Bard W18HA-A, Руководство по установке

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Manual 2100-654C
Page 15 of 34
WIRING – MAIN POWER
Refer to the unit rating plate for wire sizing information
and maximum fuse or circuit breaker size. Each
outdoor unit is marked with a “Minimum Circuit
Ampacity”. This means that the field wiring used must
be sized to carry that amount of current. Depending
on the installed KW of electric heat, there may be
two field power circuits required. If this is the case,
the unit serial plate will so indicate. All models are
suitable only for connection with copper wire. Each
unit and/or wiring diagram will be marked “Use Copper
Conductors Only”. These instructions
must be adhered
to. Refer to the National Electrical Code (NEC) for
complete current carrying capacity data on the various
insulation grades of wiring material. All wiring must
conform to NEC and all local codes.
The electrical data lists fuse and wire sizes (75°C
copper) for all models including the most commonly
used heater sizes. Also shown are the number of field
power circuits required for the various models with
heaters.
The unit rating plate lists a maximum fuse or circuit
breaker that is to be used with the equipment. The
correct size must be used for proper circuit protection
and also to assure that there will be no nuisance
tripping due to the momentary high starting current of
the compressor motor.
The disconnect access door on this unit may be locked
to prevent unauthorized access to the disconnect. To
convert for the locking capability, bend the tab located
in the bottom left-hand corner of the disconnect
opening under the disconnect access panel straight
out. This tab will now line up with the slot in the door.
When shut, a padlock may be placed through the hole
in the tab preventing entry.
See page 20 for important information on three phase
scroll compressor start ups.
See Table 8 on page 30 for electrical specifications.
WIRING – LOW VOLTAGE WIRING
All 230/208V 1 phase and 3 phase equipment have
dual primary voltage transformers. All equipment
leaves the factory wired on 240V tap. For 208V
operation, reconnect from 240V to 208V tap. The
acceptable operating voltage range for the 240 and
208V taps are:
TAP RANGE
240 253 – 216
208 220 – 187
NOTE: The voltage should be measured at the field
power connection point in the unit and while
the unit is operating at full load (maximum
amperage operating condition).
For low voltage wiring, an 18 gauge copper, color-coded
cable is recommended. See Table 4 on page 16 for
more information.
Low Voltage Connections
These units use a 24-volt AC low voltage circuit.
The “
RT ” terminal is the 24V transformer output,
and the “ R ” terminal is the 24VAC hot terminal
for the operation of the equipment. “ RT ” and “ R ”
are connected with brass jumper bar which can be
removed and “
RT ” and “ R ” connected to external
NC (normally closed) contact such as a fire/smoke
detector that will cause immediate shutdown of the
equipment upon activation.
“ C ” terminal is 24VAC common and is grounded .
“ G ” terminal is the fan input .
“ Y1 ” terminal is the 1st Stage input for cooling.
“ Y2 ” terminal is the 2nd Stage compressor input for
cooling (if equipped with an economizer).
“ B/W1 ” terminal is the reversing valve input. The
reversing valve must be energized for heating mode.
“
W2 ” terminal is the 2nd stage heat (if equipped).
“ W3 ” terminal is the emergency heat input. This
terminal energizes the emergency heat relay. This is
not applicable on units with dehumification.
“
A ” terminal is the ventilation input . This terminal
energizes any factory-installed ventilation option and
indoor blower.
“
D ” terminal is the dehumidification input. If
installed, this terminal energizes any factory-installed
dehumidification option.
"L/1" terminal is the
compressor lockout output . This
terminal is activated on a high or low pressure trip by
the electronic heat pump control. This is a 24VAC
output.
LOW VOLTAGE CONNECTIONS FOR DDC CONTROL
Standard Units
Units w/
Economizers
Fan Only Energize G Energize G
1st Stage
Cooling Mode
Energize Y1, G Energize Y1, G
2nd Stage
Cooling Mode
Energize Y1, Y2, G
Heat Pump Heating
Energize Y1, G,
B/W1 Energize Y1, G,
B/W1
2nd Stage Heating
w/heat pump
(if employed)
Energize Y1, G,
B/W1, W2 Energize Y1, G,
B/W1, W2
Ventilation Energize A Energize A
Dehumidification
(if employed)
Energize D Energize D
Emergency Heat*
Energize G, W2,
W3 Energize G, W2,
W3
* Not applicable on units with dehumidification