2
TH-750-IMI-REV-
5
Section 1 – Hookup and Installation
1. The TH-750 should be located in an area so that it will be easily accessible for any
inspection
and repairs. Secure to the floor using the four mounting holes in the base floor
stand.
2. Pipe clean water o
r
fluid to be heated to the inlet on the lower side making provision for the
loop recirculation. Install a check valve and suitable “Y” strainer on the inlet.
3. Pipe the heat
er outlet
from the top of the TH-750 to the users. A recirculation loop for the
h
ot circuit
is recommended.
4. Service (isolation) valves should be located at all inlets and outlets.
5. Always open the cold side first and check for any leaks.
6. Pipe steam (125 psig Max) to the control inlet valve. If a “Y” strainer and drip steam trap were
not supplied with the TH-750 heater, they should be installed with the isolation valve.
7. If a “Y” strainer and drip trap are not installed, dirt and condensate will build up on zero or low
load conditions.
Failure to install a “Y” strainer and drip trap on the steam supply line
voids the warranty.
8. Be sure the steam supply is sized correctly – consult Thermaflo Engineering if you are unsure
of the size.
9.
Always open the cold (WATER) side first before opening the hot (STEAM) side and always
introduce steam to the unit slowly.
10. For gravity return systems, the TH-750 will be supplied with a factory sized Float &
Thermostatic steam trap.
Never substitute with another manufacturer’s steam trap or a
different trap other than that supplied with the TH-750V unit as this could effect
operation and will void the warranty
. If the steam trap cannot be located at the time of
installation, contact your local Thermaflo Engineering representative.
11.
For TH-750 units installed where the condensate drains into a gravity return system,
the condensate piping must not be elevated or lifted as this will cause water hammer,
erratic control, flooding of the tube steam space, premature tube failure and will void
the warranty.
12. For pressurized condensate return systems or where a lift is required, the TH-750 should
be supplied and fitted with a Thermaflo Engineering pump trap
o
n
pressure powered
pump in place of the F & T trap.
13. Pipe the high temperature dump valve shell drain valve P&T Valve to suitable drain.
This valve will discharge a considerable amount of water when it opens. Never allow this valve to
be piped to drain that will not carry full flow discharge. Installer is responsible for selecting
adequate drain size. See drawing for details.
14. Always leave the vacuum breaker, located below the inlet steam pressure gauge, open to
atmosphere.
