Installation, Operation and Maintenance Manual
Page
65
of
100
6.
The thermostatic expansion valve bulb must be installed in the same location and same orientation is
extremely important to the proper performance of the system.
NOTICE
. The area should be vented thoroughly to prevent formation of
dangerous fumes which could result from the refrigerant in the presence of an
open flame.
7.
Braze the replacement valve in place using Sil-Fos or equivalent silver copper phosphorus composition
brazing material.
8.
Use a damp cloth covering the thermostatic expansion valve as a precaution will prevent overheating the
valve body which could damage the superheat spring and result in flood back problems.
9.
Braze the replacement thermostatic expansion valve to the connecting lines.
10.
If when brazing a brass refrigerant distributor to the valve, braze with Sil-Fos or equivalent silver copper
phosphorus composition brazing material. No soldering allowed.
11.
Direct the flame away from the thermostatic expansion valve body and avoid excessive heat on the
diaphragm. As an extra precaution, a wet cloth may be wrapped around the body and element during
brazing operation.
12.
Evacuate and charge the system with the specified quantity of refrigerant.
13.
Adjust refrigerant level as needed.
14.
Check compressor suction and discharge pressure.
15.
Check sub cooling and super heat values.
16.
If adjustment is necessary on the thermostatic expansion valve, always tighten the adjusting stem packing
nut and replace the seal cap tightly.
7.18.5
Refrigerant Liquid Line Solenoid Valve (LLSV) Replacement
Remove the Solenoid Valve:
1.
Disconnect all remote electric power sources to the unit.
2.
Remove all compressor and fan motor fuses for safety reasons. Remember to replace after finish with
change out.
3.
Use lock-out tag-out protection.
4.
Wear protective goggles and wear required. System contains oil and refrigerant under pressure.
5.
Remove and reclaim all refrigerant per your local codes.
6.
Check the replacement solenoid valve is the same manufacture, model or part number and configuration
as the original part.
7.
Note the direction of flow is indicated by an arrow or the word IN
on the inlet of the valve body.
8.
Disconnect all electrical wires from the solenoid valve. Check for wear or damage to the wires. Repair or
change out as needed.
