Direct Fired Gas Heat Start-Up - Trane Horizon OABD Series Installation, Operation And Maintenance Manual

Direct Fired Gas heat Start-up

1. Confirm unit airflow by measuring and recording the burner
pressure drop. See table below.
Burner Pressure Drop in.
OAT° F
o
5
10
15
20
25
30
35
40
45
50
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.
OA Temp °F
Burner Pressure Drop in. wc
Gas Pressure at PG1
Low Fire ΔT
High Fire ΔT
OAU-SVX007A-EN
wc OAT° F
.720
.712
.705
.697
.690
.683
.676
.669
.663
.656
.650
55
60
65
70
75
80
85
90
95
100
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.
Start-Up Form
Burner Pressure Drop in. wc
.643
.637
.631
.625
.619
.613
.608
.602
.597
.592
125