48TC
5.Finned surfaces should remain wet with cleaning solution for 10 minutes.
6.Ensure surfaces are not allowed to dry before rinsing. Reapply cleaner as needed to ensure
7.Thoroghly rinse all surfaces with low velocity clean water using downward rinsing motion of water spray nozzle. Protect fins from damage from the spray nozzle.
Evaporator Coil Metering Devices
The metering devices are multiple
To check for possible blockage of one or more of these metering devices, disconnect the supply fan contactor (IFC) coil, then start the compressor and observe the frosting pattern on the face of the evaporator coil. A frost pattern should develop uniformly across the face of the coil starting at each horizontal header tube. Failure to develop frost at an outlet tube can indicate a plugged or a missing orifice.
Refrigerant System Pressure Access Ports
There are two access ports in the system - on the suction tube near the compressor and on the discharge tube near the compressor. These are brass fittings with black plastic caps. The hose connection fittings are standard 1/4 SAE male flare couplings.
The brass fittings are
PURONR (R-410A) REFRIGERANT
This unit is designed for use with Puron
Puron
Because Puron
Refrigerant Charge
Amount of refrigerant charge is listed on the unit’s nameplate. Refer to Carrier
Unit panels must be in place when unit is operating during the charging procedure. To prepare the unit for charge adjustment.
No Charge
Use standard evacuating techniques. After evacuating system, weigh in the specified amount of refrigerant.
Low-Charge Cooling
Using Cooling Charging Charts (Figs. 10, 11, 12, and 13), vary refrigerant until the conditions of the appropriate chart are met. Note the charging charts are different from the type normally used. Charts are based on charging the units to the correct superheat for the various operating conditions. Accurate pressure gauge and temperature sensing device are required. Connect the pressure gauge to the service port on the suction line. Mount the temperature sensing device on the suction line and insulate it so that outdoor ambient temperature does not affect the reading.
To Use Cooling Charging Charts
Select the appropriate unit charging chart from Figs. 10, 11, 12, and 13.
SSizes D08 and D12 each have one cooling charging chart
S Size D14 has two cooling charging charts: Circuit A and Circuit B
Take the outdoor ambient temperature and read the suction pressure gauge. Refer to chart to determine what suction temperature should be. If suction temperature is high, add refrigerant. If suction temperature is low, carefully recover some of the charge. Recheck the suction pressure as charge is adjusted.
For D14 size, perform this procedure once for Circuit A (using the Circuit A chart) and once for Circuit B (using the Circuit B chart).
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