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4. Installation
WARNING
•
Do not install an isolation valve between boiler and
pressure relief valve.
•
The discharge pipe for the pressure relief valve
must be oriented to prevent scalding.
•
Pipe pressure relief valve discharge pipe close to
floor drain.
•
Never pipe discharge pipe to the outdoors.
A
Boiler below radiation
B
Boiler above radiation
HV
Hi vent
LWCO
Low water cut-off
Heating circuit return pipe
Heating circuit supply pipe
CAUTION
CAUTION
•
A low water cut-off may be required by local
codes.
•
If the boiler is installed above radiation level, a
low water cut-off device of approved type (field
supplied) must be installed in all instances.
•
Do not install an isolation valve between boiler and
low water cut-off.
4.6.3. Connecting the expansion tank
Install the expansion tank on the heating return pipe
upstream of the boiler pump.
4.6.4. Connecting the condensate discharge pipe
The boiler comes with a built-in condensate trap. An
external trap is not required when connecting the field
drain to flexible discharge tubing.
Discharge tubing (field supplied) must be of 1"/2.5 cm
diameter. The drain pipe and fittings must conform to
ANSI standards and ASTM D1785 or D2846.CPVC or
30
Front View
Close Position
Front View
Open Position
Bottom View
MCA Pro 45/65/90/115
Side View
MCA-Pro ISM Rv.4.1 2/2017
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