Carrier 07KHP, Installation Manual

Page: 6 / 14

6
ELECTRICAL CONNECTIONS
POWER WIRING
•
Unit is factory wired for voltage shown on nameplate.
•
Provide adequate fused disconnect switch within sight of unit,
readily accessible but out of reach of children.
•
Provision for locking switch open (off) is advisable to prevent
power from being turned on while unit is installed or serviced.
•
Disconnect switch, fuses and field wiring must comply with
local codes. Size the wire as per electrical specification shown
in CCAC Service Installer Blue Book.
•
Use terminal marked ‘L’ and ‘N’ for 230V-1Ph-60Hz (or 230V-
3Ph-60Hz for 3phase) power supply. See respective wiring
diagram shown on the preceding pages.
CONTROL CIRCUIT WIRING
•
For FCU model 42LX036-060, Wall mounted Thermostat
complete with 3 speed switch and CDU factory wired
minimum 3/5 minutes time delay is standard. Do not reset the
delay time to lower setting.
•
All 07KHP models are equipped with High Pressure switch to
protect Compressor from overload condition. This is an auto –
reset type, no necessary changes or alteration is required in
the field.
•
Use terminal block marked ‘S1’ for Compressor signal control
.
All final electrical connections must be made with a length of flexible
conduit to minimize vibration and sound transmission to the building.
Field wiring must comply with local and national fire, safety and
electrical codes.
SUPPLY VOLTAGE
Operating voltage to unit must be within voltage range indicated in
Table 1. On 3-phase units voltage imbalanced must be within 2%. Use
the following formula to determine the percent voltage imbalance. In
some areas where single phasing is more likely to occur, the electrical
contractor/Installer is encourage to install a voltage phase protector to
protect the unit from single phasing.
This amount of phase imbalance is satisfactory as it is below
the maximum allowable 2%.
Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to
electrical components.
OPERATION AND START-UP
PRELIMINARY CHECKS
Before operating the unit be sure the following are in order.
1.
All wiring connections are correct and tight.
2. All barriers, covers and panels are in place.
3. Electrical power supply conform to unit’s requirement.
4. Water piping system are flushed and clean.
5. Water system is chemically treated.
6. Water inlet temperature is maintained around 29.5°C (85°F).
7. All joints are leak tested and leak free.
8. All valves are opened.
TO START UNIT
1. Field disconnect switch is closed.
2. Set room temperature below ambient setting.
3. Compressor will start once time delay has elapsed (3 or 5 minutes
is standard depending on model)
4. Operate unit for 30 minutes, then check system refrigerant charge.
Consult the unit wiring diagram located on the inside of the
access panel to ensure proper electrical hookup. Route power
supply and signal wires through opening in unit’s side panel to
their respective terminals.
Check all electrical connections,
including factory wiring within the unit and make sure all
connections are tight.
WARNING
TO AVOID POSSIBLE INJURY OR DEATH DUE TO
ELECTRICAL SHOCK, OPEN THE POWER SUPPLY
DISCONNECT SWITCH (SWITCH-OFF) AND SECURE
IT IN AN OPEN POSITION DURING INSTALLATION.
USE LOCK-OUT AND TAG-OUT SECURITY LOCKS!
CAUTION
THE CONTROL VOLTAGE FROM THE FAN COIL UNIT
MUST BE OF 230V. DO NOT CONNECT THE POWER
SUPPLY TO THE
SIGNAL
%Voltage Imbalance
max voltage deviation from average voltage
= 100 x
average voltage
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:
(AB) 457 - 452 = 5 v
(BC) 464 - 457 = 7 v
(CA) 457 - 455 = 2 v
Maximum deviation is 7 v.
Determine percent voltage imbalance:
7
% Voltage Imbalance = 100 x
457
= 1.53%