L o c h i n v a r
D E S I G N E R
’
S
G U I D E
P O W E R
-
F I N
W A T E R
H E A T E R
6 1 5 - 8 8 9 - 8 9 0 0
1 9
Lochinvar
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 J) 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.
Acceptable Water Quality Levels
Maximum Water Hardness = 25 Grains
Minimum Water Hardness = 5 Grains
Maximum Total Dissolved Solids = 350 PPM
Range of Acceptable pH = 7.2 to 7.8
Standard production Lochinvar water heaters
are designed to operate free of impurity
build-up in the heat exchanger when
properly installed and operated under the
specified water quality conditions. For
installation in areas outside these
parameters, please consult the factory.
Water Flow Switch
Due to the low water content (between 3
and 6 gallons) of the copper finned tube
heat exchanger, a flow switch is factory
installed as a low water cutoff device. The
flow switch is installed in the outlet piping
from the water heater and wired in series
with the ignition system safety controls. In
(TABLE J) - REQUIRED PUMP PERFORMANCE FOR WATER HARDNESS OF 5 TO 25 GRAINS
MODEL
AMP
HORSE
VOLTAGE/
NUMBER
GPM
FT. HD.
DRAW
POWER
PHASE
PF0501
75
15
9.8
1/2
120 / 1
PF0751
75
15
9.8
1/2
120 / 1
PF1001
75
15
9.8
1/2
120 / 1
PF1300
75
15
9.8
1/2
120 / 1
PF1500
90
15
8.8
3/4
120 / 1
PF1700
90
15
8.8
3/4
120 / 1
PF2000
90
15
8.8
3/4
120 / 1
