National Products BW3 - Manual (Page 11)

4. Install a sediment trap upstream of gas controls.
5. Use 2 pipe wrenches when making connection to gas valve to keep it from turning.
6. Install a manual shutoff valve in vertical pipe about 5 ft above floor.
7. Tighten all joints securely.
8. Propane gas connections should only be made be a licensed propane installer.
9. Two-stage regulation should be used by propane installer.
10. Propane gas piping should be checked be propane installer.
PROCEDURE 3—CHECKING GAS PIPING
Upon completion of piping, check immediately for gas leaks. Open the manual shutoff valve. Test for leaks by applying soap suds (or a liquid
detergent) to each joint. Bubbles forming indicate a leak. CORRECT EVEN THE SMALLEST LEAK AT ONCE.
WARNING: Never use a match or open flame to test for leaks. Use a soap-and-water solution. A failure to follow this
warning could result in fire, explosion, personal injury, or death.
ELECTRICAL WIRING
All electrical work must conform to local codes as well as the National Electrical Code (NEC) ANSI/NFPA-70-1999. In Canada, electrical wiring
shall comply with the Canadian Electrical Code CSA C22.1.
See Fig. 7 for unit wiring diagram.
PROCEDURE 1—ELECTRIC POWER SUPPLY
WARNING: Turn off electric power at fuse box before making any line voltage connections. Follow local electric
codes. Failure to follow this warning could result in electrical shock, personal injury, or death.
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after servicing.
Run a separate 120-v circuit from a separate overcurrent protective device in electrical service entrance panel. This should be a 15-amp circuit.
Locate a shutoff switch at boiler. It must be turned off during any maintenance. Connect 120-v power supply to aquastat terminals L1 (HOT) and
L2.
The boiler, when installed, must be electrically grounded in accordance with the requirements of the authority having jurisdiction, or in the absence
of such requirements, with the NEC. Run a 14 gage or heavier copper wire from boiler to a grounded connection in service panel or a properly
driven and electrically grounded ground rod.
PROCEDURE 2—INSTALLING THERMOSTAT
Thermostat location has an important effect on the operation of boiler system. BE SURE TO FOLLOW INSTRUCTIONS INCLUDED WITH
THERMOSTAT.
Locate thermostat about 5 ft above floor on an inside wall. It may be mounted directly on wall or on a vertically mounted outlet box. It should
be sensing average room temperature so avoid the following:
DEAD SPOTS:
Behind doors
Corners and alcoves
HOT SPOTS:
Concealed pipes
Fireplace
TV sets
Radios
Lamps
Direct sunlight
Kitchens
COLD SPOTS:
Concealed pipes or ducts
Stairwells—drafts
Doors—drafts
Unheated rooms on other side of wall
Set heat anticipator at 0.2 amps. The 24-v thermostat connects to aquastat terminals T and T.
SEQUENCE OF OPERATION
1. Thermostat calls for heat, powering 1K relay coil and closing contacts 1K1 and 1K2.
2. Circulator pump is powered through terminals C1 and C2.
3. Induced draft blower and AT 140C transformer primary are powered through terminals B1 and B2.
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