Maintenance
Drain Coolant
To avoid burns, do not perform maintenance on
the coolant system until the coolant system has
reached ambient temperature.
Drain coolant from the engine and proportioner
coolant loops once a year or if the coolantlines need
to be disconnected, in orderto install a wall between
the generator and proportioner.
1. Perform Shutdown, page 63.
2. Remove the cabinet door from the front of the
proportioner.
3. Turn on manual valve switch (MV), located on
the load center (LC), to manually open the A
and B heat exchangercontrol valves and bypass
control valve.
Note
The battery must be connected to
operate valves. The load cente r (LC)
LEDs will stay on when the manualvalve
switch (MV) is in the ON position.
LC MV
Figure 40
LED Component LED Color
Manualvalveswitch(MV) Red
A Side Control Valve Red
B Side Control Valve Blue
Bypass Valve Green
4. To drain proportioner coolantloop:
a. Remove the proportioner coolant loopfill
bottle (HF) cap.
b. Place the other end of the drain tube ina
waste container. Open the drain valve. Drain
coolant until coolant is no longervisible in
the sight glass.
Proportioner CoolantLoop Drain Valve
Figure 41
c. To refill coolant loop, see
Refill ProportionerCoolant Loop, page 70.
5. To drain proportioner coolant loop from filter
housing. Only available on Series B systems.
a. Remove the proportioner coolant loop fill
bottle cap (HF).

D

H

T

HF

Filter Housing Drain Valve (D)
Figure 42
b. Place the other end of the filterhousing drain
tube (T) ina waste container. Open the drain
valve (D).
c. To refill coolant loop, see
Refill Engine CoolantLoop, page 72.
3A1705J 69