Multiple Storage Tank / Water Heater Installations; Pump Operation - Lochinvar Power-Fin Series Installation And Service Manual

MULTIPLE STORAGE
TANK INSTALLATIONS
FIG. 58 Single Water Heater Piping with Two Storage
Tanks
MULTIPLE WATER
HEATER INSTALLATIONS
FIG. 59 Multiple Water Heater Piping with a Single
Storage Tank
FIG. 60 Multiple Water Heater Piping with Multiple
Storage Tanks
TABLE — W
Common Water Manifold Size for
Multiple Water Heater or Hot Water
Supply Boiler Installations
Pipe sizing chart provides minimum pipe size for
common manifold piping to ensure adequate flow.
Number of Water
Heaters
1
2
3
4
5
6

PUMP OPERATION

1. The water heater must have a properly sized circulating
pump. This pump is sized to circulate water between the
heater and storage tank only.
2. The pump is sized to the heater input and water chemistry
specifications noted in the "Water Chemistry" section.
3. The diameter and length of the piping installed between the
storage tank(s) and water heater must be properly sized
based on the capacity of the circulating pump.
4. The pump must run continuously when the water heater is
firing. This is the standard operating system for a water
heater.
An intermittent pump control function is provided with an all
bronze pump. The pump will operate only while there is a "Call
for Heat" and for a timed period after the water temperature set
point is satisfied to remove any residual heat from the
combustion chamber.
5. Lubricate pump to manufacturers recommendations. Pump
damage due to inadequate lubrication is non-warrantable.
6. The operating temperature sensor for a water heater is
installed in the inlet piping to the water heater.
With an intermittent pump control feature, the operating sensor
must be installed in the tapping provided in the lower 25% of
the storage tank to achieve proper operation. As shipped from
the factory, the operating sensor is installed in a bulbwell
mounted in the inlet piping to the water heater. When the pump
cycles off in normal operation, this sensor location may not
adequately sense a quick drop in temperature from a draw of hot
water from the storage tank. Placing the sensor in the tapping
50
Common
Manifold Size (Min.)
2 1/2"
4"
4"
5"
6"
6"