21
Automatic Chemical Feeders
All chemicals must be completely diluted into the water
before being circulated through the heater. High chemical
concentrations will result when the pump is not running
(e.g. overnight).
A
A
CAUTION:
Combustion air must not be contaminated
by corrosive chemical fumes which can damage the
heater and void warranty.
A
A
CAUTION:
High chemical concentrations from
feeders that are out of adjustment will cause rapid
corrosion to the heat exchanger. Such damage is not
covered under the warranty.
CAUTI
ON: Failure of a heat exchanger due to lime
scale build-up on the heating surface, low pH, or other
chemical imbalance is not covered under the warranty.
Gas Supply
A
A
DANGER:
Make sure the gas on which the heater will
operate is the same type as specified on the heater’s
rating plate.
A
A
CAUTION:
Fuel grades of other than HD-5 Propane or
Natural Gas (980-1080 BTU/ft
3
) will require adjustments,
please contact the factory.
A pounds-to-inches regulator of the lock-up type must be
installed to reduce the gas supply pressure if it is higher
than 10.5" WC for natural gas or 13" WC for propane gas.
This regulator should be installed following the regulator
manufacturers instructions refer to
Table M
for maximum
pipe lengths.
Gas Supply Connection
A manual shut-off valve located outside the heater jacket
is required to be field supplied.
A
A
CAUTION:
The heater must be disconnected from
the gas supply during any pressure testing of the gas
supply system at test pressures in excess of 1/2 psi
(3.45 kPa).
The heater must be isolated from the gas supply piping
system by closing the upstream manual shut-off valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 psi
(3.45 kPa). Relieve test pressure in the gas supply line
prior to re-connecting the heater and its manual shut-off
valve to the gas supply line.
FAILURE TO FOLLOW THIS
PROCEDURE MAY DAMAGE THE GAS VALVE
. Over-
pressurized gas valves are not covered by warranty. The
heater and its gas connections shall be leak-tested before
placing the appliance in operation. Use soapy water for
leak test. DO NOT use an open flame.
F10660
GAS SUPPLY
CONNECTION
Figure 23. Gas Supply Connection
A
A
CAUTION:
Only sealant tape or a pipe compound
rated for use with natural and propane gases is
recommended. Apply sparingly only on male pipe ends,
leaving the two end threads bare.
MODEL
NO.
1-1/4" NPT
1-1/4" NPT
1-1/2" NPT
2" NPT
N
P
N
P
N
P
N
P
300B
45 (15)
150 (46)
175 (53)
550 (168)
350 (107)
1100 (335)
400B
25 (8)
80 (24)
100 (30)
375 (114)
200 (61)
650 (198)
500B
15 (5)
40 (12)
65 (20)
250 (76)
150 (46)
450 (137)
650B
40 (12
150 (46)
85 (26)
300 (91)
300 (91)
850 (259)
800B
30 (9)
90 (27)
60 (18)
200 (60)
200 (60)
600 (182)
1000B
20 (6)
50 (15)
40 (12)
150 (46)
125 (38)
450 (137)
N = Natural gas and P = Propane gas
Natural gas - 1,000 btu/ft
3
, 0.60 specific gravity at 0.5" W.C. pressure drop / Propane gas - 2,500 btu/ft
3
, 1.53 specific gravity at 0.6" W.C.
pressure drop
Lengths based on Sched 40 BIP - for other materials consult local codes
Elbows as 10 ft equivalent pipe length
Table M.
Gas Supply Piping (Sched 40 BIP) (ft./m)
Содержание Xfiire 1000B
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