Electrical Wiring - Slant/Fin LYNX LX-85A Installation And Operating Instructions Manual

National Excelsior Company
www.excelsiorhvac.com
At 30 ft. length of pipe, match required capacity from table on
this page (choose higher capacity, in this case is 152 cu. ft. per
hour). Required pipe size is
Improper gas pipe sizing will result in flame outages, insuffi-
cient heat and other installation difficulties. For more informa-
tion and also if other appliances are to be attached to the
piping system, see Appendix C of National Fuel Gas Code
ANSI Z223.1-latest edition.
C. The boiler and its gas connection must be leak tested
before replacing the boiler in operation. Use liquid soap
solution for all gas leak testing. DO NOT use open flame.
This boiler and it's individual shutoff valve must be
disconnected from the gas supply piping system during and
pressure testing of that system at test pressures in excess
of ⁄ PSIG. This boiler must be isolated from the gas supply
1
2
piping system by closing its individual manual shutoff valve
during any pressure testing of the gas supply piping system
at test pressures equal to or less than
D. All gas piping used should be inspected thoroughly for
cleanliness before makeup. A sediment trap is integrally
provided, as illustrated on page 3.
E. The minimum and maximum gas supply pressure (at the
inlet of gas valve) are shown on the boiler rating plate for
the type of gas used. Gas supply pressure should never be
less than minimum or more than maximum pressure when
the boiler or any other appliance is turned on or off.
Gas Flow In piping -- cu. ft. per hr.
Length
Iron Pipe Size (IPS) — inches
of pipe
in Feet 1/2
/
3
10 132 278
20 92 190
30 73 152
40 63 130
50 56 115
60 50 105
70 46 96
80 43 90
90 40 84
100 38 79
At pressure drop of 0.3 in. water, specific gravity = 0.6.

ELECTRICAL WIRING

All field wiring to the boiler is connected to the 2 sets of
terminal strips, located under the jacket top panel.
(See Figure 2, on page 3)
DANGER: Before wiring always turn off electric power supply.
Otherwise, shock or death can result.
1. Power Supply
A separately fused circuit is recommended. Use standard
15 Amp. fuse or breaker and 14 gage conductors in BX
cable or conduit.
Provide disconnect means and overload protection as
required. See boiler wiring diagram (Figure 16a) boiler
control (Figure16b) and ladder diagram (Figure 16c).
⁄ ".
3
4
⁄ PSIG.
1
2
1 1 /
1
4 4
520 1050
350 730
285 590
245 500
215 440
195 400
180 370
170 350
160 320
150 305
Subject to change without notice.
Boiler must be electrically grounded in accordance with the
requirements of the authority having jurisdiction, or, in the
absence of such requirements, with the National Electrical
Code, ANSI/NFPA 70-latest edition.
Proper polarity is critical for the power supply connections.
Reversed polarity will cause system lockout. Proper ground-
ing is critical for boiler operation, connect the ground wire to
the green ground screw next to the line voltage terminal
strip.
2. Circulator(s)
A set of terminals are provided for the boiler (primary loop)
circulator. Only wire this circulator to these terminals,
additional (secondary loop) circulators for space heating
require the use of relays and a separate power source.
For multiple zoning, either zone valves or circulators maybe
used.
For zone valve system (See Figure 17a).
For pump zoning system (See Figure 17b and 17c).
DO NOT use boiler transformer to power external
accessories like zone valve and relays, overload and/or
burned out transformer and boiler malfunction can result.
Use separate transformer to power such components.
A second set of terminals are provided for the domestic hot
water tank circulator (if used). The primary loop circulator is
always de-energized when the DHW tank circulator is
energized, for priority.
1 /
1
2
3. SPACE HEATING THERMOSTAT(S)
1600
Install thermostat on an inside wall and away from any heat
1100
sources, sunshine and drafts. A set of terminals are provid-
890
ed for connection of 24 volt style thermostats, relays or zone
760
valve end switches (isolated contacts). (See wiring diagram
670
Figure 16a).
610
560
Thermostat heat anticipator: For a non-zoned system set
530
thermostat heat anticipator to 0.1 Amps, for zoned system
490
set to match power requirements of zone valves or relays.
460
Refer to manufacturer's instructions and specifications. Also
see instructions with thermostat.
4. DOMESTIC HOT WATER TANK THERMOSTAT
A set of terminals are provided for connection of the DHW
tank thermostat (if used). (See wiring diagram Figure 16a).
5. OUTDOOR AIR SENSOR
A set of terminals are provided for connection of an outdoor
air sensor (if this method is used). (See wiring diagram
Figure 16a).
The outdoor air sensor must be a 12k ohm type. Mount on
an outside wall, shielded from direct sunlight or flow of heat
or cooling form other sources. See instructions provided
with sensor.
6. LOW WATER CUTOFF
A set of terminals are provided for connection of a LWCO. If
this device is used, remove the factory installed jumper from
these terminals. (See wiring diagram Figure 16a).
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