Part 4 Water Connection; Freeze Protection Outdoor Installation; Warning Regarding Chilled Water Systems; Inlet And Outlet Connections - Camus Hydronics DMH 081 Installation, Operation And Service Manual

PART 4 WATER CONNECTION
•
Check all applicable local heating, plumbing and
building safety codes before proceeding.
•
If the appliance is installed above radiation level it must
be provided with a low water cut-off device at the time of
appliance installation (available from Camus). Some
local codes require the installation of a low water cut-off
on all systems.
•
A pressure relief valve is supplied with each DynaMax.
The relief valve must be mounted in a vertical position
and piped to the floor in a manner acceptable to the
enforcing authority.
•
Be sure to provide unions and gate valves at inlet and
outlet to the appliance so that it can be easily isolated
for service.
•
On combination heaters a flow setter valve at the
appliance outlet facilitates setting of the desired outlet
temperature at high fire. Refer to Section 12.9 Domestic
Hot Water with Plate Heat Exchanger for more details
•
This appliance is a low mass stainless steel tube design
which provides for instant heat transfer. All appliances
are supplied with an internal suitable specific pump
mounted in place. When replacing the pump, replace
with one of equal or better-performance.
•
An air vent is supplied on the heat exchanger header to
eliminate trapped air. Install venting devices at high
points in the system as well to eliminate trapped air in
the piping.
•
Use suitable pipe hangers or floor stands to support the
weight of all water and gas piping.
•
The DynaMax must be installed so that the gas ignition
system components are protected from water (dripping,
spraying, rain, etc.) during appliance operation and
service (circulator replacement, control replacement,
etc.)
4.1 FREEZE PROTECTION OUTDOOR
INSTALLATION
•
Appliance installations are not recommended outdoors
or in areas where danger of freezing exists unless
precautions are taken. Maintaining a mixture of 70%
water and 30% propylene glycol is the preferred method
of freeze protection in hydronic systems. DO NOT
exceed a mixture of 50/50. This mixture will protect the
appliance to approximately -35ºF (-37ºC).
•
For Outdoor installations a snow screen should be
installed to prevent snow and ice accumulation around
the appliance. Regular inspections should be made to
ensure that air inlet and vent are free of snow and ice.
Always consider the use of a shelter such as a garden
shed in lieu of direct exposure of the appliance to the
elements. The additional protection afforded by the
shelter will help to minimize nuisance problems with
electrical connections and will allow easier servicing of
the appliance under severe weather conditions.
4.2 WARNING REGARDING CHILLED WATER
SYSTEMS
When an appliance is connected to an air conditioning
system where the same water is used for heating and
cooling, the chiller must be piped in parallel with the
appliance. Appropriate flow control valves; manual or
motorized must be provided to prevent the chilled water from
entering the appliance.
Figure 16: Chilled Water System
4.3

INLET AND OUTLET CONNECTIONS

•
All water connections must meet American National
Standard Pipe Threads (NPT).
•
For ease of service, install unions on inlet and outlet of
the appliance. The connection to the appliance marked
"Inlet" on the header should be used for return from the
system. The connection on the header marked "Outlet"
is to be connected to the supply side of the system.
4.4

MINIMUM PIPE SIZE REQUIREMENTS

Minimum water pipe connections are as follows for DynaMax
single unit installations. The equivalent number of straight
feet of pipe for each valve and fitting in the connecting piping
must be considered to properly arrive at the total equivalent
feet of straight pipe in the field installed piping to the
appliance. Consult factory if longer piping distances are
required for a specific application. It is recommended to use
copper piping for all system piping to reduce the possibility of
the formation of deposits, which may result in heat
exchanger starvation.
Table 11: Minimal System Pipe Size
Input,
Btu/Hr
80,000
100,000
150,000
200,000
250,000
299,000
399,000
500,000
600,000
750,000
Water
Size,
NPT
[in.]
1
1
1
1 1/4
1 1/4
1 1/2
2
2
2
2
14