LAARS HWG-M2-250 - Installation, Operation and Maintenance Instructions - Manual (Page 10)

Page 10
LAARS Heating Systems
Figure 9. Condensate drain tube outlet.
NOTE: All internal electrical components have
been prewired. No attempt should be made to connect
electrical wires to any other location except the wiring
box designated above.
Wiring connections are indicated on the wiring
diagram (see Figure 10).
3.7 Main Power
Connect a 15 amp, fused, 120-volt supply to the
main power switch (hot leg is connected directly to
switch). Neutral leg is connected directly to the white
wire. Ground wire can be connected to the grounding
screw in the box.
3.8 Temperature Control
Connect the tank aquastat to the red and white/
red wires marked “T”. Do not connect two units to the
same set of aquastat contacts.
SECTION 4.
Start Up
4.1 Filling the System
1. Open all valves.
2. Fill 9600 HWG Water Heater and the system
completely.
3. Purge air from system. Bleed air from 9600
HWG using the air bleed at top of thermostatic
valve inside unit under access plate on top panel.
4. Set aquastat to call for heat, turn on power at
main switch for 30 seconds, then turn off.
5. Bleed 9600 HWG Water Heater and system
again. After system is fully purged, the 9600
HWG Water Heater is ready for firing.
4.2 Operation Checklist
1. Be sure that system has been filled properly (see
above) and is leak tight.
2. Open gas cock(s) and open manual gas shutoff
valve by turning to “on” position (see Figure 11).
3. Turn on main switch, set aquastat to call for
heat.
4. Blower will come on.
5. NOTE: Burner may not ignite on first attempt
because of air contained in gas lines. In this case
blower will stop after 5 minutes. Should this
happen, turn off main switch. Wait five minutes
and turn on switch again.
If burner fails three times, refer to Service Manual.
6. After placing the water heater in operation, the
burner safety shutoff device must be tested. To
test, disconnect ignitor plug at ignitor. Attempt
to start appliance. After the burner control has
completed three complete cycles the gas valve
must not open again and the VALVE / FLAME
light on the burner control must flash. Failure to
operate in this manner must be corrected by a
qualified service contractor or gas company.
Safe lighting and other performance criteria were
met with the gas manifold and control assembly
provided on the water heater when it underwent
tests specified in ANSI Z21.10.3-Latest Edition
and CAN / CGA 1 - 4.3 Latest Edition.
CAUTION: Should any pronounced odor of gas
be detected or if the gas burner does not appear
to be functioning in a normal manner, close main
shut off valve and contact your heating
contractor, gas company or factory
representative.
7. Changing the gas orifice.
A 9600 HWG tune-up kit is available from your
supplier. It contains a larger (marked +) and
smaller orifice (marked -). If the firing rate is
low, install the larger diameter orifice. Shut off
electricity and gas to the unit. Loosen the gas
orifice union (see Figure 12) and move the lower
half of the union far enough to the side to
remove the orifice. Change orifice. Reassemble,
Figure 10. Electrical hook-up.
GRN
BLK
WH
RED (LOW VOLTAGE) - T
WH/RED (LOW VOLTAGE) - T
GROUND
120 VAC LINE
120 VAC NEUTRAL
SEE
APPLICABLE
WIRING
SCHEMATICS
IN THIS
MANUAL
SWITCH BOX