INSTALLATION AND OPERATION MANUAL, GAS BOILERS,
MODELS CG-214(E), CG-314(E), CG-414(E), CG-220(E), CG-320(E), CG-325(E), CG-330(E)
PART NUMBER 10042R3
8
2005-12-19
3.0 SERVICE CONNECTIONS
PLUMBING CONNECTIONS
WARNING: Plumbing connections must comply with applicable
sanitary, safety, and plumbing codes.
WATER SUPPLY CONNECTION
The incoming cold water supply connection, at the rear of the steamer cabinet, requires 3/8"
tubing and water pressure of 25-50 psi. A manual shut-off valve must be provided convenient
to the appliance; this valve should be open when the boiler is in operation.
FAILURE OR MALFUNCTION OF THIS APPLIANCE DUE TO POOR WATER QUALITY IS
NOT COVERED UNDER WARRANTY. SEE WATER QUALITY STATEMENT, PAGE 4.
DRAIN CONNECTION
The drain (2" IPS) should be piped to a floor drain near the unit. There should be no solid drain
connection; an “open gap” between the boiler and the floor drain is required.
GAS CONNECTION
1. The data plate on the cabinet door of the boiler indicates the type of gas your unit is
equipped to burn. DO NOT connect to any other gas type.
Keep the appliance area free and clear from combustible substances. Do not obstruct the
flow of combustion and ventilation air.
2. A 3/4" NPT line is provided at the rear for the connection. Each boiler is equipped with an
internal pressure regulator which is set at 3.5" W.C. manifold pressure for natural gas or
10.5" W.C. for LP gas. Use the 1/8" pipe tap on the burner manifold for checking pressure.
An adequate gas supply is necessary. Undersized or low pressure lines will restrict the volume
of gas required for satisfactory performance. A steady supply pressure, between 7" W.C. and
14" W.C. for natural gas and 11" W.C. and 14" W.C. for propane gas is recommended. With all
units operating simultaneously, the manifold pressure on all units should not show any
appreciable drop. Fluctuations of more than 25% on natural gas, and 10% on propane gas, will
create pilot problems and affect burner operating characteristics.
