Archgard 42-DVT40N - Manual (Page 10)

Northfire 42
10
INSTALLATION INSTRUCTIONS Cont...
Natural Gas Pressure Settings:
The inlet supply or line pressure must be a minimum of 4.5” w.c. (1.1 kPa) and a maximum of
8” w.c. (2 kPa). The orifice has a #31 DMS drill size.
ELEVATION INPUT RATING
0-4500 ft. (0-1372 m) 40,000 BTU/hr (11,700 watts)
4500 ft. (1372 m) + 40,000 BTU/hr (11,700 watts) less 4% per 1000 ft. (300 m)
Please contact your local distributor for the appropriate orifice size.
Propane Pressure Settings:
The inlet supply or line pressure must be a minimum of 11” w.c. (2.8 kPa) and a maximum of
14” w.c. (3.5 kPa). The orifice has a #50 DMS drill size.
ELEVATION INPUT RATING
0-4500 ft. (0-1372 m) 36,500 BTU/hr (10,700 watts)
4500 ft. (1372 m) + 36,500 BTU/hr (10,700 watts) less 4% per 1000 ft. (300m)
Please contact your local distributor for the appropriate orifice size.
NOTE: THE INPUT RATING SHOULD ALWAYS BE CHECKED WHEN FIRST RUNNING
THIS APPLIANCE. To do this, reduce the background flow rate, time the meter, light the
fireplace and take another reading after 15 mins. of operation. Check with your gas supplier for
the gas BTU content at your elevation. Input is the rate of flow multiplied by the heating value
of the gas (cubic feet/hour x BTU per cubic feet). Adjust the manifold pressure so that the unit
does not operate above the rated input. To do this, loosen the screw on the variable input knob
on the valve and reposition that the maximum input is correct. Retighten the screw.
ELECTRICAL CONNECTIONS
The Northfire 42 comes complete with a Blower installed and wired to an internal junction box.
Have a qualified electrician run a 120VAC supply line to the lower left side of the fireplace
before installing the appliance. He should leave 18” (460mm) of the supply line free for ease of
connection to the appliance. Connect the electrical supply line to the appliance at the same
time the gas line is being connected to the appliance.
Flip open the bottom grill and undo the 2 screws holding the control panel. Run the line into the
left side of the appliance through the hole in the rear of the junction box and hold with a
standard ⅞” clamp. Connect the ‘live’ (black) supply conductor to the free black conductor from
the speed controller with a marrette type wire connector. Connect the ‘neutral’ white supply
conductor to the free white conductor from the convection fan with a marrette type wire
connector. Connect the ‘ground’ (green or bare) conductor to the ground screw in the junction
box. Replace the junction box cover and control panel and fasten with the 2 screws.