LAARS SUMMIT SMW-250 - Install and Operating Manual - Manual (Page 10)

Page 10 LAARS Heating Systems
Figure 10. Piping Diagram for Modular Units and/or Hydro Air Systems.
4A.2 Return Connections
1. Install a strainer between the SUMMIT boiler
and the system.
2. Connect the 1¼" return connection on the
appliance to the return side of the system
circulating loop.
3. Install a check valve (multiple appliances only),
a shutoff valve and a drain valve near the
appliance in the return line.
4. Install a properly sized circulator in the system
loop.
4A.3 Cold Water Make-Up
1. Connect the cold water supply to the inlet
connection of an automatic fill valve.
2. Install a suitable back flow preventer between
the automatic fill valve and the cold water
supply.
3. Install shut off valves where required.
NOTE: The boiler, when used in connection
with a refrigeration system, must be installed so the
chilled medium is piped in parallel with the boiler
with appropriate valves to prevent the chilled medium
from entering the boiler.
The boiler piping system of a hot water heating
boiler connected to heating coils located in air
handling appliances where they may be exposed to
refrigerated air circulation must be equipped with
flow control valves or other automatic means to
prevent gravity circulation of the boiler water during
the cooling cycle.
The boiler when installed above the radiation
level must be provided with a low water cutoff device
at the time of boiler installation.
SECTION 4B.
Water Connections
SMW-200/250 Water Heater
4B.1 Water System Piping,
Fittings and Accessories
Hot water piping should be supported by suitable
hangers or floor stands, NOT by the appliance. Due to
expansion and contraction of copper pipe,
consideration should be given to the type of hangers
used. Rigid hangers may transmit noise through the