Generac
®
Power Systems, Inc.
9
Section 1 — General Information
Generac Liquid-cooled 20 kW Generator
4. Remove pipe plug from Port 2.
5. Install brass hose fitting into Port 2.
6. Install pipe plug into Port 1.
7. Connect carburetor gas hose to brass fitting.
8. Tighten all clamps and plugs.
9. Make sure fuel supply is of the proper pressure
and type for configuration.
10. Reverse the procedure to convert back to natural
gas.
Figure 1.10 — Reconfigure the Fuel System
NOTE:
Port 1 is for NG only and Port 2 is for LP vapor
only. No provision for dual fuel has been made.
Serious injury or damage may occur if not
configured properly. Please consult an author-
ized Generac Service Dealer with any ques-
tions.
1.18 TORQUE SPECIFICATIONS
Cylinder Head ............................................15 (+ 90° + 90°) ft.lb.
Intake Manifold ................................................................13 ft.lb.
Exhaust Manifold..............................................................13 ft.lb.
1.19 ENGINE OIL RECOMMENDATIONS
The unit has been filled with 15W-40 engine oil at the
factory. Use a high-quality detergent oil classified “For
Service CC, SD, SE, SF.” Detergent oils keep the
engine cleaner and reduce carbon deposits. Use oil
having the following SAE viscosity rating, based on
the ambient temperature range anticipated before the
next oil change:
Any attempt to crank or start the engine
before it has been properly serviced with the
recommended oil may result in an engine fail-
ure.
1.20 COOLANT RECOMMENDATIONS
Use a mixture of half low silicate ethylene glycol base
anti-freeze and half deionized water. Cooling system
capacity is about 8 U.S. quarts (7.6 liters). Use only
deionized water and only low silicate anti-freeze. If
desired, add a high quality rust inhibitor to the rec-
ommended coolant mixture. When adding coolant,
always add the recommended 50-50 mixture.
Do not use any chromate base rust inhibitor
with ethylene glycol base anti-freeze or
chromiumhydroxide (“green slime”) forms and
will cause overheating. Engines that have
been operated with a chromate base rust
inhibitor must be chemically cleaned before
adding ethylene glycol base anti-freeze. Using
any high silicate anti-freeze boosters or addi-
tives will also cause overheating. DO NOT use
any soluble oil inhibitor for this equipment.
1.21 BEFORE INSTALLATION
Before installing this equipment, check the ratings of
both the generator and the transfer switch. Read
“Emergency Isolation Method” and “Total Circuit
Isolation Method” in Section 2.5 and 2.6, or in the
installation manual (Part No. 079699).
The generator’s rated wattage/amperage capacity
must be adequate to handle all electrical loads that
the unit will power. If necessary, group the critical
(essential) loads together and wire them into a sepa-
rate “emergency” distribution panel.
This generator can be installed in conjunction with a
standard Generac “GTS” type transfer switch, if nec-
essary.
The standard transfer switch has no sensing or con-
trolling circuit boards. Instead, the generator control
console controls all phases of operation, including
engine start up and load transfer.
!
!
!
DANGER
NG FUEL SYSTEM
LP FUEL SYSTEM
Port 1
Port 2
FUEL HOSE
BRASS HOSE
FITTING
HOUSING
PORTS
OUT
PORT 2
PLUG
FUEL HOSE
BRASS HOSE
FITTING
HOUSING
PORTS
PLUG
OUT
PORT 1
Temperature
Oil Grade (Recommended)
Above 80° F (27° C)
SAE 30W or 15W-40
32° to 80° F (-1° to 27° C)
SAE 20W-20 or 15W-40
Below 32° F (0° C)
SAE 10W or 15W-40
