HTP CG N65 Series, Installation, Start-Up, Maintenance, Parts, Warranty

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LP-436 Rev. 5.20.15
15
High altitude orifices MUST BE installed for water heaters
operating above 7,500 feet. Failure to follow this instruction
can result in property damage, personal injury, or death.
A water heater cannot be used only for space heating
applications. When using a water heater for combination
space and potable water heating, the instructions provided in
this manual and the air-handling unit must be respected, with
particular attention paid to the following:
• All piping and components that are used in the system
must be of a nonferrous type suitable for potable
water. This also applies to any sealant used.
• The water heater must not be connected to any system
that has been previously used for non-potable water
heating. This includes piping because existing piping
may have been treated with chemicals for cleaning or
sealing the system in the past.
• If this water heater is to be used for space heating,
make sure all safety codes are respected. Pay special
attention to safety valve pressure and expansion tanks.
• Do not use toxic chemicals to clean the potable water
heating system.
• Where water temperature in excess of 140
o
F (60
o
C) is
required for a space heating application, a mixing valve
must be installed in the potable side of the system. This
will temper the water and reduce the risk of scalding.
• If the incoming water line to the heater is equipped with
a check valve, water meter, or pressure-reducing valve,
an expansion tank must be installed in the system. This
will prevent weeping from the water heater relief valve
and premature failure of the heater due to expansion
of water during the heating cycle.
• Before acquisition of a water heater for space heating,
it is necessary to have the area of intended use sized
by a qualified technician. This will ensure that an
adequate water heating capacity will be available for
both heating and potable water supply, and that the
application will meet all local codes and public utility
requirements.
NOTE: It is good practice to oversize the water heater to
ensure that all of the potential hot water requirements are
available.
test pressure less than ½ psig (3.5 kPa), the gas supply manual
shut-off valve must be closed.
NOTE: The input rating of the appliance is based on installation
and operation at sea level up to elevations of 2,000 ft. Low
NOx models are certified to operate to 2,000 ft in altitude
without adjustment.
G. Combination Space Heating and Potable Water
Heating
Figure 14 - Water Heater and Air Handler
H. Wiring
This water heater uses an external electrical source for power.
It must be electrically grounded in accordance with all local
codes, or, in the absence of local codes, the latest edition of the
National Electrical Code, ANSI/NFPA 70 in the United States, or
CAN/CSA C22.1, Canadian Electrical Code, in Canada. Failure
to properly ground the water heater can result in property
damage, personal injury, or death.
Before lighting your water heater, check that all of the wires
have been installed correctly. See Figure 16. Inspect local wiring
for defects before installing this product. Verify that all wiring
connections are properly secured. If wiring on the product
appears “loose” or damaged when received, immediately call
HTP, Inc. customer service. If instructed to replace any of the
original wiring, use only 18 AWG type or greater wire approved
for 221
o
F (105
o
C).
If you are installing a side wall power vent kit, use the following
instructions to connect the power venter to the water heater.
See Figures 15 and 16.
1. In the electrical box of the water heater, remove the
jumper between positions 3 and 4 on the terminal block.
2. Install the wires from the power venter control board to
the positions on the terminal block in the electrical box of
the water heater.
If the power venter has been bought through a wholesaler, some
settings need to be changed on the control board before putting
the water heater into operation. The voltage needs to be set at
24 Volts. This can be done by moving the red voltage jumper on
the 24V prongs. For detailed instructions on how to adjust the
power vent settings, consult the Owner’s Manual that comes
with the Tjernlund Power Venter.
If the power venter has been bought directly from HTP, the
settings have been factory adjusted to match the specifications
of the water heater. A label will be affixed on the box stating that
it was factory adjusted to HTP commercial gas water heater
specifications.
Settings on the Power Venter
Voltage: 24 Volts
Pre-Purge: 0 sec.
Post-Purge: 2 min.