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4. Installation
4.7 Gas connection
A
Gas shut-off valve (Field supplied)
B
T-fitting (Factory supplied)
C
Drip leg (Field supplied)
D
Cap (Field supplied)
E
Elbow (Field supplied)
F
Gas shut-off valve (Factory supplied)
G
¾" Pipe union (Field supplied)
4.7.1. Making piping connections
Support piping by proper suspension method. Piping
must not rest on or be supported by boiler. Use Teflon
tape to connect pipe work. Leave 2 end threads bare.
CAUTION
Use only yellow Teflon tape (CSA4-90, UL listed) that
is approved for gas use.
4.7.2. Gas connection
WARNING
•
Close the main gas valve before starting work on
the gas pipes.
•
Before mounting, check that the gas meter has
sufficient capacity. To do this, you should keep in
mind the consumption of all appliances.
•
If the gas meter has too low a capacity, inform
the gas/utility supply company.
32
A
F
B
C
G
E
D
MCA Pro 45/65/90/115
Make gas connections in accordance with codes CAN/
CSA B149.1 and 2 or National Fuel Gas Code ANSI
Z223.1/NFPA 54, as well as local codes.
1. Connect the gas pipe to the pre-assembled gas
shut off valve under the boiler (NPT side).
2. Once connected, close gas shutoff valve on boiler.
Refer to current CAN/CSA B149.1 and 2 or
National Fuel Gas Code ANSI Z223.1/NFPA
54, as well as local codes for gas piping
requirements and sizing. Pipe size to the
boiler must be determined based on:
•
Pipe length
•
Number of fittings
•
Type of gas used
•
Maximum input requirements of all gas
appliances in the residence. Design piping
layout in such a way that piping does not
interfere with serviceable components.
3. Before connecting boiler to gas line, install
ground joint union, capped drip leg and a manual
equipment shutoff valve as shown. (Valves must be
listed by a nationally recognized testing agency).
4. Make boiler gas connection. Support piping by
proper and accepted methods. Boiler must never
carry the weight of the piping system.
5. Perform gas piping pressure test (Maximum gas
supply pressure is 14"w.c/0.5 psig).
6. When performing the gas piping pressure test,
the gas supply pressure should be equal to or less
than 14"w.c/0.5 psig. Isolate the boiler from the
gas supply system by using the installed shut-off
valves. If the gas supply pressure is greater than
14"w.c/0.5 psig, the boiler must be disconnected
from the gas supply system piping.
7. Ensure that no noticeable pressure drop occurs in
the gas supply line when all appliances connected
to it are operating.
8. When performing the leak test, use approved liquid
solution for the bubble test. Ensure that no liquid
comes in contact with any electrical components,
wires or connectors. Do not allow the leak detection
fluid to come in contact with the gas valve or
regulator.
9. Correct any and all deficiencies.
10. Purge any air from the gas lines and the system.
11. Identify shutoff valves as such with a tab and
familiarize operator/ultimate owner of boiler with
these valves.
MCA-Pro ISM Rv.4.1 2/2017
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