Appendix C & D & E - Sentry S-34 Installation And Operating Instructions Manual

Sentry
Thermostatic bypass valves type TV are designed to allow
boilers to reach their optimum operating temperature
quickly and to prevent cool/cold return temperatures from
affecting them.
Operation/Installation: The thermostat within the "TV" valve
allows full flow through the bypass until the predetermined
temperature is reached.
Start Up: With the balancing valve on the bypass fully
open, operate the boiler until it reaches its normal
operating temperature. If hot water does not automatically
flow to the system then adjust (throttle) the bypass
balancing valve until flow (hot water) to the system is
SIZE
25 mm (1") NPT (female x female)
32 mm (1 1/4") NPT (female x female)
38 mm (1 1/2") NPT (female x female)
Max. operating pressure 6 bar (85 psi) Maximum operating temperature 110°C (230°F)
The flow factor Kv is the number of cubic meters per hour of water at 20°C which will flow through the valve with a pressure drop of 1kg/cm
The flow coefficient Cv is the flow of water at 60°F in US gallons per minute at a pressure drop of 1lb/in
Recent investigations of boilers which were installed in hard
water areas, revealed that mineral deposits had accumulated
at the bottom of the heat exchanger. In addition, sludge, scale
and other solid contaminants were present in boilers installed
in older systems or where the water was supplied from a well.
This accumulation creates an insulating layer that drastically
affects boiler efficiency by reducing the transmission of heat
through this primary transfer surface and causes extreme
metal temperatures that eventually crack the heat exchanger.
THE TERMS OF THE BOILER WARRANTY WILL NOT
APPLY TO FAILURES ENCOUNTERED UNDER THESE
CIRCUMSTANCES.
The boiler warranty does not cover leaks resulting from
corrosion caused by the use of underfloor plastic tubing
without an oxygen diffusion barrier. Systems must have the
non-oxygen diffusion barrier tubing separated from the
APPENDIX C
Thermostatic Bypass Valve
S/F PART NO. OPEN TEMP .
116040 46 ºC
116041 46 ºC
116042 46 ºC
APPENDIX D
Accumulation of Foreign Deposits in Heat Exchanger
APPENDIX E
Use of Non-Oxygen Diffusion Barrier Underfloor Tubing
established. If flow is already to the system, no adjustment
is required.
Return Mounting: On the return "TV" allows full bypass until
the return temperature reaches 46 degrees Celsius (115
degrees Fahrenheit). "TV" will begin opening while main -
taining a 46 degrees Celsius (115 degrees Fahrenheit)
minimum return temperature. When return temperatures
reach approximately 54 degrees Celsius (130 degrees
Fahrenheit) most of the flow will be through the system.
Mounting: "TV" can be installed in any position. An adjust -
able balancing valve (or ball valve) must be installed on
the bypass.
A
115 ºF 107 mm 4.2"
53 mm 2.1"
115 ºF 114 mm 4.5" 57 mm 2.25"
115 ºF 119 mm 4.7" 60 mm 2. 35"
RECOMMENDATIONS:
On all installations in hard water areas:
1. The system should be thoroughly inspected for leaks which
must be repaired however minor they may be.
2. The initial water charge of the system must be treated to
reduce its hardness to an acceptable level.
In addition to the aforementioned, older systems and those
supplied from wells may require that a filter or strainer be
incorporated in the circuit at some point on the return line
closest to the boiler. Suitable water treatment filters are com-
mercially available for this purpose.
WE STRONGLY RECOMMEND THAT YOU CONVEY THIS
VITAL INFORMATION TO ALL PARTIES CONCERNED.
boiler with a heat exchanger, Slant/Fin recommends the use
of underfloor plastic tubing with an oxygen diffusion barrier.
Other system components may also require protection from
oxygen permeation.
Kv Cv
A/2
8.96 10.5 1.5 kg
13.99 16.4 2.0 kg
17.23 2.4 kg
20.2
2 across the valve.
19
WEIGHT
3.3 lb
4.4 lb
5.3 lb
2 (1 bar).