1.The water heater(s) shall be equipped to (a), (b), or (c):
a.Provide full modulation of gas input to any load condition as low as 20% of the full rating of the water heater (5:1 ratio) without flashback, burning at orifices or improper combustion.
b.Provide staged control of the gas input to the water heater.
c.Provide on/off control of the gas input to the water heater. H. Water Heater Diagnostics
1.Provide ignition module indicating the following heartbeats (flashes) by LED signal: “M” Ignition Model (Continuous Retry)
a.2 flashes per second (“heartbeat”) – Normal operation
b.2 flashes – Five-minute retry delay
c.3 flashes – Recycle; flame failed during run
d.4 flashes – Flame sensed out of sequence
e.7 flashes – Flame sense leakage to ground
f.8 flashes – Low 24VAC (secondary voltage)
g.6+2 flashes –
h.6+3 flashes – On every sixth flame failure during run on the same “Call For Heat”
i.6+4 flashes – Flame sensed out of sequence for more than 10 seconds
j.ON steady – Soft lockout due to error detected during
“H” Ignition Model (Lockout)
k.2 flashes per second (“heartbeat”) – Normal operation
l.2 flashes –
m.3 flashes – Recycle; flame failed during run
n.4 flashes – Flame sensed out of sequence
o.7 flashes – Flame sense leakage to ground
p.8 flashes – Low 24VAC (secondary voltage)
q.6+2 flashes – Failed trial for ignition resulting in lockout
r.6+3 flashes – More than five flame failures during run on the same “Call For Heat” resulting in lockout
s.6+4 flashes – Flame sensed out of sequence for more than 10 seconds
t.ON steady – Soft lockout due to error detected during self check sequences
I.Combustion Chamber: The
J.Venting
1.When routed vertically, the water heater’s flue material and size shall be in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA54 latest edition (Category I).
K.Cabinet
1.The
2.The water heater(s), if located on a combustible floor, shall require an optional separate combustible floor base.
L.Operating Controls
1.The water heater(s) shall feature an optional temperature controller.
Specifier Note: The remaining items in this section are options. Delete those that are not being specified. IMPORTANT: The Cold Water Start and Cold Water Run Systems cannot be used on the same water heater.
M.Water Heater Pump - Refer to Equipment Schedule
N.Cold Water Start System
1.The water heater(s) shall be configured with a cold water start automatic proportional bypass system that ensures the water heater will experience inlet temperatures in excess of 105ºF within 7 minutes to avoid damaging condensation. The unit will automatically shut down if the
Project Name / Date | Division 23 52 33.13 - 3 |