Start-Up Form
OAU-SVX007A-EN 125
Direct Fired Gas heat Start-up
1. Confirm unit airflow by measuring and recording the burner
pressure drop. See table below.
2. Check inlet gas pressure and confirm gas flow to unit.
3. Test operating heating modes and record ΔT at
a. Low Fire
i. Start unit supply fan only and set heat capacity to 0%
ii. Confirm 10° temp rise on Discharge temp
iii. If ΔT < or >10°-12°, manually adjust ball valve
attached to Belimo actuator until desired ΔT
achieved.
b. High Fire
i. Set heat capacity to 100%
ii. Confirm 100° temp rise on Discharge temp
iii. If ΔT < or >100°, manually adjust ball valve attached
to Belimo actuator until desired ΔT achieved.
OAT° F
Burner Pressure Drop in.
wc OAT° F Burner Pressure Drop in. wc
o .720 55 .643
5 .712 60 .637
10 .705 65 .631
15 .697 70 .625
20 .690 75 .619
25 .683 80 .613
30 .676 85 .608
35 .669 90 .602
40 .663 95 .597
45 .656 100 .592
50 .650
OA Temp °F
Burner Pressure Drop in. wc
Gas Pressure at PG1
Low Fire ΔT
High Fire ΔT
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