Cooling Operation; Heating Operation; Emergency Operation - Midea MRCT-075CWN1-D(C) Technical & Service Manual

MCAC-RTT6S-201701 Midea R410A Tropical ClimaCreator Series Rooftop Package 220V 3Ph 60Hz
Step 2: Move FAN switch to ON position. The fan of unit will begin to operate.
Step 3: Move FAN switch to AUTO position. The fan of unit will operate according to the setting
of system immediately.

2) Cooling operation:

Step 1: Move SYSTEM switch to COOL position to select cool mode.
Step 2: Press to adjust the wired controller setting below room temperature. The fan of indoor
side should come on immediately on high speed, followed by cold air circulation. The display
should show STG1.
Step 3: Adjust temperature setting to 2° C below room temperature. The second stage cooling
should begin to operate and display should show STG1+2.
Step 4: Press to adjust the temperature setting above room temperature. The cooling system
should stop operating.
3) Heating operation (Only for heat pump unit):
Step 1: Move SYSTEM switch to heat mode. If the auxiliary heating system has a standing pilot,
be sure to light it.
Step 2: Press to adjust the wired controller setting to 1° C above room temperature. The heating
system should begin to operate. The display should show STG1. However, if the set point
temperature display is flashing, the compressor lockout feature is operating.
Step 3: Adjust temperature setting to 3° C above room temperature. If the system configuration is
set at MS2, HP2 or HP1, the auxiliary heat system should begin to operate and the display
should show STG1+2.
Step 4: Press to adjust the wired controller below room temperature. The heating system should
stop operating.
4) Emergency operation (Only for heat pump unit)
EMER by passed the heat pump to use the heat source wired to terminal E on the wired
controller. EMER is typically used when compressor operations is not desired, or prefer back-up
heat only.
Step 1: Press SYSTEM switch to select heat mode, then press EMER key. EMER will show on
the display.
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