Crown Boiler MAXI-THERM MT040G, Инструкция по установке и эксплуатации

Страница: 21 / 41

VI. PIPING
BOILER SIDE PIPING
Figures 6-11 show typical boiler side piping for several common situations. Regardless of which system is
used, it is imperative that the flow rates called for in Table 1 are developed through the coil. This requires
properly sized piping and a properly sized pump. To determine the pipe/pump sizes required see Part III. The
systems shown in Figures 6-11 are described below:
STANDARD CIRCULATOR ZONE
This system is just like a straight heating circulator zone system except that one of the zones goes to the
Maxi-Therm coil instead of radiation. As on any circulator zone system, control valves should be installed in
each zone to prevent unwanted circulation through zones which are not calling for heat. Figure 6 illustrates
typical circulator zone piping.
ZONE VALVE SYSTEM
As with the circulator zone system, this system is just like a standard heating zone system except that one of
the zones is connected to the Maxi-Therm coil. The circulator must be large enough to move boiler water
through the coil at the flow rate in Table 1, regardless of the flow rate required through the heating zones.
Figure 7 illustrates a typical zone valve system.
3-WAY ZONE VALVE SYSTEM
This system offers a simple method of prioritizing the Maxi-Therm. In this system a 3-way zone valve is used
which has a “common” port, a “normally open” port, and a “normally closed” port. The zone valve motor is
wired so as to be energized by the Maxi-Therm thermostat (see Part VII for wiring information). The
common side of the zone valve is connected to the boiler. The heating zone is connected to the normally open
side of the zone valve and the Maxi-Therm coil is connected to the normally closed side of the zone valve. As
long as the Maxi-Therm is not calling for heat, boiler water can flow from the space-heating zone, through
the normally open side of the 3-way valve, to the boiler. As soon as the Maxi-Therm calls for heat, the zone
valve is energized, and boiler water can only flow through the Maxi-Therm zone. Figure 8 illustrates a
typical 3-way zone valve system.
CAUTION
Do not connect a Maxi-Therm to a boiler system having a significant amount of make up
water or radiant tubing without an oxygen barrier. Doing so may cause premature failure of
the Maxi-Therm coil.
20
WARNING
Install a relief valve on the boiler per the boiler manufacturer’s instructions. Also refer to
the boiler manufacturer’s instructions and the authority having jurisdiction for other possible
boiler-side piping requirements, such as low water cut-offs or flow switches. The following
illustrations are intended to illustrate zone piping; they are not comprehensive boiler piping
instructions.