Service manual

44TD 204
Flow control washer flat side up
Service Stem Valves
When closing the service stem valves to remove your gauge and
manifold set always close the high side stem valve first. Following
this procedure will allow the system to “PULL” the refrigerant vapor
from your manifold set to reduce refrigerant loss. When the pressure
has been reduced, close the low side stem valve.
Thermostatic Expansion Valves
The following suggestions for diagnosis of automatic Thermostatic
Expansion Valve (TXV) are given with the understanding the fol-
lowing have been checked and are correct and/or have been cor-
rected prior to proceeding.
1. The condenser and fan blade are clean and have prop-
er operating conditions.
2. Water supply to the product is correct and flow over
the evaporator is correct.
3. Cuber refrigerant charge is correct.
4. TXV sensing bulb is properly located and secured to
the suction line and correctly insulated.
5. Hot gas valve(s) are not leaking and/or weeping
through.