Boiler Test

Front 1

Back 1

Condensate return-boiler feed water tank

Collects condensate from the system so it can be returned to the boiler

Front 2

Back 2

City water make up line

When condensate return tank level is low the city water make up line admits water to the tank to maintain minimum water level

Front 3

Back 3

Strainer

Strains out dirt and debris from the line. can be pulled apart and cleaned or blown down

Front 4

Back 4

Boiler feed water pump

Pumps water from boiler water feed tank through the Hartford loop to maintain water level in the boiler

Front 5

Back 5

Vent line
Prevents pressure build up or a vacuum from forming in the tank

Front 6

Back 6

Condensate return main

Returns condensate to the condensate return tank

Front 7

Back 7

Loop riser

Riser right before the Hartford Loop used to elevate the water to the tee that connects to the equalizing line

Front 8

Back 8

Concentric reducer

Reduces pipe size, keeps pipes on same center line

Front 9

Back 9

Equalizer-header drain connection

Connects the steam header to the boiler return connection equalizes supply pressure in the return line to the boiler

Front 10

Back 10

Loop riser

Feeds water to the boiler

Front 11

Back 11

Gate valve

Used for isolation

Front 12

Back 12

Pressure trol high limit with manual reset

Safety mechanism used to shutoff system if pressure goes above max pressure

Front 13

Back 13

Pressure trol subtractive differential operator

Starts and stops the boiler, set for min and max pressure

Front 14

Back 14

Control train

Header for pressure trols and gauges, keep steam from connecting instruments with condensate cushion, replaces pigtails

Front 15

Back 15

Clean out cross

Allows for inspection and cleaning of the control train

Front 16

Back 16

Pump control and low water cut-off

Activates the pump when boiler needs water, works in conjunction with pressure trols and boiler feed pump

Front 17

Back 17

Ball valve and blow down

Used for cleaning out the boiler

Front 18

Back 18

Secondary low water cut-off MM 67 with manual reset

If main low-water cut off fails it will kick off the boiler, will only turn back on with manual reset

Front 19

Back 19

Sight glass

Shows the water level in the boiler

Front 20

Back 20

Boiler drain

Used to drain the boiler

Front 21

Back 21

Swing check valve

Allows flow in one direction only. Position sensitive

Front 22

Back 22

Ball valve

Used to drain and clean strainer, isolation

Front 23

Back 23

Fast fill line

By passes the main header to quickly fill the boiler

Front 24

Back 24

Expansion tank

Air receiver, maintains constant minimum pressure

Front 25

Back 25

Expansion tank airtrol fitting

Release or add air to expansion tank

Front 26

Back 26

Prv - pressure reducing valve

Maintains minimum pressure

Front 27

Back 27

Float and thermostatic steam trap

Removes air and noncondensibles, returns condensate to the condensate return tank

Front 28

Back 28

Safety relief valve

Opens when pressure reaches max 30 psi and resets at 3 to 5 psi less than max

Front 29

Back 29

Shell and coil heat exchanger steam to water

Steam enters the shell and heats the water flowing through coils

Front 30

Back 30

Inline air separator

Removes entrained air bubbles from the water and sends them to the expansion tank

Front 31

Back 31

Dry well

Used to install a thermometer to test water temp

Front 32

Back 32

Balancing valve

Keeps gpm at nominal set point. Maintains proper amps

Front 33

Back 33

Steam supply line

Supplies steam to the heat exchanger

Front 34

Back 34

Hot water supply main

Supplies hot water to room units/system

Front 35

Back 35

Thermister

Changes the ohm resistance based on temperature. controls the outgoing water temp

Front 36

Back 36

Thermister

Changes the ohm resistance based on temperature. controls the outgoing water temp

Front 37

Back 37

Control panel

Houses all the controls and all the electrical of the hydronic system