Raypak 504-2004 - Manual (Page 3)

Project Name / Date Division 23 34 36.29 - 3
E. Gas Train
1. The water heater(s) shall have a firing/leak test valve as required.
2. The water heater(s) shall have dual-seated main gas valve.
3. Gas control trains shall have a redundant safety shut-off feature, main gas regulation, shut-off
cock and plugged pressure tapping to meet the requirements of ANSI Z21.10.3/CSA 4.3.
F. Water Heater Control
1. The following safety controls shall be provided:
a. High limit control with manual reset
b. Flow switch, mounted and wired
c. ____PSIG ASME pressure relief valve, piped by the installer to an approved drain
d. Temperature and pressure gauge (shipped loose)
2. The water heater(s) shall be equipped with a PID temperature controller with LCD display that
incorporates an adjustable energy-saving pump control relay and is factory mounted and wired
to improve system efficiency; three water sensors included.
G. Firing Mode: Provide on/off control of the gas input to the water heater.
H. Water Heater Diagnostics
1. Provide external LED panel displaying the following water heater status/faults:
a. Power on – Green
b. Call for heat – Amber
c. Burner firing – Blue
d. Service – Red
2. Provide internal circuit board indicating the following safety faults by LED signal:
a. System enabled
b. Manual reset high limit
c. Auto reset high limit (optional)
d. Low water cut-off (optional)
e. Blocked vent
f. Low gas pressure switch (optional)
g. High gas pressure switch (optional)
h. Air pressure
i. Flow switch
j. Ignition lock-out
3. Provide ignition module indicating the following flash codes by LED signal:
a. 1 flash – low air pressure
b. 2 flashes – flame in the combustion chamber w/o CFH
c. 3 flashes – ignition lock-out (flame failure)
d. 4 flashes – low hot surface igniter current
e. 5 flashes – low 24VAC
f. 6 flashes – internal fault (replace module)
I. Combustion Chamber: The combustion chamber wrapper shall be sealed and encased in
insulation to reduce standby radiation losses, reducing jacket losses and increasing unit efficiency.
J. Cabinet
1. The corrosion resistant galvanized steel jackets shall be finished with a baked-on powder coat,
which is suitable for outdoor installation, applied prior to assembly for complete coverage, and
shall incorporate louvers in the outer panels to divert air past heated surfaces.
2. The water heater(s), if located on a combustible floor, shall not require a separate combustible
floor base.
3. The water heater(s) shall connect both the combustion air and flue products through the back
of the unit.
K. Water Heater Pump - Refer to Equipment Schedule
2.3 WATER HEATER OPERATING CONTROLS
A. The water heater(s) shall feature a mounted and wired digital controller.
B. Water sensor shall be shipped loose for field-installation by installing contractor. Inlet/Outlet
sensors are factory-installed. Tank sensor is loose.