Quick Reference Installation Guide
For gas delivery to the boiler, we recommend using hard
piping rather than exible piping. If you use exible piping,
ensure that the gas pipe size is appropriate for the maximum
BTU input of the boiler.
Minimum Gas Pressure 4" w.c.
Maximum Gas Pressure 14" w.c.
Size piping for sufcient sustained gas delivery at sufcient
pressure to the boiler.
Recommended Supply Pressure at Full Load
Natural Gas 7"
Propane 10"
• Ensure that there is a minimum of 6 feet of piping
between the boiler and gas regulators.
• Use a manometer to test that gas delivered to the boiler
is delivered at sufcient pressure and that “lock up” does
not exceed the maximum pressure.
• If using a 5 psi to inches vented gas regulator, always
oversize the vent pipe to prevent hunting of the gas
regulator when boilers are ring at lower output levels.
• We strongly recommend against using copper gas lines.
In retrots with existing copper gas pipes, we highly
recommend replacing the pipes with black iron or
stainless steel piping sized correctly for the boiler. If the
copper gas pipes must remain, clean and clear the gas
piping of any debris before connecting to the boiler.
Failure to do so can result in a blocked gas valve. and
inconsistent performance.
Maximum Pipe
Length by Model
½" IPS ¾" IPS 1" IPS 1¼" IPS
VX 110 (Natural Gas) 30' 125' 400' 1,600’
VX 110 (Propane) 90' 350' 1,000' 2,000’
VX 150 (Natural Gas) 20’ 80’ 200' 900’
VX 150 (Propane) 50' 200' 600' 2,000’
VX 199 (Natural Gas) 10' 40' 150' 900'
VX 199 (Propane) 30' 125' 400' 1,400'
1. Place the vacuum breaker cap over the vacuum
breaker opening and push rmly
2. Fill the condensate trap with water.
3. Attach the trap to the drain hose, and tighten the
drain compression (including washer)
4. Slide the trap over the boiler drain outlet, and tighten
upper union nut. Secure the upper union nut with the
outlet clip.
5. Check for leaks.
Gas Supply (Section 3.12)
Boiler Mounting (Section 3.4 of the manual)
Venting (Sections 3.5 and 3.7)
Follow the venting specications for the correct materials and
venting lengths provided in the above sections of the manual.
• Ensure that sidewall congurations have adequate vertical
separation, and that exhaust plumes are well away from all
building air intake vents.
• Ensure that all venting material is sloped towards the boiler.
PP venting must be sloped at a minimum of ⅝″ per foot to
ensure that no leaks occur via gaskets.
• Ensure that PPs venting is supported every 36″ (min).
• On longer horizontal runs of PVC and CPVC, increase the
grade to ⅜″ or more.
• Fully insert approved venting material into the boiler’s
exhaust outlet. Then, tighten the clamp to lock the venting
in place. For PPs venting,
a transition adapter is not
required.
• Check that the venting is
securely attached to the
exhaust ue of the boiler by
pulling on the venting.
Important: To protect against wind loads, terminate
exhaust venting as shown or use the appropriate direct
vent kit.
Condensate Trap (Section 3.9)
LWCO Errors
To clear LWCO errors caused by air:
1. Ensure that there is no air trapped in the boiler and
boiler piping.
2. On the touchscreen controller Status Menu, go to
Clear Errors > Yes
1. Ensure that the boiler’s mounting bracket is securely
bolted to the wall structure.
2. Fasten the bottom of the boiler to the wall.
120-368 - Quick Reference Installation Guide - VX series
Important: Before turning off the boiler, make
sure it is in “Standby” mode.
Important: Not applicable for construction
heating. Parts such as fans, burners, and ignitors
fouled by construction are not covered under
warranty.
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