4
Midco
International
Inc.
8471 15
MADE
in the
USA
Part 1 Installation
The supply piping to the burner should branch off from the main line as close to the source as possible
(NATURAL gas meter or PROPANE tank regulator). When branching off from an existing gas line,
do not tap off the bottom of a horizontal section. Use new black pipe and malleable fi ttings free from
cutting and threading burrs or defects.
- Use pipe joint compound resistant to liquid petroleum gases when using either NATURAL or
PROPANE gas. Piping must comply with the local and national codes. If the burner piping must be
rearranged because of space limitations, be sure to carry out the general confi guration shown in
Figure 3.
- A suitable Main Gas Pressure Regulator should be installed as shown in Figures 1 or 2. Choose a
regulator(s) to adjust the available gas pressure to the pressure shown in SPECIFICATIONS, page 2.
CAUTION: The regulated gas pressures must not exceed 14″ W.C. or Main Automatic
Gas Valve and Ignitor Regulator will be damaged. If excessive gas pressure is prevalent, the
regulator must be a tight shut-off type to prevent high pressures from developing during
stand-by.
- For full input, refer too SPECIFICATIONS, page 2, for minimum gas pressure required. For reduced
capacities, refer to Firing Rate Curves, Table 2.
CAUTION: If gas supply pressure is below its specifi ed range during adjustment, an
over-fi re condition could result when pressure returns to normal, particularly if the regulator
adjustment screw is bottomed out. ALWAYS confi rm that at least the minimum rated pressure
is being supplied during regulator adjustments, and NEVER BOTTOM OUT regulator screw.
- When selecting the burner supply piping size per Table 1, the permissible pressure drop must
be based on the pressure available at the inlet to the supply pipe branch line when all other gas
equipment fed by the same source (NATURAL gas meter or PROPANE tank regulator) is fi ring at full
rate. Also take into account any other INCINOMITE burners to be attached to the same branch line.
- When pressure testing the supply piping, the burner valve train must be protected. If the test pressure
is 0.5 PSIG or less, closing the Main Manual Shut-Off Valve will suffi ce.
CAUTION: If the test pressure is over 0.5 PSIG, the test must be made without any
burner components connected, including Main Manual Shut-Off Valves.
WARNING: EXPLOSION HAZARD. DO NOT USE OXYGEN FOR PRESSURE TESTING.
AN EXPLOSION COULD OCCUR DURING INITIAL START-UP.
NPT
TYPE APPROXIMATE CAPACITY-MBH
PIPE
OF
LENGTH OF PIPE / FEET
SIZE
GAS
10
20
40
60
100
3/4″
Natural 275
200
130
100
---
Propane 450
300
200
165
125
1″
Natural 520
350
245
195
150
Propane 800
550
385
300
235
1 1/4″
Natural 800
730
500
400
300
Propane ---
800
790
630
480
1 1/2″
Natural ---
800
760
610
460
Propane ---
---
800
800
725
2″
Natural ---
---
800
800
800
Propane ---
---
---
---
800
__________________________________________
Installation wiring to the burner must conform to local codes, or, in their absence in the United States
the National Electric Code ANSI/NFPA No. 70- latest edition; in Canada, to CSA standard C22.1,
“Canadian Electrical Code Part 1.”
- Use copper wires and provide disconnect and fuse protection for each INCINOMITE installation.
Refer to SPECIFICATIONS, page 2, for ampacity. Confi rm that the polarity is correct—hot wire to
strip terminal
L1
, neutral
L2
and that the neutral line is not subject to induced low voltage (check
L2
to ground) from other equipment as that can aff ect the electronic control, causing it to malfunction.
- The frame of the burner should be well grounded. A terminal is provided in the control box for positive
grounding.
CAUTION: In order for the automatic cooling system to function, power must be
maintained to burner strip terminal L1. Do not install any safety or on-off controls in the circuit
between the fused disconnect switch and strip terminal L1. Optional remote control devices
should be connected in place of, or in addition to, the switch or timer as indicted in Figure 2A
or 2B Wiring Diagram.
__________________________________________
V Piping
Capacities shown are
for total pressure drop
of 0.3
″
W.C. For higher
permissible pressure drops
consult your fuel supplier.
Source:
Gas Engineers
Handbook-1974
Industrial Press Inc. NY, NY
Table 1
Schedule 40 Pipe Capacities in MBH
VI Electrical
