22
A
A
CAUTION:
Support gas supply piping with hangers,
not by the heater or its accessories. Make sure the gas
piping is protected from physical damage and freezing,
where required.
Gas Supply Pressure
A minimum of 4" WC and a maximum of 10.5" WC gas
pressure is required under load and no-load conditions
for natural gas at the heater. A minimum of 4" WC and a
maximum of 13" WC is required for propane gas at the
heater. The gas pressure regulator(s) supplied on the
heater is for low-pressure service. If upstream pressure
exceeds these values, an intermediate gas pressure
regulator, of the lockup type, must be installed.
When connecting additional gas utilization equipment to
the gas piping system, the existing piping must be checked
to determine if it has adequate capacity for the combined
load.
A
A
CAUTION:
For proper operation, no more than a
30% drop in gas supply pressure from no-load to full-
load conditions is acceptable. Under no circumstances
should the pressure be outside the listed operational
range.
Electrical Power Connections
A
A
WARNING:
Heater is designed to accept several
different supply voltages - changes to wiring in heater
Power Supply Box MAY be required when using other
voltages. See details in "Multiple Voltage Configurations"
on page 23.
A
A
WARNING:
Electrical power connection must be
performed by qualified licensed electrician(s) for the
voltage being applied.
Installations must follow these codes:
• National Electrical Code and any other national,
state, provincial or local codes or regulations having
jurisdiction.
• Safety wiring must be NEC Class 1.
• Heater must be electrically grounded as required by
the NEC.
• In Canada, CSA C22. 1 C.E.C. Part 1.
NOTE:
A 120VAC (.75A Max.) outlet is provided on the
bottom of the Junction Box for general use.
Before starting the heater, check to ensure proper voltage
to the heater.
Pumps (if used) must use a separate power supply and
run the power through a field-supplied contactor. Use
appropriately-sized wire as defined by NEC, CSA and/or
local codes. All primary wiring should be 125% of minimum
rating.
If any of the original wire as supplied with the heater must
be replaced, it must be replaced with 105°C wire or its
equivalent.
All high voltage wiring connections to the XFiire heater
are made inside the rear wiring box as shown in
Figure
24
. There are three factory-supplied interlock relays in the
rear wiring box to provide an enable signal via dry contact
(5A max) for the Heater Pump/Isolation Valve, System
Pump, and Indirect DHW Pump as required for the system
depending on the mode selected within the VERSA IC
system.
Model
No.
Heater Amp Draw
120VAC
208VAC
300B
<7.5 A
<5.0 A
400B
<7.5 A
<5.0 A
500B
<5.0 A
<5.0 A
650B
<5.0 A
<5.0 A
800B
<7.5 A
<7.5 A
100B
<7.5 A
<7.5 A
Table N. Expected Heater Amp Draw
F10614
REAR WIRING BOX
Figure 24. Rear Wiring Box Location
Содержание Xfiire 1000B
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