Page - 35
NOTICE
Failure to heed the following may result in damage to equipment.
l
The wire size connecting the heat pumps must be 22-gauge, 2-conductor,
low-voltage wire. Be sure that the size of the wire will allow at least two
wires per connection point.
l
Do not attempt to connect heat pump equipment in multiple configurations
with previous HP7 and HP7R versions of the microprocessor. See
No onboard port is provided for heat pumps with these microprocessor
versions. An Automatic Sequencing Controller (ASC) accessory is required
for those types of heat pumps.
DO NOT CONNECT
HP7 or HP7R boards
Figure 7
Connecting Multiple Heat Pumps
Dry Contact Connection
Points to the Microprocessor
Figure 8
1. Choose one unit to be the lead (or master) unit. This is typically a
unit that can be accessed easily when temperature adjustments are
needed.
l
Note - The Lead unit can be connected to an external controller
via the "smart bus" connection point if desired.
2. Deactivate power to heat pumps.
3. Remove electrical access panels.
4. Route 22-gauge, 2-conductor, low-voltage wires to the low voltage
sides of the electrical enclosures. Follow all National Electric Codes
(NEC) and/or State and Local guidelines.
5. Connect the first slaved heat pump's wires to the unit selected as the
master heat pump's.
6. Use "Port C" on the microprocessors as indicated. Connecting the
"Y" to the "Y" and the "B" to the "B" on each heat pump's port "C"
connection point. The "G" and "R' connection points are not used. See
7. Connect any additional heat pumps as indicated, doubling up the wires as shown. See Figure 9. Confirm the same
color wires connect to the same wires on each heat pump ("Y" to "Y" and "B" to "B"). Up to 16 heat pumps can
be controlled by one heat pump.
8. Label the heat pumps appropriately as a master unit and slaved units (Master, Slaved 01, Slaved 02, etc.) to
simplify configuration and future operation.
9. Reattach access panels.
Multiple Heat Pump
Connection Points to "Port C"
Figure 9
10. Apply power to master heat pump. Confirm
the mode is set to "
SYSTEM OFF
".
11. Apply power to the next heat pump and
confirm the mode is set to "
SYSTEM
OFF
". Do this for each heat pump.
12. Program heat pumps with assigned
addresses.
1
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Ins
ta
lla
tion
Содержание GBB
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Страница 74: ...Page 70 l Follow all National Electric Codes NEC and or State and Local guidelines 3 Appendix...
Страница 75: ...Page 71 3 8 Schematics Some schematics have been provided in the appendix of this manual 3 Appendix...
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