RT-SVX35H-EN
99
Service & Maintenance
Table 34. Control settings and time delays
Control Description
Elec. Designation
Contacts Open
Contacts Closed
Combustion Airflow Switch
(Gas Heat Only)
4S25
see Note 1
0.1 - 0.25" wc rise in press diff
High Limit Cutout
(Gas Heat Only)
4S26
250 + 15°F
210°F
Supply Airflow Switch
(Gas Heat Only)
4S38
0.03 - 0.12" wc
0.15 + 0.05" wc rise in press diff
Disch High Limit
(Electric Heat Only)
4S27
133 + 5°F
110 + 5°F
Linear High Limit
(Electric Heat Only)
4S33
185 + 10°F (std./cULus)
165 F + 10°F (cULus)
145°F (std./cULus)
125°F (cULus)
Freezestat
(Hydronic Heat Only)
4S12
(N.O.) Auto Reset
40°F
Gas Heat Units
Prepurge Timer:
Fenwall
4DL5
N.C. - timed to close
60 seconds
Honeywell
4U18
internal timing function
60 seconds
Sequencing Time Delay Relay
4DL6
N.C. - timed to close
60 s 20%
Note:
The combustion airflow switch (4S25) differential is 0.02" - 0.08" wc.
Summary of Contents for IntelliPak WEHE Series
Page 15: ...General Information RT SVX35H EN 15 Figure 1 Unit component layout and ship with locations...
Page 17: ...Installation RT SVX35H EN 17 Figure 2 Typical control module location...
Page 44: ...Installation 44 RT SVX35H EN Figure 27 Typical field power wiring for W_HE casings 2 through 6...
Page 56: ...Installation 56 RT SVX35H EN Figure 32 Wiring notes for CV controls...
Page 60: ...Installation 60 RT SVX35H EN Figure 35 Wiring notes VAV...
Page 68: ...System Start up 68 RT SVX35H EN Figure 38 Typical fenwall ignition control system...
Page 69: ...System Start up RT SVX35H EN 69 Figure 39 Typical Fenwall ignition control system...