Johnson Controls SA PD 180 THRU 240 - Manual (Page 19)

430645-YIM-D-0610
Johnson Controls Unitary Products 19
M1 while sending a signal to one of the "CFAN" terminals on
DC.
• Relay RY1 controls the crankcase heater (CCH1). The
normally closed contacts allow CCH1 to operate during
unit shutdown.
• Contactor M1 controls compressor COMPR1.
The output signal from the remaining "CFAN" terminal on DC
closes the coil of contactor M3.
• Contactor M3 controls outdoor fans ODFAN1 & 2.
After completing the specified time for fan on-delay, UCB closes
the coil of relay BR1.
• Relay BR1 sends a 24V signal to G1 of terminal block
TB2. It may be used to control operation of an indoor
blower.
When the call for cooling (Y1) is satisfied, the UCB disables the
signal to RY1, M1 and DC as long as the specified minimum run
time (ASCD) has elapsed.
The UCB disables the signal to BR1 after completing the fan
off-delay period.
Dual Stage Heat Pump (PC120-240)
A two stage thermostat is required to operate the heat pump in
cooling mode.
The reversing valve is energized during cooling mode. A
continuous 24V signal is passed through the normally closed
contacts of relay RY2 to the "O" terminal of the Defrost Control
Board (DC). The normally closed relay DR-2 within DC
energizes the solenoid (SOL) of the reversing valve.
When the thermostat calls for first-stage cooling (Y1), the
Simplicity control board (UCB) closes the coils of relay RY1 and
contactor M1 while sending a signal to one of the "CFAN"
terminals on DC.
• Relay RY1 has two functions. 1) control the crankcase
heater CCH1, 2) control the 24V output signal to S1 on
terminal block TB2.
• Contactor M1 controls compressor COMPR1.
The output signal from the remaining "CFAN" terminal on DC
closes the coil of contactor M3.
• Contactor M3 controls all outdoor fans.
After completing the specified time for fan on-delay, UCB closes
the coil of relay BR1.
• Relay BR1 sends a 24V signal to G1 of terminal block
TB2. It may be used to control operation of an indoor
blower.
When the thermostat calls for second-stage cooling (Y2), the
Simplicity control board (UCB) closes the coil of relay RY2 and
contactor M2.
• Relay RY2 has two functions. 1) control the crankcase
heater CCH2, 2) control the 24V output signal to S2 on
terminal block TB2.
• Contactor M2 controls compressor COMPR2.
If the initial call for cooling requires both stages (Y1 and Y2), the
UCB will delay the second stage by 30 seconds to avoid an
excessive power inrush.
When the call for cooling (Y2) is satisfied, the UCB disables the
signal to RY2 and M2 as long as the specified minimum run
time (ASCD) has elapsed.
When the call for cooling (Y1) is satisfied, the UCB disables the
signal to RY1 and M1 as long as the specified minimum run
time (ASCD) has elapsed.
Dual Stage Heat Pump - 4 pipe (PD180-240)
A two stage thermostat is required to operate the heat pump in
cooling mode.
Both reversing valves are energized during cooling mode.
Continuous 24V signals are passed through the normally
closed contacts of relays RY2 and RY3 to the "O" terminals of
their respective Defrost Control Boards (DC1 and DC2). The
normally closed relays DR-2 within DC1 and DC2 energize the
solenoids (SOL1 and SOL2) of the reversing valves.
When the thermostat calls for first-stage cooling (Y1), the
Simplicity control board (UCB) closes the coils of relay RY1 and
contactor M1 while sending a signal to one of the "CFAN"
terminals on DC1.
• Relay RY1 has two functions. 1) control the crankcase
heater CCH1, 2) control the 24V output signal to S1 on
terminal block TB2.
• Contactor M1 controls compressor COMPR1.
The output signal from the remaining "CFAN" terminal on DC1
closes the coil of contactor M3.
• Contactor M3 controls outdoor fans ODFAN1 & 2.
After completing the specified time for fan on-delay, UCB closes
the coil of relay BR1.
• Relay BR1 sends a 24V signal to G1 of terminal block
TB2. It may be used to control operation of an indoor
blower.
When the thermostat calls for second-stage cooling (Y2), the
Simplicity control board (UCB) closes the coils of relay RY2 and
contactor M2 while sending a signal to one of the "CFAN"
terminals on DC2.
• Relay RY2 has two functions. 1) control the crankcase
heater CCH2, 2) control the 24V output signal to S2 on
terminal block TB2.
• Contactor M2 controls compressor COMPR2.
The output signal from the remaining "CFAN" terminal on DC2
closes the coil of contactor M4.