Burner Piping | Tempest® 4442 Burner
TEMPEST ® GAS BURNER PIPING Piping concept shown accommodates wide turndown requirements (up to 20:1). If less than 3:1 turndown is satisfactory, a simpler system can be used.
M N
D
C
E
B
F
H
G
A
I
L
K
J
V
U
Block 2 Note 7
T
P
O
Block 1 Note 6
Q
R
S
A – Main gas shutoff valve B – Main gas pressure regulator C – Manual reset gas shutoff valve D – Normally open vent valve.
L – Normally closed solenoid gas valve M – 7350-01-A bypass gas regulator
N – 1808-01 gas cock with integral needle valve
O – Combustion air turbo blower P – Manual or motorized air valve Q – 1122 Limiting orifice air valve
E – Gas blocking valve F – Gas shutoff cock
G – 7216 or 7218 Air/gas ratio regulator H – 1807 Limiting orifice gas valve
R – Normally open UV cooling air solenoid valve
S – Needle valve for UV cooling air
I – 4442 Tempest burner J – Bypass gas shutoff cock
T – Air impulse line orifice
U – Motorized 1008-02 adjustable port valve
K – Bypass gas pressure regulator
V – 3-way solenoid air valve
NOTES
An 8878 DIGITECTIVE Triple Function Annunciator identifies electrical or limit switch outage, facilitating trouble-shooting during initial lighting and normal operation. 6. For modulated burner control only, install the equipment shown in Block 1. 7 For bled-impulse burner control, install the equipment shown in Block 2. 8. Either, or both types of control may be used on your system. For modulated control only, delete the items shown in Block 2 ( T and U ). For bled-im- pulse control only, the valve in Block 1 may be either manual or motorized. 1. Items R and S are for UV cooling air. Item R must be closed during the ignition cycle. 2. Low air, low and high gas pressure switches, and furnace door interlocks are not shown, but are usually required and are strongly recommended. If in doubt, consult your insurer. 3. The UV detector may pick up the corona from the spark igniter. If so, there are several ways to resolve this problem. Contact North American for the one best suited to your system. 4. The limiting orifice gas valve ( H ) should be installed as close to the burner as possible. 5. Solenoid ( L ) should be located as close to the burner(s) as possible, to allow the line to fill with gas before the trial for ignition sequence times out (approximately 5 seconds).
Bulletin 4442 Page 11
Made with FlippingBook flipbook maker