Voyager 2 Modulating Gas Manifold Pressure
Quick Answer -
A. If the ambient temperature is greater than 60 Fº adjust the gas pressure to +0.050” I.W.C.
B. If the ambient temperature is less than 60 Fº adjust the gas pressure to +0.065” I.W.C.
Required Tools
• Voltmeter
• Manometer capable of measuring in .001" I.W.C. increments, typical digital meters can not read
accurately this low
• Snap ring pliers
• Jumper wire
• Temperature gauge
Steps:
1. Using the snap ring pliers remove the tamper-resistant cap from the gas valve to gain access
to the gas pressure adjustment screw.
2. Attach the liquid manometer gauge to the manifold (outlet) port of the gas valve.
Note: It is not recommended to perform this adjustment with a digital manometer. A digital
manometer will not read accurately at 0.001" I.W.C. increments.
3. Power the unit up and place the unit in the 2nd stage heating sequence by utilizing the Test
Mode function.
4. Allow the unit to settle out by allowing it to run at the high fire for 10-15 minutes before attempting
any adjustments. Verify that the unit is running at high fire, by measuring the voltage between J5-1 and
J5-2 on the RTOM board. Voltage should read approximately 10.5 VDC.
5. Gas pressures should be adjusted as follows:
A. If the ambient temperature is greater than 60 Fº adjust the gas pressure to +0.050” I.W.C.
B. If the ambient temperature is less than 60 Fº adjust the gas pressure to +0.065” I.W.C.
Note: Turn the adjustment screw CCW to decrease the manifold gas pressure and CW to increase the
gas pressure. On Voyager III units with two heat exchangers adjust only the gas pressure
of the heat exchanger with modulating gas controls.
6. Remove the unit from the test mode by shorting Test 1 and Test 2 for three seconds one time
or by cycling power to the unit. LED2 on the RTRM module should now be solid green.
7. Adjust unit controls to bring on a normal call for heat from the thermostat, zone sensor, or BAS. If
no issue exists re-install the tamper-resistant cap.
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.