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THERMOSTATIC MIXING VALVE
Thermostatic Mixing Valve (TMV) Inspection – This device has no user-serviceable or repairable
components. Refer to Section 5, for further details on this device. If it fails to maintain adequate
compressor discharge temperature, replace it as follows:
1.
Be sure the unit is completely off and that no air pressure is in the oil reservoir and in the air cooled
after cooler. Close the service valve.
2.
Disconnect lockout and tagout the power supply to the starter.
3.
Remove the spring retainer holding the TMV assembly cover in place in the manifold block. Remove
the cover, its gasket, the TMV body and its spring from the compressor housing.
4.
Inspect the valve seat surfaces for damage or foreign matter. Note its setting temperature, it is
stamped on the valve seat area.
5.
Immerse the valve body in a bath of compressor oil; heat the oil slowly and note the temperatures at
which seat first starts moving and at it finally stops moving. Replace the device if one of the
following conditions is present:
a. The stamped setting on the valve seat is not correct. The standard compressor package should
be fitted with the 158ºF (70ºC) (opening temperature) element, unless by consultation with
Gardner Denver, it has been approved to use the 181ºF (98ºC) (opening temperature) element
instead.
b. The seat fails to stroke fully at the correct temperature.
6.
Assemble the TMV assembly into the housing in the reverse order.
7.
Run the unit and check for leaks.
INPUT SHAFT SEAL ASSEMBLY
Input Shaft Seal Maintenance – This device has no user-serviceable or repairable components. If oil
leaks past its seal and unto the external portion of the shaft, contact Gardner Denver to have it inspected
and/or repaired by a trained mechanic.
Figure 9-4 Thermostatic Mixing Valve
13-25-629 v03
Page 60
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