Dual Fuel Supplemental Manual
4
The Crest Dual Fuel - How it works...
1. Propane gas connection
The propane gas connection pipe is a threaded black iron pipe
connection. This pipe should be connected to the incoming gas
supply to deliver propane gas to the boiler.
2. Natural gas connection
The natural gas connection pipe is a threaded black iron pipe
connection. This pipe should be connected to the incoming gas
supply to deliver natural gas to the boiler.
3. Fuel selection switch
Switches the unit between natural and propane gas.
4. Natural gas indicator light (green)
Indicates that natural gas operation has been selected.
5. Propane gas indicator light (red)
Indicates that propane gas operation has been selected.
6. Small natural gas valve (Valve 1 Natural)
The small natural gas valve senses the negative pressure
created by the blowers, allowing gas to flow only if the gas
valves are powered and combustion air is flowing.
7. Small propane valve (Valve 1 Propane)
The small propane gas valve senses the negative pressure
created by the blowers, allowing gas to flow only if the gas
valves are powered and combustion air is flowing.
8. Large natural gas valve (Valve 2 Natural)
The large natural gas valve senses the negative pressure created
by the blowers, allowing gas to flow only if the gas valves are
powered and combustion air is flowing.
9. Large propane gas valve (Valve 2 Propane)
The large propane gas valve senses the negative pressure created
by the blowers, allowing gas to flow only if the gas valves are powered
and combustion air is flowing.
10. Natural shutoff valve
The natural shutoff valve is used to isolate the boiler gas
train from the gas supply.
11. Propane shutoff valve
The propane shutoff valve is used to isolate the boiler gas
train from the gas supply.
12. Natural ball valve (Valve 1)
The ball valve for natural valve 1 is used to isolate natural valve 1
from the propane gas supply.
13. Propane ball valve (Valve 1)
The ball valve for propane valve 1 is used to isolate propane valve 1
from the natural gas supply.
14. Natural ball valve (Valve 2)
The ball valve for natural valve 2 is used to isolate natural valve 2
from the propane gas supply.
15. Propane ball valve (Valve 2)
The ball valve for propane valve 2 is used to isolate propane valve 2
from the natural gas supply.
16. Proof of closure valve
An additional safety shutoff valve with proof of closure contacts is
used on the Crest 6.0 model only.
IMG00061
14
11
10
8
9
15
12
6
7
13
IMG00064
3
4
5
IMG00555
MODELS 4.0 - 5.0
MODELS 2.5 - 3.5
3
4
5
16
MODEL 6.0
Models FBD 2.5 - 6.0
IMG00062
1
2
Front View
Left Side (inside unit)
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