23
Finned copper tube gas boilers & water heaters – Boiler manual
FTXLF-IOM-HN-1-110308 Copyright 2008 Mestek, Inc.
A ground joint union should be installed between the boiler gas
controls and the supply piping. Each of these items are needed to
ensure long life and ease of servicing. Always use a pipe sealant that
is suitable for use with LP gas.
Always use a wrench on the gas valve body when
making gas connections to it. Never over-tighten the
piping entering the gas valve body or gas valve failure
may result!
When applicable, provisions for vent, bleed and gas relief lines must
be made in accordance with the latest revision of ANSI Z223.1/
NFPA 54. The main Dungs gas valve supplied with boiler/water
heater does not require external venting.
Safe lighting and other performance criteria were met with the gas
manifold and control assembly provided on the boiler. All gas con-
nections MUST be leak tested before putting the boiler into opera-
tion.
Never use an open flame to test for gas leaks. Always use
an approved leak detection method. Failure to comply
with this warning can cause extensive property damage,
severe personal injury or death!
Whenever the gas supply piping is pressure tested the boiler/water
heater gas controls must be protected. If the test pressure is equal
to, or less than 1/2 psig, 3.5 kPa isolate the boiler/water heater by
closing it’s manual shut off valve, see Figure 16, page 22. If the test
pressure is greater than, or equal to 1/2 psig, 3.5 kPa, disconnect the
boiler/water heater and its individual shut-off valve.
Equivalent length (feet) for typical fittings
table 11
Pipe
size
Fitting or valve
90
o
elbow
Tee
(branch flow)
Gate
valve
Gas
cock
2"
5.2
10.3
1.2
3.0
2½"
6.2
12.3
1.4
3.5
3"
7.7
15.3
1.8
4.5
4"
10.1
20.2
2.4
6.0
5"
12.6
25.2
2.9
7.3
6"
15.2
30.4
3.5
13.4
Equivalent lengths above are for threaded fittings. Multiply values above by
0.75 for flanged fittings.
eLectricAL WirinG
electrical power connections
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation!
Verify proper operation after servicing.
Failure to comply could result in severe personal injury,
death or substantial property damage.
The electrical connections to this boiler/water
heater must be made in accordance with all
applicable local codes and the latest revision
of the National Electrical Code, ANSI/
NFPA-70. Installation should also conform with CSA
C22.1 Canadian Electrical Code Part I if installed in
Canada.
Install a separate 240 volt 30 amp circuit breaker for the boiler/wa-
ter heater and pump. See Table 12. A properly rated shut-off switch
should be located at the boiler/water heater. The boiler/water heater
must be grounded in accordance with the authority having jurisdic-
tion, or if none, the latest revision of the National Electrical Code,
ANSI/NFPA-70.
Futera xLF Electrical Requirements
table 12
Futera xLF
Model
Required
Circuit Breaker
(amps)
Running
Amps *
3000
25
20
4000
25
20
* use separate circuit breaker that is properly sized for pump
and pump contactor.
Line voltage field wiring of any controls or other devices
must conform to the temperature limitation of type T wire
at 95
o
F, 35
o
C above room temperature. Use copper conductors
with a minimum size of #14 awg. Use appropriate wiring materials
for units installed outdoors. The wire size must be compatible with
the total amp draw of the circuit.
Refer to the wiring diagram supplied with the boiler/water heater for
proper wiring connections.
