HTP 850 LPHL - Manual (Page 16)

16
LP- 205 REV. 3.28.14
3. Connect the expansion tank to the air separator only if the separator is on the suction side of the circulator. Always install the system
fill connection at the same point as the expansion tank connection to the system.
4. Most chilled water systems are piped using a closed type expansion tank.
DIAPHRAGM (OR BLADDER) EXPANSION TANK
Always install an automatic air vent on top of the air separator to remove residual air from the system.
E. CIRCULATORS
DO NOT install automatic air vents on closed type expansion tank systems. Air must remain in the system and return to the tank to
provide an air cushion. An automatic air vent would cause air to leave the system, resulting in improper operation of the expansion tank.
DO NOT use the boiler circulator in any location other than the ones shown in this manual. The boiler circulator location is selected to
ensure adequate flow through the boiler. Failure to comply with this caution could result in unreliable performance and nuisance
shutdowns from insufficient flow.
SIZING SPACE HEAT SYSTEM PIPING
1. In all diagrams, the space heating system is isolated from the boiler loop by the primary/secondary connection.
2. Size the piping and components in the space heating system using recognized design methods.
F. HYDRONIC PIPING WITH CIRCULATORS, ZONE VALVES, AND MULTIPLE BOILERS
The boiler is designed to function in a closed loop hydronic system. The included temperature and pressure gauge allows the user to
monitor system pressure and outlet temperature from the boiler. It is important to note that the boiler has a minimal amount of pressure
drop that must be calculated when sizing the circulators. Each boiler installation must have an air elimination device that will remove air
from the system.
Install the boiler so the gas ignition system components are protected from water (dripping, spraying, etc.). Allow clearance for basic
service of the boiler circulator, valves, and other components. Observe minimum 1” clearance around all uninsulated hot water pipes
when openings around pipes are not protected by non-combustible materials.
On a boiler installed above radiation level, some states and local codes require a low water cut off device. This is provided standard on
the Mod Con boiler. Check with local codes for additional requirements. If the boiler supplies hot water to heating coils in air handler
units, flow control valves or other devices must be installed to prevent gravity circulation of boiler water in the coils during the cooling
cycle. Chilled water medium must be piped in parallel with the boiler.
Freeze protection for new or existing systems must use glycol specifically formulated for this purpose. This glycol must include
inhibitors that will prevent it from attacking metallic system components. Make certain that the system fluid is checked for the correct
glycol concentration and inhibitor level. The system should be tested at least once a year and as recommended by the producer of the
glycol solution. Allowance should be made for the expansion of the glycol solution in the system piping. Example: 50% by volume glycol
solution expands 4.8% in volume for the temperature increase from 32
o
F to 180
o
F, while water expands 3% over the same temperature
rise.
Never use dielectric unions or galvanized steel fittings when connecting to a stainless steel storage tank or boiler. Failure to follow this
instruction can lead to premature failure of the boiler system. Such failures ARE NOT covered by warranty.
The boiler should not be operated as a potable hot water heater. The boiler should not be used as a direct hot water heating device.
Basic steps are listed below that will guide the installation of the boiler.
1. Connect the system return marked “Boiler Return”.
2. Connect the system supply marked “Boiler Supply”.
3. Install purge and balance valve or shut off valve and drain on system return to purge air out of each zone.