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Initial Start-up
Required tools
•(1)
•(2)
•Screwdrivers (assorted sizes and shapes)
•(1) Crescent wrench (8” or 10”)
•(1)
•(1) Amp probe
(Metric Allen wrenches will be required for servicing the gas valve, but not during
NOTE: Digital manometers are not recommended.
Preparation
WARNING: Do not turn on gas at this time.
Check Power Supply
With
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
Attach Manometers to Measure Pressures
1.Turn off main gas valve.
2.Attach (1) 12” scale manometer to an upstream bleedle valve on the gas supply pipe to the heater (Measure point “A” in Fig. 52).
3.Attach (1) 24” scale manometer to the manifold pressure tap located on the elbow downstream of the valve (Measure point “D” in Fig. 52).
4.Attach (1) 12” scale manometer near the
|
| TO BURNER |
GAS | A | B |
CD
Fig. 52: Gas Pressure Measurement Locations
Check Gas Supply Pressure
1.Slowly turn on main gas
2.Read the gas supply pressure from the manome- ter; minimum supply pressure for natural gas is 4.0 in. WC, recommended supply is 7.0 in. WC, mini- mum supply pressure for propane gas is 4.0 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
Start-Up
NOTE: The values in Tables V, W and X represent the conditions when the heater is at full firing rate at sea level.
1.Turn power on.
2.Turn on the heater, wait approximately 15 seconds after the blower starts, and the igniter should start to glow (observable through the observation port located at the front, bottom of the heater). Look into the sight glass located at the bottom of the front panel to check igniter operation. Gas valve should open in
3.The heater ignites at 50% of full rate (as indicated on the LCD display of the temperature control located in the upper right of the front panel).
4.If the burner fails to light on the first trial, it will go into lockout with the optional
5.Wait until the controller indicates 100% on the fir- ing rate display screen (approximately 30 seconds).
45