Start-up
1. A pressure tap is used to measure the differential at the burner and to set high fire gas pressure (See Manifold Pressure
Adjustment on Page 17-18). The manifold pressure tap is 1/8” and located between modulating valve and the burner(s).
2. Close the inlet manual shut off valve and open the manual shut off located between the modulating valve and the burner.
Turn the circulating blower on to full operating CFM and record the negative pressure on a u-tube manometer or gas
pressure gauge. This reading is used for high fire burner pressure adjustment during operation.
3. After recording the negative burner manifold pressure, temporarily leave the manometer attached to the 1/8"tap. It will be
used later to check high fire gas pressure. Close the manual shut off valve located between the modulating valve and the
burner.
4. Open the inlet manual shut off valve. Verify supply inlet pressure does not exceed maximum rated gas pressure as
stated on the rating plate. See Figure 8 for measuring location.
5. Set the supply gas pressure at the stepdown regulator (normally outside of the enclosure if one is installed),
according to the nameplate rating inlet gas pressure specifications.
6. Before proceeding, check Start-up wiring changes for the corresponding installed heater control (Step 12). Make
necessary wiring changes only when the module is powered OFF.
Only perform Steps 7 - 10 if a pilot is installed.
7. Place a u-tube manometer or gas pressure gauge on the tee at the downstream side of the pilot pressure regulator. Open
the inlet manual gas valve and close the manual gas valve downstream of the modulating valve.
8. Supply correct source voltage to heater control. Give a call for heat (close contacts between T1 and T2), Once
flame safeguard lights the pilot, adjust the differential pilot pressure regulator to 3.5 in w.c. for natural gas or 2.0 in w.c. for
LPG.
9. Verify that the burner flame control has a flame signal of 2-5 UA or 2-5 VDC.
10. Remove the call for heat (open contacts between T1 and T2), and open the manual gas valve downstream of the
modulating valve.
11. Give a call for heat (close contacts between T1 and T2). Allow flame safeguard to ignite the pilot (if installed), open
main gas valve(s), and prove the main flame.
12. Depending on which Burner Control is installed follow subsequent steps for each controller type to check full input
range of the gas modulation.
CA: Provide 10 VDC to terminals 5 & 6 on the SC11 (See Figure 10A) signal conditioner control. Polarity is sensitive
(Positive to Terminal 6, Negative to Terminal 5). After a 15 second warm up period the unit will run at high fire. Check
that manifold pressure is manifold pressure recorded on Ratings Label. If high fire manifold pressure adjustment is needed
(See Manifold Pressure Adjustment) and a MR212 modulating valve is installed, see Figure 11 for adjustment location.
If a M 411, 511, 611 modulating valve is installed, adjust high fire manifold pressure by adjusting the combination
gas valve (See Figure 13 or 14), or the Regulator Valve upstream of main gas valve(s).
Provide 0 VDC to terminals 5 & 6 on the SC11 signal conditioner control. Heat module will run at low fire. Manifold
pressure will be negative. Check to make sure that there is not a loss of flame. If manifold pressure
adjustment is needed see Figure 11 or 12 for low fire bypass adjustment location. View flame through viewport
to ensure there is a steady even flame across the full length of the throat of the burner (See Figure 17).
DA / DI / DR: If using a remote Temperature selector Remove the wire lead from terminal 4 on the Maxitrol A1014R controller
to run unit at full high fire. Check that manifold pressure correlates to the differential manifold pressure recorded on Ratings
Label. If high fire manifold pressure adjustment is needed (See Manifold Pressure Adjustment) and a MR212 Modulating
valve is installed, see Figure 11 for adjustment pot location. If a M 411, 511, 611 Modulating valve is installed, adjust high
fire manifold pressure by adjusting the Regulator Valve upstream of on/off valves, or the combination gas valve (See Figure
13 or 14).
Remove the wire lead from terminal 6 on the Maxitrol A1014R controller to run unit at low fire. The manifold pressure will be
negative. Check to make sure that there is not a loss of flame. If manifold pressure adjustment is needed
see Figure 11 & 12 for low fire bypass adjustment location. View flame through viewport to ensure there is a
steady even flame across the full length of the throat of the burner (See Figure 17).
After checking both high and low fire, power down module, correct dip switch setting if needed, replace remote
temperature selector if needed, and select correct temperature setting either using onboard pot or remote selector.
