5
SYSTEM 2000 CONTROLLERS - GAS/ELECTRIC 101ASSB
Fused
24V AC
Damper
Transformer
1
7
6
TR2 TR1
S Y
W Rd B
G
TB1
DAISY CHAIN
UP TO 20
ZONES
101ASSB
System Controller
TC2 TC1
3
2
ZONE
DAMPER
W Y G Rd B
W2
W Y R C
RC
W2
MC RO
Open
Close
DAMPER MOTORS
TB2
TB1
W Y R C
ZONE
THERMOSTAT
DAMPER RELAY
BOARD (P/N 101ARLY)
W1
Y1
R
G
TB2
TO CAPACITY CONTROLLER
AND HVAC UNIT (PG 28)
4
5
WIRING
If the heater does not turn on the
blower fan, a blower fan relay must be
installed. See page 43.
24V damper transformer. Requires in-line
fuse. See table on page 42 for sizing trans-
former and fuse.
Refer to page 41 for Five Wire Link wire
sizing.
C terminal for hard wired electronic
thermostats only.
Open motor not utilized on low pressure
(spring open) dampers.
If using more than one damper per
thermostat, refer to Slaving Zone
Dampers section, page 23 and 44.
Do not remove factory installed jumper
between TC1 and TC2. TC1 and TC2 are
used for Select-Temp Zoning System only.
When using the 101ASSB controller in a
heat pump application which utilizes G/E
terminals, a fan relay must be installed,
see page 43.
1
2
3
4
5
6
7
8
Overview
The 101AACBHP Heat Pump Controller greatly simplifies coordination of
single stage or two stage Heat Pumps with dampered zone systems. The
Controller communicates to the zone dampers through a five wire link.
These five wires are daisy chained to each zone damper. This simple
patented wiring process eliminates home run wiring. The 101AACBHP
has a built-in capacity control system which uses an LAS (included with
the Controller) for capacity control. Refer to the section on Capacity
Control LAS for more information.
Operation
The Controller operates the Heat Pump using signals from each zone
thermostat in the system. When heating or cooling calls are sent to the
controller, it treats these calls as votes. If the majority of calls are for
cooling, the Controller will operate in the cool mode. The Heat Pump
will continue to operate in the cool mode until the majority of calls shift
to heating or all cooling calls are satisfied. If the majority of calls are for
heating, the Controller will operate in the heat mode. The Heat Pump
will continue to operate in the heat mode until the majority of calls shift
to cooling or all heating calls are satisfied.
*The reversing valve is energized depending on the O/B
jumper setting.
Second stage operation is based on the leaving air temperature of the unit.
The LAS reports the discharge temperature to the Controller. Three
minutes after initiating cooling, the Controller checks the LAS. If the
discharge temperature is above 52 degrees, the second stage is turned
on. Three minutes after initiating heating, the Controller checks the
LAS. If the discharge temperature is below 114 degrees, the second
stage is turned on.
The Heat Pump Controller is also set up to operate electric strip heat in
the Heat Pump. The Controller monitors the air temperature leaving the
Heat Pump coil. When there is a call for heat and the air leaving the coil
is not above 85 degrees, the electric strip will turn on after an eight minute
delay. This operation can be modified, if desired by an outdoor thermostat.
The Heat Pump Controller simplifies system wiring. The Controller
terminals connect directly to the Heat Pump terminal strip. (
Heat Pump
thermostats are not used for this system
). Relays, timers and other
miscellaneous controls are not required.
SYSTEM 2000 CONTROLLERS – HEAT PUMP 101AACBHP
