Generac 86640 - Manual (Page 58)

Section 4.5- OPTIONAL HEAT RECOVERY SYSTEM
General
Some IM (Industrial Mobile) engine-generators are
equipped with a heat recovery system. If desired, the cus­
tomer can use this system to provide heated air while working
in cold areas (such as a manhole).
Operation
Figure 1, below, is a schematic diagram of a heat recov­
ery system. Factory Installed components include (a) a heat
exchanger, fb) a control valve, (c) a thermostat, (d) the engine
radiator, and (e) interconnecting hoses and fittings. Operation
may be briefly described as follows;
1. Coolant from the engine flows through the heat exchanger
where it is heated by the engine exhaust, which also passes
through the heat exchanger.
2. From the heat exchanger, coolant flows to a control valve
(CV). The control valve can be positioned manually, as fol­
lows:
a. It can be actuated manually to direct coolant through a
customer-supplied remote heater and then to a thermostat
housing (TH).
b. It can be actuated manually to direct coolant to the
thermostat housing (TH) and not to the customer’s remote
heater.
3. The thermostat (TH) either delivers the coolant back to the
engine or to the unit radiator, as follows:
a. If coolant temperature Is less than 192’ F. (89’ C.),
additional cooling is not needed, and the coolant Is deliv­
ered back to the engine.
b. If coolant temperature is greater than 192’ F. (89’ C.),
additional cooling is needed, and the coolant is delivered
to the unit radiator and then back to the engine.
Customer Remote Heater
This heater is usually supplied by the user, in conjunction
with a fan or blower to extract the heat from the remote heater
and deliver it to the desired work area(s). The user must
ensure that the entire system has been properly filled with the
recommended coolant mixture prior to use.
Exploded View of Heat Recovery System
Figure 12 (next page) shows a typical heat recovery
system. Parts included in the drawing are iisted below.
ITEM DESCRIPTION
1 Exhaust Manifold
2 End Plate
3 Thermostat Hsng.
4 Thermostat
5 Gasket
6 Water Pump
7 Lockwasher
8 Hex Nut
9 Stud
10 Fitting
12 Pipe Plug
13 Gasket
14 Gasket
15 Gasket
16 Fitting
17 90* Fitting
18 Brass Fitting
19 Gasket
ITEM DESCRIPTION
20 Filler Neck
21 Radiator Cap
22 Exhaust Flange
23 Hose Clamp
24 Upper Hose
25 Lower Hose
26 Hose
27 Hose
28 Hose
29 Stud
30 Stud
31 Stud
32 Pipe Plug
34 Hose
35 Fitting
36 Hose Clamp
37 Lifting Lug
38 Lockwasher
Figure 11. Schematic Diagram- Engine Cooling and Heat Exchanger System
Page 4.5-1