38
Series 49
Installation, Operating & Service Instructions
111368-04 - 1/22
CSD-1 Configuration
(49-450S - 49-550S CSD-1)
1. Follow steps 1 through 24 in Standard
Configuration section.
2. Check manual reset pressure limit. When
steam pressure is registered on pressure
gauge, lower manual reset pressure limit
setting below gauge pressure. Both pilot and
main burners should stop firing. Raise manual
reset pressure setting to 5 psi. Both pilot and
main burners should remain off. Press PUSH
FOR RESET button on manual reset pressure
limit. Pilot and main burner should relight.
3. Check manual reset LWCO. Press TEST
button on control. Both pilot and main burners
should stop firing. Press RESET button on
control. Pilot and main burner should relight.
4. Check combination gas valve shutdown test.
See Figures 9-5 and 9-6.
A. Remove
SPARK
wire from ignition module.
Both pilot and main burners should stop
firing.
B. Ignition module will attempt to relight boiler
after 5 minutes.
C. Replace
SPARK
wire after second
attempt.
D. Both pilot and main burners should not
relight.
E. Press RESET button on "Daughter
Board". See Figures 9-5 and 14-3.
F. Pilot and main burners should relight.
1. Determine total internal gas line volume from
shutoff valve to combination gas valve(s). Add
5 cubic inches for each combination gas valve.
2. Determine test time per Figure 10-7.
3. Turn off gas to boiler.
4. Install pressure tap on combination gas valve
inlet. See Figure 10-6.
5. Attach manometer to pressure tap.
6. Turn gas back on. Run boiler until gas line is
purged of air.
7. Stop boiler and close gas shutoff valve and
pilot shutoff valve.
8. Unplug wiring harness from combination gas
valve.
9. Apply 24 VAC to MV and MV/PV.
10. Record pressure and start test time.
11. After required time has elapsed, record
pressure.
12. Combination gas valve passes when pressure
differential is less than 2 in. wc (0.07 psi).
13. Replace combination gas valve when pressure
differential is greater than 2 in. wc (0.07 psi).
14. Remove 24 VAC from MV and MV/PV.
15. Apply 24 VAC to PV and MV/PV.
16. Repeat steps 10 through 13.
17. Return boiler back to operating configuration.
10
System Start-Up and Checkout
(continued)
Combination Gas Valve Leak Test
Boilers over 400 MBH must have a means to leak
check each valve seat independently per ANSI
Z21.13.
Figure 10-7: Valve Seat Leakage Test Time
WARNING
Do not leave boiler unattended with 24 VAC
applied to combination gas valve MV terminal.
Ensure all wiring is restored to figures in Section
9 Electrical before leaving job site. Failure to
comply could result in severe personal injury,
death, or substantial property damage.
!
