Advanced Settings; Snow-Blowing Functions; Pre-Start Check - Carrier 38VMH072 Series Installation And Maintenance Instructions Manual

Advanced Settings

• Hold the "MENU (SW4)" button down for five seconds
to enter the menu.
• Press "UP(SW5) / DOWN(SW6)" button to select and
set the item. When the number is chosen, the number will
flash. Then press "OK(SW3)" to confirm and set the next
number. Use Table 19 below as reference.
• Hold "OK(SW3)" again to exit the main menu.
Table 19 — List of Menu Functions
SYMBOL FUNCTION
Special
function for
_n1_
debugging
Refrigerant
recycle
_n2_
function
Malfunction
_n3_
query
Night time
_n4_
setting
Silent mode
_n5_
setting
Static pressure
_n8_
mode setting
Temperature
_nb_
unit setting
T4 sensor
(outdoor
temperature)
threshold to
enable
Auxiliary Heat.
Aux heat will
_nC_
enable when
outdoor
temperature
falls 1.8 F
below this
temperature.
ITEM DESCRIPTION

Forced cooling (62.6 F
_n12
of IDU)

Forced heating (86 F of
_n13
IDU)
_n14 Cooling test
_n15 Heating Test
Refrigerant recycled to
_n21
outdoor units
Refrigerant recycled to
_n22
indoor units
Refrigerant recycled to
_n23
piping
_n26 Maintenance operation
Historical malfunction
_n31
query
Clear the historical mal-
_n32
function
_n41 6/10H (default)
_n42 6/12H
_n43 8/10H
_n44 8/12H
_n51 Night silent mode
_n52 Silent mode
_n53 Super silent mode
_n54 Silent mode off (default)
Standard static pressure
_n81
mode (default)
Low static pressure
_n82
mode (reserved)
Medium static pressure
_n83
mode (reserved)
High static pressure
_n84
mode (reserved)
Temperature unit
_nb1
(Celsius)
Temperature unit
_nb2
(Fahrenheit)
_nC1 Auxiliary heat disabled
°
_nC2 5 F
°
_nC3 15 F
°
_nC4 25 F
°
_nC5 35 F
°
_nC6 45 F
°
_nC7 55 F
°
_nC8 65 F
Snow-Blowing Function
1. Press SW5 button on spot check box of the header
outdoor unit to enter the snow-blowing function. It will
display "Sn0" for 15 seconds.
2. Press SW5 button again to exit the snow-blowing
function. It will display "Sn1" for 15 seconds.
The snow-blowing modes can be selected through S11 dip
switch on spot check box as shown in Fig. 42..
Mode
S11
Fig. 42 —S11 - Snow-Blowing Modes
If the unit receives a startup signal, it will exit the snow-
blowing function.

Pre-Start Check

• Check that the refrigerant pipe line and communication
wire with indoor and outdoor unit have been connected
to the same refrigeration system.
• Outdoor units require either 208/230-3-60 or 460-3-60
power. Verify that the power and phase requirements are
correct and all three legs are present.
• Check that power source's voltage is within 10% of the
rated voltage.
• Check and confirm that the power and control wire are
correctly connected.
• Check that the wired controllers are properly connected.
• Before powering on, confirm there is no short circuit for
each line.
• Check that all units have passed a nitrogen pressure test
for 24 hours.
• Provide the customer accurate "as-built" drawings and
documents, including actual piping lengths and
locations, unit addresses, settings, etc.
• Ensure additional refrigerant charge calculations are
correct, and that the system is charged accordingly.
• Energize outdoor units for at least 24 hours before
startup to ensure proper oil temperature.
• Ensure all refrigerant valves on outdoor units are fully
open. Ensure oil balancing valves are open for 2 and 3-
module systems. If these valves are not fully open,
equipment damage may occur.
25
Heavy Snow Light Snow
Mode Mode