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4. Installation
DANGER
The gas supply piping must be leak tested before
placing the boiler in operation. Never check for gas
leaks with an open flame. Carry out the leak test
according to good engineering practices.
CAUTION
•
Ensure that there is no dust in the gas pipe.
•
We recommend installing a gas filter on the gas
pipe to prevent clogging of the gas valve unit.
•
Connect the gas pipe in accordance with
prevailing codes and regulations.
•
Exposing the gas valve and regulator to extreme
pressures will render the warranty null and void.
Operating Instructions
CAUTION
Start up of boiler is only possible ofter complete
installation & approval by your local inspector. This
inculdes water, gas, electrical and flue systems.
1. This appliance is equipped with an ignition device
which automatically lights the burner. Do not try to
light the burner by hand.
2. Set room thermostat(s) to lowest setting. Verify
external manual gas valve is open (valve handle
parallel to gas piping).
3. Turn OFF all electrical power to the appliance.
4. Turn boiler manual gas valve knob counter
clockwise
to open gas supply
5. Wait five (5) minutes to clear out any gas. Then
smell for gas, including near the floor. If you smell
gas, STOP!.
What to do if you smell Gas
-
Evacuate all people.
-
Do not try to light any appliance.
-
Do not touch any electric switch; do not use any
phone in your building.
To open gas valve
To OPEN
(Counter clockwise)
MCA-Pro ISM Rv.4.1 2/2017
To close gas valve
To CLOSE
(clockwise)
MCA Pro 45/65/90/115
-
Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
-
If you cannot reach your gas supplier, call the fire
department.
If you don't smell gas, go to the next step.
8. Turn ON all electrical power to the appliance.
9. Set thermostat(s) to desired setting.
10. The control display will show symbols and text
describing the status of the boiler as it proceeds
through its operating sequence. "Standby" status
means there is no call for heat. A faucet or flame
symbol on the display means the boiler is firing.
11. If the appliance will not operate when there is
a call for heat and piping is not hot, follow the
instructions "to turn Off Gas To Appliance" below
and call your service technician or gas supplier.
To turn off gas to the appliance
1. Set room thermostats to lowest setting.
2. Turn OFF all electrical power to the appliance.
3. Close external manual gas valve (valve handle
perpendicular to gas piping). Remove boiler access
door. Turn boiler manual gas valve knob clockwise
to close gas supply.
4. Replace boiler access door.
4.7.3 Installation procedure for gas valve
Step 1
Remove anti dust plug.
Step 2
Apply yellow Teflon tape (type Milspec A-A-
58092 for gas only) to male thread.
Step 3
Tighten gas valve onto ½" NPT thread using a
pipe wrench.
Step 4
Ensure tight fit and no damage to shut-off
lever.
A
Gas shut-off valve (Field supplied)
B
Gas shut-off valve (Factory supplied)
A
B
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