
always operable as long as power supply disconnect is on,
even if any safety device is open or unit stop/start switch is
off.