MECHANICAL INSTALLATION — REMOTE RADIATOR COOLING
Remote Radiator Cooling (optional)
Remote radiator cooling substitutes a remote mounted radiator and an electrically driven fan for the set mounted components (see Figure 27 on next page). Removal of the radiator and the fan from the set reduces noise levels without forcing dependence on a continuous cooling water supply. The remote radiator installation must be completely protected against freezing conditions.
Application of a remote radiator to cool the engine requires proper design. Consider the following:
It is recommended that the radiator and fan be sized on the basis of a maximum radiator top tank temperature of 200°F (93°C) and a 115% cooling capacity to allow for fouling. Refer to the heat rejected to coolant and coolant flow rate specifications in Table 27 beginning on page 88 for radiator sizing.
The capacity of the radiator top tank or auxiliary tank must be equivalent to at least 15% of the total volume of coolant in the system to provide a coolant "drawdown capacity" (10%) and space for thermal expansion (5%). Drawdown capacity is the volume of coolant that can be lost by slow, undetected leaks and the normal relieving of the pressure cap before air is drawn into the coolant pump. Space for thermal expansion is created by the fill neck when a cold system is being filled.
To reduce radiator fin fouling, radiators have a more open fin spacing (nine fins or less per inch) should be considered for dirty environments.
Coolant friction head external to the engine (pressure loss due to pipe, fitting, and radiator friction) and coolant static head (height of liquid column measured from crankshaft center line) must not exceed the maximum allowable values on the genset specification sheet.
Radiator hose 6 to 18 inches (152 to 457 mm) long, complying with SAE 20R1, or equivalent standards, should be used to connect coolant piping to the engine to absorb genset movement and vibration.
It is highly recommended that the radiator hoses be clamped with two premium grade
A coolant drain valve should be located at the lowest part of the system.
Depending on the amount of coolant in the system, ball or gate valves are recommended. Globe valves are too restrictive. This will isolate the engine so the entire system does not have to be drained before servicing the engine.
To obtain the net power available from the genset, add the fan load indicated on the genset specification sheet to the power rating of the set and subtract the power consumed by the remote radiator fan, ventilating fans, coolant pumps, and other accessories required for the genset to run.
Excessive coolant static head
(pressure) can cause the coolant
NOTEpump shaft seal to leak. Excessive coolant friction head (pressure loss) will result in insufficient engine cooling.
PAGE 64 — INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07)
