Laars Mascot II, Installation And Operation Instructions Manual

Page: 17 / 52

Mascot II Boilers and Water Heaters
Page 17
SECTION 5.
Pump Capacity
5.1 Mascot II Heating System
Pump Capacity
(see Figure 11)
HEATING DHW
SIZE CONN SIZE CONN SIZE
125 3/4" 1/2"
Table 7. Water Connection Pipe Sizes.
SECTION 6.
Water Connections
6.1 Central Heat System Piping
NOTE: This appliance must be installed in a closed
pressure system with a minimum of 12 psi (82.7kPa)
static pressure at the boiler.
Hot water piping should be supported by suitable
hangers or floor stands. Do not support piping with this
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 system resulting from the piping sliding in the
hangers. It is recommended that padding be used when
rigid hangers are installed. Maintain 1" (2.5cm)
clearance to combustibles for hot water pipes.
Pipe the discharge of the relief valve (full size) to
a drain or in a manner to prevent injury in the event of
pressure relief. If system contains more than 24 gallons
(91 liters), then an auxiliary expansion tank is required.
Minimum fill pressure must be 12psig (82.7kPa). Install
shutoff valves where required by code.
Suggested piping diagrams are shown in Figures
12 through 19 . These diagrams are meant only as a
guide. Components required by local codes must be
properly installed.
Mascot II's efficiency is higher with lower
return water temperatures.
Mascot II MUST be piped in a primary-secondary
fashion (using either piping or a hydraulic separator)
such that the pump that is mounted on the boiler ONLY
serves the boiler.
Mascot II boiler must be located within 15 feet
(4.6m) of the supply and return header (or the hydraulic
separator). The pump is sized for a maximum of 30 feet
(9.1m) of piping and the headloss of the boiler only
(see
Figure 11) .
For custom configurations, the available pump
head is provided in Figure 18. The system designer
should take into account allowable boiler temperature
rise of 65°F (36°C).
6.2 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.
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
Figure 11. Available Pump Head.
Figure 12. DHW Connections with Anti-Scald Valve and
Flow Restrictor.