Lochinvar COPPER-FIN II CF-1261, Designer'S Manual

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L o c h i n v a r
D E S I G N E R
’
S G U I D E C O P P E R
-
F I N I I W A T E R H E A T E R
6 1 5 - 8 8 9 - 8 9 0 0
1 9
WATER VELOCITY CONTROL
IMPORTANT
To ensure proper velocity through the
heat exchanger, it is necessary to regulate the
temperature rise across the heat exchanger
from inlet to outlet. (This
must be done on
initial installation and periodically rechecked).
With the correct temperature rise across the
heat exchanger (See TABLE L), you may be
assured of the proper velocity in the tubes
and long life and economical operation from
the water heater.
PUMP OPERATION
The water heater MUST be connected
with a properly sized and installed,
intermittent operating, all bronze pump
that circulates water between heater
and storage tank.
The pump is sized to heater input and
water hardness. Should water hardness
exceed 25 grains/350 TDS, consult
factory for pump sizing.
The pump chart (Table M) is based on the
following fittings:
6-90° elbows 2 ball valves
2 unions 1 cold water supply tee
Due to pump capacity the following
specifications cannot be exceeded
when using the standard pump:
• Not more than 45 feet of straight pipe.
• For every elbow and tee in excess of
those shown above, DEDUCT 5 FEET
from maximum allowable straight pipe
in heater-to-tank circulating loop.
WATER TREATMENT
In hard water areas, water treatment
should be used to reduce introduction
of minerals into the system. Minerals
in the water can collect in the heat
exchanger tubes causing noise and
inefficient operation. Excessive build-up
of materials in the heat exchanger can
cause a non-warrantable failure.
NOTE:
Care should be taken to
measure temperature
rise and maintain proper
water velocity in the
heat exchanger.
(TABLE L) - REQUIRED TEMPERATURE RISE
MODEL NUMBER TEMPERATURE RISE °F
CF401 12
CF501 15
CF651 20
CF751 23
CF991 19
CF1261 24
CF1441 27
CF1801 34
CF2071 39
(TABLE M) – REQUIRED PUMP
PERFORMANCE FOR WATER HARDNESS
OF 5 TO 25 GRAINS
MODEL GPM FT. HD AMP DRAW HORSE VOLTAGE/
POWER PHASE
CF401-751 55 10 5.8 1/4 120/1
CF991-2071 90 15 7.4 1/2 120/1
NOTE:
A larger pump must be
utilized in situations
where the distance
between the water
heater and tank exceed
those specified.
1.
2.
NOTE:
If a pressure reducing
valve or check valve is
in the system a properly
sized expansion tank
may be required.