51
Preparation
Check Power Supply
With multi-meter at incoming power, check voltage
between:
Hot - Common (≈120 VAC)
Hot - Ground (≈120 VAC)
Common - Ground (< 1 VAC)
WARNING:
If Common - Ground is > 1 VAC,
STOP: Contact electrician to correct ground failure.
Failure to do this may burn out 120V-24V
transformer, or may cause other safety control
damage or failure.
Fig. 54: Gas Pressure Measurement Locations
Attach Manometers to Measure Pressures
1. Turn off main gas shutoff valve.
2. Attach a 24” scale manometer to the supply pres-
sure test port on the gas valve to the heater (see
Fig. 54).
3. Attach a 12” scale manometer to the offset pres-
sure testport for Models 88AR-108AR. For Models
198AR-398A attach manometer to manifold pres-
sure tap (see Fig. 54).
Check Gas Supply Pressure
1. Slowly turn on main gas shut-off valve.
2. Read the gas supply pressure from the manome-
ter; minimum supply pressure for natural gas is 4.5
in. WC, recommended supply is 7.0 in. WC, mini-
mum supply pressure for propane gas is 8.0 in.
WC, recommended supply is 11.0 in. WC (dynam-
ic readings, full fire input).
3. If the gas pressure is greater than 14.0 in. WC,
turn off the main gas shut-off valve.
WARNING:
Do not turn on gas at this time.
NOTE:
While attaching manometers, any cap or
bleedle valves removed should be retained for
reinstallation later.
Summary of Contents for 88AR-398A
Page 18: ...18 Fig 13 MODE 1 Single Boiler Primary Secondary Piping...
Page 19: ...19 Fig 14 MODE 2 Single Boiler Primary Secondary Piping with Indirect DHW on System Loop...
Page 20: ...20 Fig 15 MODE 3 Single Boiler Primary Secondary Piping with Indirect DHW on Boiler Loop...
Page 47: ...47 WIRING DIAGRAM Fig 46 Wiring Diagram...
Page 54: ...54 Fig 55 Boiler Lighting Shut Off Instructions...
Page 65: ...65 ILLUSTRATED PARTS LIST...
Page 66: ...66...
Page 67: ...67...
