Schwank bistroSchwank 2-Stage User Manual
Page 19
2100 / IO 100 Manual
IM110107
RD: MAY 2014
R.L. 4A
19
7. GAS SUPPLY PIPING
All piping must be installed according to applicable local and national codes
A listed flexible connector (field supplied) must be installed between the heater and gas
supply piping. For outdoor installation the connector must be in compliance with
ANSI Z21.75 / CSA 6.27. A 1/2” x 24” stainless steel flexible gas connector (JL-0771-XX
- approved Indoor/Outdoor) is available as an option from Schwank / InfraSave.
A drip-pocket must be provided at the inlet connection
Provide a 1/8” NPT plugged tapping, accessible for test gage connection, immediately
upstream of the gas supply connection to the heater.
On propane-fired units, a main line filter is recommended (field supplied)
Piping joint compounds must be resistant to the action of liquefied petroleum gases
All piping joints must be tested for leaks with a soap and water solution.
CAUTION: DO NOT INSTALL ANY GAS PIPING IN HEAT ZONES
The maximum supply pressure must be limited to 14”w.c. (0.5 psi). If the line pressure is
above 14”w.c., then a separate pressure reducing regulator must be installed in the gas
supply. The minimum pressure at the inlet to the heater regulator (gas valve) must be equal to
or greater than 6.0”w.c. for natural gas and 11.0”w.c. for propane gas.
Proper manifold pressure must be adjusted during commissioning, and will be maintained
when the main burner is operating under the following supply pressure:
7.1 GAS PRESSURE
LINE PRESSURE
”w.c.
MANIFOLD PRESSURE
”w.c.
GAS TYPE
MINIMUM
MAXIMUM
AT GAS VALVE TEST PORT
NATURAL GAS
6.0
14.0
5.0
PROPANE GAS
11.0
14.0
10.0
NATURAL GAS (ONLY)
6.0
14.0
5.0 High; 3.0 Low
Table 4
MODELS
2135/50; IO-135/150
2152 / IO-152
(2-Stage)
2135/50; IO-135/150
8. ELECTRICAL REQUIREMENTS - see also Wiring Diagrams pages 31 - 32
All electrical installations must meet local codes and the latest edition ANSI/NFPA N0 70 in
the U.S.A. and Electrical Code PART 1 CSA C22.1 in Canada .
TRANSFORMER SPECIFICATIONS (field supplied)
Single heater requires 24 Volt, 60 Hz electrical transformer sized at 40 VA.
Multiple heaters in a zone are powered by a single transformer (field supplied). The proper
transformer is 24 Volt AC, 60 Hz, sized at 40VA for the first heater plus 20VA for each addi-
tional heater in the zone - round up the calculated value to the next higher available sized
transformer. For example, four heaters in a zone require a transformer of : 1 x 40VA + 3 x 20
VA = 100 VA .
Natural Gas: Orifice sized for 1000 BTU/CU.FT.
Propane Gas: Orifice sized for 2500 BTU/CU.FT.