Control wiring
Remote mode selection: SC-H
For remote mode selection, either for cooling or heating, connect a contact between terminals 86
and 80F. You must also activate remote mode selection on the HMI when necessary.
Remote mode selection: SC&H
For remote mode selection for simultaneous cooling and heating, connect a contact between
terminals 84 and 80D. You must also activiate remote mode selection on the HMI when necessary.
Remote start or stop: SRS
Connect a remote switch to terminals 87 and 80G to provide remote start or stop control, if
required. You must also activiate remote mode selection on the HMI.
Remote interlock: SEI
Connect a remote switch to terminals 88 and 80H to provide remote interlock, if required. Connect a
jumper to terminals 88 and 80H if no remote interlock switch is connected by customer.
Note: Changing operation mode requires the user to stop the unit.
Cold-water flow switch: SFM1
Connect the cold-water flow switch SFM1 for each module to terminals 92 and 80K of XT2. For all
PJP models, SFM1 is installed and wired in the factory by default. For all PJS models, SFM1 must be
installed and wired in the field.
Hot-water flow switch: SFM2
Connect the module hot-water flow switch SFM2 to terminals 93 and 80L of XT2. SFM2 isn’t required
for any PJP models. SFM2 must be installed and wired in the field for all PJS models.
Liquid pump starter contacts
Use terminals TB1:1-2 (DO1-E) of the relay board (ARB) to control the cold-water pump, and use
terminals TB3:1-2 (DO3-E) of the ARB to control the hot-water pump. The voltage of free contacts
are 115 VAC. Four-pipe units need to connect both the cold-water and hot-water pumps. The two-
pipe units only need to connect the pump for one water loop with DO1-E.
Water valve control contacts
Use terminals TB2:1-2 (DO2-E) of the ARB to control the cold-water valve, and use terminals TB4:1-2
(DO4-E) of the ARB to control the hot-water valve. The voltage of free contacts are 115 VAC. Four-
pipe units need to connect both cold-water and hot-water valves. The two-pipe units only need to
connect one water valve with DO2-E.
Inlet and outlet pipe heater of cold water BPHE: EPH11 and EPH12
The active contact for the inlet and outlet pipe heater of the cold-water BPHE is on terminals
76B-2B. For 0035PJP models, the wiring for the heater in the control panel is completed in factoy.
Inlet pipe heater of cold-water hydro kit: EPH13
The active contact for the cold-water pump control is on terminals 76C-2C in the control panel. The
wiring between the hydro kit and the control panel must be completed in the field, except for hydro
kit combined with units.
Outlet pipe heater of cold-water hydro kit: EPH14
The active contact for the cold-water pump control is on terminals 76D-2D in the control panel.
The wiring between the hydro kit and the control panel is completed in the factory, and the heater
(EPH14) is only for 0035PJP models,which is combined with the hydro kit. This can also be reserved
for customers who need to install a heater on the outlet pipe of the cold-water hydro kit.
61YMAE Air-Cooled Inverter Scroll Chiller and Heat Pump
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